H-MRT/ZF: A Tradeoff between MRT and ZF
Maximum Ratio Transmission (MRT) over several channels maximizes the receive Signal-to-Noise Ratio (SNR). However, in a broadcasting (multiple access) network, MRT will introduce interference between different links. On the other hand, Zero-Forcing (ZF) transmission creates an interference-free channel for each link at the expense of the receive SNR. It can be observed that MRT and ZF represent two extreme points in the tradeoff between SNR and interference, where the former maximizes the SNR while the latter minimizes the interference.