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Volume 27 Issue 2
Feb.  2005
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Chen Zhong-lin, Zhu Guang-xi, Cai Wei . Spectrum-Efficient Differential Space-Time Coded CDMA Systems[J]. Journal of Electronics & Information Technology, 2005, 27(2): 221-225.
Citation: Chen Zhong-lin, Zhu Guang-xi, Cai Wei . Spectrum-Efficient Differential Space-Time Coded CDMA Systems[J]. Journal of Electronics & Information Technology, 2005, 27(2): 221-225.

Spectrum-Efficient Differential Space-Time Coded CDMA Systems

  • Received Date: 2003-08-04
  • Rev Recd Date: 2004-12-16
  • Publish Date: 2005-02-19
  • In this paper, a spectrum-efficient differential space-time transmission scheme is presented for Code-Division Multiple-Access (CDMA) systems. Consider a multiuser environment with M synchronous co-channel users, each is equipped with 2 transmit antennas. Assuming the receiver uses N2 receive antennas, this scheme will exploit decorrelating detectors and receive antenna diversity to separate M users. Then a noncoherent decoder is derived for flat Rayieigh fading channels, which can provide a minimum diversity order of 2x(jV-1) to each co-channel user. Compared with the existing differential space-time coded CDMA systems, the proposed scheme has two main advantages: Firstly, only by deploying an additional receive antenna, it can effectively improve the system performance under the condition that the spectrum efficiency is increased by 1/3; secondly, it has only linear decoding complexity.
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