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M-sequence based M-ary/SS scheme for high bit rate transmission in DS/CDMA systems

M-sequence based M-ary/SS scheme for high bit rate transmission in DS/CDMA systems

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A high bit rate and high power efficiency transmission scheme is proposed which uses an M-sequence based M-ary/SS scheme for DS/CDMA systems combined with a block branch metric calculation for the Viterbi decoder and a signal to noise plus interference power ratio (SNIR) measurement scheme for transmitter power control (TPC). Computer simulation confirms that the proposed scheme leads to a much higher BER performance while maintaining a lower peak to average transmitter power ratio.

Inspec keywords: multimedia communication; spread spectrum communication; Viterbi decoding; code division multiple access; sequences

Other keywords: transmitter power control; DS/CDMA systems; Viterbi decoder; peak to average transmitter power ratio; M-sequence based M-ary/SS scheme; block branch metric calculation; power efficiency; high bit rate transmission; signal to noise plus interference power ratio

Subjects: Multiple access communication; Protocols; Multimedia communications

References

    1. 1)
      • Okawa, K., Okumura, Y., Sawahashi, M., Adachi, F.: `1.92 Mbps data transmission experiments over a coherent W-CDMA mobileradio link', Proc. IEEE Int. Conf. Vehicular Technology, May 1998, 2, Ottawa, Canada, p. 1300–1304.
    2. 2)
      • Holma, H., Heiska, K.: `Performance of high bit rates with WCDMA over multipath channels', Proc. IEEE Int. Conf. Vehicular Technology, May 1999, 1, Houston, USA, p. 25–29.
    3. 3)
      • S. Abeta , S. Sampei , N. Morinaga . A coherent detection system with a suppressed pilot channel for DS/CDMAsystems. IEICE Trans. Commun. , 11 , 641 - 648
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