Abstract: The method and apparatus in accordance with the present invention receives bits, writes the bits row-by-row in a matrix, reads the bits column-by-column from the matrix, groups and rotates the bits read column-by-column from the matrix so as to evenly separate the bits in position, frequency, space over one symbol period.

Abstract: A general architecture scheme to perform channel estimation on orthogonal transmissions for any number of transmitting antennas present. Generally, the channel estimation is applicable for wireless communications in a MIMO system.

Abstract: The method and apparatus in accordance with the present invention receives bits, writes the bits row-by-row in a matrix, reads the bits column-by-column from the matrix, groups and rotates the bits read column-by-column from the matrix so as to evenly separate the bits in position, frequency, space over one symbol period.

Abstract: Aspects of a method and system for detection of long pulse bin 5 RADARs in the presence of Greenfield packets are presented. In one aspect of the system, a processor in a wireless communication device may receive a plurality of pulses via a received signal. The processor may select at least a portion of the received plurality of pulses. The processor may compute a time duration value and a pulse count value based on the selected at least a portion of the received plurality of pulses. The processor may determine whether the received signal comprises a RADAR transmission signal based on the computed time duration value and the computed pulse count value when the time duration value is greater than or equal to a threshold time duration value and the pulse count value is greater than or equal to a minimum pulse count threshold value.

Abstract: Aspects of a method and system for a transmitting antenna selection failure recover mode are presented. Aspects of the system may include a transmitting mobile terminal that enables selection of a sequence of protocol data units (PDU), for example a sequence of sounding frames, which may be transmitted during an antenna selection procedure. During transmission of the selected PDU sequence, the transmitting mobile terminal may receive an antenna selection failure indication frame. The transmitting mobile terminal may enable retransmission of at least one previously transmitted PDU in the PDU sequence based on the failure indication. Transmission of subsequent PDUs in the PDU sequence may resume after the retransmission. Alternatively, upon receipt of the failure indication frame the transmitting mobile terminal may restart the selected frame sequence from the beginning, or may select a subsequent PDU frame sequence.

Abstract: Methods, apparatus, techniques and computer program products for joint reduction of crosstalk in a synchronized, time division duplexed DSL systems use sequential removal of NEXT interference followed by removal of FEXT interference from a received DSL signal. Crosstalk is removed from a primary signal in a synchronized TDD DSL system having a primary channel that carries the primary signal, at least one NEXT generating channel that generates NEXT interference in the primary signal and at least one FEXT generating channel that generates FEXT interference in the primary signal. Signal data is acquired, where the signal data includes received signal data for the primary channel and at least one FEXT generating channel, transmitted signal data for at least one NEXT generating channel, and channel data comprising channel transfer function data and crosstalk coupling coefficient data for the primary channel, each NEXT generating channel and each FEXT generating channel.

Abstract: Aspects of a method and system for choice of a steering matrix (Q) for sounding in antenna selection are presented. Aspects of the system may include a transmitting station that enables determination of values for a plurality of matrix elements, which are represented in a steering matrix (Q). The contents of the steering matrix may be determined based on the contents of a plurality of protocol data units (PDU). Each of the PDUs may comprise a sounding frame. One or more space-time signals may be generated based on the plurality of PDUs. One or more transmit chain signals may be generated by multiplying a vector representation, which comprises the one or more space-time signals, by the steering matrix. One or more transmit chain signals may be transmitted via transmitting antennas selected from a plurality of transmitting antennas.

Abstract: Aspects of a method and system for an antenna selection algorithm at the transmitter are presented. Aspects of a system for joint antenna selection may include a receiving mobile terminal that enables reception of a plurality of sounding frames via a plurality of receiving antennas. A processor may enable mapping of one of the plurality of receiving antennas to one of a plurality of received radio frequency (RF) chain signals based on the reception of the plurality of sounding frames. The receiving mobile terminal may enable transmission of antenna selection feedback information computed based on the reception of the plurality of sounding frames.

Abstract: The disclosed systems and methods achieve improved communication by periodically sending sounding packets from a transmitter; feeding back, from a receiver, the change in beamforming estimation according to reception of the sounding packets; and utilizing the change in beamforming estimation to produce transmitter beamforming.

Abstract: A general architecture scheme to perform channel estimation on orthogonal transmissions for any number of transmitting antennas present. Generally, the channel estimation is applicable for wireless communications in a MIMO system.

Abstract: Various aspects of a method for and system for multiple input multiple output (MIMO) channel estimation are presented. Aspects of a method for computing channel estimates in a radio frequency (RF) communications system may comprise decomposing a direct matrix computation into a plurality of constituent matrices, and jointly computing a plurality of channel estimates for a corresponding plurality of channel estimate streams received via a plurality of RF channels based on at least a portion of the plurality of constituent matrices. Aspects of a system for computing channel estimates in an RF communications system may comprise a receiver that decomposes a direct matrix computation into a plurality of constituent matrices, and jointly computes a plurality of channel estimates for a corresponding plurality of channel estimate streams received via a plurality of RF channels based on at least a portion of the plurality of constituent matrices.

Abstract: A transmitter having two or more transmit antennas includes a bit parser for providing two or more data streams to an interleaver of the transmitter. The bit parser receives bits representing data to be transmitted over the transmit antennas, and parses the bits into a number of data streams equal to a number of the transmit antennas such that the bits are divided into bit groups, each having no more than two of the bits, and each of the data streams include non-adjacent ones of the bit groups.

Abstract: The method and apparatus in accordance with the present invention receives bits, writes the bits row-by-row in a matrix, reads the bits column-by-column from the matrix, groups and rotates the bits read column-by-column from the matrix so as to evenly separate the bits in position, frequency, space over one symbol period.

Abstract: A method for feeding back transmitter beamforming information from a receiving wireless communication device to a transmitting wireless communication device includes a receiving wireless communication device receiving a preamble sequence from the transmitting wireless device. The receiving wireless device estimates a channel response based upon the preamble sequence and then determines an estimated transmitter beamforming unitary matrix based upon the channel response and a receiver beamforming unitary matrix. The receiving wireless device then decomposes the estimated transmitter beamforming unitary matrix to produce the transmitter beamforming information and then wirelessly sends the transmitter beamforming information to the transmitting wireless device. The receiving wireless device may transform the estimated transmitter beamforming unitary matrix using a QR decomposition operation such as a Givens Rotation operation to produce the transformer beamforming information.

Abstract: Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may comprise a receiver that may select, for a plurality of spatial streams, a modulation type and/or coding rate. The receiver may communicate a message, via an RF channel, that comprises a plurality of modulation types and/or coding rates. The receiver may configure for receiving subsequent data based on at least one selected modulation type and/or coding rate. Another aspect of the system may comprise a transmitter that may receive a message, via an RF channel, that comprises a specification of, for a plurality of spatial streams, a plurality of modulation types and/or coding rates. The system may configure for transmitting subsequent data based on at least one of the received modulation types and/or coding rates.

Abstract: A method and system for frame formats for MIMO channel measurement exchange is provided. Aspects of a method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antenna, receiving feedback information via at least one of a plurality of RF channels, and modifying a transmission mode based on the feedback information. Aspects of a method for communicating information in a communication system may also comprise receiving data via a plurality of receiving antenna, transmitting feedback information via at least one of the plurality of RF channels, and requesting modification of a transmission mode for the received data in transmitted response messages comprising the feedback information.

Abstract: Methods, apparatus and systems for identifying crosstalk interference in xDSL systems are disclosed and are useful in a variety of xDSL systems to assist in the provisioning, maintenance and diagnosis of the xDSL system and in spectral management and assignments. Signal data are collected from a receiver, a primary transmitter and any crosstalk transmitters. The signal data are resampled, if necessary. A first estimate of the timing offset between the received signal and each crosstalk signal is then obtained by cross-correlating the received data with the transmitted crosstalk data. The first timing offset estimate is then used in connection with a least-squares estimation of the crosstalk response for the considered crosstalk data and a second estimate of the timing offset. The invention may be used at a third party site remote from the system transmitters and receivers. The crosstalk identification of the present invention can be used in dynamic spectrum management for DSL services and signals.

Abstract: An arrangement of interleavers allocates bits from an input symbol across sub-symbols transmitted via sub-carriers of multiple orthogonal frequency division multiplex (OFDM) carriers. The input bits are allocated in a fashion to provide separation across subcarriers, and rotation of sub-symbols across the OFDM carriers provides additional robustness in the present of signal path impairments.

Abstract: Methods and systems for processing multiple preambles for a wireless signal are disclosed herein. Aspects of the method may comprise selecting a portion of a preamble, and shifting the selected portion of the preamble to generate a plurality of subsequent preambles. The preamble may comprise a legacy preamble and/or an 802.11(n) preamble. The selected portion of the preamble may comprise a short training sequence. The shifting may comprise circular shifting. The circular shifting may comprise forward circular shifting and/or backwards circular shifting. The generated plurality of subsequent preambles may be transmitted via a plurality of antennas. A phase roll may be added to the selected portion of the preamble to generate the plurality of subsequent preambles.

Abstract: Methods and devices for adaptively changing a parameter (such as sub-carrier bit allocation and/or gain) in a multi-carrier communication signal are described. In a method aspect, a unit that determines a need for a change sends an express change request to a second unit. The change request identifies one or more specific sub-carrier carrier to be altered and a desired value for the parameter to be changed for each identified sub-carrier. The requesting unit then monitors the communication signal it receives to determine whether the requested change has been implemented. The determination of whether the requested change has been implemented is based at least in part upon an analysis of a portion of the received communication signal that was intended to be changed. In another aspect of the invention, the change request command includes a header, a control field, at least one sub-carrier identifier, at least one desired parameter value indicator, and an error field.