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Analysis and compensation of power amplifier nonlinearity in MIMO transmit diversity systems

Qi, J. and Aissa, S. (2010) Analysis and compensation of power amplifier nonlinearity in MIMO transmit diversity systems. IEEE Transactions on Vehicular Technology, 59 (6). pp. 2921-2931. ISSN 0018-9545

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To link to this item DOI: 10.1109/TVT.2010.2049594


The nonlinearity of high-power amplifiers (HPAs) has a crucial effect on the performance of multiple-input-multiple-output (MIMO) systems. In this paper, we investigate the performance of MIMO orthogonal space-time block coding (OSTBC) systems in the presence of nonlinear HPAs. Specifically, we propose a constellation-based compensation method for HPA nonlinearity in the case with knowledge of the HPA parameters at the transmitter and receiver, where the constellation and decision regions of the distorted transmitted signal are derived in advance. Furthermore, in the scenario without knowledge of the HPA parameters, a sequential Monte Carlo (SMC)-based compensation method for the HPA nonlinearity is proposed, which first estimates the channel-gain matrix by means of the SMC method and then uses the SMC-based algorithm to detect the desired signal. The performance of the MIMO-OSTBC system under study is evaluated in terms of average symbol error probability (SEP), total degradation (TD) and system capacity, in uncorrelated Nakagami-m fading channels. Numerical and simulation results are provided and show the effects on performance of several system parameters, such as the parameters of the HPA model, output back-off (OBO) of nonlinear HPA, numbers of transmit and receive antennas, modulation order of quadrature amplitude modulation (QAM), and number of SMC samples. In particular, it is shown that the constellation-based compensation method can efficiently mitigate the effect of HPA nonlinearity with low complexity and that the SMC-based detection scheme is efficient to compensate for HPA nonlinearity in the case without knowledge of the HPA parameters.

Item Type:Article
Divisions:Faculty of Science
ID Code:33439
Uncontrolled Keywords:MIMO transmit diversity systems; MIMO-OSTBC system; QAM modulation order; SMC-based compensation method; channel-gain matrix estimation; constellation-based compensation method; high-power amplifier nonlinearity; multiple-input-multiple-output systems; nonlinear HPA; orthogonal space-time block coding systems; quadrature amplitude modulation; receive antennas; sequential Monte Carlo-based compensation method; signal detection; symbol error probability; transmit antennas; uncorrelated Nakagami-m fading channels; Channel estimation; compensation; high-power amplifier (HPA); multiple input–multiple output (MIMO); nonlinearity; orthogonal space–time block coding (OSTBC); sequential Monte Carlo (SMC);

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