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access icon free Performance analysis of orthogonal frequency division multiplexing-based cooperative amplify-and-forward networks with non-linear power amplifier over independently but not necessarily identically distributed Nakagami-m fading channels

© The Institution of Engineering and Technology
Received 29/06/2016, Accepted 28/12/2016, Revised 19/12/2016, Published 06/01/2017

In this study, performance analysis of variable-gain amplify-and-forward relaying orthogonal frequency division multiplexing-based systems over independently but not necessarily identically distributed Nakagami-m fading channels using non-linear power amplifier (PA) at the relay and maximal ratio combining scheme at destination. Specifically, novel closed-form expressions of outage probability and asymptotic outage probability are investigated for the considered system model. Further, an average symbol error rate (ASER) expression is derived for general-order rectangular quadrature amplitude modulation (RQAM) scheme using cumulative distribution function-based approach, which is also the novel contribution of the work. Since the transfer function of PA used at relay is nonlinear, this introduces non-linear distortion (NLD) in the considered system model. Thus, the impact of NLD and fading parameters on outage probability, diversity gain of the system and ASER performances are analysed. Further, the impact of NLD on constellation order for RQAM scheme is also discussed. The theoretical results are compared with computer simulations to verify the accuracy of the derivations. The derived expressions are generalised over variety of fading environments for integer-valued fading parameter.

Inspec keywords: amplify and forward communication; higher order statistics; relay networks (telecommunication); nonlinear distortion; diversity reception; Nakagami channels; quadrature amplitude modulation; transfer functions; power amplifiers; statistical distributions; telecommunication network reliability; cooperative communication; OFDM modulation

Other keywords: cooperative amplify-and-forward networks; ASER performances; general-order RQAM; diversity gain; cumulative distribution function-based approach; variable-gain amplify-and-forward relaying; general-order rectangular quadrature amplitude modulation; fading parameters; nonlinear power amplifier; asymptotic outage probability; average symbol error rate expression; maximal ratio combining; independently distributed Nakagami-m fading channels; orthogonal frequency division multiplexing; performance analysis; nonlinear distortion; integer-valued fading parameter; transfer function; NLD; closed-form expressions; nonlinear PA

Subjects: Reliability; Modulation and coding methods; Other topics in statistics; Amplifiers; Radio links and equipment

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