Abstract
This chapter discusses the optimum detection strategies for code division multiple access (CDMA) systems operating in “synchronous” and “asynchronous” channels. In synchronous CDMA transmission, each user transmits one symbol in a given time interval which interferes with other users' symbols in the same time interval. However, in asynchronous transmission systems, two symbols from each interfering user overlap the desire user symbol in any given time interval. From the analysis, it was found that the cost of the computation of the synchronous optimum detectors is exponential to the number of users and the computation cost of the asynchronous optimum detectors is exponentially dependent on the number of users, and on the data block length transmitted by each user. The chapter also discusses the techniques and algorithms that minimize the multiple access interference in group detection. Optimum receivers for CDMA systems are designed according to two different strategies: the “individually optimum strategy” used to minimize the probability of error for each individual user in the group. The other strategy, called the “jointly optimum detection,” maximizes the a posteriori probability. The individually optimum strategy is relatively more complex than a joint scheme. Multiuser detection comes under titles such as group or joint detection.
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