Abstract
The performance of spatial modulation (SM) is known to depend on the minimum Euclidean distance in the received SM constellation. In this letter, a symbol scaling technique is proposed for spatial modulation in the multiple-input-single-output (MISO) channel that enhances this minimum distance. It achieves this by aligning the phase of the relevant channels so that the received symbol phases are distributed in uniformly spaced angles in the received SM constellation. In contrast to existing amplitude-phase scaling schemes that are data-dependent and involve an increase in the transmitted signal power for ill conditioned channels, here a phase-only shift is applied. This allows for data-independent, fixed per-antenna scaling and leaves the symbol power unchanged. The results show an improved SM performance and diversity for the proposed scheme compared to existing amplitude-phase scaling techniques.
Highlights
T RADITIONAL spatial multiplexing has been shown to improve the capacity of the wireless channel by exploiting multi-antenna transmitters [1]
It’s two central benefits include the absence of inter-channel interference (ICI) and the fact that it only requires a subset of Radio Frequency (RF) chains compared to spatial multiplexing, for the transmission of data
Recent work has focused on constellation shaping for Spatial Modulation (SM) by means of symbol pre-scaling at the transmitter, aiming to maximize the minimum Euclidean distance in the received SM constellation [7], [8], [9]
Summary
T RADITIONAL spatial multiplexing has been shown to improve the capacity of the wireless channel by exploiting multi-antenna transmitters [1]. Recent work has focused on constellation shaping for SM by means of symbol pre-scaling at the transmitter, aiming to maximize the minimum Euclidean distance in the received SM constellation [7], [8], [9]. This is known to be central to the performance of SM detection. Using the existing amplitude-phase structure of the MISO channel, here the aim is to shape the receive SM symbols so that the angles of the constellation points are uniformly spaced within the [0, 2π) spread in the received constellation This statistically enhances the minimum Euclidean distance in the constellation. The proposed pre-scaling provides better performance than the existing approaches for an equal transmit power
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