Abstract
This paper is devoted to an investigation of an exact average symbol error probability (SEP) for amplify and forward (AF) relaying in independent Nakagami-m fading environments with a nonnegative integer plus one-half m, which covers many actual scenarios, such as one-side Gaussian distribution (m=0.5). Using moment generating function approach, the closed-form SEP is expressed in the form of Lauricella multivariate hypergeometric function. Four modulation modes are considered: rectangular quadrature amplitude modulation (QAM), M-ary phase shift keying (MPSK), M-ary differential phase shift keying (MDPSK), and π/4 differential quaternary phase shift keying (DQPSK). The result is very simple and general for a nonnegative integer plus one-half m, which covers the same range as integer m. The tightness of theoretical analysis is confirmed by computer simulation results.
Highlights
When the transceiver is far away, it is not a wise choice to increase transmit power in green communications
The simulation results of the error probability for quadrature amplitude modulation (QAM), M-ary phase shift keying (MPSK), M-ary differential phase shift keying (MDPSK), and differential quaternary phase shift keying (DQPSK) are evaluated
The average SNR per symbol is defined as Ps/N0 = Pr/N0, where Ps and Pr represent transmit power of the source and the relay, respectively
Summary
When the transceiver is far away, it is not a wise choice to increase transmit power in green communications. An asymptotic bit error probability formula was provided in [3,4,5] for all participate and selective AF cooperation. We calculate the exact average SEP formulas in an AF relay system over Nakagami-m fading environment when m is a nonnegative integer plus one-half, while it includes as a special case the one-sided Gaussian distribution (m = 0.5). Such closed-form expressions are urgent because they allow fast and efficient evaluation of system reliability.
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