Multiuser detector combining multicarrier transmission and decorrelating detector in a Rayleigh fading channel

Abstract

Summary form only given. A decorrelating detector is a suboptimal multiuser detector that has attracted much attention due to its inherent merits (Zvonar, Z. and Brady, D., 1995). The decorrelating detector provides substantial performance gains over the conventional detector under various conditions. The multicarrier DS/CDMA system is regarded as a viable alternative to the classical single carrier DS/CDMA system in that an available bandwidth is decomposed into a set of subbands. In each subband, the fading has non-selectivity. That is, path diversity is converted to frequency diversity. A new multiuser detector combining decorrelating detector and multicarrier schemes is proposed and analyzed in a frequency-selective Rayleigh fading channel. From numerical results, it is shown that the proposed detector achieves better BER performance and lower computational complexity than the conventional decorrelating detector. It is also shown that the proposed detector is robust to partial narrowband interference.