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In this paper, we propose a new spatial modulation (SM) scheme based on quaternary quasi-orthogonal sequences (Q-QOSs), referred to as Q-QOS-SM. Unlike an original SM scheme, the proposed scheme uses the indices of the Q-QOSs for mapping of input bits, resulting in two times more bits to be allocated to an antenna-selection part compared to the original SM. From simulation results, the Q-QOS-SM is...
In this paper, we propose a new hardware-efficient ML decoding algorithm for a spatial modulation scheme which is basically constructed by serially concatenating maximum-ratio receive combiners with traditional slicers. With respect to complex multiplications, the new algorithm has a greatly reduced decoding complexity compared to the conventional one, especially, for higher-order modulation. This...
In this paper, a new peak-to-average power ratio reduction method for spatial modulation is presented. This is done by multiplying an unitary precoder to modulated signals so that total transmit energy is uniformly scattered into all transmit antennas. When using an ideal amplifier, the proposed method guarantees performance identical with the conventional scheme due to the orthogonality of the precoder...
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