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Multiplex Communications > Generalized Orthogonal Or Special Mathematical Techniques > Fourier Transform

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.

03/20/14 - 20140078881 - Methods and devices for transmission of signals in a telecommunication system
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....

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. The frequency domain transmit data is mapped to assigned subcarriers. An inverse fast Fourier transform (IFFT) is...

01/23/14 - 20140022884 - Wireless communication system and communication method therefor
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...

01/16/14 - 20140016451 - Phase-rotated reference signals for multiple antennas
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...

01/16/14 - 20140016452 - Transmitting apparatus, receiving apparatus, communication system, and communication method
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...

11/28/13 - 20130315051 - Coding and multiplexing of control information in a wireless communication system
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...

11/07/13 - 20130294219 - Nc-ofdm for a cognitive radio
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...

08/08/13 - 20130201814 - Methods and apparatus for signal conditioning in ofdma systems
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...

07/11/13 - 20130176841 - Method and apparatus for receiving physical uplink control channel in lte system
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...

06/27/13 - 20130163403 - Data processing device of multi-carrier system and data processing method thereof
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...

06/20/13 - 20130155833 - Apparatus and method for i/q offset cancellation in sc-fdma system
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...

06/13/13 - 20130148488 - Offset modulation orthogonal frequency division multiplexing (ofdm) and multi-access transmission method with cyclic prefix (cp)
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...

05/23/13 - 20130128717 - Transmitting device, receiving device, and signal processing method in radio communication system
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...

05/16/13 - 20130121131 - Systems and method for orthogonal frequency divisional multiplexing
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...

05/09/13 - 20130114393 - Method of handling shortened resource block for mtc device and related communication device
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,...

05/02/13 - 20130107695 - Odfm receiver
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...

04/18/13 - 20130094345 - Dynamically selecting methods to reduce distortion in multi-carrier modulated signals resulting from high peak-to-average power ratios
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...

04/11/13 - 20130088950 - Method and device for sinr estimation
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...

03/28/13 - 20130077466 - Radio communication device and signal division method
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...

03/28/13 - 20130077467 - Receiver in orthogonal frequency division multiple access system and signal processing method thereof
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)...

03/28/13 - 20130077468 - Preambles in ofdma system
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...

03/28/13 - 20130077469 - Preambles in ofdma system
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...

02/28/13 - 20130051212 - User equipment and method for radio communication system
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...

02/14/13 - 20130039165 - Discrete fourier calculation device, radio communication device, and discrete fourier calculation method
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...

12/20/12 - 20120320730 - System and method for initial ranging in wireless communication systems
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...

12/13/12 - 20120314560 - Interference rejection method based on multiple sub-band projections
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....

12/13/12 - 20120314561 - Method and apparatus for implementing preamble generation
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...

11/22/12 - 20120294138 - Base station and method of adjusting reference timing on base station
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...

11/15/12 - 20120287771 - Ofdm generation apparatus in a multi-carrier data transmission system
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...

11/01/12 - 20120275291 - Wireless communication apparatus and wireless communication method
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...

10/04/12 - 20120250493 - Apparatuses and methods for detecting a group delay in a communication system
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...

08/23/12 - 20120213054 - Radio communication method, radio communication system, and radio transmission apparatus
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;...

08/02/12 - 20120195184 - Systems and methods for orthogonal frequency divisional multiplexing
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...

07/19/12 - 20120182857 - Sounding reference signal processing for lte
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...

07/12/12 - 20120176886 - Method and system for optical orthogonal frequency division multiplexing with hadamard transform combined with companding transform
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...

06/28/12 - 20120163159 - Interference randomization for uplink signaling
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...

05/24/12 - 20120127849 - Signal receiving apparatus and communication system
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...

03/15/12 - 20120063294 - 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
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...

03/08/12 - 20120057449 - Wireless communication apparatus and frequency hopping method
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...

02/02/12 - 20120026862 - Variable bandwidth ofdm receiver and methods for receiving ofdm signals of different bandwidths
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...

01/26/12 - 20120020201 - Device and method for fast fourier transform
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....

12/29/11 - 20110317542 - Method and apparatus for diversity transmission scheme in single-carrier fdma systems
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...

12/22/11 - 20110310725 - Soft handoff in ofdma system
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...

12/08/11 - 20110299381 - Mobile multimedia broadcast transmission system
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...

12/08/11 - 20110299382 - Communication devices for generating and using a matrix-mapped sequence
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...

12/08/11 - 20110299383 - Method for transmitting data in multiple antenna system
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...

12/08/11 - 20110299384 - 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...

11/17/11 - 20110280117 - Backward-compatible long training sequences for wireless communication networks
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...

10/27/11 - 20110261676 - Cm/papr reduction for lte-a downlink with carrier aggregation
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...

10/27/11 - 20110261677 - Apparatus and method for supporting various system bandwidths in a broadband wireless communication system
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...

10/06/11 - 20110242963 - Systems and methods for orthogonal frequency division multiplexing
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...

10/06/11 - 20110242964 - Downlink acquisition
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...