Alternate MIMO Relaying With Three AF Relays Using Interference Alignment

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Executive Summary

Recently, wireless relaying systems have been attractive option since they can improve the system throughput, enhance the cell-edge performance, and extend the cell coverage. However, relays typically operate in a half-duplex mode and this results in a loss of capacity pre-log factor. As such, there has been a steady interest in overcoming this disadvantage of half-duplex relaying systems. For instance, it is shown in that alternate relaying can significantly compensate for the loss of the pre-log factor. In this protocol, the source alternately transmits the signals to the destination via different relays, while it leads to inter-relay interference between relays in transmitter and receiver mode.

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