{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,14]],"date-time":"2025-11-14T07:35:39Z","timestamp":1763105739295,"version":"build-2065373602"},"reference-count":38,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,8,13]],"date-time":"2020-08-13T00:00:00Z","timestamp":1597276800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"the National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["No. 61873070"],"award-info":[{"award-number":["No. 61873070"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"the Technology Development Project of the China Research Institute of Radiowave Propagation","award":["No. JW2019-114"],"award-info":[{"award-number":["No. JW2019-114"]}]},{"name":"the Heilongjiang Province Key Laboratory of High Accuracy Satellite Navigation and Marine Application Laboratory","award":["No. HKL-2020-Y03"],"award-info":[{"award-number":["No. HKL-2020-Y03"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>In this paper, a non-binary low-density parity-check (NB-LDPC) coded high-order continuous phase modulation (CPM) system is designed and optimized to improve power and iterative efficiencies. Firstly, the minimum squared normalized Euclidean distance and the 99% double-sided power bandwidth are introduced to design a competitive CPM, improving its power efficiency under a given code rate and spectral efficiency. Secondly, a three-step method based on extrinsic information transfer (EXIT) and entropy theory is used to design NB-LDPC codes, which reduces the convergence threshold approximately 0.42 and 0.58 dB compared with the candidate schemes. Thirdly, an extrinsic information operation is proposed to address the positive feedback issue in iterative detection and decoding and the value of bit error rate (BER) can approximately be reduced by 5\u00d710\u22123. Finally, iteration optimization employing the EXIT chart and mutual information between demodulation and decoding is performed to achieve a suitable tradeoff for the communication reliability and iterative decoding delay. Simulation results show that the resulting scheme provides an approximately 3.95 dB coding gain compared to the uncoded CPM and achieves approximately 0.5 and 0.7 dB advantages compared with the candidate schemes. The resulting NB-LDPC-coded high-order CPM for a given code rate and spectral efficiency converges earlier into a turbo cliff region compared with other competitors and significantly improves power and iterative efficiencies.<\/jats:p>","DOI":"10.3390\/sym12081353","type":"journal-article","created":{"date-parts":[[2020,8,13]],"date-time":"2020-08-13T02:58:02Z","timestamp":1597287482000},"page":"1353","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Optimized Design for NB-LDPC-Coded High-Order CPM: Power and Iterative Efficiencies"],"prefix":"10.3390","volume":"12","author":[{"given":"Rui","family":"Xue","sequence":"first","affiliation":[{"name":"College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tong","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yanbo","family":"Sun","sequence":"additional","affiliation":[{"name":"Southwest China Institute of Electronic Technology, Chengdu 610036, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huaiyu","family":"Tang","sequence":"additional","affiliation":[{"name":"China Research Institute of Radiowave Propagation, Xinxiang 453000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,8,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"223","DOI":"10.1002\/wcm.2502","article-title":"Joint data detection and channel estimation for coded and uncoded continuous phase modulation signals","volume":"16","author":"Wang","year":"2016","journal-title":"Wirel. 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