Exact & Closed-Form BER Expressions Based on Error-Events at Relay Nodes for DF Relay Systems over Rayleigh Fading Channels

Jeanyeung JANG  Kyunbyoung KO  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.8   pp.2419-2422
Publication Date: 2011/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2419
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
DF relay systems,  Rayleigh fading channels,  FDF,  ADF,  

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In this letter, we derive another exact bit error rate (BER) for decode-and-forward (DF) relay systems over Rayleigh fading channels. At first, our focus is on fixed-DF (FDF) relay schemes in which the probability density function (PDF) is derived based on error-events at relay nodes. Some insight into how erroneous detection and transmission at relay nodes affect both the combined signal-to-noise ratio (SNR) and the averaged BER is obtained, and cooperative diversity is observed from the closed-form BER expression. In addition, the developed analytical method is extended to adaptive-DF (ADF) schemes and the exact BER expressions are derived. Simulation results are finally presented to validate the analysis.