IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Regular Section
Exact & Closed-Form BER Expressions Based on Error-Events at Relay Nodes for DF Relay Systems over Rayleigh Fading Channels
Jeanyeung JANGKyunbyoung KO
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2011 Volume E94.B Issue 8 Pages 2419-2422

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Abstract

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.

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© 2011 The Institute of Electronics, Information and Communication Engineers
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