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This paper considers a novel Multiple-Input Multiple-Output (MIMO) architecture, which combines the signals in the Radio-Frequency (RF) domain. Unlike previous approaches, the proposed architecture is exclusively based on the application of different gain factors to the transmitted/received signals, and therefore it avoids the need of including a controllable phase-shifter (or sign switch) for each transmit/receive antenna. From a baseband point of view, the transceiver design consists in obtaining the optimal Equal Phase Transmit (EPT) and Equal-Phase Combining (EPC) beam-formers. Interestingly, this problem can be exactly solved in the case of rank-one channels, which can be exploited to construct an iterative algorithm for the general MIMO case.
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