Robust Multiuser Cdma Receivers Using Sequential Decoding

This paper considers the application of sequential decoding to the detection of data transmitted over the additive white Gaussian noise channel by K synchronous transmitters using direct sequence spread spectrum multiple access (DS-SSMA). A modification of Fano’s sequential decoding metric is derived using Gaussian approximation method. The performance of such a decoder that uses the improved metric for a multiuser system is compared using computer simulations. It is found that the decoder achieves results comparable to the optimal receiver with much reduced complexity.