Abstract
In this paper, the practical performance of space-frequency block code (SFBC)-based multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system in the presence of nonlinear power amplifier with imperfect channel state information (CSI) over two-wave with diffuse power (TWDP) channel is analyzed. In the performance analysis, we first introduce the equivalent single-input single-output (SISO) scalar model with nonlinear power amplifier and then the SISO model is used to construct a model for the nonlinear MIMO-OFDM system. Considering the channel estimation error at the receiver, we study the effects of MMSE channel estimation error on the channel capacity. What is more, based on inter modulation product (IMP) analysis, we study the BER performance of nonlinear SFBC MIMO-OFDM systems, considering M-ary phase shift keying (MPSK) and M-ary quadrature amplitude modulation (MQAM). And the effects of channel estimation error on the BER performance are studied. Finally, this paper also derives the closed-form expressions of the system optimal operating point. The numerical results and comparisons are provided for several forms of SFBC MIMO-OFDM. From these analysis results, it is found that the analytical interpretation of the observed behavior in the simulation can be advanced, and the actual analysis of the performance optimization of the nonlinear MIMO-OFDM system is also provided.
Highlights
Orthogonal Frequency Division Multiplexing (OFDM) is widely used as an attractive technology in modern wireless communications due to its robustness to frequency selective fading channels and its potential to achieve high data rates [1]
The main purpose of this paper is to explore the practical performance analysis of space-frequency block coding (SFBC) multiple-input multiple-output (MIMO)-OFDM system in the nonlinear noise generated by the power amplifier under imperfect channel state information (CSI)
In order to simulate the channel environment of the real scene, we study the nonlinear SFBC-OFDM system over two-wave with diffuse power (TWDP) fading channel
Summary
Orthogonal Frequency Division Multiplexing (OFDM) is widely used as an attractive technology in modern wireless communications due to its robustness to frequency selective fading channels and its potential to achieve high data rates [1]. Y. Du et al.: Performance Analysis of Nonlinear SFBC OFDM Systems Over TWDP Fading Channel. Is the equivalent SISO scalar model effective for SFBC MIMO-OFDM systems when considering clear nonlinear distortion that power amplifier (PA) produces and the imperfections on the CSI? The main purpose of this paper is to explore the practical performance analysis of SFBC MIMO-OFDM system in the nonlinear noise generated by the power amplifier under imperfect CSI. For the BER analysis, we derive closed-form expressions for nonlinear SFBC MIMO-OFDM systems over TWDP fading channels, and both MPSK and MQAM are considered. Considering that H + e is a normalized XR × XT matrix and E+ represents an FFT operation, the above equation can be modified to,
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