介绍了几种面向5G的新型多载波传输技术:滤波器组多载波(FBMC,Filter Bank Multicarrier)、通用滤波多载波(UFMC,Universal Filtered Multicarrier)和广义频分复用(GFDM,Generalized Frequency Division Multiplexing)的基本原理,并从...介绍了几种面向5G的新型多载波传输技术:滤波器组多载波(FBMC,Filter Bank Multicarrier)、通用滤波多载波(UFMC,Universal Filtered Multicarrier)和广义频分复用(GFDM,Generalized Frequency Division Multiplexing)的基本原理,并从第五代移动通信系统(5G)支持的应用场景和技术需求的角度对三种多载波传输技术的优缺点进行比较。研究表明三种多载波传输技术的带外泄露较低,FBMC系统不使用CP(CP,Cyclic Prefix),因此具有很高的时频效率,但FBMC系统帧的长度比较长,不适合短包类业务;UFMC对一组连续的子载波滤波,可以支持较短的帧结构,但UFMC不使用CP,复杂度较高;GFDM基于独立的块调制,具有灵活的帧结构,鲁棒性好,复杂度比前两者低,便于实际应用。展开更多
This paper gives an outline of the algorithms and implementation of the main signal processing techniques being developed for 5G wireless communication. The first part contains a review and comparison of six orthogona...This paper gives an outline of the algorithms and implementation of the main signal processing techniques being developed for 5G wireless communication. The first part contains a review and comparison of six orthogonal and nonorthogonal waveformgeneration and modulation schemes： generalized frequencydivision multiplexing （GFDM）, filterbank multicarrier （FBMC）, universal filtered multicarrier （UFMC）, biorthogonal frequencydivision multiplexing （BFDM）, sparsecode multipleaccess （SCMA）, and nonorthogonal multiple access （NOMA）. The second part discusses spatial signal processing algorithms and implementations for massive multipleinput multipleoutput （massiveMIMO）, 3D beamforming and diversity, and orbital angular momentum （OAM） based multiplexing. The last part gives an overview of signal processing aspects of other emerging techniques in 5G, such as millimeterwave, cloud radio access networks, full duplex mode, and digital radiofrequency processing.展开更多
正交频分复用技术(orthogonal frequency division multiplex,OFDM)能够有效的消除电力线信道中的频率选择性干扰、脉冲噪声干扰以及多径时延等不良影响,已成为现有电力线通信系统(power line communication,PLC)物理层调制编码的主要...正交频分复用技术(orthogonal frequency division multiplex,OFDM)能够有效的消除电力线信道中的频率选择性干扰、脉冲噪声干扰以及多径时延等不良影响,已成为现有电力线通信系统(power line communication,PLC)物理层调制编码的主要技术手段。但OFDM技术仍存在因添加循环前缀(cyclic prefix,CP)导致的频谱利用率受限、高峰值功率比、严格正交性约束下的同步解调等问题。研究了一种广义频分复用技术(GFDM,generalized frequency division multiplex)在电力线通信中的低复杂度模型及其应用方案,采用非矩形脉冲成型滤波器组,降低了带外频谱泄露,通过数据帧中使用更少的CP,提高了频谱利用率。仿真结果表明,在正交性与同步解调要求较低的情况下,基于GFDM的PLC系统错误率(symbol error rate,SER)性能与正交的OFDM系统性能十分接近,且其带外功率泄露明显降低。展开更多
为解决广义频分复用(Generalized Frequency Division Multiplexing,GFDM)系统中由于高功率放大器(High Power Amplifier,HPA)引起的非线性失真,在考虑放大器测量噪声的情况下,提出了一种基于实部反馈和列文伯格-马奎尔特算法(Real Valu...为解决广义频分复用(Generalized Frequency Division Multiplexing,GFDM)系统中由于高功率放大器(High Power Amplifier,HPA)引起的非线性失真,在考虑放大器测量噪声的情况下,提出了一种基于实部反馈和列文伯格-马奎尔特算法(Real Valued Feedback Levenberg-Marquard Predistortion,R-LM-PD)的自适应预失真方案。该方案采用记忆多项式模型(Memory Polynomial,MP)模拟HPA的逆函数,只利用输出反馈信号和期望信号的实部分量计算预失真器系数。同时,该方案选择收敛速度快、精确度高的LM算法进行参数辨识。仿真结果表明,该方案相比传统直接学习结构可以减少一个反馈支路,在信噪比为16 dB时,误比特率可达到5.1×10^(-6),归一化均方误差相较无预失真时降低了约17 dB。与现有的一些补偿方案相比,该方案具有更好的线性化和抗噪声性能。展开更多
Low-resolution analog-to-digital converter(ADC)is a promising solution to reduce hardware cost and power consumption in generalized frequency division multiplexing(GFDM)systems.The severe nonlinear distortion of ADCs ...Low-resolution analog-to-digital converter(ADC)is a promising solution to reduce hardware cost and power consumption in generalized frequency division multiplexing(GFDM)systems.The severe nonlinear distortion of ADCs and the non-orthogonality of GFDM make receiver design a great challenge.In this paper,we propose a novel model-driven receiver architecture for GFDM with low-resolution ADCs.Orthogonal approximate message passing(OAMP)framework is combined with the classical linear estimator in this work to create a robust iterative receiver for GFDM systems with low-precision ADCs.The corresponding model-driven network is organized based on the proposed novel iterative algorithm according to the procedures of the receiver.The network of OAMP can reduce the gap between the approximate algorithm and the Bayesian optimal result due to the information loss of ADCs.The signal flow of the neural network is designed by unfolding the iterative algorithms for channel estimation and data detection.Numerical results are provided to show that the proposed OAMP-based receiver algorithm outperforms traditional receivers and the model-driven network can further improve the system performance on the basis of the corresponding novel algorithm.展开更多
新一代海上安全信息广播系统(Navigational Data,NAVDAT)采用正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术实现高速率数字广播,然而,带外辐射以及由海上通信节点的运动和电离层运动引发的频率偏移等问题限制了...新一代海上安全信息广播系统(Navigational Data,NAVDAT)采用正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术实现高速率数字广播,然而,带外辐射以及由海上通信节点的运动和电离层运动引发的频率偏移等问题限制了其性能的进一步提升。针对上述问题,探讨了滤波器组多载波(Filter Bank Multicarrier,FBMC)、广义频分复用(Generalized Frequency Division Multiplexing,GFDM)、通用滤波多载波(Universal Filtered Multicarrier,UFMC)三种未来移动通信参考波形在NAVDAT系统中的应用前景,给出了三种波形调制解调原理,阐明了其优缺点,并对其在海上无线信道下的系统性能进行了仿真分析。分析结果表明,相比于OFDM,三种参考波形具有更低的带外辐射和更高的频谱效率,可进一步提升NAVDAT系统的数据传输速率。此外,UFMC和FBMC可以有效对抗海上无线信道的频率偏移问题。然而,与现有OFDM技术相比,三种波形面临兼容性差、抗干扰能力差、复杂度高等挑战。最后,基于分析结果给出了未来的研究方向。展开更多
广义频分复用(Generalized Frequency Division Multiplex,GFDM)技术作为新的多载波技术,凭借其子载波非正交性、时频资源的灵活性等特点成为研究热点。为了抵抗空空数据链中目标高速移动导致的多普勒频移,首次将GFDM技术引入空空数据链...广义频分复用(Generalized Frequency Division Multiplex,GFDM)技术作为新的多载波技术,凭借其子载波非正交性、时频资源的灵活性等特点成为研究热点。为了抵抗空空数据链中目标高速移动导致的多普勒频移,首次将GFDM技术引入空空数据链中,对空空数据链下GFDM系统的多普勒进行性能分析,对比特出错概率(Bit Error Ratio,BER)进行性能仿真。结果表明,GFDM技术有对抗多普勒频偏的能力。展开更多
文摘介绍了几种面向5G的新型多载波传输技术:滤波器组多载波(FBMC,Filter Bank Multicarrier)、通用滤波多载波(UFMC,Universal Filtered Multicarrier)和广义频分复用(GFDM,Generalized Frequency Division Multiplexing)的基本原理,并从第五代移动通信系统(5G)支持的应用场景和技术需求的角度对三种多载波传输技术的优缺点进行比较。研究表明三种多载波传输技术的带外泄露较低,FBMC系统不使用CP(CP,Cyclic Prefix),因此具有很高的时频效率,但FBMC系统帧的长度比较长,不适合短包类业务;UFMC对一组连续的子载波滤波,可以支持较短的帧结构,但UFMC不使用CP,复杂度较高;GFDM基于独立的块调制,具有灵活的帧结构,鲁棒性好,复杂度比前两者低,便于实际应用。
文摘This paper gives an outline of the algorithms and implementation of the main signal processing techniques being developed for 5G wireless communication. The first part contains a review and comparison of six orthogonal and nonorthogonal waveformgeneration and modulation schemes： generalized frequencydivision multiplexing （GFDM）, filterbank multicarrier （FBMC）, universal filtered multicarrier （UFMC）, biorthogonal frequencydivision multiplexing （BFDM）, sparsecode multipleaccess （SCMA）, and nonorthogonal multiple access （NOMA）. The second part discusses spatial signal processing algorithms and implementations for massive multipleinput multipleoutput （massiveMIMO）, 3D beamforming and diversity, and orbital angular momentum （OAM） based multiplexing. The last part gives an overview of signal processing aspects of other emerging techniques in 5G, such as millimeterwave, cloud radio access networks, full duplex mode, and digital radiofrequency processing.
文摘正交频分复用技术(orthogonal frequency division multiplex,OFDM)能够有效的消除电力线信道中的频率选择性干扰、脉冲噪声干扰以及多径时延等不良影响,已成为现有电力线通信系统(power line communication,PLC)物理层调制编码的主要技术手段。但OFDM技术仍存在因添加循环前缀(cyclic prefix,CP)导致的频谱利用率受限、高峰值功率比、严格正交性约束下的同步解调等问题。研究了一种广义频分复用技术(GFDM,generalized frequency division multiplex)在电力线通信中的低复杂度模型及其应用方案,采用非矩形脉冲成型滤波器组,降低了带外频谱泄露,通过数据帧中使用更少的CP,提高了频谱利用率。仿真结果表明,在正交性与同步解调要求较低的情况下,基于GFDM的PLC系统错误率(symbol error rate,SER)性能与正交的OFDM系统性能十分接近,且其带外功率泄露明显降低。
基金This work was supported in part by the National Key Research and Development Program(2018YFA0701602)the National Natural Science Foundation of China for Distinguished Young Scholars of China(Nos.61625106,61531011)+1 种基金The work of C.K.Wen was supported in part by the Ministry of Science and Technology of Taiwan(MOST 106-2221-E-110-019)the ITRI in Hsinchu,Taiwan,China。
文摘Low-resolution analog-to-digital converter(ADC)is a promising solution to reduce hardware cost and power consumption in generalized frequency division multiplexing(GFDM)systems.The severe nonlinear distortion of ADCs and the non-orthogonality of GFDM make receiver design a great challenge.In this paper,we propose a novel model-driven receiver architecture for GFDM with low-resolution ADCs.Orthogonal approximate message passing(OAMP)framework is combined with the classical linear estimator in this work to create a robust iterative receiver for GFDM systems with low-precision ADCs.The corresponding model-driven network is organized based on the proposed novel iterative algorithm according to the procedures of the receiver.The network of OAMP can reduce the gap between the approximate algorithm and the Bayesian optimal result due to the information loss of ADCs.The signal flow of the neural network is designed by unfolding the iterative algorithms for channel estimation and data detection.Numerical results are provided to show that the proposed OAMP-based receiver algorithm outperforms traditional receivers and the model-driven network can further improve the system performance on the basis of the corresponding novel algorithm.
文摘新一代海上安全信息广播系统(Navigational Data,NAVDAT)采用正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术实现高速率数字广播,然而,带外辐射以及由海上通信节点的运动和电离层运动引发的频率偏移等问题限制了其性能的进一步提升。针对上述问题,探讨了滤波器组多载波(Filter Bank Multicarrier,FBMC)、广义频分复用(Generalized Frequency Division Multiplexing,GFDM)、通用滤波多载波(Universal Filtered Multicarrier,UFMC)三种未来移动通信参考波形在NAVDAT系统中的应用前景,给出了三种波形调制解调原理,阐明了其优缺点,并对其在海上无线信道下的系统性能进行了仿真分析。分析结果表明,相比于OFDM,三种参考波形具有更低的带外辐射和更高的频谱效率,可进一步提升NAVDAT系统的数据传输速率。此外,UFMC和FBMC可以有效对抗海上无线信道的频率偏移问题。然而,与现有OFDM技术相比,三种波形面临兼容性差、抗干扰能力差、复杂度高等挑战。最后,基于分析结果给出了未来的研究方向。
