Performance Analysis of Wireless Dual-Hop Systems With Multirelay and Multiuser

Abstract

This paper presents closed-form expressions for the end-to-end performance of wireless dual-hop systems with multiple amplify-and-forward relays and multiple users over Rayleigh flat fading channels. These results are based on the statistics of the harmonic mean of two random variables related to exponential distribution. Two generalized scheduling policies are considered in the systems for selection diversity from multirelay and multiuser: the centralized scheduling (CS) and the distributed scheduling (DS). Numerical results show that the performance of DS can be degraded when large number of relays are used relative to the number of users. Additionally, it is shown that DS is quite competitive with CS at small number of relays that can be considered to be desirable.

Performance Analysis of Maximum SNR Scheduling with an Infrastructure Relay Link

“…The ergodic capacity is illustrated in Fig. 5 using (24), (30) and (36). Naturally, the ergodic capacity is also limited by the AWGN channel capacity of the BS-RN or the RN-BS backhaul link.…”

“…Thus, the downlink and uplink performances in the DAS are related by swapping the variables similarly to (26)- (30). By taking the limitsγ SR → ∞ andγ RD → ∞ of (18), (26) and (32), the downlink and uplink outage probabilities in the DAS become…”

“…[20][21][22][23][24][25][26]. Multi-user scheduling [27][28][29][30] and antenna selection diversity [31] with mobile relays have also been studied. Nevertheless, the contributions of this paper are novel, because the relay nodes are fixed and part of the cellular infrastructure, which leads to a previously unheeded system model.…”

One-Bit CSI Feedback Selection Schemes for Energy-Efficient Multiuser and Multirelay Systems

“…Relay and user scheduling have also gained popularity in the context of point-to-multipoint networks [21], [22], [32], [33], where relays are used to increase network coverage and throughput at low cost [34]- [37]. In cellular system enhancement, relays are considered as part of the network infrastructure and transmit to assigned users to provide coverage extension.…”

“…In [22], the authors present the downlink performance of distributed scheduling (DS) and centralized scheduling (CS) schemes for multiuser and multirelay systems based on maximum SNR. While distributed scheduling is strictly capacitysuboptimal compared to centralized scheduling, it has reduced feedback.…”