{"title":"Constellation Constraint-Based Superposed 32QAM Scheme for NOMA System","authors":"Chuxian Wang;Honghao Shi;Zhiyong Luo","doi":"10.1109/LCOMM.2024.3503285","DOIUrl":null,"url":null,"abstract":"In this letter, an odd-order superposed modulation scheme is studied in non-orthogonal multiple access (NOMA) system. Firstly, we design a novel superposed 32-quadrature amplitude modulation (QAM) constellation superposed by a novel 8QAM and quadrature phase shift keying (QPSK), where joint coding between QPSK and 8QAM is performed for 8QAM signal rotation. Then, a simplified optimal power allocation algorithm is given by maximizing the constellation constrained (CC) capacity at high SNR for obtaining optimal superposed constellation. Comparing with the superposed 32-phase-shift keying (PSK) scheme, our proposed scheme employing successive interference cancellation (SIC) for detection has a lower decoding complexity. Moreover, a wider power coefficient ratio range at the threshold of mutual information (MI) greater than 4.98 is achieved by our proposed scheme. It also demonstrates that the MI and BER performances of proposed scheme outperform than those of the other three schemes when the power coefficient ratio is optimal at high signal-to-noise ratio (SNR).","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 1","pages":"120-124"},"PeriodicalIF":3.7000,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10758828/","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"TELECOMMUNICATIONS","Score":null,"Total":0}
引用次数: 0
Abstract
In this letter, an odd-order superposed modulation scheme is studied in non-orthogonal multiple access (NOMA) system. Firstly, we design a novel superposed 32-quadrature amplitude modulation (QAM) constellation superposed by a novel 8QAM and quadrature phase shift keying (QPSK), where joint coding between QPSK and 8QAM is performed for 8QAM signal rotation. Then, a simplified optimal power allocation algorithm is given by maximizing the constellation constrained (CC) capacity at high SNR for obtaining optimal superposed constellation. Comparing with the superposed 32-phase-shift keying (PSK) scheme, our proposed scheme employing successive interference cancellation (SIC) for detection has a lower decoding complexity. Moreover, a wider power coefficient ratio range at the threshold of mutual information (MI) greater than 4.98 is achieved by our proposed scheme. It also demonstrates that the MI and BER performances of proposed scheme outperform than those of the other three schemes when the power coefficient ratio is optimal at high signal-to-noise ratio (SNR).
期刊介绍：
The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.
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