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In this paper, a scheme of multiple cells downlink joint transmitting for OFDMA system is introduced. The system and cell edge spectrum efficiency gain from the joint transmission is analyzed. The main factor to get the gain is the geography area selection of joint transmitting. Moreover, multiple users' joint transmitting provides the more significant gain than single users' joint transmitting.
Fixed relay as a candidate solution in the cellular system attracts more and more attention due to its improvements of coverage and capacity. In this paper, we make our study on the optimal configurations of two-hop relay downlink system. Based on former works, two typical resource allocation schemes of the two hops are considered on the assumption of TDD system-one is in time domain and the other...
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