A 0.7-2.5 GHz, 61% EIRP System Efficiency, Four-Element MIMO TX System Exploiting Integrated Power-Relaxed Power Amplifiers and an Analog Spatial De-Interleaver.

This paper describes a four-element multiple-input multiple-output (MIMO) transmitter (TX) system that features an analog spatial de-interleaver to simplify the baseband-input complexity and increase the spatial matching of the sub-TXs. The MIMO diversity gain and power-combining gain are jointly exploited to relax the output power of the four power amplifiers and eliminate their output matching n...