Phase Shift Keying on the Hypersphere: Peak Power-Efficient MIMO Communications
Abstract
Phase Shift Keying on the Hypersphere (PSKH), a generalization of conventional Phase Shift Keying (PSK) for Multiple-Input Multiple-Output (MIMO) systems, is introduced. In PSKH, constellation points are distributed on a multidimensional hypersphere. The use of such constellations with a Peak-To-Average-Sum-Power-Ratio (PASPR) of 1 allows to use load-modulated transmitters which can cope with a small backoff, which in turn results in a high power efficiency. In this paper, we discuss several methods how to generate PSKH constellations and compare their performance. After applying conventional Pulse-Amplitude Modulation (PAM), the PASPR of the continuous time PSKH signal depends on the choice of the pulse shaping method. This choice also influences bandwidth and power efficiency of a PSKH system. In order to reduce the PASPR of the continuous transmission signal, we use spherical interpolation to generate a smooth signal over the hypersphere and present corresponding receiver techniques. Additionally, complexity reduction techniques are proposed and compared. Finally, we discuss the methods presented in this paper regarding their trade-offs with respect to PASPR, bandwidth, power efficiency and receiver complexity.
Keywords
Cite
@article{arxiv.1611.01009,
title = {Phase Shift Keying on the Hypersphere: Peak Power-Efficient MIMO Communications},
author = {Christoph Rachinger and Ralf R. Müller and Johannes B. Huber},
journal= {arXiv preprint arXiv:1611.01009},
year = {2016}
}
Comments
This paper has been submitted to IEEE Transactions on Wireless Communications