| Compared with the conventional single input single output(SISO)technology,multiple input multiple output(MIMO)technology has higher spectral efficiency and channel capacity,so it has become one of the research topics to promote the revolutionary development of mobile communication.This paper is mainly based on angular energy spatial channel modeling and MIMO system performance analysis.Through the channel modeling of specific environment,the influence of the power spectrum distribution of the signal,the antenna array antenna and the spatial fading correlation on the system performance is analyzed.The analysis makes a theoretical basis.Then,this paper studies several typical wireless communication scenarios,establishes different channel reference models and simulation models suitable for different propagation environments,and proposes corresponding parameter calculation methods.The specific work of this paper is mainly in the following five aspects:Firstly,using a uniformly distributed linear antenna array and a circular antenna array as a model,the MIMO fading correlation theory under the condition that the power spectrum of the signal is uniformly distributed,Gaussian,Laplacian and its combined distribution is analyzed,and the reception is derived.The signal space fading correlation is generalized,and the correlation of received signals under various power spectrum distributions is analyzed in detail.When the power spectrum distribution is multilaterally distributed,the fading correlation characteristics of its received signal are derived.Secondly,the performance of MIMO antenna array system is analyzed by analyzing spatial time correlation and antenna array configuration.Uniform Linear Array(ULA)and uniform circular array(UCA)are derived when angular energy follows Laplacian distribution.The fading correlation analytical formula.The conclusion shows that when the array element spacing increases or the angle expansion increases,the spatial fading correlation decreases and the system performance is improved.Then,for the narrow-band wireless propagation channel line-of-sight(LOS)and non-line of sight(NLOS)environments of specific propagation scenarios,a reference model is introduced to study its modeling design and its related characteristics.A comprehensive improved indoor reference channel model based on geometric scattering model.An efficient SOC channel simulation model is proposed by the unrealistic reference model.Two effective parameters calculation methods of the SOC channel simulation model are proposed and the computational performance of the two are compared.The results show that the statistical characteristics of the SOC channel simulation model are matched with the reference model,which can be well applied to evaluate the performance of indoor wireless communication systems.Then,the related characteristics of the mobile fading channel in the previously studied transmission environment are applied to the modeling of the underwater environment.A reference channel model based on the geometric scattering model of the underwater environment is proposed.The probability distribution of the arrival angle of the electromagnetic signal is also derived.Analytic expression of function,power delay distribution,frequency correlation function.The results show that the SOC channel simulation model is related to the frequency correlation function and the reference model is consistent.Finally,under the condition that the ocean surface and bottom are horizontal but the surface is not smooth,the underwater acoustic channel and its geometric-based broadband channel model are studied.Firstly,a suitable geometric model is proposed for the research environment.Based on this,a reference model and a new parameter calculation method are established.The performance of the model is compared with the traditional method in terms of time-frequency correlation function.The results show that the method greatly reduces the complexity of the model establishment and ensures the accuracy of the experimental results. |
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