空间相关性对水声多输入多输出系统信道容量的影响

通过三维多径相关模型,以垂直收发阵为例研究了信道参数如声线角度扩展范围、到达方向和收发阵元间距对水声MIMO信道容量的影响。如果考虑静止的收发阵,且不考虑信道中散射体的运动时,MIMO系统的信道容量由收发阵元信号的空间相关性决定,当空间相关性较小时,增加收发阵元数可以带来较大的信道容量增益,而当空间相关性较大时,随着收发阵元数的增加信道容量将趋于饱和。

Effect of spatial correlation on underwater acoustic MIMO capacity

The effect of channel parameters such as angle spread, angle of arrival, and array ele-ment spacing on the underwater acoustic MIMO capacity is studied with a three-dimensional multipath correlation model using a vertical transmitting and receiving array. In a MIMO system with static transmitting and receiving arrays, regardless of the movement of scatters in the underwater acoustic channel, the capacity is dependent on the spatial correlation among array element signals at the transmitter as well as at the receiver. If correlation between elements of the channel matrix is weak, increasing the number of array elements will greatly increase the MIMO capacity. In a channel of strong correlation, increasing the number of array elements will cause the MIMO cap-acity to approach saturation.