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Asymptotically Optimal Channel Feedback Protocol Design for Cognitive Multiple Access Channels

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Executive Summary

In cognitive multiple access networks, primary secondary feedback links are needed to convey Secondary Transmitter Primary Base station (STPB) channel gains from the Primary Base Station (PBS) to the Secondary Base Station (SBS). To reduce the amount of feedback exchange between PBS and SBS, this paper proposes a feedback control protocol called K smallest channel gains (K-SCG) feedback protocol in which the PBS feeds back the KN smallest STPB channel gains, out of N of them, to the SBS. They study the performance of K-SCG feedback protocol for Total Power and Interference Limited (TPIL) networks when transmit powers of Secondary Users (SUs) are optimally allocated.

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