WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 13, 2014
Capacity Analysis of MIMO-OFDM Decode-and-Forward (DF) Relay Networkin the Presence of High Power Amplifiers Nonlinearity
Authors: ,
Abstract: This paper presents the ergodic capacity of nonlinear MIMO-OFDM Decode-and-Forward (DF) relay network.Nonlinearities in wireless communication channels can arise at the transmitter or the receiver side. In this work, we focus on the transmitter-side nonlinearities induced by the High Power Amplifier (HPA), the last stage in the communication chain at the base station (BS) and the relay stations (RS’s). We consider MIMO-OFDM relaying system where the BS, RS’s, and the mobile stations (MS’s) are all equipped with transmitting and receiving antennas, and HPAs at the BS and RS’s exhibit general nonlinear behaviors. We derive closed-form expression for the ergodic capacity of the DF relaying protocol. Our results show that high-order MIMO systems suffer more capacity loss due to HPA nonlinearity than low-order MIMO systems, and that more capacity loss is experienced in multihop relaying over nonlinear channels as more relay hops are involved.
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Pages: 417-423
WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 13, 2014, Art. #46