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Neural network space diversity combination and ring coding for multicarrier CDMA over fast fading channels

Lookup NU author(s): Emeritus Professor Rolando Carrasco

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Abstract

Multicarrier CDMA is a major candidate to fulfil the requirements of 3G mobile systems. A novel scheme is developed combining modulo-S ring TCM with RNN-based adaptive space diversity for multicarrier CDMA systems with single-antenna transmitter and multiple-antenna receiver. The nonlinear RTRL algorithm for antenna diversity combining combats the distortive effects of the communication channel and reduces the interference. Ring TCM channel coding and RNN space diversity are evaluated in 16-QAM multicarrier CDMA systems transmitting over Rician and Rayleigh fast fading channels with a maximum Doppler frequency of 96 Hz. Modulo-4 ring TCM codes of 16 and 64 states have been designed. The RNN system is shown to be superior to the linear algorithms in channels dominated by multipath fading, inter-symbol interference and multiple access interference. The complexity of the RNN structure is comparable to that of the linear techniques. The joint utilisation of RNN based diversity, ring TCM and binary TCM coding schemes has been implemented. Whereas coding and space diversity do not provide sufficient benefit separately, the combination of both produces an increase in performance. (18 References).

Publication metadata

Author(s): Carrasco RA; Uribeetxeberria R

Publication type: Article

Publication status: Published

Journal: IEE Proceedings - Communications

Year: 2003

Volume: 150

Issue: 2

Pages: 121-128

ISSN (print): 1350-2425

ISSN (electronic): 1359-7019

Publisher: IEEE

URL: http://dx.doi.org/10.1049/ip-com:20030174

DOI: 10.1049/ip-com:20030174

Notes: Publisher: IEE, UK.

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