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Transmitter Precoder Design to Improve the Performance of the MUSIC Algorithm

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3 Author(s)
L. Zhang ; L. Zhang is with the Department of Electrical and Computer Engineering, National University of Singapore. (email: ; Y. H. Chew ; W. -C. Wong

Using the MUSIC (MUltiple SIgnal Classification) algorithm to estimate the angle-of-arrival (AoA), we derive a new asymptotic error variance bound when the transmitted signal can be pre-processed. We next propose a precoder design to achieve this bound. However, such an optimal precoder requires channel state information at the transmitter (CSIT) exclusive of the receiver array which cannot be separately estimated practically. A more feasible precoder design, which leverages on the feedback CSIT estimated at the receiver, is next proposed. Using the performance of the optimal precoder which achieves the bound asymptotically as a benchmark, the practical precoder design performs closely to the optimal precoder even in high-resolution scenario. Both precoder schemes exhibit performance improvement compared with the case when no precoder is used.

Published in:

IEEE Transactions on Signal Processing  (Volume:PP ,  Issue: 99 )