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A Novel RIS-Aided Code Index Modulation Scheme With Low-Complexity Detection
- Source :
- IEEE Transactions on Vehicular Technology; November 2023, Vol. 72 Issue: 11 p14279-14288, 10p
- Publication Year :
- 2023
-
Abstract
- In order to achieve high throughput and low-power consumption of the transmitter and improve the error performance of the receiver, a novel reconfigurable intelligent surface (RIS)-aided code index modulation (RIS-CIM) is proposed in wireless communications. RIS-CIM utilizes the index of a spreading code to convey additional information, which further improves the spectral efficiency (SE) and error performance of the receiver by adding and adjusting the reflected phase shift of low-cost reflective elements at the RIS-aided relay. To reduce the computational complexity incurred by the maximum likelihood (ML) detection, we propose two low-complexity detections, namely the match correlation (MC) detection and the optimal low complexity (OLC) detection. MC and OLC approaches separate the dispreading from the demodulation in the detection, which achieves a significant reduction of the computational complexity over ML detection demonstrated by the analysis of the computational complexity measurements. We present a thorough analysis for the upper bound on the average bit error probability (ABEP) of the ML detection and the bit error probability (BEP) of the OLC detection of RIS-CIM, which is verified by numerical simulations. Numerical simulations also demonstrate that the proposed RIS-CIM performs better in terms of the error performance of ML detection than several existing CIM and RIS-related schemes at a given SE setting. In addition, the proposed ML and OLC detections achieve an error performance close to the ML detection under various measures of signal-to-noise ratio (SNR) and the increasing SE in the simulations. Moreover, RIS-CIM can utilize a large number of reflective elements at the RIS-aided relay to offset the performance degradation caused by the improvement of SE.
Details
- Language :
- English
- ISSN :
- 00189545
- Volume :
- 72
- Issue :
- 11
- Database :
- Supplemental Index
- Journal :
- IEEE Transactions on Vehicular Technology
- Publication Type :
- Periodical
- Accession number :
- ejs64518945
- Full Text :
- https://doi.org/10.1109/TVT.2023.3281636