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Fourier Transform

Fourier Transform patent applications listed include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.

Related Categories:

Multiplex Communications


Generalized Orthogonal Or Special Mathematical Techniques > Fourier Transform



Base station apparatus for decreasing amount of transmission data with cloud radio access network
11/13/14 - 20140334285 - There is disclosed a base station apparatus having a cloud radio access network (CRAN) structure. The base station apparatus includes a digital unit (DU) that includes a baseband processing unit for processing signals of a baseband, a Fast Fourier Transform (FFT) operation unit that converts baseband signals of a time...

Apparatus and methods for update of symbol information
09/25/14 - 20140286153 - Apparatus and methods for updating symbol information in a communication device with hardware such as a microcontroller are disclosed. The disclosed apparatus and methods employ waiting for the beginning of a symbol in a sample stream at a predetermined time. One or more programmed instructions are read at the beginning...

Enhanced radar detection for communication networks
09/11/14 - 20140254346 - Radar signals can be detected by a Wireless Local Area Network (WLAN) receiver by modifying one or more pattern matching attributes. In one embodiment, the pattern matching attributes are modified when signal pulses received by the WLAN receiver are determined to have an increased likelihood of being radar signals. In...

Device for generating ranging signal of wireless communication system and method of generating ranging signal of wireless terminal
06/12/14 - 20140160917 - There are provided a method of generating a ranging signal of a wireless terminal and a device for generating a ranging signal of a wireless communication system that can generate the ranging signal using one IFFT engine independently from a mode of the ranging signal transmitted in uplink in a...

Method for generating an ofdm data signal
05/22/14 - 20140140194 - An OFDM signal generator includes a time domain data signal generator configured to generate a time domain data signal, a partial signal generator configured to generate a plurality of partial signals based on a tail section of the time domain data signal, and a circuit element configured to form a...

Communication method and transmission apparatus
05/22/14 - 20140140195 - An electronic device that performs an inverse fast Fourier transform (IFFT) on N (N is an integer equal to or larger than 2) orthogonal frequency-division multiplexed (OFDM) transmission signals; performs a fast Fourier transform (FFT) on the N transmission signals which have been subjected to the IFFT; detects phases of...

Methods and devices for transmission of signals in a telecommunication system
03/20/14 - 20140078881 - A first, original, bit sequence, is repeated and a cyclic prefix and a cyclic postfix is added to the repeated bit sequence thereby forming the training sequence for the user....

Mimo beamforming-based single carrier frequency division multiple access system
02/06/14 - 20140036655 - 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. The frequency domain transmit data is mapped to assigned subcarriers. An inverse fast Fourier transform (IFFT) is...

Wireless communication system and communication method therefor
01/23/14 - 20140022884 - Disclosed is a communication method comprising: determining the length, N, of a random access sequence on the basis of system configuration information, where N is less than or equal to the number of available subcarriers; determining a cyclic shift parameter collection and a cyclic prefix on the basis of a...

Phase-rotated reference signals for multiple antennas
01/16/14 - 20140016451 - Systems, methods, and apparatuses for phase-rotated reference signals are provided. In accordance with one implementation, phase-rotated reference signals are transmitted from multiple transmit antennas on the same reference signal (RS) resource elements. The receiver may determine channel coefficients for links corresponding to the multiple antennas, based on the received signals...

Transmitting apparatus, receiving apparatus, communication system, and communication method
01/16/14 - 20140016452 - A transmitting apparatus includes a group processing unit configured to divide plurally data of one block, control processing units configured to perform predetermined control processing for each of the divided data, a combination processing unit configured to combine the data subjected to the control processing into one signal, a transmission...

Coding and multiplexing of control information in a wireless communication system
11/28/13 - 20130315051 - Techniques for sending control information in a wireless communication system are described. In an aspect, a UE spreads control information across frequency with a DFT and across time with an orthogonal sequence to obtain output data for the control information. In one design, the UE receives codewords for N HARQ...

Nc-ofdm for a cognitive radio
11/07/13 - 20130294219 - The present invention is directed to a method for use in a cognitive radio. A Fourier transform of a time domain signal is performed to obtain a series of frequency domain samples covering substantially the entire predetermined RF spectrum, the time domain signal corresponding to the RF waveform, each frequency...

Methods and apparatus for signal conditioning in ofdma systems
08/08/13 - 20130201814 - Methods and systems for conditioning an orthogonal frequency division multiplex (OFDM) signal are disclosed. The OFDM signal may be conditioned prior to transmission by a transmitter in an orthogonal frequency division multiple access (OFDMA) system operating on a channel with a plurality of subcarriers grouped into subchannels. The OFDM signal...

Method and apparatus for receiving physical uplink control channel in lte system
07/11/13 - 20130176841 - The present document discloses an apparatus for receiving Physical Uplink Control Channel (PUCCH) in Long Term Evolution (LTE) system, comprising: blocks of system FFT performing system FFT on data from a plurality of antennas, blocks of PUCCH RB processing units receiving the allocated logic resource index table and the local...

Data processing device of multi-carrier system and data processing method thereof
06/27/13 - 20130163403 - A data processing method of a multi-carrier receiving device, according to an embodiment of the present invention, includes determining a data processing order for user data provided from a plurality of different users according to a unit data length detected from user information, processing in parallel the user data according...

Apparatus and method for i/q offset cancellation in sc-fdma system
06/20/13 - 20130155833 - The present invention relates to an apparatus and a method for eliminating I/Q offset in a receiver of a SC-FDMA system which improves performance of the system by accurate measurement and cancellation of I/Q offset in a receiver of a SC-FDMA system operating in a 3GPP LTE uplink. An apparatus...

Offset modulation orthogonal frequency division multiplexing (ofdm) and multi-access transmission method with cyclic prefix (cp)
06/13/13 - 20130148488 - The present invention provides an Offset Modulation Orthogonal Frequency Division Multiplexing (OFDM) and multi-access transmission method with a Cyclic Prefix (CP), including a generating method of the sent signal in the sending terminal and a processing method of the received signal in the receiving terminal, the method includes: in the...

Transmitting device, receiving device, and signal processing method in radio communication system
05/23/13 - 20130128717 - A radio communication system using an orthogonal frequency division multiplexing system, including: a baseband unit; and one or plural remote radio units coupled with the baseband unit through an interface; wherein the baseband unit includes a first sample frequency conversion part that performs a first sample frequency conversion processing that...

Systems and method for orthogonal frequency divisional multiplexing
05/16/13 - 20130121131 - Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output; a transmitter configured to modulate symbols onto at least one...

Method of handling shortened resource block for mtc device and related communication device
05/09/13 - 20130114393 - A method of arranging a shortened resource block (RB) without a direct current (DC) subcarrier for a wireless communication system comprising a communication device and a network is disclosed. The method comprises selecting a RB from a plurality of RBs comprising a plurality of available subcarriers, according to a configuration,...

Odfm receiver
05/02/13 - 20130107695 - The present invention relates to an orthogonal frequency-division multiplexing receiver, and more particular to an orthogonal frequency-division multiplexing receiver including an FFT/IFFT operating core and a scheduler. In order to simultaneously share the FFT/IFFT operating core, the scheduler manages input/output timings of FFT/IFFT operations and control signals. The FFT/IFFT operating...

Dynamically selecting methods to reduce distortion in multi-carrier modulated signals resulting from high peak-to-average power ratios
04/18/13 - 20130094345 - In one embodiment, an algorithm dynamically selects a method for reducing distortion in a multi-carrier modulated signal, such as an orthogonal frequency division multiplexing (OFDM) signal. The algorithm directs a transmitter to transmit peak-to-average power ratio (PAPR)-reduction signals over reserved tones (i.e., frequencies) if reserved tones are available. If reserved...

Method and device for sinr estimation
04/11/13 - 20130088950 - A method (200) for a transceiver in a mobile system for determining the SINR for signals from at least two User Equipments during a future time interval, comprising arranging the transceiver to receive (205) transmissions from User Equipments in the mobile system on one radio channel per User Equipment, choosing...

Radio communication device and signal division method
03/28/13 - 20130077466 - Provided is a radio communication device which can reduce ISI caused by destruction of an orthogonal DFT matrix even when an SC-FDMA signal is divided into a plurality of clusters and the clusters are respectively mapped to discontinuous frequency bands. The radio communication device includes a DFT unit (110), a...

Receiver in orthogonal frequency division multiple access system and signal processing method thereof
03/28/13 - 20130077467 - According to an exemplary embodiment of the present invention, a receiver in an orthogonal frequency division multiple access (OFDMA) system includes: an extraction unit that extracts received user signal subvectors for subcarriers assigned to the receiver from received signal vectors received from a transmitter; and a fast Fourier transform (FFT)...

Preambles in ofdma system
03/28/13 - 20130077468 - The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of...

Preambles in ofdma system
03/28/13 - 20130077469 - The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of...

User equipment and method for radio communication system
02/28/13 - 20130051212 - User equipment includes a convertor that converts transmission target frequency domain signal into time domain signal; a quadrature modulator that applies quadrature modulation to the time domain signal; a cancellation signal generator that generates image leakage cancellation signal by converting image signal into time domain signal, and applying the quadrature...

Discrete fourier calculation device, radio communication device, and discrete fourier calculation method
02/14/13 - 20130039165 - A discrete Fourier calculation device includes a twiddle factor table storage unit that stores therein a twiddle factor table that associates twiddle factors with phases of the corresponding twiddle factors; a correction value specifying unit that specifies first and second correction values for correcting a phase of an input signal...

System and method for initial ranging in wireless communication systems
12/20/12 - 20120320730 - A system and method for initial ranging in wireless communication systems is provided. A plurality of orthogonal frequency division multiplexing (OFDM) blocks are received by an OFDMA base station transceiver from a plurality of remote user devices in wireless communication with the base station. A ranging subchannel is extracted from...

Interference rejection method based on multiple sub-band projections
12/13/12 - 20120314560 - This invention describes a cognitive radio signal processing where interference is mitigated using multiple frequency spatial projection to orthogonalize interference. The method is based on the well-known LMS solution of W=(ATA)−1*d that is computed from received multi antenna and multicarrier signals in a novel way....

Method and apparatus for implementing preamble generation
12/13/12 - 20120314561 - The disclosure involves a method and an apparatus for implementing preamble generation. The method comprises: obtaining a first parameter value according to a root sequence number of a Zadoff-Chu (ZC) sequence; obtaining an initial value of a first sequence, according to a length and a cyclic shift value of the...

Base station and method of adjusting reference timing on base station
11/22/12 - 20120294138 - An FFT processing unit performs an FFT process on an OFDM signal received by a reception unit. Based on an output signal of the FFT processing unit, an interference wave level acquisition unit obtains a signal level of an interference wave in a unit radio resource not used by the...

Ofdm generation apparatus in a multi-carrier data transmission system
11/15/12 - 20120287771 - OFDM generation apparatus and methods generating OFDM transmission signals from OFDM symbols, each including a plural OFDM subcarriers, for transmission in a multi-carrier data transmission system. In OFDM systems using the concept of Absolute OFDM and/or using Segmented OFDM common phase rotations of the OFDM subcarriers of the OFDM symbol...

Wireless communication apparatus and wireless communication method
11/01/12 - 20120275291 - By using a discrete Fourier transform equation that is used to transform N data values (N is an integer equal to or greater than one) to N transformation values, a wireless communication apparatus calculates three continuous transformation values from the N data values. Then, the wireless communication apparatus obtains a...

Apparatuses and methods for detecting a group delay in a communication system
10/04/12 - 20120250493 - The exemplary embodiments of the present invention relate to a transmission part (500), to a receiver part (600), to a transceiver comprising the transmission and receiver parts, to a radio base station comprising the transceiver, to a method in the transmission part (500) and to a method in a receiver...

Radio communication method, radio communication system, and radio transmission apparatus
08/23/12 - 20120213054 - A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section;...

Systems and methods for orthogonal frequency divisional multiplexing
08/02/12 - 20120195184 - Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals; a processor coupled to the transmitter, wherein the processor outputs data for transmission by...

Sounding reference signal processing for lte
07/19/12 - 20120182857 - A wireless communication receiver including a serial to parallel converter receiving an radio frequency signal, a fast Fourier transform device connected to said serial to parallel converter converting NFFT corresponding serial signals into a frequency domain; an EZC root sequence unit generating a set of root sequence signals; an element-by-element...

Method and system for optical orthogonal frequency division multiplexing with hadamard transform combined with companding transform
07/12/12 - 20120176886 - A combined Hadamard and companding transform technique is incorporated into orthogonal frequency division multiplexed signals to reduce the peak-to-average ratio of signals. A Hadamard transform is applied to the signals to generate a first transformed signal of subsymbols. An Inverse Fast Fourier Transform is performed on the subsymbols to generate...

Interference randomization for uplink signaling
06/28/12 - 20120163159 - A method for transmitting an acknowledgement/negative acknowledgement is described. Cell-specific symbol-level cyclic shift hopping is applied to data single-carrier frequency division multiplexing symbols of the acknowledgement/negative acknowledgement. A discrete Fourier transform is applied to the data single-carrier frequency division multiplexing symbols. Cell-specific symbol-level phase hopping is applied to the data...

Signal receiving apparatus and communication system
05/24/12 - 20120127849 - There is provided a signal receiving apparatus including first to pth stage computers configured to apply, in a step-by-step manner, butterfly operations to 2N input values; and 2N registers configured to store values obtained by a p−1th stage computer wherein the pth stage computer includes (a) 2L butterfly operation circuits...

Method for a radio base station and a radio base station in a communication network system for assisting in or obtaining assistance in the ul reception of signals
03/15/12 - 20120063294 - In cellular radio systems it is a problem to provide service to UE (user equipment) on the cell border. In systems that apply a frequency re-use of one, and OFDM access technology, the uplink direction need be improved. One embodiment of this application relates to a radio base station that...

Wireless communication apparatus and frequency hopping method
03/08/12 - 20120057449 - Disclosed are a wireless communication apparatus and frequency hopping method which minimize the change in the instantaneous power distribution characteristics of the time waveform of transmission signals when a plurality of channels are multiplexed by frequency division. At a terminal (200), a mapping unit (212) maps the PUCCH to frequency...

Variable bandwidth ofdm receiver and methods for receiving ofdm signals of different bandwidths
02/02/12 - 20120026862 - A variable bandwidth OFDM receiver and methods for receiving OFDM signals of different bandwidths are generally disclosed herein. The variable bandwidth OFDM receiver may be configured to receive signals over wider bandwidths by processing a resource block of subcarriers comprising a greater number of subcarriers, and receive signals over narrower...

Device and method for fast fourier transform
01/26/12 - 20120020201 - A device and a method for Fast Fourier Transform (FFT) are disclosed. The device includes a data receiving module, an address translation module, a data storage module, a FFT module, a data extraction module and a data output module. The data receiving module is configured to receive the input data....

Method and apparatus for diversity transmission scheme in single-carrier fdma systems
12/29/11 - 20110317542 - The disclosure relates to transmission of user data over multiple transmission layers in a wireless communication system with single-carrier orthogonal frequency division multiple access. A wireless terminal performs transform precoding on a vector of digital modulation symbols and the resulting complex-valued symbols are mapped to frequency/time/space resources. The digital modulation...

Soft handoff in ofdma system
12/22/11 - 20110310725 - Soft handoff in an OFDMA system is disclosed. If the pilot signal strength for a base station exceeds the defined threshold, the base station is added to an active set list. Subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols are divided and allocated into subchannels. The OFDM...

Mobile multimedia broadcast transmission system
12/08/11 - 20110299381 - A mobile multimedia broadcast transmission system is provided, which comprises: a Reed-Solomon (RS) coding and byte interleaving unit, a Low Density Parity Check (LDPC) coder, a bit interleaver, a constellation mapping unit, a frequency domain symbol generator, a scrambler, an Inverse Fast Fourier Transform (IFFT) unit, a time domain framing...

Communication devices for generating and using a matrix-mapped sequence
12/08/11 - 20110299382 - A communication device for generating a matrix-mapped sequence is described. The communication device includes sequence generation circuitry. The communication device also includes mapping circuitry coupled to the sequence generation circuitry. The mapping circuitry applies a first matrix with at least one column multiplied by −1 to a sequence. The communication...

Method for transmitting data in multiple antenna system
12/08/11 - 20110299383 - An apparatus for data transmission in a multi-antenna system is provided. The apparatus includes: a modulation mapper for modulating codewords into modulation symbols that express a position on a signal constellation; a layer permutator for mapping the modulation symbols to different layers; a transform precoder for generating a discrete Fourier...

Pilot signal in an fdma communication system
12/08/11 - 20110299384 - 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...

Backward-compatible long training sequences for wireless communication networks
11/17/11 - 20110280117 - A network device for generating an expanded long training sequence with a minimal peak-to-average ratio. The network device includes a signal generating circuit for generating the expanded long training sequence. The network device also includes an Inverse Fourier Transform for processing the expanded long training sequence from the signal generating...

Cm/papr reduction for lte-a downlink with carrier aggregation
10/27/11 - 20110261676 - The present invention relates to the reduction of the CM and PAPR of an LTE-A downlink signal after carrier aggregation. The CM and PAPR of the aggregated signal are reduced by introducing cyclic time shifts to the OFDM symbols in each of the component carriers (CC). Out of all the...

Apparatus and method for supporting various system bandwidths in a broadband wireless communication system
10/27/11 - 20110261677 - An apparatus and method support various system bandwidths in a broadband wireless communication system. A Mobile Station (MS) operation includes determining a system bandwidth through a primary preamble for frame synchronization, which a Base Station (BS) transmits. A Fast Fourier Transform (FFT) size, the number of guard subcarriers, and the...

Systems and methods for orthogonal frequency division multiplexing
10/06/11 - 20110242963 - Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to receive a waveform comprising spectrally overlapping carrier signals from at least two of a plurality of remotes, wherein the spectrally overlapping carrier signals are modulated using an inverse Fourier...

Downlink acquisition
10/06/11 - 20110242964 - The subject matter disclosed herein provides methods and apparatus, including computer program products, for detecting a preamble to enable acquisition of a downlink. In one aspect, there is provided a method. The method may include receiving a plurality of symbols. From an autocorrelation of the received symbols, a guard interval...

Receiving apparatus and method
09/08/11 - 20110216644 - A receiving apparatus includes a first transform unit configured to perform orthogonal transform on a time-domain input signal and perform saturation when an overflow occurs to transform the input signal into a plurality of frequency-domain signals, a second transform unit configured to perform orthogonal transform on the time-domain input signal...

Sequence-generating method, and apparatus for same
08/18/11 - 20110199889 - The present invention relates to a wireless communication system. More particularly, the present invention relates to a method for enabling a transmitter to transmit a sequence in a wireless communication system, and to an apparatus for the same. A sequence-transmitting method comprises the steps of: performing at least one of...

Method and apparatus for waveform independent ranging
08/11/11 - 20110194402 - A system and method for calculating a time of arrival (TOA) of an electromagnetic signal is presented. A method receives a fast Fourier transform (FFT) signal that is a FFT of an original electromagnetic signal containing symbol data. The FFT signal is either multiplied or divided with a value to...

Fast fourier transform and inverse fast fourier transform (fft/ifft) operating core
07/07/11 - 20110164490 - An FFT/IFFT operating core capable of minimizing a required memory depth during operation is disclosed. The FFT/IFFT operating core includes an inputting buffer, a first multiplexer, an operating module, and a controlling module. The inputting buffer stores and outputs a first FFT input sequence. The first multiplexer is utilized to...

Method and system for combining ofdm and transformed ofdm
07/07/11 - 20110164491 - Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted...

Method and system for combining ofdm and transformed ofdm
07/07/11 - 20110164492 - Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted...

Fast fourier transform apparatus and method
06/23/11 - 20110149718 - A fast Fourier transform (FFT) apparatus and method. The FFT method may include finding a number of subcarriers carrying valid data in reception data, determining a Fourier transform order on the basis of the number of subcarriers, performing complex multiplication on the reception data, and then performing a Fourier transform...

Method for separating blind signal and apparatus for performing the same
06/23/11 - 20110149719 - A method for separating a blind signal includes: converting mixed signals of a time domain collected by using a plurality of sensors into mixed signals of a frequency domain; calculating a separation filter from the mixed signals which have been converted into those of the frequency domain; calculating an inverse...

Interference cancellation with mu-mimo scheme in sc-fdma system
05/26/11 - 20110122760 - An apparatus and a method for interference cancellation using a multi-user multiple input multiple output (MU-MIMO) scheme in a single carrier frequency division multiple access (SC-FDMA) system are disclosed. Received data of every terminal are classified into first received data and second received data. The first received data has lower...

Ofdm system and method employing ofdm symbols with known or information-containing prefixes
05/19/11 - 20110116360 - Systems and methods for transmitting and receiving OFDM symbols are provided which enable the otherwise wasted transmission time normally used as a prefix for each OFDM symbol to contain useful information. At the receiver, the received signal is processed to convert received OFDM symbols from a linear convolution with the...

Digital signal demultiplexing apparatus and digital signal multiplexing apparatus
05/19/11 - 20110116361 - A digital signal demultiplexing apparatus that can demultiplex and a digital signal multiplexing apparatus that can multiplex signals of channels having arbitrary frequency intervals and bandwidths are provided. The digital signal demultiplexing apparatus performs discrete Fourier transform on an input signal, output samples existing within frequency bands of each channel...

Method and apparatus for generating ranging preamble code in wireless communication system
05/05/11 - 20110103219 - A method and apparatus of generating a ranging preamble code in a wireless communication system comprises generating a Zadoff-Chu (ZC) sequence in which a cyclic shift is applied to each of a plurality of orthogonal frequency division multiple access (OFDMA) symbols as a ranging preamble code, wherein the cyclic shift...

Precoding method for reducing uplink papr and apparatus thereof
04/28/11 - 20110096658 - A radio communication system is provided. An uplink transmission method of a user equipment in a radio communication system includes performing Fourier transform on one or more data sequences to generate one or more first frequency-domain sequences, applying precoding for multi-antenna transmission to the one or more first frequency-domain sequences...