Abstract: In cellular systems, the performance degradation caused by multi-path fading may be reduced by applying diversity antennas at base stations (BS) to recover the signals received on uplink. But the characteristics of the fading signals received on different antennas may be somehow correlative when the distance between antennas are constrained, thus the anticipated diversity gain may not always be obtainable. This paper proposes a modified multi-path uplink channel model based on the local scattering phenomena aroused around the mobile station. The effects of different channel model setups on the system performance are analyzed by purposeful simulations in the frame of the channel model proposed. Furthermore, this paper also proposes an effective numeric approach to calculate the BER performance in correlated Gaussian fading channel, given the correlation matrix of the channel.

Key words: multi-path fading, diversity antenna, BER calculation

摘要： 给出了一个蜂窝通信中基站空间分集接收的信道模型，并采用此模型通过仿真研究了不同天线上信号衰落的相关性及其对接收机性能的影响。此外，还给出了在已知相关矩阵的条件下，分集接收机平均误码率的数值计算方法，与通常计算误码率采用的蒙特卡罗仿真方法相比大大地降低了运算量。

关键词: 多径衰落, 分集天线, 误码率计算