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A comparison of ESPAR-MIM O and LMA-MIMO for single-RF transmission of spatially multiplexed QAM Signals

By use of electronically steerable parasitic array radiators (ESPAR) antenna and load modulated array (LMA) antenna, single-RF MIMO transmission has been proposed to support spatially multiplexed QAM signals with the benefits of hardware complexity, size and cost. In this paper, we compare our LMA-MIMO with ESPAR-MIMO in terms of the dissipated power, circuit robustness, and bit error rate performance. Owing to both pure reactance and phase control loading as well as self-matched impedance loading, we show that the LMA-MIMO outperforms the ESPAR-MIMO by reduction of 50∼81% in power consumption and 5.3∼41.8% in BER without any problems of the circuit oscillation.