Abstract
Spatial modulation (SM) is a recently developed multiple-input multiple-output (MIMO) technique which offers a new tradeoff between spatial diversity and spectrum efficiency, by introducing the indices of transmit antennas as a means of information modulation. Due to the special structure of SM-MIMO, in the receiver, maximum likelihood (ML) detector can be combined with low complexity. For further improving the system performance with limited feedback, in this paper, a novel power scaling spatial modulation (PS-SM) scheme is proposed. The main idea is based on the introduction of scaling factor (SF) for weighting the modulated symbols on each transmit antenna of SM, so as to enlarge the minimal Euclidean distance of modulated constellations and improve the system performance. Simulation results show that the proposed PS-SM outperforms the conventional adaptive spatial modulation (ASM) with the same feedback amount and similar computational complexity.
Highlights
Spatial modulation (SM) [1] is a recently proposed multipleinput multiple-output (MIMO) transmission technique, in which the index of the transmit antenna is utilized for information modulation in the spatial domain
SM-MIMO can offer a new balance between spectrum efficiency and spatial diversity compared to the conventional MIMO techniques [2, 3]
A combination of adaptive spatial modulation and antenna section scheme is proposed in [9] to enhance the performance. It inherits the drawbacks of ASM, and the introduction of additional antennas will introduce extra implementation cost and channel estimation complexity. This paper considers another aspect as adaptive power scaling for SM-MIMO with limited feedback
Summary
Spatial modulation (SM) [1] is a recently proposed multipleinput multiple-output (MIMO) transmission technique, in which the index of the transmit antenna is utilized for information modulation in the spatial domain. Traditional SM-MIMO cannot exceed the ML performance bound In this case, for further improving the system performance, in recent research, limited feedback was considered for link adapted SM-MIMO. A combination of adaptive spatial modulation and antenna section scheme is proposed in [9] to enhance the performance. It inherits the drawbacks of ASM, and the introduction of additional antennas will introduce extra implementation cost and channel estimation complexity. This paper considers another aspect as adaptive power scaling for SM-MIMO with limited feedback.
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