Abstract
A codebook C is provided in a MIMO transmitter as well as a MIMO receiver. The codebook C will include M codewords ci, where i is a unique codeword index for each codeword ci. Each codeword defines weighting factors to apply to the MIMO signals, and may correspond to channel matrices or vectors to apply to the MIMO signals prior to transmission from the respective antennas of the MIMO transmitter. The present invention creates codeword subsets Si for each codeword ci of the codebook C. Each codeword subset Si defines L codewords cj, which are selected from all the codewords ci in the codebook C. The codewords cj in a codeword subset Si are the L codewords in the entire codebook that best correlate with the corresponding codeword ci.
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Technologies
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Claim
1. A method of providing feedback from a wireless receiver, the method comprising, at the wireless receiver:
selecting a first codebook index; transmitting, at a first time, first feedback comprising the first codebook index; selecting a first subset index, wherein the first subset index is selected from a first subset of codebook indices corresponding to the first codebook index, wherein the first subset index of the first subset of codebook indices corresponds to a set of weighting factors to be applied to multiple input multiple output (MIMO) signals by an orthogonal frequency division multiplexing (OFDM) wireless transmitter; transmitting, at a second time, second feedback comprising the first subset index; determining whether to transmit a second codebook index or a second subset index, wherein the second subset index is selected by the wireless receiver from the first subset of codebook indices corresponding to the first codebook index; and transmitting, at a third time, third feedback comprising one of the second codebook index or the second subset index.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
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