Abstract: A system and method for iteration scheduling in joint equalization and turbo decoding are provided. A method for processing received information includes cancelling interference in a received signal bearing received information, decoding the interference cancelled received signal to produce information, and processing the received information. The cancelling comprises an iterative processing of the received signal based on soft information produced by a decoding the received signal.

Abstract: A system and method for employing six-bit rank 1 and 2 codebooks for four transmit antennas is provided. A method for communications device operation includes estimating a communications channel between the communications device and a controller serving the communications device, thereby producing a channel estimate, quantizing the channel estimate using a codebook, thereby producing a selected codeword, and transmitting an index corresponding to the selected codeword from the codebook to the controller. The codebook includes a plurality of first level codewords, with each first level codeword having a plurality of subsidiary codewords. The quantizing is a search of only the first level codewords followed by a search of a subset of the plurality of subsidiary codewords, and the codebook is based on a rank of communications between the communications device and the controller.

Abstract: A system and method for employing a six-bit rank 1 codebook for four transmit antennas is provided. A method for communications device operation includes estimating a communications channel between the communications device and a controller serving the communications device, thereby producing a channel estimate, quantizing the channel estimate using a codebook, thereby producing a selected codeword, and transmitting an index corresponding to the selected codeword from the codebook to the controller. The codebook includes a plurality of first level codewords, and each first level codeword includes a plurality of subsidiary codewords.

Abstract: A system and method for power control in distributed networks is provided. A method for transmitting information includes setting a transmit power level for a subset of communications controllers in a communications network, and transmitting information to a communications device served by a communications controller. The subset of communications controllers includes ad hoc communications controllers in the communications network, and the setting of the transmit power level is performed in a distributed manner. The information is transmitted at a transmit power level set for the communications controller.

Abstract: A system and method is provided for employing six-bit rank 1 and 2 codebooks for multiple transmit antennas. A channel estimate is generated for a communications channel that can be established between a communications device and a controller serving the communications device. The channel estimate can be quantized using a codebook to produce a selected codeword. An index corresponding to the selected codeword can be transmitted to the controller. The codebook can include a plurality of first level codewords, with each first level codeword having a plurality of subsidiary codewords. The quantizing can be in the form of a search of the first level codewords followed by a search of a subset of a plurality of subsidiary codewords, and the codebook can be derived at least in part from a rank of communications between the communications device and the controller.

Abstract: A system and method for signaling and detecting in wireless communications systems are provided. A method for processing information includes operating in a first phase, and operating in a second phase in response to determining that a first user is transmitting at a substantially higher power level than a second user, and processing the detected information. The first phase includes iteratively inverting a first filtering operation on received signals, and the second phase includes iteratively inverting a second filtering operation on received signals with consideration given to a first estimation error of symbols of the first user and a second estimation error of symbols of the second user. The operating remains in the first phase in response to determining that the first user is not transmitting at a substantially higher power level than the second user.

Abstract: The generation of per stream Channel Quality Information (CQI) in a Multiple-Input Multiple-Output (MIMO) wireless communication system is provided. An apparatus includes a receiver for receiving signals from a transmitting end via a plurality of antennas; an estimator for estimating channels per antenna in relation with the transmitting end using the received signals and constituting a channel matrix; and a generator for deriving per stream effective noise when a lattice reduction scheme is adopted and generating per stream CQI using the per stream effective noise. Thus, feedback information for a Closed Loop (CL) MIMO system can be produced by generating the per stream CQI using the effective noise obtained through the lattice reduction.

Abstract: A system and method for iteration scheduling in joint equalization and turbo decoding are provided. A method for processing received information includes cancelling interference in a received signal bearing received information, decoding the interference cancelled received signal to produce information, and processing the received information. The cancelling comprises an iterative processing of the received signal based on soft information produced by a decoding the received signal.

Abstract: A system and method is provided for employing six-bit rank 1 and 2 codebooks for multiple transmit antennas. A channel estimate is generated for a communications channel that can be established between a communications device and a controller serving the communications device. The channel estimate can be quantized using a codebook to produce a selected codeword. An index corresponding to the selected codeword can be transmitted to the controller. The codebook can include a plurality of first level codewords, with each first level codeword having a plurality of subsidiary codewords. The quantizing can be in the form of a search of the first level codewords followed by a search of a subset of a plurality of subsidiary codewords, and the codebook can be derived at least in part from a rank of communications between the communications device and the controller.

Abstract: A system and method for power control in distributed networks is provided. A method for transmitting information includes setting a transmit power level for a subset of communications controllers in a communications network, and transmitting information to a communications device served by a communications controller. The subset of communications controllers includes ad hoc communications controllers in the communications network, and the setting of the transmit power level is performed in a distributed manner. The information is transmitted at a transmit power level set for the communications controller.

Abstract: An apparatus and method for supporting distortionless vector perturbation in a Multi-Input Multi-Output (MIMO) system are provided. The apparatus includes a transmitter for supporting distortionless vector perturbation in a MIMO system. The transmitter includes a label inserter for generating a label and for inserting the label into a user information bit, a scrambler for scrambling the user information bit inserted with the label and for generating N independent candidate sequences, a modulator for modulating the N independent candidate sequences according to a modulation scheme and a vector perturbation unit for adding a limited offset vector so that the modulated symbols are mapped to a constellation point in a feasible region. The apparatus and method provide vector perturbation with improved performance and reduced computational complexity.

Abstract: A system and method for employing six-bit rank 1 and 2 codebooks for four transmit antennas is provided. A method for communications device operation includes estimating a communications channel between the communications device and a controller serving the communications device, thereby producing a channel estimate, quantizing the channel estimate using a codebook, thereby producing a selected codeword, and transmitting an index corresponding to the selected codeword from the codebook to the controller. The codebook includes a plurality of first level codewords, with each first level codeword having a plurality of subsidiary codewords. The quantizing is a search of only the first level codewords followed by a search of a subset of the plurality of subsidiary codewords, and the codebook is based on a rank of communications between the communications device and the controller.

Abstract: A system and method for employing a six-bit rank 1 codebook for four transmit antennas is provided. A method for communications device operation includes estimating a communications channel between the communications device and a controller serving the communications device, thereby producing a channel estimate, quantizing the channel estimate using a codebook, thereby producing a selected codeword, and transmitting an index corresponding to the selected codeword from the codebook to the controller. The codebook includes a plurality of first level codewords, and each first level codeword includes a plurality of subsidiary codewords.

Abstract: The generation of per stream Channel Quality Information (CQI) in a Multiple-Input Multiple-Output (MIMO) wireless communication system is provided. An apparatus includes a receiver for receiving signals from a transmitting end via a plurality of antennas; an estimator for estimating channels per antenna in relation with the transmitting end using the received signals and constituting a channel matrix; and a generator for deriving per stream effective noise when a lattice reduction scheme is adopted and generating per stream CQI using the per stream effective noise. Thus, feedback information for a Closed Loop (CL) MIMO system can be produced by generating the per stream CQI using the effective noise obtained through the lattice reduction.

Abstract: An apparatus and method for supporting distortionless vector perturbation in a Multi-Input Multi-Output (MIMO) system are provided. The apparatus includes a transmitter for supporting distortionless vector perturbation in a MIMO system. The transmitter includes a label inserter for generating a label and for inserting the label into a user information bit, a scrambler for scrambling the user information bit inserted with the label and for generating N independent candidate sequences, a modulator for modulating the N independent candidate sequences according to a modulation scheme and a vector perturbation unit for adding a limited offset vector so that the modulated symbols are mapped to a constellation point in a feasible region. The apparatus and method provide vector perturbation with improved performance and reduced computational complexity.