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This paper considers the performance analysis of constructive interference(CI) precoding technique in multi-user multiple-input multiple-output (MU-MIMO)systems with a finite constellation phase-shift keying (PSK) input alphabet.Firstly, analytical expressions for the moment generating function (MGF) andthe average of the received signal-to-noise-ratio (SNR) are derived. Then,based on the derived MGF expression the average symbol error probability (SEP)for the CI precoder with PSK signaling is calculated. In this regard, new exactand very accurate asymptotic approximation for the average SEP are provided.Building on the new performance analysis, different power allocation schemesare considered to enhance the achieved SEP. In the first scheme, powerallocation based on minimizing the sum symbol error probabilities (Min-Sum) isstudied, while in the second scheme the power allocation based on minimizingthe maximum SEP (Min-Max) is investigated. Furthermore, new analyticalexpressions of the throughput and power efficiency of the CI precoding inMU-MIMO systems are also derived. The numerical results in this workdemonstrate that, the CI precoding outperforms the conventional interferencesuppression precoding techniques with an up to 20dB gain in the transmit SNR interms of SEP, and up to 15dB gain in the transmit SNR in terms of thethroughput. In addition, the SEP-based power allocation schemes provideadditional up to 13dB gains in the transmit SNR compared to the conventionalequal power allocation scheme.

Error Probability Analysis and Power Allocation for Interference Exploitation Over Rayleigh Fading Channels