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A Unified Analysis of Quaternary DS-CDMA Systems with Arbitrary Chip Waveforms and Its Applications

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Abstract

This paper is to present a systematic performance analysis of asynchronous quaternary direct sequence code division multiple access (DS-CDMA) systems using random signature sequences with arbitrary chip waveforms. The simplified improved Gaussian approximation method for bit error rate computation is extended to include arbitrary time-limited (full response or partial response) or band-limited chip waveforms with arbitrary receiver filters. As a time-limited partial response chip waveform modulation format, the well-known power and spectral efficient “superposed quadrature amplitude modulation” with matched filter or zero-forcing filter is evaluated, and the results show that the optimum zero-forcing filter will yield a performance better than the matched filter counterpart. For band-limited chip waveforms, based on an elementary density function of a second-order polynomial, a class of second-order continuity pulses is proposed for analysis. It is found that all common band-limited pulses are only its special cases. As a member of the class, the widely used frequency domain raised cosine pulse has the worst anti-multiuser-access-interference capability, which has been pointed out in (H. H. Nguyen, Proceedings of IEEE Canadian Conference on Electrical & Computer Engineering, 2002, pp. 1271–1275).

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Authors and Affiliations

  1. Department of Telecommunication Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Rongfang Song

  2. Department of Advanced Technology, Technology Center, ZTE Corporation, China

    Rongfang Song

  3. Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China

    S.H. Leung

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  1. Rongfang Song
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  2. S.H. Leung
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Correspondence to Rongfang Song.

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Song, R., Leung, S. A Unified Analysis of Quaternary DS-CDMA Systems with Arbitrary Chip Waveforms and Its Applications. Wireless Pers Commun 31, 111–129 (2004). https://doi.org/10.1007/s11277-004-7634-9

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  • DOI: https://doi.org/10.1007/s11277-004-7634-9

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