Exact BER performance of asynchronous MC-DS-CDMA over fading channels

Authors:
Besma Smida;Lajos Hanzo;Sofiène Affes
Affiliations:
Department of Electrical and Computer Engineering, Purdue University, Hammond, IN;School of Electronics and Computer Science, University of Southampton, Southampton, UK;INRS Energie, Materiaux et Telecommunications, Montreal, Quebec, Canada
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

Citing 6
Cited 0

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Abstract

In this contribution an accurate average Bit Error Rate (BER) formula is derived for MC-DS-CDMA in the context of asynchronous transmissions and random spreading sequences. We consider a flat Nakagami-m fading channel for each subcarrier. Our analysis is based on the Characteristic Function (CF) and does not rely on any assumption concerning the statistical behavior of the interference. We develop a new closed-form expression for the conditional CF of the inter-carrier interference and provide a procedure for calculating the exact BER expressed in the form of a single numerical integration. The accuracy of the Standard Gaussian Approximation (SGA) technique is also evaluated. Link-level results confirm the accuracy of the SGA for most practical conditions.