Due to the interdependency of frame synchronization(FS)and channel estimation(CE),joint FS and CE(JFSCE)schemes are proposed to enhance their functionalities and therefore boost the overall performance of wireless com...Due to the interdependency of frame synchronization(FS)and channel estimation(CE),joint FS and CE(JFSCE)schemes are proposed to enhance their functionalities and therefore boost the overall performance of wireless communication systems.Although traditional JFSCE schemes alleviate the influence between FS and CE,they show deficiencies in dealing with hardware imperfection(HI)and deterministic line-of-sight(LOS)path.To tackle this challenge,we proposed a cascaded ELM-based JFSCE to alleviate the influence of HI in the scenario of the Rician fading channel.Specifically,the conventional JFSCE method is first employed to extract the initial features,and thus forms the non-Neural Network(NN)solutions for FS and CE,respectively.Then,the ELMbased networks,named FS-NET and CE-NET,are cascaded to capture the NN solutions of FS and CE.Simulation and analysis results show that,compared with the conventional JFSCE methods,the proposed cascaded ELM-based JFSCE significantly reduces the error probability of FS and the normalized mean square error(NMSE)of CE,even against the impacts of parameter variations.展开更多
无线光通信的信道环境复杂,易受雨、雪、雾等自然现象的影响,通常采用信道编码的方式纠正信道噪声引起的误码,信道编码有里德−所罗门(RS,Reed-Solomon)码、Turbo码、低密度奇偶校验(LDPC,low density parity check)码和极化码等多种类...无线光通信的信道环境复杂,易受雨、雪、雾等自然现象的影响,通常采用信道编码的方式纠正信道噪声引起的误码,信道编码有里德−所罗门(RS,Reed-Solomon)码、Turbo码、低密度奇偶校验(LDPC,low density parity check)码和极化码等多种类型。梳理了纠错码的发展脉络,总结了纠错码用于无线光通信的研究进展并进行对比分析,在此基础上介绍了西安理工大学在该领域的理论和实验研究进展,比较分析了RS码、Turbo码、LDPC码在雨、雪、雾环境下的纠错特性。最后,指出了该领域未来可能的研究方向和挑战,为相关领域未来的发展和研究提供参考。展开更多
基金supported in part by the Sichuan Science and Technology Program(Grant No.2023YFG0316)the Industry-University Research Innovation Fund of China University(Grant No.2021ITA10016)+1 种基金the Key Scientific Research Fund of Xihua University(Grant No.Z1320929)the Special Funds of Industry Development of Sichuan Province(Grant No.zyf-2018-056).
文摘Due to the interdependency of frame synchronization(FS)and channel estimation(CE),joint FS and CE(JFSCE)schemes are proposed to enhance their functionalities and therefore boost the overall performance of wireless communication systems.Although traditional JFSCE schemes alleviate the influence between FS and CE,they show deficiencies in dealing with hardware imperfection(HI)and deterministic line-of-sight(LOS)path.To tackle this challenge,we proposed a cascaded ELM-based JFSCE to alleviate the influence of HI in the scenario of the Rician fading channel.Specifically,the conventional JFSCE method is first employed to extract the initial features,and thus forms the non-Neural Network(NN)solutions for FS and CE,respectively.Then,the ELMbased networks,named FS-NET and CE-NET,are cascaded to capture the NN solutions of FS and CE.Simulation and analysis results show that,compared with the conventional JFSCE methods,the proposed cascaded ELM-based JFSCE significantly reduces the error probability of FS and the normalized mean square error(NMSE)of CE,even against the impacts of parameter variations.
文摘无线光通信的信道环境复杂,易受雨、雪、雾等自然现象的影响,通常采用信道编码的方式纠正信道噪声引起的误码,信道编码有里德−所罗门(RS,Reed-Solomon)码、Turbo码、低密度奇偶校验(LDPC,low density parity check)码和极化码等多种类型。梳理了纠错码的发展脉络,总结了纠错码用于无线光通信的研究进展并进行对比分析,在此基础上介绍了西安理工大学在该领域的理论和实验研究进展,比较分析了RS码、Turbo码、LDPC码在雨、雪、雾环境下的纠错特性。最后,指出了该领域未来可能的研究方向和挑战,为相关领域未来的发展和研究提供参考。
