diversity, multiplexing and array gain

Posted 2022-12-01 爱吃猫咪的花酱

记录一个比较好的关于分集增益、复用增益以及阵列增益的描述。

The diversity gain is the improvement in link reliability obtained by receiving replicas of the information signal through(ideally independent) fading links. With an increasing number of independent copies, the probability that at least one of the signals is not experiencing a deep fade increases, thereby improving the quality and reliability of reception.

The multiplexing gain is responsible for MIMO systems offering a linear increase in the achievable data rate. Indeed, in a MIMO channel, multiple independent data streams can be transmitted within the bandwidth of operation and, under suitable channel conditions, these can be separated at the receiver. Furthermore, each data stream experiences at least the same channel quality that would be experienced by a SISO system, effectively enhancing the capacity by a multiplicative factor equal to the number of established streams.

Finally, the array gain denotes the improvement in received signal-to-noise ratio (SNR) that results from a coherent combining effect of the information signals. The coherent combining may be realized through spatial processing at the receive antenna array and/or spatial pre-processing at the transmit antenna array.

以上内容摘自：

Ordónez, Luis G., Daniel P. Palomar, and Javier R. Fonollosa. “On the diversity, multiplexing, and array gain tradeoff in MIMO channels.” 2010 IEEE International Symposium on Information Theory. IEEE, 2010.