METHOD AND SYSTEM FOR AN ALTERNATING DELTA QUANTIZER FOR LIMITED FEEDBACK MIMO PRE-CODERS

摘要

Aspects of a method and system for an alternating delta quantizer for limited feedback MIMO pre-coders may comprise quantizing a change in channel state information in a MIMO pre-coding system onto at least a first and a second codebook, each of which comprises one or more unitary matrices, using a cost function; feeding back, in an alternating manner, an index to an element of at least the first codebook or the second codebook, associated with the quantizing, from a receiver to a transmitter in said MIMO pre-coding system, and generating the at least first and second codebook based on at least the channel state information. The channel state information may be a matrix V and the cost function may be defined by the following relationship: $f\left(A\right)=\left(\frac{1}{N}\sum _{j=1}^N{a_{\mathrm{jj}}}^2\right)$ where A is a matrix of size N by N and a_ij is element (i,j) of matrix A.