Multi-user detection using equalization and successive interference cancellation

A wireless transmit/receive unit (WTRU) comprising:

• an antenna configured to receive a signal in a shared spectrum;
• a sampling device configured to produce samples of the received signal as a received vector;
• a segmentation device configured to segment the received vector into a plurality of vector segments, wherein each segment has a portion overlapping with another segment and the overlapping portion includes at least one chip less than twice a channel impulse response length;
• a equalization and successive interference canceller configured to successively determine for each vector segment symbols for a plurality of communications by determining symbols for a communication in the plurality of communications, ordering the communications by received power and removing a contribution of the communication from the vector segment, wherein the equalization and successive interference canceller is configured to determine the symbols by equalizing an input vector corresponding to a segment of the received vector using fast Fourier transform;
• and
• a segment reassembly device configured to assemble the determined symbols into a data vector for each communication in the plurality of communications.