Abstract
A multi-relay cooperative quadrature spatial modulation (QSM) system is proposed in this paper. The distinguishable feature of the multi-relay cooperative QSM lies in the enlarged aggregate throughput of the system since extra information bits at the source can be transmitted through the selection of the relays. During the communication process, only one relay is activated which adopts the amplify-and-forward (AF) relaying protocol. Furthermore, a closed-form expression of the average pairwise error probability (APEP) of the proposed multi-relay cooperative QSM system is given and employed to derive the tight upper bound of the average bit error probability (ABEP) over Rayleigh fading channels. Monte-Carlo simulation shows that the proposed multi-relay cooperative QSM system achieves better ABEP performance compared with the traditional multi-relay cooperative spatial modulation (SM) system.
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