Approaching multiple-access channel capacity via turbo multiuser detection

Summary form only given. Turbo multiuser detection refers to joint multiuser detection and channel decoding via an iterative exchange of soft information between the two processes. This technique, which offers an attractive combination of low complexity and near-optimal performance, has been applied to a number of systems with very promising results. In this talk, we give an overview of the recent development of analytical tools for assessing and optimizing the performance of various turbo multiuser detection techniques, and its application in emerging wireless systems. Specifically, we discuss performance analysis of several turbo receivers using density evolution and EXIT chart techniques. We also discussed the use of large-system asymptotic analysis tools to treat the problem of coding-spreading tradeoff in CDMA systems with turbo multiuser detection. Moreover, we treat the design of capacity-achieving LDPC codes for various turbo multiuser detection schemes. Finally, we describe a new turbo multiple-access scheme that features extremely low receiver complexity and capacity-approaching performance.