Alam, MM and Chockalingam, A (2003) Performance of Adaptive Multiuser Detectors in Space-Time Coded CDMA Systems. In: 14th IEEE 2003 Personal, Indoor and Mobile Radio Communications, 7-10 September, Beijing,China, Vol.2, 1824 -1828.
In this paper, we present a comparative performance evaluation of adaptive multiuser detectors, including stochastic gradient (SG) and recursive least squares (RLS) algorithms (which require training data), and minimum output energy (MOE) and subspace-based MMSE (S-MMSE) algorithms (which do not require training data), under near-far conditions in a space-time coded CDMA system. VVe show that, in a near-far multiuser scenario, increasing the number of transmit antennas degrade the near-far resistance performance of the SG and MOE detectors significantly at high near-far ratios, to the extent that the diversity benefit of multiple transmit antennas is ified. The RLS and S-MMSE algorithms, on the other hand, are shown to maintain their near-far resistance without loosing much on the diversity gain, when the number of transmit antennas is increased.
|Item Type:||Conference Paper|
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|Keywords:||Space-time codes;CDMA;Adaptive multiuser detection|
|Department/Centre:||Division of Electrical Sciences > Electrical Communication Engineering|
|Date Deposited:||23 Dec 2005|
|Last Modified:||19 Sep 2010 04:22|
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