Structured MMSE equalization for synchronous CDMA with sparse multipath channels

S. Chowdhury, M.D. Zoltowski, J.S. Goldstein
2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221)  
We present chip-level MMSE equalizers for the forward link in CDMA that exploit the underlying channel structure, specifically the fact that the channel impulse response is sparse. The assumption we make is that the channel vector lies in the subspace associated with the pulse shaping filter convolution matrix. We can then project the chiplevel MMSE equalizers onto a much lower dimensional subspace due to the sparseness of the channel. The simulations demonstrate that this low-rank MMSE
more » ... w-rank MMSE equalizer converges very quickly to the asymptotic SINR, even where the underlying assumption is not valid.
doi:10.1109/icassp.2001.940410 dblp:conf/icassp/ChowdhuryZG01 fatcat:3b5mnmv7n5a3njw4uoyodf2dt4