**Date/App#** |
**List of recent Fast Fourier Transform-related patents** |

04/17/14 20140105146 | **Method of transmitting reference signal in wireless communication system** A method of transmitting a reference signal in a wireless communication system includes generating a frequency-domain reference signal by performing discrete fourier transform (dft) on a time-domain reference signal, generating a transmit signal by performing inverse fast fourier transform (ifft) on the frequency-domain reference signal and transmitting the transmit signal.. . |

04/10/14 20140101409 | **3d memory based address generator** Systems and methods are disclosed for reducing memory usage and increasing the throughput in variable-size fast fourier transform (fft) architectures. In particular, 3d symmetric virtual memory is disclosed to exploit the structure inherent in variable-size fft computations. |

03/27/14 20140089368 | **Device with capability of processing fft radix 2 butterfly operation and operation method thereof** The disclosure provides a device with a capability of processing a fast fourier transform algorithm (fft) radix 2 butterfly operation and an operation method thereof, the device at least includes a latch, a complex multiplier, a complex adder-subtractor, a switch and a complex conjugate arithmetic logical unit (alu). The complex operation unit of the disclosure has a simple structure. |

03/27/14 20140089367 | **Techniques for improving the efficiency of mixed radix fast fourier transform** Techniques for implementing mixed-radix fft on simd vector processors efficiently for the latest standard in wireless communication technology by dynamically reordering stages are provided. In one aspect, a mixed-radix fft implementation method for vector processors is provided which includes the following steps. |

03/27/14 20140089366 | **Techniques for improving the efficiency of mixed radix fast fourier transform** Techniques for implementing mixed-radix fft on simd vector processors efficiently for the latest standard in wireless communication technology by dynamically reordering stages are provided. In one aspect, a mixed-radix fft implementation method for vector processors is provided which includes the following steps. |

03/20/14 20140082039 | **Interleaved method for parallel implementation of the fast fourier transform** The present invention generally relates to a method for computing a fast fourier transform (fft). In one embodiment, the present invention relates to an interleaved method for computing a fast fourier transform (fft).. |

03/13/14 20140075081 | **Methods and apparatus for providing bit-reversal and multicast functions utilizing dma controller** Techniques for providing improved data distribution to and collection from multiple memories are described. Such memories are often associated with and local to processing elements (pes) within an array processor. |

03/13/14 20140074410 | **Detection and measurement of defect size and shape using ultrasonic fourier-transformed waveforms** A system may include a data analysis device that is configured to receive from an ultrasonic waveform detector ultrasonic waveform data representative of an ultrasonic waveform that propagated through a sample and resonated within a defect within the sample. The data analysis device may be further configured to select a portion of the ultrasonic waveform data, apply a fast fourier transform to the portion of the ultrasonic waveform data to transform the portion from a time domain to a frequency domain, identify a characteristic frequency of the portion in the frequency domain, and determine a characteristic of the defect based on the characteristic frequency of the portion. |

03/13/14 20140072156 | **Hearing aid system for removing feedback noise and control method thereof** Provided is a hearing aid system including: a first processor that fast fourier transforms n input signal tone data output from an input buffer memory, and then executes nonlinear compression; a second processor that inverse fast fourier transforms amplitude spectrum data; an output buffer memory that stores the voice signal tone data, until the number of the voice signal tone data is n; and a digital-to-analog (d/a) converter that converts the digital voice signal tone data into an analog signal, to then output the analog signal to a receiver. Thus, certain ambient noise due to an acoustic feedback signal and a narrow frequency band that occur in a hearing aid is removed, to thus reduce discomforts due to the acoustic feedback noise of the hearing aid for hearing aid users, and to thereby significantly improve speech discrimination.. |

03/13/14 20140070538 | **Method and apparatus for protecting wind turbines from extreme events** A wind turbine has a scanning lidar arranged on the nacelle. The lidar has a single scanning beam which scans about a substantially vertical axis to sense wind related data in a measurement volume a predetermined distance from the lidar. |

03/06/14 20140064223 | **Method for signaling information by modifying modulation constellations** Methods and systems for communicating in a wireless network may distinguish different types of packet structures by modifying the phase of a modulation constellation, such as a binary phase shift keying (bpsk) constellation, in a signal field. Receiving devices may identify the type of packet structure associated with a transmission or whether the signal field is present by the phase of the modulation constellation used for mapping for the signal field. |

03/06/14 20140062779 | **Fast transform based offset determination** An offset estimator (e.g., a time delay, a spatial image offset, etc.) makes use of a transform approach (e.g., using fast fourier transforms). The sparse nature of a cross-correlation is exploited by limiting the computation required in either or both of the forward and inverse transforms. |

02/20/14 20140050257 | **Ofdm speed estimation** Techniques are provided for deriving speed estimates by performing a convolution of the output of the fast fourier transform (fft) stage from different time windows in an orthogonal frequency-division multiplexing (ofdm) modulation scheme. Such techniques enable speed estimation to be performed in the frequency domain, requiring little or no modification to existing ofdm systems.. |

02/13/14 20140042426 | **Light extraction transparent substrate for organic el element, and organic el element using the same** A light extraction transparent substrate for an organic el element includes a transparent supporting substrate; a diffraction grating having a first concavity and convexity layer having first concavities and convexities formed on a surface thereof, which is located on a surface of the transparent supporting substrate, and a microlens having a second concavity and convexity layer having second concavities and convexities formed on a surface thereof, which is located on a surface of the transparent supporting substrate. When a fourier-transformed image is obtained by performing two-dimensional fast fourier transform processing on a concavity and convexity analysis image obtained by analyzing the shape of each of the first and second concavities and convexities by use of an atomic force microscope, the fourier-transformed image shows a circular or annular pattern substantially centered at an origin at which an absolute value of wavenumber is 0 μm−1.. |

02/06/14 20140036655 | **Mimo beamforming-based single carrier frequency division multiple access system** A multiple-input multiple-output (mimo) beamforming-based single carrier frequency division multiple access (sc-fdma) system is disclosed. At the transmitter, a fast fourier transform (fft) is performed on transmission data to generate frequency domain data. |

02/06/14 20140036631 | **Active sonar apparatus, active sonar signal processing method, and recording medium storing signal processing program thereof** An active sonar apparatus which emits a sound wave and detects a target object based on a sound reflected by this target object including an fft part which performs the fast fourier transform of the received sound wave to derive a frequency spectrum and outputs this as an fft signal, a normalization part which normalizes the fft signal and outputs this signal as a normalized signal, and a noise elimination unit which performs a plurality of smoothing processes to the normalized signal, combines the signals to which the smoothing processes are performed to generate a combined signal, and outputs the combined signal in which a noise received together with the reflected sound is suppressed.. . |

01/30/14 20140029700 | **Multi-tap iq imbalance estimation and correction circuit and method** A system (55-1) for correcting gain imbalance and phase imbalance between first (iout) and second (qout) signals which are 90° out of phase, including circuitry (32) for estimating the phase mismatch (φ) and gain mismatch (Δ) between the first signal and the second signal signals in a plurality of frequency bands. An inverse fast fourier transform is performed on each of a number of arrays of the phase mismatch estimates and the gain mismatch estimates to generate correction filter coefficients (h[n]) for a n tap correction filter (61). |

01/30/14 20140029590 | **Apparatus and method for generating synchronization channel in a wireless communication system** A synchronization channel (sch) transmission method includes generating a primary sch (p-sch) sequence according to supplementary information. The supplementary information includes at least one of base station (bs) type information, fast fourier transform (fft) size information, bandwidth (bw) information, group information, sector information, and carrier type information. |

01/23/14 20140023162 | **Method and system for an ofdm joint training and frequency tracking system** Aspects of a method and system for an ofdm joint timing and frequency tracking system may include tracking carrier frequency and symbol timing in an orthogonal frequency division multiplexing (ofdm) signal based on at least a reference symbol set. A receiver frequency and timing may be adjusted based on the tracked carrier frequency and symbol timing. |

01/23/14 20140022959 | **Transmitter, receiver and method for estimating variable frame structure using preamble signals** A transmitter for estimating a variable frame structure using preamble signals is provided, and the transmitter includes a subcarrier location modulator configured to modulate locations of subcarriers into predetermined locations based on information about a variable frame structure in an attempt to transmit preamble signals; and an inverse fast fourier transform (ifft) unit configured to perform ifft on the preambles carried on the subcarriers of which locations are modulated and wirelessly transmit the preamble signals on which ifft has been performed.. . |

01/16/14 20140016680 | **Multi-user detection using equalization and successive interference cancellation** A method and apparatus for multi-user detection is disclosed. A signal is received in a shared spectrum, and samples of the received signals are produced as a received vector. |

01/09/14 20140010066 | **Combined echo and crosstalk cancellation** Combined echo and crosstalk cancellation is provided. Frequency domain adaptive filters are used to remove or reduce the effects of echo and crosstalk for a multi-channel and full-duplex communications system. |

12/26/13 20130345992 | **Method of determining the breaking stress in shear of a part of determined thickness** A method of determining the breaking stress in shear for a part of determined thickness and made up of two elements that are bonded together by a layer of adhesive. A plane sensor emits an ultrasound wave at the part of determined thickness. |

12/26/13 20130343371 | **Communication device and communication method** A modulator performs a predetermined operation for making an absolute value of an operation result of at least one element of an input signal greater than 0 on the individual elements of the input signal. The modulator generates post-operation data by associating individual elements of the input signal with individual elements of a data series which is a set of pieces of data which are equal in number to the elements of the input signal and whose absolute values are equal to one another, and multiplying the individual elements of the input signal which are subjected to the predetermined operation by the elements of the data series. |

12/19/13 20130338539 | **Software program for monitoring a hand tremor of an end-user via a computer mouse input device** A computer receives movement information, wherein the movement information is sent by a computer mouse input device in response to an end-user moving the computer mouse input device. The computer determines a frequency at which an end-user typically tremors based on the movement information received during a specified time interval, by utilizing a fast fourier transform operation. |

12/12/13 20130332498 | **Method and apparatus for efficient frequency-domain implementation of time-varying filters** Embodiments are directed to efficient frequency-domain implementations of time-varying fir filters. More specifically, time-varying fir filters according to embodiments exploit the duality of the fast fourier transform that windowing in the time domain equals convolution in the frequency domain. |

12/05/13 20130322576 | **Accelerated carrier acquisition method for a digital communication receiver** A method of accelerated carrier signal acquisition for a digital communication receiver, the method comprising receiving a carrier signal by a receiver comprising a carrier recovery loop (crl), setting the crl to an open loop setting using a processor. Setting a numerically controlled oscillator (nco) within the crl at a center frequency of the nco, determining, by the processor, one or more initial parameters of the crl, calculating an estimate and polarity for a sign frequency detection frequency using a sign frequency detector while simultaneously estimating a fast fourier transform (fft) frequency by running an fft using the processor, comparing polarities of the estimates of the sign frequency detection frequency and fft frequency and determining a frequency offset using the processor, and adjusting one or more parameters of the crl based on the frequency offset using the processor.. |

12/05/13 20130322575 | **Method and user equipment for carrier aggregation** User equipment is provided for receiving an ofdm signal. The user equipment includes a plurality of carrier processing chains and a carrier aggregation module, aggregating the signals received on each carrier processed by the plurality of carrier processing chains. |

12/05/13 20130322508 | **Antenna selection technique for fast diversity** A fast diversity technique using either an eesm or a capacity computation can determine antenna selection in a wireless communication device. A fast fourier transform (fft) for the eesm/capacity computation can be performed with consecutive samples of a single symbol period of a short training field (stf) of a packet received by each antenna. |

11/28/13 20130316665 | **Method and apparatus for coding and interleaving for very high throughput wireless communications** A wireless transmitter can include a plurality of bandwidth modules, each bandwidth module processing data based on a predetermined frequency band. In one embodiment, such a wireless transmitter can include encoding components for receiving transmit data and generating encoded data. |

11/21/13 20130307562 | **Systems and methods for fft-based microwave distance sensing for a plumbing fixture** Systems and methods for detecting a position of an object relative to a plumbing fixture are provided. A described method includes emitting a microwave detection signal toward a moving object, receiving an echo-wave signal reflected from the moving object, and superimposing the microwave detection signal and the echo-wave signal to produce a superimposed time domain signal. |

11/21/13 20130307487 | **Cell temperature and degradation measurement in lithium ion battery systems using cell voltage and pack current measurement and the relation of cell impedance to temperature based on signal given by the power inverter** A method and system for determining the temperature of cells in a battery pack, without using temperature sensors, by measuring the impedance of the cells and using the impedance to determine the temperature. An ac voltage signal is applied to the battery pack, and a time sample of voltage and current data is obtained. |

11/14/13 20130304784 | **Signal processing method and device** A data processing method is disclosed, including: twiddling input data, so as to obtain twiddled data; pre-rotating the twiddled data by using a symmetric rotate factor, where the rotate factor is a·w4l2p+1, p=0, . . |

11/14/13 20130304463 | **Noise cancellation method** An embodiment of the invention provides a noise cancellation method for an electronic device. The method comprises: receiving an audio signal; applying a fast fourier transform operation on the audio signal to generate a sound spectrum; acquiring a first spectrum corresponding to a noise and a second spectrum corresponding to a human voice signal from the sound spectrum; estimating a center frequency according to the first spectrum and the second spectrum; and applying a high pass filtering operation to the sound spectrum according to the center frequency.. |

11/14/13 20130301556 | **Multi-channel support within single user, multiple user, multiple access, and/or mimo wireless communications** Multi-channel support within single user, multiple user, multiple access, and/or mimo wireless communications. A processor of the communication device is implemented to process a signal to generate processed signals. |

11/14/13 20130301555 | **Multi-channel support within single user, multiple user, multiple access, and/or mimo wireless communications** Multi-channel support within single user, multiple user, multiple access, and/or mimo wireless communications. A communication device is implemented to encode information bit(s) to encoded bits, which subsequently can undergo processing by an interleaver that is implemented to generate interleaved bits. |

11/07/13 20130294641 | **Multiple transform utilization and application for secure digital watermarking** Multiple transform utilization and applications for secure digital watermarking in one embodiment of the present invention, digital blocks in digital information to be protected are transformed into the frequency domain using a fast fourier transform. A plurality of frequencies and associated amplitudes are identified for each of the transformed digital blocks and a subset of the identified amplitudes is selected for each of the digital blocks using a primary mask from a key. |

10/31/13 20130290807 | **Method for signaling inforamtion by modifying modulation constellations** Methods and systems for communicating in a wireless network may distinguish different types of packet structures by modifying the phase of a modulation constellation, such as a binary phase shift keying (bpsk) constellation, in a signal field. Receiving devices may identify the type of packet structure associated with a transmission or whether the signal field is present by the phase of the modulation constellation used for mapping for the signal field. |

10/24/13 20130279637 | **Method and system for a reference signal (rs) timing loop for ofdm symbol synchronization and tracking** Aspects of a method and system for a reference signal (rs) timing loop for ofdm symbol synchronization and tracking may include tracking symbol timing in an orthogonal frequency division multiplexing (ofdm) signal based on at least a reference symbol set. A receiver timing may be adjusted based on at least the symbol timing. |

10/24/13 20130279632 | **Method of modulating signal for data communication and device therof** The present invention relates to a method for modulating a signal, which is a signal modulation method for data communication, and the method comprises the steps of: forming a data symbol sequence to which a symbol 0 having the overall length of n are added, by adding m−1 symbols 0 to each symbol of a data symbol sequence; performing an n-point fast fourier transform for the data symbol sequence to which said symbols 0 are added; performing precoding for said fast-fourier-transformed data symbol sequence; and forming a final transmission symbol sequence by performing an inverse fast fourier transform for said precoded data symbol sequence. Further, the present invention relates to a transmitter which comprises: a symbol adding unit that forms a data symbol sequence to which the symbol 0 having the overall length of n is added, by adding m−1 symbols 0 to each symbol of a data symbol sequence; a fast fourier transform unit that performs an n-point fast fourier transform for the data symbol sequence to which said symbols 0 are added; a precoding unit that performs precoding for said fast-fourier-transformed data symbol sequence; and an inverse fast fourier transform unit that forms a final transmission symbol sequence by performing an inverse fast fourier transform for said precoded data symbol sequence.. |

10/24/13 20130279625 | **Communication device and communication method** The modulator creates modulated signals from input signals. The series/parallel converter creates subcarrier modulated signals from the remaining data and modulated signals. |

10/24/13 20130279452 | **Frequency domain transmission method and apparatus** Embodiments of the present invention disclose a central baseband processing unit (cbpu), including a switching module and at least one base band unit (bbu) and further including a resource mapping module. The resource mapping module is configured to perform resource block demapping for uplink frequency domain baseband signals obtained through fast fourier transform (fft) and demultiplex signals of each user from corresponding subcarriers. |

10/24/13 20130279293 | **Vectorization of fast fourier transform for elastic wave propogation for use in seismic underwater exploration of geographical areas of interest** Numerical simulations of elastic wave propagation algorithms are critical components for seismic imaging and inversion. Finite-difference schemes yield good efficiency but cannot ensure the accuracy of the high frequency component. |

10/17/13 20130272627 | **Methods and systems for processing a first image with reference to a second image** An image registration method is disclosed for processing a distorted image into a registered image that is aligned with reference to an original image. Distortions from the original image may include scaling, rotation, and noise. |

10/10/13 20130266308 | **Coherent optical receiver, device and method for detecting inter-lane skew in coherent optical receiver** The disclosed coherent optical receiver includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; a skew addition unit; and a fft operation unit. The 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs multiple optical signals separated into a plurality of signal components. |

10/10/13 20130265864 | **Efficient bandwidth utilization methods for catv docsis channels and other applications** Methods to improve the data carrying capacity of catv docsis systems and other communications systems are disclosed. Communications channels may be more efficiently spaced with reduced or absent guard bands by using receivers with adaptive signal cancellation methods, equalizing circuits, or polyphase filter banks and fast fourier transform signal processing methods to correct for higher levels of cross-talk. |

10/03/13 20130259178 | **Adaptive optimum cdr bandwidth estimation by using a kalman gain extractor** Exemplary embodiments of the present invention relate to a clock and data recovery (cdr) apparatus with adaptive optimum cdr bandwidth estimation by using a kalman gain extractor. The kalman gain extractor includes an off chip digital processor which receives a phase update information from the cdr outputs an estimated optimum kalman gain obtained by extracting the standard deviation of step sizes of the accumulation jitter from the power spectral density (psd) of the phase update information, and a on chip digital loop filter consists of a cyclic accumulator which accumulates the phase detector's output, a gain multiplier and a phase interpolator (or dco) controller. |

09/26/13 20130253920 | **Method and apparatus for robust speaker and speech recognition** A method of processing a speech signal comprises converting the speech signal to digital signals, converting the digital speech signal into short-time frames, applying a fast fourier transform to each of the short-time frames to obtain an original spectrum, deriving a varied spectrum based on the original spectrum, applying discrete cosine transform to compute original cepstrum coefficients for the original spectrum and varied cepstrum coefficients for the varied spectrum and generating a set of frontend feature vectors for each of the short-time frames.. . |

09/26/13 20130253858 | **Ultrasonic measurement and determination of crystallographic texture with respect to position** A technique and device (12) may be utilized to determine a characteristic of a crystallographic texture of a sample (10) based on a detected ultrasonic waveform. The device may be configured to receive ultrasonic waveform data representative of a reflected ultrasonic waveform that propagated through a sample from an ultrasonic detector (14). |

09/26/13 20130253850 | **Health monitoring method and system for drives** In an exemplary method for condition monitoring of electric and mechanical drives, measurement data in a condition monitoring system of electric drives is collected at least from one electric drive. The measurement data is pre-treated, a frequency spectrum is created from the pre-treated measurement data with the fast fourier transform transformation, and a detected vibration frequency and vibration amplitude are recorded from the frequency spectrum. |

09/26/13 20130251056 | **Communication device and communication method** A modulator generates a subcarrier modulation signal from an input signal, a parallel-serial converter generates a subcarrier modulation signal from the modulation signal. An ifft calculator performs reverse fast fourier transform on the subcarrier modulation signal, and a separator separates a calculation result into real part data and imaginary part data. |

09/05/13 20130230120 | **Apparatus and methods for long and short training sequences for a fast fourier transform** Apparatus and methods for communicating and applying training sequences are described herein. For example, provided is a method for generating a short training field (stf) sequence comprising thirty two values or less. |

08/29/13 20130223560 | **Communication apparatus and communication method** A modulator generates a modulation signal from an input signal, and a serial-parallel converter generates a subcarrier modulation signal from the modulation signal. An ifft unit performs an inverse fast fourier transformation on the subcarrier modulation signal, and a decomposer decomposes a calculation result into a real part data and an imaginary part data. |

08/29/13 20130222290 | **Noise spectrum estimator and touch screen device including the same** A noise spectrum estimator for a touch panel includes an adaptive impulse response generation unit configured to generate impulse response information by performing an adaptive training operation on noise data, the noise data being generated by sampling a plurality of noise signals received from the touch panel, and an estimation unit configured to generate noise frequency spectrum estimation information associated with the noise data by performing a fast fourier transform (fft) on the impulse response information.. . |

08/22/13 20130215994 | **Communication apparatus and communication method** A serial-parallel converter generates a subcarrier modulation signal from a modulation signal which is generated from the input signal by a modulator. An ifft unit performs an inverse fast fourier transformation on the subcarrier modulation signal. |

08/22/13 20130215993 | **Systems and methods for detecting transmissions based on 32-point and 64-point fast fourier transforms** Systems, methods, and devices for communicating and detecting training sequences are described herein. In one aspect, a method of wireless communication is provided. |

08/15/13 20130211574 | **Cutter chatter monitoring method** A cutter chatter monitoring method comprises the steps of capturing a cutting vibration acceleration signal; dividing the cutting vibration acceleration signal in each predetermined time period into a plurality of segments; determining whether the vibration acceleration signal of each segment is increased by a multiple greater than a threshold value; performing a fast fourier transform of the cutting vibration acceleration signal in each predetermined time period; calculating a vibration frequency; determining whether the vibration frequency of the cutting vibration acceleration signal is a multiple of a cutter passing frequency; and increasing a main shaft rotating speed of a cutter to avoid cutter chatters if both aforementioned conditions are satisfied.. . |

08/15/13 20130211570 | **Build up edge monitoring method** A build up edge monitoring method is provided for performing online real-time detection and suppression of abnormal build up edges of cutters occurred in a cnc manufacturing process. Signal variation analysis and fast fourier transform are used for analyzing signals and establishing an algorithm of diagnosing build up edges to improve the efficiency and reliability of the cutting abnormality diagnostics. |

08/08/13 20130202060 | **Communication apparatus and communication method** A modulator generates a modulation signal from an input signal, and a serial-parallel converter generates a subcarrier modulation signal from the modulation signal. An ifft unit performs an inverse fast fourier transformation on the subcarrier modulation signal to generate first data. |

08/08/13 20130201982 | **Pilot signal in an fdma communication system** Methods (500, 800) and corresponding systems (100, 200, 300, 400, 900) for generating a pilot symbol (330) include providing an m-point parallel transform sequence that is a discrete fourier transform of a cazac sequence (312, 504-508). The m-point parallel transform sequence (312) is distributed (316, 510) to a set of m subcarriers among n subcarriers to form an n-point frequency-domain sequence (318) wherein the m subcarriers are evenly spaced apart. |

08/01/13 20130195098 | **Communication apparatus and communication method** A modulator generates a modulation signal from an input signal. A serial-parallel converter generates a subcarrier modulation signal from the modulation signal. |

07/25/13 20130188631 | **Communication apparatus and communication method** A modulator generates a modulation signal from an input signal. A serial-parallel converter generates a subcarrier modulation signal from the modulation signal. |

07/25/13 20130187814 | **Scanning measurements on generalized grids** A scanning measurement apparatus and method comprising a device under test for receiving or transmitting a signal, a measurement probe, a robot for moving the device or the probe relative to one another to scan continuously over a two-dimensional planar, cylindrical or spherical surface in a three-dimensional space, and a controller for obtaining measurement samples at generalized grid points on the two-dimensional surface computing characteristic coefficients from the measured values, wherein the characteristic coefficients are recovered using a conjugate gradient method, using in part an unequally spaced fast fourier transform or using a conjugate gradient method and an unequally spaced fast fourier transform.. . |

07/25/13 20130186462 | **Transparent electroconductive substrate for solar cell, method for manufacturing the substrate, and solar cell using the substrate** When a fourier-transformed image is obtained by performing two-dimensional fast fourier transform processing on a concavity and convexity analysis image obtained by analyzing a shape of the concavities and convexities by use of an atomic force microscope, the fourier-transformed image shows a circular or annular pattern substantially centered at an origin at which an absolute value of wavenumber is 0 μm−1, and the circular or annular pattern is present within a region where an absolute value of wavenumber is within a range from 0.5 to 10 μm−1.. . |

07/11/13 20130179112 | **Robust method for signal segmentation for motion classification in personal navigation** A method to accurately detect true peaks and true valleys in a real-time incoming signal is provided. The method includes segmenting the real-time incoming signal into short-time intervals; determining an initial estimated frequency by fast fourier transforming data in the short-time intervals, setting a sliding window width based on the initial estimated frequency, determining at least one peak data element or valley data element based on analysis of the real-time incoming signal within a first sliding window; and determining at least one peak data element or valley data element based on analysis of the real-time incoming signal within a second sliding window. |

07/11/13 20130178735 | **System and method for acquiring images from within a tissue** Systems and methods for imaging within depth layers of a tissue include illuminating light rays at different changing wavelengths (frequencies), collimating illuminated light rays using a collimator, and splitting light rays using a beam splitter, such that some of the light rays are directed towards a reference mirror and some of the rays are directed towards the tissue. The systems and methods further include reflecting light rays from the reference mirror towards the imager, filtering out non-collimated light rays reflected off the tissue by using a telecentric optical system, and reflecting collimated light rays reflected off the tissue towards the imager, thus creating an image of an interference pattern based on collimated light rays reflected off the tissue and off the reference mirror. |

07/04/13 20130173988 | **Mixed domain fft-based non-binary ldpc decoder** Various embodiments of the present invention are related to methods and apparatuses for decoding data, and more particularly to methods and apparatuses for decoding data in a mixed domain fft-based non-binary ldpc decoder. For example, in one embodiment an apparatus includes a message processing circuit operable to process variable node messages and check node messages in a log domain, and a check node calculation circuit in the low density parity check decoder operable to perform a fast fourier transform-based check node calculation in a real domain. |

07/04/13 20130172030 | **Cognitive radio sensing method and system** The cognitive radio system and method uses a wideband chirp signal for characterization of the spectra that a mobile radio may use. A cognitive radio base station broadcasts the low power reference wideband chirp signal with bandwidth covering the sensed spectrum. |

07/04/13 20130170586 | **Radar detection method and system using low-resolution ffts** A method of identifying radar in a wireless device includes detecting an event corresponding to receipt of a signal by the wireless device. The event can include an analog to digital converter (adc) saturation, a radio frequency (rf) saturation, and/or an adc power high condition. |

06/27/13 20130163896 | **Image registration method and system robust to noise** An image registration method is disclosed for processing a distorted image into a registered image that is aligned with reference to an original image. Distortions from the original image may include scaling, rotation, and noise. |

06/20/13 20130159554 | **Method of performing distributed synchronization in ad hoc network system** There is provided a method of performing distributed synchronization in an ad hoc network system. The method includes receiving a signal, including a reception time point change period, through a plurality of nodes, changing a reception time point at which the signal is received through the plurality of nodes within the reception time point change period so that the reception time point is included in a preset cyclic prefix (cp) period, changing a fast fourier transform (fft) start time point which is a time point at which data starts being recovered based on the changed reception time point, and changing the reference point of the transmission time point of each of the plurality of nodes based on a difference value between the preset reference point of the fft start time point and the changed fft start time point. |