专业英语翻译

2 性能分析及仿真结果比较

利用Matlab作为仿真工具，仿真结果如图2至图4所示。

图2表明了发射天线和接收天线数都为2（天线数目Mt=Mr=2,SNR=10dB，i.i.d.信道容量），信噪比为10dB，发射端未知信道状态信息的情况下，无线MIMO平坦衰落信道信息速率的积累分布情况。各态历经信道容量为5.7bps/Hz。各态历经信道容量是指信息速率的平均值，而不等于中断容量（5.5bps/Hz）。

图2 信道容量的累积分布曲线

图3为不同系统配置下的各态历经容量（Mt=Mr=M）。这里，各态历经容量随着信噪比和收、发天线数的增长而增长。

图3 不同天线配置的各态历经容量

2 Performance Analysis and Simulation Results Comparison

Matlab is used to a simulation tool, the simulation results in Figure 2 to figure 4.

Figure 2 illustrates the accumulation and distribution situation of flat fading channel information velocity in wireless MIMO, under the condition that the transmitting antenna and receiving antenna number is 2(the number of antennas Mt=Mr=2,SNR=10dB, i.i.d. channel capacity), signal to noise ratio is 10dB, the state information of channel unknown to the transmitter. The ergodic channel capacity is 5.7bps/Hz. The ergodic capacity is the average information rate value instead of equaling to the outage capacity.

Figure 2 Cumulative Distribution Curve of Channel Capacity

Figure 3 is the ergodic capacity under different system configurations(Mt=Mr=M). Where the ergodic capacity growth with signal to noise ratio and the number of receiving and transmitting antenna.

Figure 3 The Ergodic Capacity in Different Antenna Configuration