EXIT chart aided design of DS-CDMA UltraWideBand systems using iterative decoding

R. A. Riaz, M. El-Hajjar, Q. Z. Ahmed, S. X. Ng, S. Chen, L. Hanzo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper presents a novel UltraWideBand (UWB), Direct Sequence Code Division Multiple Access (DS-CDMA) aided system designed for the IEEE 802.15.3a UWB channel specifications. Substantial performance improvements can be attained by serially concatenated channel encoding combined with a Unity Rate Code (URC). We compare the performance of the iterative aided decoding Correlation (Corr) and Minimum Mean Square Error (MMSE) detectors exchanging extrinsic information between the URC's decoder as well as the outer Recursive Systematic Convolutional (RSC) code's decoder. Moreover, the iterative decoding convergence analysis of the proposed system is carried out with the aid of Extrinsic Information Transfer (EXIT) charts. As expected, the iteratively decoded fully-loaded system employing MMSE detection outperforms its counterpart employing the equivalent Corr detection. Explicitly, UWB DS-CDMA using the MMSE detector attains a BER of 10-5 at Eb/No = 2dB when supporting U = 32 users employing i = 12 decoding iterations, while the same system using the Corr detector operates at BER-10-1.

Original languageEnglish
Title of host publicationThe 68th IEEE Vehicular Technology Conference, VTC 2008-Fall
Number of pages5
Publication statusPublished - 1 Dec 2008
Externally publishedYes
Event68th Semi-Annual IEEE Vehicular Technology Conference - Calgary, Canada
Duration: 21 Sep 200824 Sep 2008
Conference number: 68


Conference68th Semi-Annual IEEE Vehicular Technology Conference
Abbreviated titleVTC 2008-Fall


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