Subspace based multiuser detector algorithms

New multiuser detector algorithms are developed for very high speed wireless CDMA networks. In wireless terrestrial channels required to support broadband applications like video and digital television, multipaths with long delays might hamper the reception. This is in addition to the interference between multiple users with varying signal strengths. However, the wireless terrestrial channel is sparse. The multiuser detector developed here is of the decision feedback topology. In this paper, a subspace based approach is employed, on this decision feedback topology, to exploit the sparseness of the wireless terrestrial channel as well as the difference in users´ signal strengths. Selective updating of forward detector taps and feedback detector taps (from other users) will be employed by the base station, in the detection process. The algorithm results in superior convergence speed and lower steady state mean squared error