Energy Efficient Transmission over Space Shift Keying Modulated MIMO Channels

TL;DR

This paper introduces an energy-efficient spatial modulation scheme for MIMO channels, optimizing power consumption through convex design and demonstrating significant improvements over existing methods.

Contribution

It proposes a novel energy-efficient HSSK scheme using Hamming and Huffman coding, providing a theoretical bound and practical implementation for energy savings.

Findings

EE-HSSK outperforms existing schemes in energy efficiency

Theoretical bounds encompass SSK, GSSK, and HSSK schemes

Experimental results confirm near-optimal energy savings

Abstract

Energy-efficient communication using a class of spatial modulation (SM) that encodes the source information entirely in the antenna indices is considered in this paper. The energy-efficient modulation design is formulated as a convex optimization problem, where minimum achievable average symbol power consumption is derived with rate, performance, and hardware constraints. The theoretical result bounds any modulation scheme of this class, and encompasses the existing space shift keying (SSK), generalized SSK (GSSK), and Hamming code-aided SSK (HSSK) schemes as special cases. The theoretical optimum is achieved by the proposed practical energy-efficient HSSK (EE-HSSK) scheme that incorporates a novel use of the Hamming code and Huffman code techniques in the alphabet and bit-mapping designs. Experimental studies demonstrate that EE-HSSK significantly outperforms existing schemes in achieving near-optimal energy efficiency. An analytical exposition of key properties of the existing GSSK (including SSK) modulation that motivates a fundamental consideration for the proposed energy-efficient modulation design is also provided.