TY - JOUR
T1 - Opportunistic Spectrum Sharing Based on OFDM with Index Modulation
AU - Li, Qiang
AU - Wen, Miaowen
AU - Dang, Shuping
AU - Basar, Ertugrul
AU - Poor, H. Vincent
AU - Chen, Fangjiong
N1 - Funding Information:
Manuscript received February 12, 2019; revised July 14, 2019 and September 11, 2019; accepted September 18, 2019. Date of publication October 1, 2019; date of current version January 8, 2020. This work was supported in part by the National Natural Science Foundation of China under Grant 61871190, Grant 61671211, and Grant U1701265, in part by the Natural Science Foundation of Guangdong under Grant 2018B030306005, Grant 2016A030311024, and Grant 2016A030308006, in part by the State Key Laboratory of Integrated Service Networks of Xidian University under Grant ISN20-16, in part by the Pearl River Nova Program of Guangzhou under Grant 201806010171, in part by Turkish Academy of Sciences, in part by the U.S. National Science Foundation under Grants CCF-0939370 and CCF-1513915, and in part by the China Scholarship Council under Grant 201806150074. The associate editor coordinating the review of this article and approving it for publication was Prof. G. C. Alexandropoulos. (Corresponding author: Miaowen Wen.) Q. Li and M. Wen are with the School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China, and also with the State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China (e-mail: eeqiangli@mail.scut.edu.cn; eemwwen@scut.edu.cn).
PY - 2020/1
Y1 - 2020/1
N2 - In this paper, a novel opportunistic spectrum sharing scheme, based on orthogonal frequency division multiplexing with index modulation (OFDM-IM), is proposed for cognitive radio (CR) networks. In the considered OFDM-IM based CR (OFDM-IM-CR) model, the primary transmitter (PT) communicates with the primary receiver with the aid of an amplify-and-forward (AF) relay by transmitting OFDM-IM signals. Meanwhile, the secondary transmitter (ST) passively senses the spectrum and transmits its own information over those inactive subcarriers of the primary network to the secondary receiver if the signal-to-noise ratio of the PT to ST link is above a predefined threshold; otherwise, the ST stays in silent mode. Two different types of maximum-likelihood (ML) detectors are designed for the primary network, based on the knowledge of either the estimated channel state information or the statistical channel information of the secondary network. A complexity-reducing method, which is applicable to both types and achieves near optimal performance, is further proposed. To evaluate the performance, a tight upper bound on the bit error rate (BER) is derived, assuming the first type of ML detection. Simulation results corroborate the analysis and show that OFDM-IM-CR has the potential of outperforming OFDM-CR and OFDM-IM-AF in terms of BER with higher spectral efficiency.
AB - In this paper, a novel opportunistic spectrum sharing scheme, based on orthogonal frequency division multiplexing with index modulation (OFDM-IM), is proposed for cognitive radio (CR) networks. In the considered OFDM-IM based CR (OFDM-IM-CR) model, the primary transmitter (PT) communicates with the primary receiver with the aid of an amplify-and-forward (AF) relay by transmitting OFDM-IM signals. Meanwhile, the secondary transmitter (ST) passively senses the spectrum and transmits its own information over those inactive subcarriers of the primary network to the secondary receiver if the signal-to-noise ratio of the PT to ST link is above a predefined threshold; otherwise, the ST stays in silent mode. Two different types of maximum-likelihood (ML) detectors are designed for the primary network, based on the knowledge of either the estimated channel state information or the statistical channel information of the secondary network. A complexity-reducing method, which is applicable to both types and achieves near optimal performance, is further proposed. To evaluate the performance, a tight upper bound on the bit error rate (BER) is derived, assuming the first type of ML detection. Simulation results corroborate the analysis and show that OFDM-IM-CR has the potential of outperforming OFDM-CR and OFDM-IM-AF in terms of BER with higher spectral efficiency.
KW - Amplify-and-forward relaying
KW - OFDM
KW - cognitive radio
KW - index modulation
KW - spectrum sharing
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U2 - 10.1109/TWC.2019.2943159
DO - 10.1109/TWC.2019.2943159
M3 - Article
AN - SCOPUS:85072984235
VL - 19
SP - 192
EP - 204
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
SN - 1536-1276
IS - 1
M1 - 8854299
ER -