An Improved Group-Blind Adaptive Receiver Under Multi-path Channel

This paper proposes a improved GSC (generalized sidelobe canceller) receiver structures based on a new group constraint, which is suitable to eliminate multiple-access interference (MAI), inter-symbol interference (ISI) in direct-sequence code-division multiple access (DS/CDMA) downlink multi-user system. A new group constraint that is used to construct the group-blind adaptive multi-user detector is deduced. Analysis indicates that improved GSC with new constraint not only retains the property of suppressing ISI and canceling MAI, but also can extract the useful information from the succeeding bit for the desired user. Simulations show that improved GSC filter can cancel the MAI efficiently whether the wireless channel length is short or long, and has better performance than compared other filters.