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

Kyeong Jin Kim, Hongwu Liu, Zhiguo Ding, Philip V. Orlik, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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. Non-identical 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, is extended to this new channel environment. For an overpopulated system setup, a generalized performance analysis, is not available from existing works, is 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.

Original languageBritish English
Article number9145732
Pages (from-to)7218-7231
Number of pages14
JournalIEEE Transactions on Communications
Issue number11
StatePublished - Nov 2020


  • coexisting line-of-sight and non-line-of-sight paths
  • cyclic delay diversity
  • Distributed single carrier system
  • diversity gain
  • non-identical frequency selective fading


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