Xianyi Rui

Performance Analysis of MIMO MRC Systems in the Presence of Self-Interference and Co-Channel Interferences

Both self-interference (SI), which is caused by imperfect channel estimation, and co-channel interference (CCI) are considered in multiple-input multiple-output systems employing maximal ratio combining under independent and identically distributed Rayleigh fading. Closed-form expressions for probability density function and outage probability of output signal-to-interference plus noise ratio are presented. Numerical results are used to evaluate the impact of SI and CCI.

Symbol error rate analysis of multiple-input multiple-output maximal ratio combining systems with self-interference and co-channel interference

The self-interference (SI), which is caused by imperfect channel estimation, and co-channel interference (CCI) are considered in multiple-input multiple-output systems employing maximal ratio combining under independent and identically distributed Rayleigh fading. The analysis is independent of any specified estimation scheme and the channel estimation errors are assumed to be Gaussian distributed. Closed-form expressions for cumulative distribution function of the output signal-to-interference plus noise ratio are derived for both equal-power and unequal-power CCI cases. On the basis of these expressions, the exact closed-form expressions for the symbol error rate are presented to investigate the impact of SI and CCI. The analytical results are compared with the simulation results and a good agreement is obtained.

A perturbation particle swarm optimization for the synthesis of the radiation pattern of antenna array

In this paper, a modified particle swarm optimization algorithm is proposed, in which special techniques such as global best perturbation and inertia weight jump threshold are adopted. The convergence speed and accuracy are improved. Using it, the problems such as prematurity and easily trapping in local optima can be avoided. The experiments of some benchmark functions demonstrate that it achieves relatively high performance. Optimization of the radiation pattern of antenna array using the PPSO is also presented.

Time-Frequency Distribution Based on Bi-directional Gaussian kernel and its application in instantaneous frequency estimation

In this paper, a kernel based on bi-directional Gaussian function is proposed to compute time-frequency distribution (TFD) of non-stationary signals. By controlling two parameters of the kernel in time lag and frequency lag directions, the new distribution makes a good improvement in time-frequency resolution and avoids the influence of cross terms. The application in instantaneous frequency (IF) estimation also demonstrates the distribution effective. Simulation results show that the TFD has good performance

Capacity analysis of MIMO MRC systems in correlated rayleigh fading environments

In this paper, we analyze the capacity of multiple-input multiple-output systems employing maximal ratio combining under Rayleigh fading environments in the presence of spatial fading correlation at the transmitter or receiver. Based on statistical properties of the largest eigenvalue of correlated complex Wishart matrices, the exact closed-form expressions for the cumulative distribution function and the probability density function of the output signal-to-noise ratio are presented. The results are used to analyze the outage and ergodic capacities of the systems. The analysis shows that ergodic capacity improves with the increase of the channel correlation coefficient and the analytical results are validated by Monte Carlo simulations.

The largest eigenvalue characteristic of correlated complex wishart matrices and its application to MIMO MRC systems

In this paper, we analyze statistical properties of the largest eigenvalue of correlated complex Wishart matrices. The results provide an analytical tool for the study of multiple-input multiple-output (MIMO) maximal ratio combining (MRC) systems in the presence of spatial fading correlation at the transmitter or receiver. Based on them, the exact closed-form expressions for the cumulative distribution function and the probability density function of the output signal-to-noise ratio are presented. The analytical results are validated by Monte Carlo simulations.