Multihop cellular systems are considered as a promising architecture for enhancing coverage and throughput of cellular systems. Furthermore, to exploit relay stations (RS's) instead of placing more base stations (BS's), it can be available to reduce total deployment cost of infrastructures in cellular systems. When the decode-and-forward (DF) relay strategy is used at each RS, the signal received by the RS is decoded and forwarded to the destination. For amplify-and-forward (AF) relay strategy, when the RS receives the signal, it simply amplifies and forwards the signal to the destination without any error correction or detection processing. Since each wireless link usually introduces errors occurred by the influence of interference and noise, the capacity might be degraded. Therefore, AF relay strategy does not necessarily work well in wireless network condition. Up to now, the performances of AF and DF relay strategies have been mostly investigated by simple model, i.e., one source, one relay, one destination, but have not been evaluated in cellular systems, i.e., multihop cellular systems.
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