Patent
Apparatus, method and computer program product providing closed loop transmit antenna operation for systems using multiple antennas
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TLDR
In this paper, a method for determining weights corresponding to each of a plurality of antennas used to transmit data signals, each weight suitable to modify a corresponding one of the data signals prior to transmission using a corresponding antenna, was proposed.Abstract:
A method includes determining weights corresponding to each of a plurality of antennas used to transmit data signals, each weight suitable to modify a corresponding one of the data signals prior to transmission using a corresponding one of the antennas; and transmitting information corresponding to at least one of the weights, the information allowing at least the at least one weight to be determined. Another method includes receiving information corresponding to at least one of a plurality of weights, the plurality of weights corresponding to a plurality of first antennas used to transmit first data signals, where each weight was used to modify a corresponding one of the first data signals prior to transmission using a corresponding one of the first antennas; using the received information, determining the plurality of weights corresponding to the plurality of first antennas; and using at least the plurality of weights; and decoding second data signals received using a plurality of second antennas to create at least one output signal.read more
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TL;DR: In this article, a receiver estimates a fading channel of received data, selects a weight set relative to a maximum data transmission rate from at least one weight set with elements of a plurality of orthogonal weight vectors, and transmits feedback information including the selected weight set and channel-by-channel state information to a transmitter.
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References
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Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
TL;DR: In this paper, a successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams for each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams.
Patent
Method and apparatus for multi-antenna transmission
TL;DR: In this article, a method and apparatus for multi-antenna transmission in a multiple-input, multiple-output (MIMO) communication system, a method that reduces the number of transmit weight matrices is presented, where each transmit weight matrix is applied to a plurality of subcarriers.
Patent
Frequency-independent spatial processing for wideband MISO and MIMO systems
TL;DR: In this paper, a correlation matrix is computed for a MIMO channel based on channel response matrices and decomposed to obtain NS frequency-independent steering vectors for NS spatial channels of the MISO channel.
Patent
Space-time processing for multiple-input, multiple-output, wireless systems
TL;DR: In this paper, the channel properties used to determine the weight vectors may include the channel response from the transmitter to the receiver and the covariance matrix of noise and interference measured at the receiver.
Patent
Method and apparatus for feedback error detection in a wireless communications systems
TL;DR: In this article, an error in closed loop transmit diversity (CLTD) feedback signaling was detected and/or corrected by a mobile station, according to aspects of the present invention, based on signals received from a base station.