Abstract
In multi-hop relay systems, due to considerably small allocation times in a perfectly orthogonal time division multiple access (TDMA) protocol or greatly large length of sequence in a perfectly orthogonal code division multiple access (CDMA) protocol, a channel capacity of multi-hop relay systems is deteriorated. In order to improve the channel capacity, a spatial reuse TDMA/CDMA protocol is proposed, a performance of both protocols is analyzed and compared in perfect and imperfect channel state information. The optimal number of phases in the spatial reuse TDMA protocol and the optimal length of sequence in the spatial reuse CDMA protocol that can achieve the maximal channel capacity will be discussed in this paper. The numerical evaluation result indicates the channel capacity of spatial reuse TDMA/CDMA is higher than that of systems have perfect orthogonality or without TDMA/CDMA.
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