Abstract
Due to the time-variant channel, outdated channel state information (CSI) largely reduce the performance of double codebook beamforming system. This paper studies the two codebooks independently and proposes an adaptive feedback period adjustment Strategy for long-term codebook and a prediction estimation algorithm for short-term codebook respectively. The former dynamically adjusts feedback period so as to improve the feedback timeliness and uplink feedback resource utilization. The later adopts improved Kalman prediction algorithm to predict CSI. Finally simulation results shows that the proposed schemes can effectively improve the performance of double codebook estimation with outdated CSI.
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Acknowledgments
This work is supported by Fundamental Research Funds of the Basic and Frontier Projects in Chongqing (cstc2016jcyjA0209) and the Central Universities (Grant No. 106112014CDJZR165505 and 106112013CDJZR160015).
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Wang, D., Liu, Y. & Liao, Y. Double Codebook Estimation and Feedback with Outdated CSI. Wireless Pers Commun 91, 1419–1433 (2016). https://doi.org/10.1007/s11277-016-3535-y
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DOI: https://doi.org/10.1007/s11277-016-3535-y