TR2021-024

Diversity Gain Analysis of Distributed CDD Systems in Non-identical Fading Channels


    •  Kim, K.J., Liu, H., Ding, Z., Orlik, P.V., Poor, H.V., "Diversity Gain Analysis of Distributed CDD Systems in Non-identical Fading Channels", IEEE Transactions on Communications, DOI: 10.1109/​TCOMM.2020.3010995, Vol. 68, No. 11, pp. 7218-7231, July 2020.
      BibTeX TR2021-024 PDF
      • @article{Kim2020jul,
      • author = {Kim, Kyeong Jin and Liu, Hongwu and Ding, Zhiguo and Orlik, Philip V. and Poor, H. Vincent},
      • title = {Diversity Gain Analysis of Distributed CDD Systems in Non-identical Fading Channels},
      • journal = {IEEE Transactions on Communications},
      • year = 2020,
      • volume = 68,
      • number = 11,
      • pages = {7218--7231},
      • month = jul,
      • doi = {10.1109/TCOMM.2020.3010995},
      • url = {https://www.merl.com/publications/TR2021-024}
      • }
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  • Research Areas:

    Communications, Signal Processing

Abstract:

This paper investigates the diversity gain of a distributed cyclic delay diversity (dCDD) scheme for cyclic-prefixed single carrier systems in non-identical fading channels. Nonidentical small-scale fading is assumed in the environment, in which non-identical line-of-sight and non-line-of-sight fading coexist. A condition for dCDD resulting in intersymbol interference free reception at the receiver, has been extended to this new channel environment. For an overpopulated system setup, a generalized performance analysis, which has not been available from existing works, has been conducted after developing closed-form expressions for the distribution of the signal-to-noise ratio (SNR) realized at the receiver. Since the order statistics are involved in the statistical properties of the SNR, the corresponding spacing statistics are utilized to derive feasible closed-form expressions. The finalized closed-form expressions are shown to provide very reliable outage probability and spectral efficiency of dCDD for underpopulated and overpopulated systems. An asymptotic performance analysis verifies the maximum achievable diversity of the dCDD even in the overpopulated case within the considered channel environment. Link-level simulations are conducted and these verify the maximum achievable diversity gain.