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Minimising Complexity in Iterative Multiuser Detection using Dynamic Decoding Schedules

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4 Author(s)
Shepherd, D. ; Wireless Signal Process., Australian Nat. Univ., Canberra, ACT ; Brannstrom, F. ; Zhenning Shi ; Reed, M.C.

In this paper we utilize extrinsic information transfer (EXIT) chart analysis with unequal user power levels in a coded direct-sequence code-division multiple-access (DS-CDMA) multiuser receiver to derive a dynamic decoding schedule. Conventional receivers generally follow a static predetermined decoding schedule. However, decoding delay and complexity can be significantly reduced while maintaining BER performance through a dynamic decoding schedule optimized for a given load and transmit power configuration. Verified through simulations, we show that complexity savings of up to 50% can be achieved. We also derive the effective EXIT charts which can be used for the convergence analysis and performance predictions of unequal power CDMA systems

Published in:

Signal Processing Advances in Wireless Communications, 2006. SPAWC '06. IEEE 7th Workshop on

Date of Conference:

2-5 July 2006