Imperfect and Unmatched CSIT is Still Useful for the Frequency Correlated MISO Broadcast Channel

Abstract

Since Maddah-Ali and Tse showed that the completely stale transmitter-side channel state information (CSIT) still benefits the Degrees of Freedom (DoF) of the Multiple-Input-Multiple-Output (MISO) Broadcast Channel (BC), there has been much interest in the academic literature to investigate the impact of imperfect CSIT on \emph{DoF} region of time correlated broadcast channel. Even though the research focus has been on time correlated channels so far, a similar but different problem concerns the frequency correlated channels. Indeed, the imperfect CSIT also impacts the DoF region of frequency correlated channels, as exemplified by current multi-carrier wireless systems. This contribution, for the first time in the literature, investigates a general frequency correlated setting where a two-antenna transmitter has imperfect knowledge of CSI of two single-antenna users on two adjacent subbands. A new scheme is derived as an integration of Zero-Forcing Beamforming (ZFBF) and the scheme proposed by Maddah-Ali and Tse. The achievable DoF region resulted by this scheme is expressed as a function of the qualities of CSIT.

arXiv commentAccepted to ICC'13 CT

References in corpus (2)

• Degrees-of-Freedom Region of the MISO Broadcast Channel with General Mixed-CSIT
• Degrees-of-Freedom Region of Time Correlated MISO Broadcast Channel with Perfect Delayed CSIT and Asymmetric Partial Current CSIT

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• MISO Broadcast Channel with Imperfect and (Un)matched CSIT in the Frequency Domain: DoF Region and Transmission Strategies
• Optimal DoF Region of the Two-User MISO-BC with General Alternating CSIT
• Toward the Performance vs. Feedback Tradeoff for the Two-User MISO Broadcast Channel
• MISO Networks with Imperfect CSIT: A Topological Rate-Splitting Approach
• DoF Analysis of the K-user MISO Broadcast Channel with Alternating CSIT
• Achievable DoF Regions of MIMO Networks with Imperfect CSIT
• Feedback-Aided Coded Caching for the MISO BC with Small Caches
• DoF Analysis of the K-user MISO Broadcast Channel with Hybrid CSIT
• On the Vector Broadcast Channel with Alternating CSIT: A Topological Perspective