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| Number | Title | Issue Date |
| 8189453 | Method of OFDM communication using superposition coding Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In... | 05/29/2012 |
| 8189454 | Multi-band OFDM communications system A method for providing communication in a wireless network comprising one or more simultaneously operating pico networks includes dividing UWB spectrum into a plurality of frequency bands. These bands are formed into band groups. At least one band group is assigned ... | 05/29/2012 |
| 8179776 | OFDM transmission/reception apparatus Modulation section 201 performs modulation processing on transmission data. Mapping control section 202 controls mapping of the baseband signal onto the subcarriers so that the important information conventionally transmitted by one subcarrier is trans... | 05/15/2012 |
| 8179777 | Transmitter and receiver for a wireless access system, transmission method and reception method of the wireless access system, and a program for same An arithmetic process of a quadratic formula that is contained in an exponent of a CAZAC sequence-defining expression is converted to an arithmetic process of a recursion formula to find the above-described exponent, the above-described exponent that was found is us... | 05/15/2012 |
| 8179775 | Precoding matrix feedback processes, circuits and systems An electronic device includes a first circuit (111) operable to generate a precoding matrix index (PMI) vector associated with a plurality of configured subbands, and further operable to form a compressed PMI vector from the PMI vector wherein the compressed ... | 05/15/2012 |
| 8174955 | Random access preamble coding for initiation of wireless mobile communications sessions A wireless communications network, including a base station (10) and wireless units (UE), is disclosed. The wireless units (UE) request a connection with the base station (10) by the transmission of a preamble within time slots designated by the base s... | 05/08/2012 |
| 8169887 | Apparatuses and methods for wireless communications using a permutation sequence A method for data transmissions in a wireless communication system includes: allocating resources for data to be transmitted; providing a seed number from the communication system; setting, based on the seed number, at least one parameter for a pseudo-random mapper ... | 05/01/2012 |
| 8169885 | Method and apparatus for optimization of wireless mesh networks A cross-layer optimization framework for designing of multi-radio/multi-channel wireless mesh networks with network coding to support multiple unicast applications is used. A column-generation-based primal-dual method is used to solve the optimization problem. For n... | 05/01/2012 |
| 8169886 | Code division multiple access based contingency transmission Systems (100) and methods (500) for method for providing a redundant or distinct transmission feature to a communication system (100). The methods involve (508) detecting if there is a communication system fault. If a communication system... | 05/01/2012 |
| 8159928 | Signal transmission in a wireless communication system Interference management is provided through use of a user-based interference control and/or a network-based interference control. For user-based interference control, the terminals are informed of the inter-sector interference observed by the neighbor sectors and ca... | 04/17/2012 |
| 8159929 | Low complexity high performance TMCC acquisition in ISDB-T and ISDB-TBS receivers A method of TMCC information acquisition in an ISDB-T/TSB receiver comprises detecting coarse frequency offset in the receiver to identify bins that have TMCC information; and acquiring TMCC and symbol number information from the identified bins. The detecting proce... | 04/17/2012 |
| 8144570 | Apparatus, method and computer program product providing multiplexing for data-non-associated control channel A method is provided for block spreading individual control symbol sequences, mapping the block spread control symbol sequences, adding a cyclic prefix to the block spread control symbol sequences to form a data-non-associated control signaling information, and tran... | 03/27/2012 |
| 8139471 | Apparatus and method for clock synchronization in a multi-point OFDM/DMT digital communications system A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timin... | 03/20/2012 |
| 8134910 | Method and apparatus for multiplexing and demultiplexing asynchronous bitstreams Provided is a method and apparatus for multiplexing bitstreams that are coded to have different frame lengths using asynchronous time alignment, in which, based on the length of each frame of a bitstream selected as a reference bitstream from among bitstreams coded ... | 03/13/2012 |
| 8134912 | Apparatus, systems and methods adapted for opportunistic forwarding of uplink short messages in wireless metropolitan area networks An embodiment of the present invention provides an apparatus, comprising a subscriber station (SS) operable to communicate with a base station (BS) and at least one additional subscriber station (SS) in a wireless metropolitan area network, wherein the at least one ... | 03/13/2012 |
| 8134911 | OFDM-based device and method for performing synchronization in the presence of interference signals An OFDM-based device and method for performing synchronization utilizes a time-domain preamble of an incoming OFDM-based signal to compute an estimated fine frequency offset. The computation of the estimated fine frequency offset involves multiplying values of the t... | 03/13/2012 |
| 8130629 | Simultaneous simulcast and single cast hybrid multi-tone communication system Methods and systems for simultaneous transmission of simulcast and single cast information over a hybrid point to multipoint communication systems, including the steps of: selecting an area to be ubiquitously covered by a common channel; assigning a first wireless c... | 03/06/2012 |
| 8125883 | OFDM in fast fading channel Detection of OFDM symbols generates an equivalent vector which represents the sufficient statistics (SS) which are subsequently processed using a maximum likelihood (ML) algorithm. The algorithms and implementations are described. Both examples of implementation usi... | 02/28/2012 |
| 8125885 | Frequency offset estimation in orthogonal frequency division multiple access wireless networks A method of wireless transmission for estimating the carrier frequency offset in a base station of a received transmission from a user equipment (UE) accessing a radio access network. The method time de-multiplexes selected symbols of a received sub-frame, computes ... | 02/28/2012 |
| 8125884 | Apparatus for pre-coding using multiple codebooks and associated methods A communication system includes a transmitter. The transmitter transmits information by using a plurality of pre-coding codebooks. ... | 02/28/2012 |
| 8121018 | Signal transmitting method, signal receiving method and signal receiving device in OFDM system A signal transmitting method, a signal receiving method, and a signal receiving device are adapted to an OFDM system. In the signal transmitting method and signal receiving method, double asymmetric training symbols are used for performing time-varying channel respo... | 02/21/2012 |
| 8121017 | Frame and signaling pattern structure for multi-carrier systems A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame including at least two signalling patterns adjacent to each other in the frequency direction and at least two data patterns, the transmitting ap... | 02/21/2012 |
| 8102754 | Synchronization time difference measurements in OFDM systems Disclosed herein are methods and devices for determining a received time difference between a first OFDM signal received from a first base station and a second OFDM signal received from a second base station. The methods and apparatus disclosed herein may be applied... | 01/24/2012 |
| 8098567 | Timing adjustments for channel estimation in a multi carrier system Apparatus and methods are provided for making timing adjustments in a multi carrier communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes adjusting the time basis of two or more pilot interlaces with re... | 01/17/2012 |
| 8089853 | 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 receive a waveform comprising a plurality of spectrally overlapping carrier signals from at least two of a p... | 01/03/2012 |
| 8085652 | Communication systems A transmission method for use in a multi-hop wireless communication system is provided. The system includes a source apparatus, a destination apparatus and two or more intermediate apparatuses. The system has access to a time-frequency format for use in assigning av... | 12/27/2011 |
| 8077591 | Combined OFDMA preamble index identification, integer frequency offset estimation, and preamble CINR measurement A wireless signal processor for use in identifying a maximum Carrier to Noise Interference Ratio (CINR) associated with a plurality of received OFDMA subcarriers has a candidate generator for forming a plurality of candidate values from a particular set of received ... | 12/13/2011 |
| 8068407 | Group MMSE-DFD with order and filter computation for reception on a cellular downlink The present method resides in a user destination receiver to exploit the structure of the transmitted signals to design filters that yield improved performance. Moreover, the computational cost of designing these filters can be reduced and the demodulation complexit... | 11/29/2011 |
| 8064325 | Concurrent frequency-sharing multi-user communication system with rate allocation approach According to example embodiments for use in a communication system that is adapted to permit the users to transmit data simultaneously via shared frequency and spatial resources, an allocation of user transmission rates involves setting and maintaining the transmiss... | 11/22/2011 |
| 8059524 | Allocation and logical to physical mapping of scheduling request indicator channel in wireless networks A method for allocating resources for a scheduling request indicator (SRI) is disclosed. An SRI cycle period for use by user equipment (UE) within a cell is transmitted from a NodeB in a cell to UE within the cell. The NodeB transmits a specific SRI subframe offset ... | 11/15/2011 |
| 8054739 | Method and apparatus for transmitting signals, and method and apparatus for receiving the signals A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but ac... | 11/08/2011 |
| 8040787 | Method and/or system for reduction of PAPR Methods and/or systems for reducing peak-to-average-power ratio (PAPR) may utilize rotation among transmit channels and/or inversion of polyphase sequences of sub-blocks of an orthogonal frequency-division multiplex (OFDM) sequence in a multi-input multi-output (MIM... | 10/18/2011 |
| 8018829 | Method and apparatus for OFDM based on 3D signal constellation Provided is an orthogonal frequency division multiplexing (OFDM) apparatus using a 3-dimensional (3D) signal constellation. The apparatus performs 2D inverse fast Fourier transform on a set of 3D subchannel signals that is mapped by a signal constellation including ... | 09/13/2011 |
| 8018828 | Near ML decoding method based on metric-first search and branch length threshold In this invention, we propose a near maximum likelihood (ML) method for the decoding of multiple input multiple output systems. By employing the metric-first search method, Schnorr-Euchner enumeration, and branch length thresholds in a single frame systematically, t... | 09/13/2011 |
| 8014265 | Eigen-beamforming for wireless communication systems Techniques for sending multiple-input multiple-output (MIMO) transmissions in wireless communication systems are described. In one design, a transmitter sends a first reference signal via a first link, e.g., a cell-specific reference signal via the downlink. The tra... | 09/06/2011 |
| 8014264 | Methods and apparatus for communication with time-division duplexing Methods and apparatus for an adaptable frame structure are disclosed, where a transmission frame consists of multiple subframes, each containing a downlink transmission period and an uplink transmission period. A downlink broadcasting signal is used to indicate the ... | 09/06/2011 |
| 8009549 | Carrier allocation method in multi cell orthogonal frequency division multiple access system Provided is a carrier allocation method in a multi cell OFDMA system capable of improving the system capacity and the bit error rate performance. In the method, a user terminal U which has received broadcast information (S101) uses an empty carrier to transmi... | 08/30/2011 |
| 8000220 | Digital data transmitting apparatus and digital data receiving apparatus To provide a digital data transmitting apparatus and a digital data receiving apparatus that can realize, even when a transmission channel characteristic changes because of aged deterioration or the like of a relay, improvement of a reception performance following t... | 08/16/2011 |
| 7995453 | Orthogonal code division multiplexing for twisted pair channels A plurality of data signals are separated into parallel bit streams with each parallel stream having a bandwidth characteristic such that the combined cumulative effect of all the individual bandwidths produces a spectral characteristic of the data signals that matc... | 08/09/2011 |
| 7990839 | Method for estimating time and frequency offset in an OFDM system A receiver that employs inherent characteristics of frequency domain representation of the data symbols. By computing a differential-in-frequency function across a large number of OFDM tones, robust estimates of time and frequency offset are obtained. The obtained t... | 08/02/2011 |
