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Optimal ARQ Protocol For Multihop MIMO Relay Networks Yao Xie, Deniz Gunduz, Andrea Goldsmith

ACHIEVEMENT DESCRIPTION. STATUS QUO. IMPACT. NEXT-PHASE GOALS. NEW INSIGHTS. Optimal ARQ Protocol For Multihop MIMO Relay Networks Yao Xie, Deniz Gunduz, Andrea Goldsmith. Found optimal ARQ protocol in multihop MIMO relay networks.

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Optimal ARQ Protocol For Multihop MIMO Relay Networks Yao Xie, Deniz Gunduz, Andrea Goldsmith

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  1. ACHIEVEMENT DESCRIPTION STATUS QUO IMPACT NEXT-PHASE GOALS NEW INSIGHTS Optimal ARQ Protocol For Multihop MIMO Relay NetworksYao Xie, Deniz Gunduz, Andrea Goldsmith Found optimal ARQ protocol in multihop MIMO relay networks. Characterized DMDT surfaces provide insights for practical optimal ARQ protocols design. • MAIN RESULTS • 3D DMDT Surfaces for Various ARQ protocols ((4,1,3) system) • ASSUMPTIONS AND LIMITATIONS: • Long-term/short-term static channel • Total number of ARQ rounds is L • Decode-and-forward relaying strategy • Channel state information at Rx, Rayleigh fading • Closed form solution for special cases and DMDT as a solution of a convex optimization problem in general diversity What is the rate-reliability-delay tradeoff in multihop MIMO relay networks? Fractional variable L = 1 Block variable • There are • Diversity-multiplexing tradeoff (DMT) analysis for relay channel • •Diversity-multiplexing-delay tradeoff (DMDT) for point-to-point MIMO with ARQ multiplexing Block Variable ARQ Fractional Variable ARQ L = 10 (2,2,2) system Long-term • We characterize the diversity-multiplexing-delay tradeoff (DMDT) surface for various ARQ protocols • •Theorem: the fractional variable ARQ protocol achieves optimal DMDT • “Relay should talk ASAP” ARQ 1 ARQ 2 diversity How it works: ARQ protocols in the MIMO relay networks H2 H1 Short-term Optimal Operational Point rate • Optimal ARQ protocol for general relay networks • Effects of power control • Joint source-channel coding in MIMO relay networks ARQ protocol provides one more dimension of tradeoff in MIMO relay networks.

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