This paper presents a low-complexity multiuserdecoding technique that can be implemented in real time for a convolutionally coded direct sequence code division multiple access (DS-CDMA) system. The main contribution,...
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This paper presents a low-complexity multiuserdecoding technique that can be implemented in real time for a convolutionally coded direct sequence code division multiple access (DS-CDMA) system. The main contribution, denoted here as the iterative prior update (IPU), consists of iterative interference cancellation and prior updates on sequences of coded bits combined with M-algorithm and list decoding. We illustrate performance gains over other low-complexity sequence detection and decoding, stratigies and argue that the algorithm converges within a few iterations and requires only a small size buffer for keeping track of the priors along iterations. The fact that the we can use existing available architectures for Viterbi decoding with slight modifications and can meet the real-time processing constraints makes the IPU algorithm an attractive alternative for cellular systems.
A multiuser communication system, which combines some advantages of Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA), is presented. For the uplink of a cellular mobile communication enviro...
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A multiuser communication system, which combines some advantages of Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA), is presented. For the uplink of a cellular mobile communication environment we analyse the properties of this scheme, taking into consideration multipath propagation on mobile radio channels. Applying error correction coding to this Direct Sequence CDMA system we are focusing on the problem of data detection and decoding. Since optimal detection and decoding are usually not feasible for reasons of complexity we also suggest a complexity reduced detection and decoding strategy. The performance of the considered system is evaluated by means of simulations using the channel models introduced by COST.
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