Minimising Complexity in Iterative Multiuser Detection using Dynamic Decoding Schedules

Paper in proceeding, 2006

In this paper we utilize extrinsic information transfer (EXIT) chart analysis with unequal user power levels in a coded directsequence 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 5000 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.