On the optimal number of relay stations in two-hop relay cooperative cellular networks

Authors:
Jin Zi Long;Choongyong Shin;Dae-Young Kim;Jinsung Cho
Affiliations:
Kyung Hee University, Yongin, Korea;Kyung Hee University, Yongin, Korea;Kyung Hee University, Yongin, Korea;Kyung Hee University, Yongin, Korea
Venue:
Proceedings of the 5th International Conference on Ubiquitous Information Management and Communication
Year:
2011

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Abstract

Cooperative communications are adopted as a promising solution to achieve high data rate over large areas in the future 4G wireless system, and the relay station (RS) is the key concept in cooperative communications. However, most existing works in this area focus only on optimal RS selections. In addition, there are only few works consider another crucial issue: how many relay stations we need to place. Only when the number of relay stations is defined, the relay station selection can perform well. In this paper we exploit the Erceg B path loss model to create a formula which describes the impact of varying number of RS on end-to-end channel capacity. In addition to mathematical analysis on the feasibility of the formula, we also examine its performance through a set of simulations. Simulation results verify that the capacity gain of our proposed scheme is promising.