Reduced complexity sliding window based equalizer

A wireless transmit/receive unit (WTRU) comprising:

• a plurality of receive antennas;
• a sampling device configured to sample wireless signals received on each antenna at a multiple of a signal chip rate and to produce a received vector at the sampling rate for each receive antenna;
• a processing circuit configured to produce a channel response matrix for each antenna;
• the processing circuit configured to process each received vector using a sliding window based approach, where a plurality of successive windows are processed;
• the processing circuit configured to process each window of the plurality of windows:
• to produce a combined circulant channel response matrix using the channel response matrices;
• and
• to use the combined circulant channel response matrix and a combined received vector comprising each received vector in a discrete Fourier transform based approach for estimating a data vector corresponding to that window;
• and
• the processing circuit configured to combine the data vector estimated in each window to form a combined data vector.