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| Number | Title | Issue Date |
| 8159930 | Scalable space-frequency coding for MIMO systems Systems, devices, and techniques for MIMO (Multiple-In-Multiple-Out) based space-frequency coding can include, in at least some implementations, techniques that include receiving a selected spatial multiplexing rate M, the spatial multiplexing rate corresponding to ... | 04/17/2012 |
| 8121020 | QLM demodulation A method for deriving a bound on communications capacity with ideal quadrature layered communications QLM and a set of demodulation algorithms for QLM. Communications links using QLM can approximate this bound and support higher data rates than allowed by the Shanno... | 02/21/2012 |
| 8064326 | Mobile station, base station, communication system, and communication method A scrambler performs IQ multiplexing of output signals from a spreader and a distributor in order to generate a complex signal (I signal and Q signal), amplitude coefficients βcc(I) and βcc(Q) are determined in accordance with signal powers on I axis and Q axis. | 11/22/2011 |
| 8027243 | Allocation of radio resource in orthogonal frequency division multiplexing system An uplink capacity is increased by a method in which more than two mobile stations simultaneously use a radio resource allocated to one mobile station. A method of allocating a radio resource in an orthogonal frequency division multiplexing system comprises receivin... | 09/27/2011 |
| 8018830 | Transmission of a data stream using OFDM symbols at two carrier frequencies having overlapping superframes of a commensurable time duration In a method for transmitting a data stream in a digital transmission system, the data stream is transmitted in a transmitted signal using successive OFDM symbols; a number of OFDM symbols are combined in a transmission frame; a... | 09/13/2011 |
| 8014266 | Apparatus and method for synchronization acquisition and cell ID search in wireless communication system A apparatus and method for allocating synchronization acquisition sequence in a time domain and allocating a cell ID search sequence in a frequency domain. In a method for transmitting a synchronization signal of a base station in a wireless communication system, a ... | 09/06/2011 |
| 7995454 | 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 spectrally overlapping carrier signals from at least two of a plurality of rem... | 08/09/2011 |
| 7986612 | Communication terminal apparatus, base station apparatus and reception quality reporting method A communication terminal apparatus that can eliminate the waste of reception quality report, suppress the interference of an upstream network, perform an optimum assignment using a scheduling, prevent the loss of resources, and ensure the fairness of transmission as... | 07/26/2011 |
| 7940639 | Interference suppressing OFDM system for wireless communications An IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises an IS-OFDM transmitter and an IS-OFDM receiver, wherein a transmitted signal comprises a plurality of subcarriers, and further wherein each subcarrier con... | 05/10/2011 |
| 7916622 | Apparatus and method for allocating resources in mobile communication system Provided are an apparatus and method for allocating resources in a mobile communication system. The apparatus includes a modulating/coding unit for modulating transmission data of one or more users according to a predetermined modulation scheme and for outputting a ... | 03/29/2011 |
| 7881181 | 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... | 02/01/2011 |
| 7876670 | Method for transmitting data, method for receiving data, transmitter, receiver, and computer program products A method for transmitting data comprising a plurality of bits is described wherein the data is mapped to a plurality of modulation symbols, each modulation symbol comprising at least one more significant bit and at least one less significant bit, at least one parity... | 01/25/2011 |
| 7872962 | System and method for producing weighted signals in a diversity communication system The disclosed technology relates to a communication system and method in which multiple versions of a signal are processed to detect the signal. The communication system can include transmitters that communicate different versions of a signal to a receiver. The diff... | 01/18/2011 |
| 7872961 | Orthogonal frequency division multiple access message processing method and apparatus A base station receives (201) OFDMA messages from a plurality of end user platforms that share all used tones within at least one OFDMA symbol. By one approach this base station then uses (202) a fixed starting time to select contiguous samples from re... | 01/18/2011 |
| 7852745 | Non-orthogonal frequency-division multiplexed communication through a non-linear transmission medium A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium includes the steps of selecting at least one desired bandwidth, selecting a non-orthogonal pair of base frequencies within a first bandwidth of the at l... | 12/14/2010 |
| 7843802 | Method for uplink multiuser OFM with constrained inputs A method setting a maximum number of determinations for computing power allocation responsive to allocating power among multiple users in one subchannel of an OFDM system; beginning determination of maximum sum-throughput of users in the OFDM system with a randomly ... | 11/30/2010 |
| 7826341 | Methods and systems for implementing a pseudo-noise signaling mechanism in wireless communication In at least some embodiments, a system may comprise one or more devices configurable to communicate according to a first protocol that implements a first data packet, and one or more devices configurable to communicate according to a second protocol that implements ... | 11/02/2010 |
| 7821914 | Method of generation and set of implementation efficient preambles for OFDM systems In one embodiment, a network node includes a lookup table configured to store one or more of the following frequency domain bit sequences: i) x010101000110xxxxxxx011000000000; ii) x1011000111000000011011110xxxxxxxxxxxxx0110111001101001010111010; iii) x00110110111110... | 10/26/2010 |
| 7821913 | Method and apparatus for data and pilot structures supporting equalization Techniques for transmitting data in a manner to facilitate equalization at a receiver are described. Guard intervals are appended to data blocks such that each data block has a guard interval at the beginning of the data block and a guard interval at the end of the ... | 10/26/2010 |
| 7808882 | Method and system for optimized reference signal downlink transmission in a wireless communication system A method and system optimizes the transmission of a downlink reference signal (DLRS) in a wireless communication system that uses orthogonal division multiple access (OFDMA) for the downlink. Each Node-B (base station) is capable of transmitting the DLRS reference s... | 10/05/2010 |
| 7787356 | Method and apparatus for indexing physical channels in an OFDMA system A method and system for indexing physical channels in an OFDMA system where one OFDM symbol includes a plurality of subcarriers and one TTI includes a plurality of OFDM symbols are provided. A total number of subcarriers per OFDM symbol are divided into N groups. A ... | 08/31/2010 |
| 7782750 | Radio communication method, radio communication system, radio communication base station, radio communication terminal station, and radio communication program A radio communication method for exchanging information between a base station and a terminal station. The method includes: communicating the information between the base station and the terminal station by multi-carrier signals by OFDM modulation scheme including p... | 08/24/2010 |
| 7782751 | Systems and methods for computing a relative path delay between multiple transmission sources Systems and methods are provided for computing a relative path delay between multiple transmitting source to select a source that is closest to a receiving device. Preamble sequences unique to each source are received by a receiving device. The receiving devices det... | 08/24/2010 |
| 7773499 | Channel estimation in a multicarrier radio receiver A method and apparatus for estimating channel characteristics in a multicarrier wireless receiver such as an OFDM wireless receiver. The method includes determining a channel estimate for each of a set of subcarriers by receiving multicarrier data as a result of a w... | 08/10/2010 |
| 7773500 | Transmitting apparatus for transmitting in a multi-carrier system using multiple antennas and receiving apparatus in the same system A transmitting apparatus and receiving apparatus of a multi-carrier system using multiple antennas is proposed. A linear complex field (LCF) encoder performs linear precoding of input signals to be transmitted using a linear complex matrix based on the number of ant... | 08/10/2010 |
| 7756001 | Apparatus and method of deciding received symbol in M-PSK system An apparatus for and method of deciding symbols in a M-ary phase shift keying (MPSK) system are provided. The apparatus includes: a linear transform unit performing linear transform, to which a phase error is applied, of a received pair of symbols; and a symbol deci... | 07/13/2010 |
| 7746760 | Frequency error estimation and frame synchronization in an OFDM system Frequency error estimation and frame synchronization are performed at a receiver in an OFDM system based on a metric that is indicative of detected pilot power. The metric may be defined based on cross-correlation between two received symbols obtained in two OFDM sy... | 06/29/2010 |
| 7746761 | Techniques to generate constant envelope multicarrier transmission for wireless networks Various example embodiments are disclosed herein. According to an example embodiment, an apparatus for use in a wireless transmitter may include a continuous phase modulation (CPM) sample generator configured to generate a group of constant envelope CPM modulated si... | 06/29/2010 |
| 7733764 | Method and system for dynamically reducing length of a delay chain Upon a triggering event, a delay chain shifts data out at a higher rate than incoming packets and a processor controls bypassing circuitry to reduce the latency of hardware implementations of, for example, 802.11a OFDM receivers, with long delay chains. The signal p... | 06/08/2010 |
| 7710856 | Methods and systems for implementing a pseudo-noise signaling mechanism in wireless communication In at least some embodiments, a system may comprise one or more devices configurable to communicate according to a first protocol that implements a first data packet, and one or more devices configurable to communicate according to a second protocol that implements ... | 05/04/2010 |
| 7697410 | Centralized buffer architecture for an orthogonal frequency division multiplexing (OFDM) receiver The disclosed embodiments relate to a centralized buffer architecture for an Orthogonal Frequency Division Multiplexing (OFDM) receiver. In this architecture, a central buffer is shared by the main functional blocks or modules of the OFDM receiver. A state machine e... | 04/13/2010 |
| 7684310 | Preamble for identifying mobile stations in a wireless communication network Techniques and apparatus for identifying the target mobile stations for data transmission in a wireless communication network. Techniques and apparatus can include generating a first N-symbol bi-orthogonal sequence from Walsh functions based on a first portion of a ... | 03/23/2010 |
| 7675843 | Multipoint-to-point communication using orthogonal frequency division multiplexing A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system is provided. In one embodiment, a system includes: a host unit including a demodulator that simultaneously demodulates upstream information modulated on a plurality of tones... | 03/09/2010 |
| 7649832 | Wireless communication method using OFDM, OFDM receiving method and apparatus thereof A receiving method receiving an OFDM signal including a first OFDM symbol having first and second pilot signals allocated to first and second subcarriers positioned symmetric on the frequency axis, and a second OFDM symbol having third and fourth pilot signals alloc... | 01/19/2010 |
| 7630290 | Interference suppressing OFDM system for wireless communications An IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises an IS-OFDM transmitter and an IS-OFDM receiver, wherein a transmitted signal comprises a plurality of subcarriers, and further wherein each subcarrier con... | 12/08/2009 |
| 7623441 | Scalable space-frequency coding for MIMO systems A transceiver in an N×N MIMO (Multiple-In-Multiple-Out) system includes a mode selection module to select a spatial multiplexing rate and a coding module to space frequency code OFDM (Orthogonal Frequency Division Multiplexing) symbols in response to the selected s... | 11/24/2009 |
| 7583584 | System and method for time diversity A system and method for time diversity uses interleaving. To simplify the operation at both transmitters and receivers, a formula can be used to determine the mapping from slot to interlace at a given OFDM symbol time. ... | 09/01/2009 |
| 7577085 | Multicarrier transmit diversity Method, apparatus, and data packet format to implement transmit diversity in a multicarrier environment is disclosed. For diversity transmission operations, space frequency encoding techniques are employed creating distinguishable first and second time domain signal... | 08/18/2009 |
| 7570578 | Orthogonal frequency division demodulator, method and computer program product An OFDM demodulator that demodulates an OFDM signal includes an antenna that receives a signal including delayed signals, an estimation circuit that estimates the channel response of the received signal, and a control circuit that controls a length of a retention ti... | 08/04/2009 |
| 7551545 | Subband-based demodulation for an OFDM-based communication system For subband-based OFDM demodulation, a “partial” Fourier transform is performed on a sequence of N input samples for an OFDM symbol to obtain Nc received symbols for a group of Nc data subbands, where Nc·L=N and L>1. For the par... | 06/23/2009 |
