Iterative demodulation and channel estimation of orthogonal signaling formats in asynchronous DS-CDMA systems Academic Article uri icon


  • Iterative schemes for demodulating M-ary orthogonal signaling formats in direct-sequence code-division multiple access (DS-CDMA) systems are proposed and compared with the standard noncoherent matched filter receiver. Interference cancellation, i.e., (approximative) removal of the multiple access interference (MAI) by means of subtraction is studied. The considered system is similar to the uplink (reverse link) of an IS-95 system. Hence, the received signals from the concurrent users are asynchronous, and no pilot signals are available for channel estimation. A decision-directed algorithm is proposed for estimating the time-varying complex channel gains of a multipath channel. The receivers are evaluated on Rayleigh-fading channels and are shown to provide large capacity gains compared with the conventional receiver.

published proceedings

  • IEICE Transactions on Electronics

author list (cited authors)

  • Strom, E. G., & Miller, S. L.

complete list of authors

  • Strom, EG||Miller, SL

publication date

  • January 2002