Abstract
In orthogonal frequency division multiplexing relying on subcarrier index modulation (OFDM-SIM), the information is conveyed by both the indices of the activated subcarriers and the conventional amplitude-phase modulated (APM) symbols. It has been shown that OFDM-SIM is capable of striking a tradeoff between the attainable spectral efficiency (SE) and energy efficiency (EE). In order to further increase the EE of the OFDM-SIM system, while potentially increasing its SE, we propose a compressed sensing (CS)-assisted signaling strategy for the family of OFDM-SIM systems. Correspondingly, we first consider the joint maximum likelihood detection of the CS-assisted index-modulated (CSIM) and of the classic APM symbols, despite its high complexity. Then, we propose a low complexity detection algorithm, which is termed as the iterative residual check (IRC)-based detector. This is based on the greedy pursuit concept of CS, which makes locally optimal choices at each step. Finally, both analytical and simulation results are provided for characterizing the attainable system performance of our proposed OFDM-CSIM system. We demonstrate that in comparison to the conventional OFDM-SIM system, the proposed OFDM-CSIM arrangement is capable of achieving both a higher SE as well as an increased EE. We also show that the diversity gain provided by the OFDM-CSIM system is much higher than that of the OFDM-SIM system. Furthermore, our investigation of the detection performance shows that the proposed IRC detector is capable of providing an attractive detection performance at a low complexity.
Highlights
A paradigm shift took place from the development of spectrally efficient communication techniques to the conception of both spectral- and energy-efficient communication techniques, as detailed in [1,2,3,4,5,6]
Simulation results are provided for characterizing the achievable performance of the proposed OFDMCSIM system
Our analytical results have shown that in comparison to the conventional subcarrier IM (SIM), our proposed scheme is capable of achieving a higher spectral efficiency (SE), which has been verified by our simulation results
Summary
A paradigm shift took place from the development of spectrally efficient communication techniques to the conception of both spectral- and energy-efficient communication techniques, as detailed in [1,2,3,4,5,6]. The basic idea of CSIM is that the conventional IM is implemented in a high-dimensional virtual digitaldomain, and the high-dimensional IM symbols are compressed into the low-dimensional subcarriers in the FD with the aid of CS In this way, both the SE and EE of our proposed CSIM becomes higher than that of conventional SIM. We characterize the attainable diversity gain of both the conventional SIM and of our proposed CSIM schemes by both analytical and simulation results. IRC Detector an appealing tradeoff between SE and EE; high diversity gai...n; attractive detection performance at a low complexity; SIM. We demonstrate that an attractive detection performance can be attained by the IRC detector using as few as one or two iterations, yielding a low complexity.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
