Research Article
Optimal sparse CDMA detection at high load
@INPROCEEDINGS{10.1109/WIOPT.2009.5291597, author={Jack Raymond}, title={Optimal sparse CDMA detection at high load}, proceedings={2nd International Workshop on Physics-Inspired Paradigms in Wireless Communications and Networks}, publisher={IEEE}, proceedings_a={PHYSCOMNET}, year={2009}, month={10}, keywords={Wireless Communication Unit Clause Propagation Optimal Detection}, doi={10.1109/WIOPT.2009.5291597} }- Jack Raymond
Year: 2009
Optimal sparse CDMA detection at high load
PHYSCOMNET
IEEE
DOI: 10.1109/WIOPT.2009.5291597
Abstract
Balancing efficiency of bandwidth use and complexity of detection involves choosing a suitable load for a multi-access channel. In the case of synchronous CDMA, with random codes, it is possible to demonstrate the existence of a threshold in the load beyond which there is an apparent jump in computational complexity. At small load unit clause propagation can determine a jointly optimal detection of sources on a noiseless channel, but fails at high load. Analysis provides insight into the difference between the standard dense random codes and sparse codes, and the limitations of optimal detection in the sparse case.
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