2014/11/06 by Bruno Clerckx, Clerckx, Bruno, David Gesbert +1
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Techniques #Advanced Wireless Network Optimization #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT)
paper · pdf · doi:10.48550/arxiv.1411.1801
openalex publication_date 2014/11/06 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
Studies of the MISO Broadcast Channel (BC) with delayed Channel State\nInformation at the Transmitter (CSIT) have so far focused on the sum-rate and\nDegrees-of-Freedom (DoF) region analysis. In this paper, we investigate for the\nfirst time the error rate performance at finite SNR and the\ndiversity-multiplexing tradeoff (DMT) at infinite SNR of a space-time encoded\ntransmission over a two-user MISO BC with delayed CSIT. We consider the\nso-called MAT protocol obtained by Maddah-Ali and Tse, which was shown to\nprovide 33% DoF enhancement over TDMA. While the asymptotic DMT analysis shows\nthat MAT is always preferable to TDMA, the Pairwise Error Probability analysis\nat finite SNR shows that MAT is in fact not always a better alternative to\nTDMA. Benefits can be obtained over TDMA only at very high rate or once\nconcatenated with a full-rate full-diversity space-time code. The analysis is\nalso extended to spatially correlated channels and the influence of transmit\ncorrelation matrices and user pairing strategies on the performance are\ndiscussed. Relying on statistical CSIT, signal constellations are further\noptimized to improve the error rate performance of MAT and make it insensitive\nto user orthogonality. Finally, other transmission strategies relying on\ndelayed CSIT are discussed.\n