On the use of sigmoid functions for multistage detection in asynchronous CDMA systems

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We consider the use of sigmoid functions for multistage detection in asynchronous code-division multiple-access (CDMA) systems. The sigmoid decision function for each stage of multistage detection is derived under the assumption that the residual noise which remains after the multiple-access interference (MAI) cancellation at a stage is Gaussian, It is suggested that the sigmoid function should be adjusted depending on the residual noise power at each stage. In addition, multilevel quantizers that best approximate the sigmoid function are designed. Computer simulation results demonstrate that multistage detectors employing these soft-decision functions perform considerably better than those with hard decision.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
1999-03
Language
English
Article Type
Article
Keywords

COCHANNEL INTERFERENCE; CHANNELS

Citation

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.48, no.2, pp.522 - 526

ISSN
0018-9545
URI
http://hdl.handle.net/10203/12103
Appears in Collection
EE-Journal Papers(저널논문)
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