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The role of channel distribution information in the cross-layer design of opportunistic scheduler for MIMO networks

In this paper, we design a new class of cross-layer opportunistic channel access scheduling framework for multiple-input multiple-output (MIMO) networks through exploitation of channel distribution information (CDI) in a form of full spatial correlation matrix. Due to propagation delay, infrequent channel updates, and time-varying node position, channel knowledge becomes outdated and scheduler based solely on channel state information (CSI) can experience severe performance degradation. By utilizing the higher stability of channel statistics such as CDI, we can achieve ‘differential’ time-scale equalization in MIMO networks between Physical (PHY) and Media Access Control (MAC) layer and reduce the frequency and amount of feedback between nodes.