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| Number | Title | Issue Date |
| 8189700 | Signal generation device and signal generation method A signal generation device that employs a transmission method that uses inverse Fourier transform includes: a modulation unit configured to modulate transmission data to obtain modulation data; a serial-parallel conversion unit configured to convert the modulation d... | 05/29/2012 |
| 8189703 | Television mobile internet system Mobile device for receiving, demodulating, processing and storing an internet network or a cellular system provided photo, video or television (TV) signal. Processing photo and video signals generated in a cellular phone or mobile device and providing photo and vide... | 05/29/2012 |
| 8189701 | Adaptive modulation scheme and data rate control method A radio communication system includes a first radio station for dividing codewords into communication units and transmitting the divided codewords by modulating them in every communication unit, and a second radio station for coupling and decoding signals obtained b... | 05/29/2012 |
| 8189696 | Orthogonal frequency division multiplexing communication system, multi-hop system, relay station, and spatially layered transmission mode An apparatus and method for data transmission in an Orthogonal Frequency Division Multiplexing (OFDM) communication system are provided. An OFDM system includes a reference Relay Station (RS) and a cooperative relay station respectively for performing an Spatially L... | 05/29/2012 |
| 8189697 | Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and receiver channel estimate circuit A communications device includes a demapping and demodulation circuit that demaps and demodulates an OFDM communications signal as modulated subcarriers carrying communications data and modulated subcarriers carrying a training sequence forming a preamble that inclu... | 05/29/2012 |
| 8189695 | Transmission method and transmission apparatus in an OFDM-CDMA communication system A OFDM-CDMA communication system that generates a plurality of subcarrier components by multiplying each of a plurality of transmission symbols by a channelization code whose length is N according to a spreading factor, and transmits those subcarrier components by a... | 05/29/2012 |
| 8189699 | Method for transmitting ACK/NACK signal and method for establishing the signal transmission A method for transmitting an ACK/NACK signal and a method for establishing the signal transmission are disclosed. A system for the method determines whether the ACK/NACK signal is repeatedly transmitted or not according to channel environments of a user, and transmi... | 05/29/2012 |
| 8189702 | Scattering-parameter estimation method and transceiver using the same The present invention discloses a scattering-parameter estimation method for a transceiver of a half-duplex multicarrier communication system. The scattering-parameter estimation method includes steps of converting a first frequency-domain transmit signal to generat... | 05/29/2012 |
| 8189698 | Communication apparatus A wave detecting section of a receiver has a first wavelet transformer involving a plurality of wavelet filters orthogonal to each other for performing a wavelet transform on received waveform data, a Hilbert transformer for performing a Hilbert transform on the rec... | 05/29/2012 |
| 8184728 | Adaptive symbol transition method for OFDM-based cognitive radio systems and method of use In accordance with the present invention, a system and method for orthogonal frequency division multiplexing (OFDM) sidelobe suppression is provided. In a particular embodiment an extension is added to OFDM symbols that is calculated using optimization methods to mi... | 05/22/2012 |
| 8184730 | Method and system for frequency band allocation based on frequency band usage measurements A method for selecting a frequency band, from among a plurality of frequency bands controllable by a radio network controller (RNC), to carry a data communication. The method may include obtaining frequency band usage measurements for a plurality of frequency bands,... | 05/22/2012 |
| 8184727 | Robust integer carrier frequency offset estimator A robust integer carrier frequency offset estimation method for OFDM systems is disclosed. Compared with conventional methods which use either two consecutive OFDM symbols or only one training symbol, the method is insensitive to the timing offset as long as the cha... | 05/22/2012 |
| 8184725 | Receiver and method for implementing timing synchronization in OFDM scheme A receiver and method of performing timing synchronization in an orthogonal frequency division multiplexing (OFDM) scheme. A receiver to perform timing synchronization in an OFDM scheme, the receiver including: an autocorrelation processor to calculate and accumulat... | 05/22/2012 |
| 8184729 | Communication processing system, OFDM signal transmitting method, OFDM transmitter, OFDM receiver, and control station In an OFDM transmitter included in a first service area, an orthogonal-code-pattern multiplication unit multiplies pilot channel signals belonging to any subcarrier group by an orthogonal code which is different from that for one or a plurality of OFDM transmitters ... | 05/22/2012 |
| 8184726 | Method and apparatus for multi-rate control in a multi-channel communication system An apparatus for data processing in a multi-channel communication system is provided. The apparatus includes an encoder configured to encode a number of bits for transmission via channels in the multi-channel communication system into coded bits and split the coded ... | 05/22/2012 |
| 8179987 | Method and device for transferring data in a multi-carrier system having parallel concatenated encoding and modulation The invention relates to a transmitter-receiver pair for improved data transmission in a multi-carrier system and to a corresponding method, according to which a chain coding is used. To this end, a transmitter has a first coding stage, a transmission-demultiplexer ... | 05/15/2012 |
| 8179988 | Cyclic redundancy in ODFM systems Method, communication system, receiver, baseband processor and computer program for recovering data from a received OFDM-signal containing recurrent redundant information where part of the recurrent redundant information is used to maximize the SINR (Signal to Inter... | 05/15/2012 |
| 8179989 | Transmission apparatus and transmission method An transmission apparatus includes a pseudo data addition section configured to add pseudo data into transmission data for a free subcarrier of a radio frequency, an OFDM modulator subjecting the transmission data added with the pseudo data to OFDM modulation, a pow... | 05/15/2012 |
| 8179985 | Method and apparatus for providing time-frequency diversity in OFDM wireless communication systems A method for transmitting signals using orthogonal frequency division multiplexing (OFDM) symbols in a wireless communication system, includes: selecting a plurality of OFDM symbols as a symbol group in time dimension; and multiplying a scrambling pattern with the s... | 05/15/2012 |
| 8179986 | Multicarrier modulation scheme as well as transmission apparatus and reception apparatus using the scheme In order is to generate a pilot signal for estimating a transmission characteristic of a transmission channel suitable for OFDM/OQAM multicarrier modulation, a phase reference pilot symbol of which a modulation amplitude is suppressed to zero, and an amplitude refer... | 05/15/2012 |
| 8175177 | Peak to average power ratio reduction The present invention is related to a method for reducing a peak to average power ratio (PAPR) of a signal in a wireless communication system. PAPR is reduced by modulating a data stream into a plurality of symbols, dividing the plurality of symbols into symbol grou... | 05/08/2012 |
| 8175178 | Orthogonal frequency division multiplexing (OFDM) communications device and method that incorporates low PAPR preamble and variable number of OFDM subcarriers A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each ot... | 05/08/2012 |
| 8175176 | FFT window spread generating method The present invention provides an FFT window spread generating method used in the modulation of an OFDM system. When OFDM-modulated received signals each having a time length greater than or equal to an effective symbol length are demodulated by FFT processing using... | 05/08/2012 |
| 8175175 | Method and system for rate-shaping and transmitting media streams A method for rate-shaping media streams; the method includes: receiving multiple input media streams, transmission parameters, wired transmission limitations and wireless transmission limitations that represent a current status of a wireless medium; and rate-shaping... | 05/08/2012 |
| 8175179 | Calculating peak-to-average power ratio reduction symbols for multi-carrier modulated signals using a gradient-descent approach In one embodiment, the present invention is a method for reducing the peak-to-average power ratio (PAPR) of a multi-carrier modulated symbol, such as an orthogonal frequency division multiplexed (OFDM) symbol. The method first transforms a set of data symbols into a... | 05/08/2012 |
| 8170127 | Receiver and method of receiving A receiver detects and recovers data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, which are transmitted as first and second versions to form a multiple input multiple output (MISO) system and carry pairs of data symbols encoded to form Alamouti cel... | 05/01/2012 |
| 8170126 | Reference signal structure for OFDM based transmissions A method for transmitting a plurality of sequences across a plurality of bands of a wireless spectrum is described in which a first sequence is produced using a set of reference signal sequences, wherein the set of reference signal sequences comprises at least CAZAC... | 05/01/2012 |
| 8165231 | Wireless communications apparatus Precoding a plurality of subcarriers in preparation for MIMO transmission is carried out by deriving preceding matrices from available information. When the number of data streams borne by the subcarriers equates to the number of transmit antennas employed in the MI... | 04/24/2012 |
| 8165232 | Low peak-to-average power ratio (PAPR) preamble for orthogonal frequency division multiplexing (OFDM) communications A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each ot... | 04/24/2012 |
| 8165233 | Multi-element antenna beamforming in a wireless access network A communication node of a wireless local area network utilizes a multi-element array antenna to estimate an angle-of-arrival for one or more signal sources which may communicate on symbol-modulated orthogonal subcarriers. Channel coefficients may be estimated from t... | 04/24/2012 |
| 8165234 | Method and system for synchronizing OFDM transmission symbols A method for synchronizing orthogonal frequency division multiplexing (OFDM) transmission symbols includes: an OFDM transmission module receives a synchronization signal, and adjusts the OFDM symbols sent by all lines to synchronous symbols according to the synchron... | 04/24/2012 |
| 8165229 | Channel estimation method and apparatus in orthogonal frequency division multiplexing system Disclosed is a channel estimation method and apparatus in an OFDM system. The method includes performing channel estimation at a pilot position of a received symbol, thereby calculating a first channel estimate, performing diagonal interpolation between the first ch... | 04/24/2012 |
| 8165230 | Doppler frequency estimation in wireless communication systems An apparatus and method for estimating Doppler frequency in a wireless communication network, wherein the method comprises determining a first correlation coefficient (c1) between a currently received Orthogonal Frequency Division Multiplexed (OFDM) symbol an... | 04/24/2012 |
| 8165227 | Method of keying for broadcast using OFDM A method of modulation, which is applied to a communication system transmitting data in one frequency band using at least two orthogonal subcarriers, is disclosed. The present invention includes the steps of adding information bits indicating an amplitude reference ... | 04/24/2012 |
| 8165237 | DTMB-based carrier mode detection system and receiving system having the same A Digital Terrestrial Multimedia Broadcasting (DTMB)-based carrier mode detection system includes first and second TPS decoders, first and second carrier calculators and a determinator. The first and second TPS decoders respectively receive NTPS input sig... | 04/24/2012 |
| 8165238 | Bi-directional communication system, communication apparatus, and control method of communication apparatus Each of two communication apparatuses in a bi-directional communication system transmits to a partner communication apparatus as an OFDM signal at a predetermined carrier frequency an OFDM symbol having a guard interval length determined in advance and an effective ... | 04/24/2012 |
| 8165236 | Human body communication method using multi-carrier modulation method Provided is a human body communication method using a multi-carrier modulation method, in which users do not interfere with each other in an environment with several users, and stable communication is possible when users are exposed to strong interference generated ... | 04/24/2012 |
| 8165228 | Non-coherent transmission method for uplink control signals using a constant amplitude zero-autocorrelation sequence In one embodiment of the instant invention, a non-coherent transmission method for uplink control signals is provided. The transmission methodology uses a constant amplitude zero-autocorrelation (CAZAC) sequence for relatively short control signal lengths. The metho... | 04/24/2012 |
| 8165235 | Interfering stream identification in wireless communication systems An exemplary embodiment in accordance with this invention is a method for determining the number of interfering streams. The method includes calculating statistical information based on one or more received OFDM signals. The number of interfering streams is estimate... | 04/24/2012 |
| 8160167 | Radio transmitting apparatus, radio receiving apparatus and method therefor By assigning a plurality of subcarriers 31 to a data channel 33 and assigning fewer subcarriers 32 than the plurality of subcarriers 31 to a control channel 34 and, in addition, locating the control channel 34 at the center ... | 04/17/2012 |
