CAJ | 학술논문

本文推导波达信号功率谱对MIMO ( Multiple Input Multiple Output )多天线信号接收衰落相关性通用式，并分析了在各种功率谱分布下的接收信号相关性。结果证明分析可以很好地应用于波达信号功率谱为高斯分布、拉普拉斯分布和均匀角分布时的信道情况。在功率谱分布是双边分布时，导出了其接收信号衰落相关性特征。分析结果发现功率谱分布的标准偏差或角度扩展大小是确定接收信号衰落相关性的主导因素。数值结果表明在一定范围内增大天线阵列单元间的距离以及功率谱分布标准差可以减小天线阵列接收信号衰落相关性，改善系统性能。在阵列天线单元间在中长距离内，功率谱高斯分布更符合实际和有利于分析和提高无线信道多天线MIMO系统性能。
본문추도파체신호공솔보대MIMO ( Multiple Input Multiple Output )다천선신호접수쇠락상관성통용식，병분석료재각충공솔보분포하적접수신호상관성。결과증명분석가이흔호지응용우파체신호공솔보위고사분포、랍보랍사분포화균균각분포시적신도정황。재공솔보분포시쌍변분포시，도출료기접수신호쇠락상관성특정。분석결과발현공솔보분포적표준편차혹각도확전대소시학정접수신호쇠락상관성적주도인소。수치결과표명재일정범위내증대천선진렬단원간적거리이급공솔보분포표준차가이감소천선진렬접수신호쇠락상관성，개선계통성능。재진렬천선단원간재중장거리내，공솔보고사분포경부합실제화유리우분석화제고무선신도다천선MIMO계통성능。
This paper deduces arrival signal power spectrum for MIMO ( Multiple Input Multiple Output ) multi-antenna signal reception fading correlation common type and analyzes the received signal correlation distribution of various power spectrums. Results show that the analysis can be applied to the channel when arrival signal power spectrum is in Gauss distribution, Laplace distribution or uniform angle distribution. When the power spectrum distribution is bi-modal, the received signal fading correlation characteristics are also deduced. The analysis results show that the standard deviation of power spectrum distribution or size of spread angle is the dominant factor of signal fading correlation. Numerical results indicate that the increase of distance between antenna-array and standard deviation of power spectrum distribution can reduce fading correlation of antenna-array receiving signal within a certain range and improve the performance of the sys-tem. Between antenna-array elements within long distance,power spectrum of Gauss distribution is more practicable and beneficial to analyzing and improving the performance of wireless channel multi-antenna MIMO system.