Relay signaling and routing schemes in MIMO-relay networke

MIMO-relay technology is accepted as a promising solution to improve cell edge performance for the future 4G wireless system. In this paper, a relay filtering and signaling method along with different routing schemes are proposed to improve the average capacity of the network from multiple sources to multiple destinations aided by multiple relays, where each node is equipped with multiple antennas. In the paper, a relay filtering method is first studied to decompose the complex channel of `multiple sources´-`multiple relays´-`multiple destinations´ into several independent channels of `single source´-`single relay´-`single destination´; then the relay signaling method is discussed to optimize the capacity of each decomposed channel, and the relay power allocation scheme among different decomposed channels is further analyzed; at last different routing schemes are compared in the relay network, and an optimal routing scheme with large signaling overhead and several suboptimal routing schemes with less signaling overhead are proposed. Numerical results show that the proposed relay signaling and routing schemes can effectively take advantage of the MIMO-relay network and improve network capacity.