Performance of asynchronous DS-CDMA system with long and short spreading codes

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Performance of asynchronous DS-CDMA system with long and short spreading codes

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The effect of spreading code length on the BER performance of an asynchronous DS-CDMA system is studied by means of Monte Carlo simulation. The probability of the crosscorrelation value between segments of long sequences is also discussed. Results indicate that the system performance with very long codes is ~1 dB worse compared to that of short CDMA codes.

Inspec keywords: code division multiple access; probability; codes

Other keywords: system performance; long codes; Monte Carlo simulation; crosscorrelation value; BER performance; asynchronous DS-CDMA system; direct sequence; CDMA codes; short spreading codes; probability

Subjects: Probability and statistics; Protocols; Multiple access communication; Codes

References

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      • Gilhousen, K. S., Jacobs, I. M., Padovani, R., Weaver, L. A., Wheatley, C. E., Viterbi, A. J.: `System and method for generating signal waveforms in a CDMA cellulartelephone system', WO 92/00639, 1992.
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      • L. R. Welch . Lower bounds on the maximum cross correlation of signals. IEEE Trans. , 3 , 397 - 399
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      • Bekir, N. E.: `Bounds on the distribution of partial correlation for PN and Gold sequences', 1978, PhD, Univ. of Southern California, Los Angeles CA, p. 74.
    4. 4)
      • Baier, A.: `Multi-rate DS-CDMA: A promising access technique for third-generationmobile radio systems', Proc. PIMRC '93, 1993, Yokohama, p. 114–118.
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