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Performance analysis of transmit beamforming for MISO systems with imperfect feedback

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3 Author(s)
Isukapalli, Y. ; Dept. of Electr. & Comput. Eng., Univ. of California, San Diego, CA ; Annavajjala, R. ; Rao, B.D.

In this paper, we analyze the performance of transmit beamforming on multiple-antenna Rayleigh fading channels with imperfect channel feedback. We characterize the feedback imperfections in terms of noisy channel estimation, feedback delay, and finite-rate channel quantization. We develop a general framework, that is valid for an arbitrary two-dimensional linear modulation, to capture the aforementioned imperfections and derive the symbol and bit error probability expressions for both M-PSK and M-ary rectangular QAM constellations with Gray code mapping. We show that the proposed analytical formulation is valid for a frequency-domain duplexing system with/without finite-rate channel quantization and a time-domain duplexing system. We validate the accuracy of the analysis through simulations, and assess the relative effects of channel estimation inaccuracy, feedback delay, and finite-rate quantization on the symbol and bit error performances for various constellations.

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Communications, IEEE Transactions on  (Volume:57 ,  Issue: 1 )