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Performance of antenna diversity multiuser receivers in CDMA channels with imperfect fading estimation

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Abstract

The performance of antenna diversity coherent and differentially coherent linear multiuser receivers is analyzed in frequency-nonselective Rayleigh fading CDMA channels with memory. The estimates of the complex fading processes are utilized for maximal-ratio combining and carrier recovery of the coherent multiuser receiver. To analyze the impact of channel estimation errors on the receiver performance, error probability is assessed directly in terms of the fading rate and the number of active users, showing the penalty imposed by imperfect channel estimation as well as the fading-induced error probability floor. The impact of fading dynamics on the differentially coherent decorrelating receiver with equal-gain combining is quantified. While performance of multiuser receivers at lower SNR is determined by both the fading dynamics and the number of active CDMA users, performance at higher SNR is given by an error probability floor which is due to fading only and has the same value as in a single-user case. The comparison of the two receiver structures indicates that the coherent decorrelating receiver with diversity reception may be preferable to the differentially coherent one in nonselective fading CDMA channels with memory.

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Authors and Affiliations

  1. Communications Division, Analog Devices, 804 Woburn Street, 01887, Wilmington, MA, USA

    Zoran Zvonar

  2. Department of Electrical and Computer Engineering, Northeastern University, 02115, Boston, MA, USA

    Milica Stojanovic

Authors
  1. Zoran Zvonar
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  2. Milica Stojanovic
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Zvonar, Z., Stojanovic, M. Performance of antenna diversity multiuser receivers in CDMA channels with imperfect fading estimation. Wireless Personal Communications 3, 91–110 (1996). https://doi.org/10.1007/BF00333925

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