DFT-Based Wideband Line-of-Sight MIMO Communication

A solution is presented to the spatial-wideband effect in line-of-sight multiple-input multiple-output transmission. This effect, which arises once the bandwidth is large enough that the propagation delay differences for distinct transmit-receive antenna pairs become comparable to the symbol period, causes frequency selectivity and intersymbol interference. The proposed solution, which only entails channel-independent DFT precoding and reception, plus delay lines, performs close to capacity for most array orientations and is compatible with both multicarrier and single-carrier signals.