On MSE Exit Chart Analysis and Real Time DSP Implementation for Iterative (Turbo) Detection

Authors:
Messaoud Ahmed-Ouameur;Daniel Massicotte
Affiliations:
Laboratory of Signal and System Integration (LSSI), Department of Electrical and Computer Engineering, Université du Québec à Trois-Rivières, Trois-Rivières, Canada G9A 5H ...;Laboratory of Signal and System Integration (LSSI), Department of Electrical and Computer Engineering, Université du Québec à Trois-Rivières, Trois-Rivières, Canada G9A 5H ...
Venue:
Journal of Signal Processing Systems
Year:
2011

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Abstract

We investigate the use of the mean square error (MSE) transfer characteristics to examine the convergence behaviour of the iterative (turbo) multiuser detector for coded code-division multiple-access (CDMA) systems. Both MSE and mutual information (MI) based extrinsic information transfer (MSE-EXIT and MI-EXIT) chart techniques reveal the same asymptotic and convergence behaviours. An improved low complexity version of the soft interference cancellation MMSE (SIC-MMSE) detection scheme is also proposed for CDMA systems utilizing BPSK modulation. Herein, under fixed-point data representation and computation constraint a real time DSP implementation (using TMS320C6416) is suggested. EXIT charts reveal that fixed-point implementation is feasible at possibly no performance degradation. Based on the measured number of cycles of different constituent sub-functions of the proposed receiver, a data transmission rate of up to 186 Kb/s can be reached for a 5-users load and a processing gain of 7 in an AWGN channel.