Yulong Shang

Highly spectral-efficient spatial modulation using quasi-orthogonal sequences

In this paper, we propose a new spatial modulation (SM) scheme using quaternary quasi-orthogonal sequences (Q-QOSs) for any multiples of four transmit antennas. The new scheme is an extended work of conventional Q-QOS-SM, which is designed only for antennas of powers of two. Unlike the original Q-QOS-SM, the new scheme adopts the QOS of length 4 for all applied antennas, which enables more design flexibility over an antenna size, and also guarantees much higher bit rate with given antennas. Simulation results show that the proposed scheme achieves greatly improved throughput compared to conventional other schemes for all simulation cases.

A new spatial modulation scheme based on quasi-orthogonal sequences

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 shown to achieve much higher bit throughput than the existing SM and generalized SM schemes for all simulation cases.

New hardware-efficient ML detection for spatial modulation scheme

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 is mainly because the complexity of the slicer is practically negligible without regard to a modulation order.

New PAPR reduction method for spatial modulation using an unitary precoder

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 with almost same decoding complexity. When using a nonideal amplifier, the proposed method is shown to exhibit significant performance improvement, especially, for high input-back-off and a large number of antennas.