The performance of a MIMO $4\times 4$ transmission solution applied to 4th generation LTE FDD technology are evaluated inside a reverberation chamber (RC) to quantify its benefit against the LTE typical MIMO $2\times 2$ transmission scheme, in different environment conditions. The implementation of MIMO $4\times 4$ in live networks requires the connection of two additional cables between base station transmitters and antennas, and operators face additional costs. Throughput and modulation code scheme allocation are analyzed as a function of the signal to interference-plus-noise ratio (SINR), for both indoor and outdoor environments. Experimental results in a live network are compared to those obtained in the RC of our laboratory. Results highlight that MIMO $4\times 4$ is convenient for SINR greater than 10–15 dB. These results can help mobile network operators to evaluate if the expected benefit justifies the additional costs in an operating actual network.

MIMO的性能 $4\times 4$ 在混响室内（RC）内评估了应用于第四代LTE FDD技术的传输解决方案，以量化其对LTE典型MIMO的好处 $2\times 2$传输方案，在不同的环境条件下。MIMO的实现$4\times 4$在实时网络中，需要在基站发射器和天线之间连接两条额外的电缆，并且运营商将面临额外的成本。在室内和室外环境下，都根据信号与干扰加噪声比（SINR）的函数来分析吞吐量和调制码方案分配。将实时网络中的实验结果与我们实验室的RC中获得的结果进行比较。结果突出表明MIMO$4\times 4$对于大于10–15 dB的SINR是很方便的。这些结果可以帮助移动网络运营商评估预期收益是否足以证明实际运营网络中的额外成本。