Theoretical analysis of frequency-correlation coefficient for received signal level in mobile communications
Theoretical analysis of frequency-correlation coefficient for received signal level in mobile communications
复制标题
移动通信接收信号电平频率相关系数的理论分析
DOI：
10.1109/tvt.2002.1015343
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Kozono
中科院分区：
文献类型：
--
作者：
H. Nakabayashi;S. Kozono
定义频率分集技术中的频率分离的频率相关系数特性使用允许接收带宽的传播模型进行理论研究。推导了非视距传播路径和视距传播路径下的频率相关系数公式。该方程表明，频率相关系数取决于这样的因素，如频率分离，接收带宽，路径长度的差异，和功率比的直接到间接波。频率相关系数随着接收带宽的增加而增加，随着路径长度差的增加而减小。然而，当路径长度的差异很小（30米），接收带宽的影响是最小的。频率相关系数也多少依赖于功率比。为了证实我们的理论推导的准确性，进行了计算机模拟。通过模拟瞬时接收信号电平计算频率相关系数。理论结果与模拟结果相吻合。
Frequency-correlation coefficient characteristics that define frequency separation in frequency-diversity techniques were studied theoretically using a propagation model that makes allowances for received bandwidth. Equations of frequency-correlation coefficients in non- and line-of-sight propagation paths were derived. The equations showed that frequency-correlation coefficient depends on such factors as frequency separation, received bandwidth, differences in pathlengths, and the power ratios of the direct to indirect waves. The frequency-correlation coefficient increases as the received bandwidth increases and decreases as the difference in pathlength increases. However, when the difference in the pathlength was small (30 m), the effect of the received bandwidth was minimal. The frequency-correlation coefficient also depended somewhat on the power ratio. To confirm the accuracy of our theoretical derivations, computer simulations were performed. Frequency-correlation coefficients were calculated by simulating instantaneous received signal levels. The theoretical results matched those of the simulation.