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IDMA Vs. CDMA: Detectors, Performance and Complexity | IEEE Conference Publication | IEEE Xplore

IDMA Vs. CDMA: Detectors, Performance and Complexity

Publisher: IEEE

Abstract:

This paper presents comprehensive comparisons of interleave division multiple access (IDMA) and direct sequence code division multiple access (DS-CDMA) in terms of perfor...View more

Abstract:

This paper presents comprehensive comparisons of interleave division multiple access (IDMA) and direct sequence code division multiple access (DS-CDMA) in terms of performance and complexity using iterative multiuser detection technique, where we restrict ourself to three suboptimum linear detectors: minimum mean square error (MMSE), rake (or matched filter), and soft-rake detectors from practical concerns. We first analytically compare these detectors, which are found to be equivalent for IDMA with asynchronous users on flat channels, whereas this does not hold for DS-CDMA, which is sensitive to user asynchronism. This implies that, on flat channels, simple detector suffices to get the MMSE output for IDMA while DS-CDMA requires more complexity such as computing matrix inversions. We also discuss several aspects of complexities for IDMA and DSCDMA when the MMSE detector is used. Computer simulations are performed in various scenarios and the performance is analyzed by bit error rate as well as by extrinsic information transfer chart. The analysis reveals some advantages of IDMA over DS-CDMA, particularly in highly user loaded scenarios.
Date of Conference: 30 November 2009 - 04 December 2009
Date Added to IEEE Xplore: 04 March 2010
Print ISBN:978-1-4244-4148-8
Print ISSN: 1930-529X
Publisher: IEEE
Conference Location: Honolulu, HI, USA

References

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