Today, MIMO has become an indispensable scheme for providing significantspectral efficiency in wireless communication and for future wireless system,recently, it goes to two extremes: massive MIMO and single-RF MIMO. This paper,which is put in the latter, utilizes load-modulated arrays with only reactanceloads for single-RF transmission of spatially multiplexed QAM signals. Toalleviate the need for iterative processes while considering mutual coupling inthe compact antenna, we present a novel design methodology for the loadingnetwork, which enables the exact computation of the three reactance loads perantenna element and also the perfect matching to the source with theopportunity to select appropriate analog tunable loads. We verify the designmethodology by comparing the calculated values for some key parameters with thevalues from the circuit simulation. In addition, as an evaluation of theproposed architecture, we perform the bit error rate (BER) comparison whichshows that our scheme with ideal loading is comparable to the conventionalMIMO.
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