Patent ID: 7386033

Claim:
A wireless transmit/receive unit (WTRU) configure to receive and sample wireless signals in a shared spectrum where the wireless signals comprise encoded symbols, the WTRU comprising: a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H; said channel estimation device further configured to process the received signal samples to produce an estimate of noise variance σ 2 of the received signals; a two stage data estimator comprising a first stage channel equalizer and a second stage despreader; said channel equalizer configured to process the received signal samples using the estimated channel response matrix H and the estimate of noise variance σ 2 to produce a spread signal estimate of the received signals such that: codes of the received signals are processed using a block Fourier transform (FT) to produce a code block diagonal matrix; the estimated channel response matrix H is extended and modified to produce a channel response block diagonal matrix; the code block diagonal matrix and the channel response block diagonal matrix are combined; the received signal samples are processed using the combined code block diagonal matrix and the channel response block diagonal matrix with the noise variance σ 2 and a Cholesky algorithm; and a block inverse FT is performed on a result of the Cholesky algorithm to produce the spread signal estimate of the received signals; and said despreader configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover the encoded symbols of the received signals.