Patent ID: 6937644
Filing Date: 2005-08-30
Classification: H04B,H04L

Abstract:
1. A method for recovering symbols from signals received in a shared spectrum, the method comprising: processing codes of the signals received in the shared spectrum using a block Fourier transform (FT) and producing a code block diagonal matrix; estimating a channel response of the received signals; extending and modifying the channel response to produce a block circulant matrix and taking a block FT and producing a channel response block diagonal matrix; combining the code block diagonal matrix and the channel response block diagonal matrix; sampling the received signals; processing the received signals using the combined code block diagonal matrix and the channel response block diagonal matrix with a Cholesky algorithm; performing a block inverse FT on a result of the Cholesky algorithm to produce spread symbols; and despreading the spread symbols to recover symbols of the received signals.