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
In past decades, there has been a growing interest in the discussion and study of using underwater acoustic channel as the physical layer for communication systems, ranging from point-to-point communications to underw...In past decades, there has been a growing interest in the discussion and study of using underwater acoustic channel as the physical layer for communication systems, ranging from point-to-point communications to underwater multicarrier modulation networks. A series of review papers were already available to provide a history of the development of the field until the end of the last decade. In this paper, we attempt to provide an overview of the key developments, both theoretical and applied, in the particular topics regarding multicarrier communication for underwater acoustic communication such as the channel and Doppler shift estimation, video and image transmission throw multicarrier techniques, etc. This paper also includes acoustic propagation properties in seawater and underwater acoustic channel representation.展开更多
In the forthcoming 5G systems, new technologies, such as amorphous networks and non-orthogonal filter bank multicarriers(FBMC), provide an effective way to accommodate high-rate transmissions. Meanwhile, the prototype...In the forthcoming 5G systems, new technologies, such as amorphous networks and non-orthogonal filter bank multicarriers(FBMC), provide an effective way to accommodate high-rate transmissions. Meanwhile, the prototype filter affects the adjacent channel interference, and therefore is important for FBMC systems. Besides, once the amorphous network is taken into account, the requirement for interference controlmust be much stricter. Accordingly, this paper focuses on the design of prototype filter with better ability of interference controlling, where we exploit the nonlinear phase FIR filter(NLPFF) instead of traditional linear phase FIR filter(LPFF) to achieve more optimization spaces under a small sacrifice of linear phase. In ourdesigns, both the amplitude and phase responsesare handled independently to approach the stopband performance enhancements, in while the nearly perfect reconstruction(NPR) conditionsare relaxed by pre-specified thresholds. Computer simulations confirm the effectiveness of the NLPFF designs, and demonstrate the advantages of the proposed NLPFF in FBMC applications.展开更多
针对滤波器组多载波(Filter Bank Multicarrier,FBMC)系统的信道估计问题,对系统进行了简要介绍并提出一种基于线性最小均方误差(Liner Minimum Mean-Square Error,LMMSE)算法改进的信道估计算法。在原有的LMMSE算法基础上结合离散傅里...针对滤波器组多载波(Filter Bank Multicarrier,FBMC)系统的信道估计问题,对系统进行了简要介绍并提出一种基于线性最小均方误差(Liner Minimum Mean-Square Error,LMMSE)算法改进的信道估计算法。在原有的LMMSE算法基础上结合离散傅里叶变换(Discrete Fourier Transform,DFT)算法,并进行迭代估计,同时利用奇异值分解(Singular Value Decomposition,SVD)算法降低了计算的复杂度。仿真结果表明,改进的LMMSE算法明显提高了系统的性能。展开更多
Filter-bank multicarrier （FBMC） with offset quadrature amplitude modulation （OQAM） is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing ...Filter-bank multicarrier （FBMC） with offset quadrature amplitude modulation （OQAM） is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing （OFDM） systems. However, because of or-thogonality in real field and the presence of imaginary intrinsic interference, channel estimation in FBMC is not as straightforward as OFDM systems especially in multiple antenna scenarios. In this paper, we propose a channel estimation method which employs intrinsic interference cancellation at the transmitter side. The simulation results show that this method has less pilot overhead, less peak to average power ratio （PAPR）, better bit error rate （BER）, and better mean square error （MSE） performance compared to the well-known intrinsic approximation methods （IAM）.展开更多
考虑到现实水声通信环境中存在非连续频带干扰导致系统的接收端误码率较高的问题,本文提出一种基于索引调制的FBMC水声抗干扰通信(filter bank multi-carrier with index modulation, FBMC-IM)技术研究方案。首先分析无干扰情况下,水声F...考虑到现实水声通信环境中存在非连续频带干扰导致系统的接收端误码率较高的问题,本文提出一种基于索引调制的FBMC水声抗干扰通信(filter bank multi-carrier with index modulation, FBMC-IM)技术研究方案。首先分析无干扰情况下,水声FBMC-IM通信系统误码率性能要优于传统FBMC系统。根据非连续频带干扰频率范围,对水声FBMC-IM系统的通信频带进行划分,使得与非连续频带干扰信号混叠部分的子载波静默,未受干扰的子载波保持活跃状态并承载通信信号,实现不连续的通信频带划分来规避干扰的影响。仿真实验结果表明,该方案明显降低了系统接收端的误码率,提高了系统的抗干扰能力。展开更多
There are numerous goals in next-generation cellular networks(5G),which is expected to be available soon.They want to increase data rates,reduce end-to-end latencies,and improve end-user service quality.Modern network...There are numerous goals in next-generation cellular networks(5G),which is expected to be available soon.They want to increase data rates,reduce end-to-end latencies,and improve end-user service quality.Modern networks need to change because there has been a significant rise in the number of base stations required to meet these needs and put the operators’low-cost constraints to the test.Because it can withstand interference from other wireless networks,and Adaptive Complex Multicarrier Modulation(ACMM)system is being looked at as a possible choice for the 5th Generation(5G)of wireless networks.Many arithmetic units need to be used on the hardware side of multicarrier systems to do the pulse-shaping filters and inverse FFT.The main goal of this study is to adapt complex multicarrier modulation(ACMM)for baseband transmission with low complexity and the ability to change it.We found that this is the first recon-figurable architecture that lets you choose how many subcarriers a subband has while still having the same amount of hardware resources as before.Also,under the new design with a single selection line,it selects from a set of filters.The baseband modulating signal is evaluated and tested using a Field-Programmable Gate Array(FPGA)device.This device is available from a commercial source.New technology outperforms current technology in terms of computational com-plexity,simple design,and ease of implementation.Additionally,it has a higher power spectrum density,spectral efficiency,a lower bit error rate,and a higher peak to average power ratio than existing technology.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In past decades, there has been a growing interest in the discussion and study of using underwater acoustic channel as the physical layer for communication systems, ranging from point-to-point communications to underwater multicarrier modulation networks. A series of review papers were already available to provide a history of the development of the field until the end of the last decade. In this paper, we attempt to provide an overview of the key developments, both theoretical and applied, in the particular topics regarding multicarrier communication for underwater acoustic communication such as the channel and Doppler shift estimation, video and image transmission throw multicarrier techniques, etc. This paper also includes acoustic propagation properties in seawater and underwater acoustic channel representation.
基金supported by National Natural Science Foundation of China under Grants No.61471322
文摘In the forthcoming 5G systems, new technologies, such as amorphous networks and non-orthogonal filter bank multicarriers(FBMC), provide an effective way to accommodate high-rate transmissions. Meanwhile, the prototype filter affects the adjacent channel interference, and therefore is important for FBMC systems. Besides, once the amorphous network is taken into account, the requirement for interference controlmust be much stricter. Accordingly, this paper focuses on the design of prototype filter with better ability of interference controlling, where we exploit the nonlinear phase FIR filter(NLPFF) instead of traditional linear phase FIR filter(LPFF) to achieve more optimization spaces under a small sacrifice of linear phase. In ourdesigns, both the amplitude and phase responsesare handled independently to approach the stopband performance enhancements, in while the nearly perfect reconstruction(NPR) conditionsare relaxed by pre-specified thresholds. Computer simulations confirm the effectiveness of the NLPFF designs, and demonstrate the advantages of the proposed NLPFF in FBMC applications.
文摘针对滤波器组多载波(Filter Bank Multicarrier,FBMC)系统的信道估计问题,对系统进行了简要介绍并提出一种基于线性最小均方误差(Liner Minimum Mean-Square Error,LMMSE)算法改进的信道估计算法。在原有的LMMSE算法基础上结合离散傅里叶变换(Discrete Fourier Transform,DFT)算法,并进行迭代估计,同时利用奇异值分解(Singular Value Decomposition,SVD)算法降低了计算的复杂度。仿真结果表明,改进的LMMSE算法明显提高了系统的性能。
基金supported by ZTE Industry-Academia-Research Cooperation Funds under Grant No.Surrey-Ref-9953
文摘Filter-bank multicarrier （FBMC） with offset quadrature amplitude modulation （OQAM） is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing （OFDM） systems. However, because of or-thogonality in real field and the presence of imaginary intrinsic interference, channel estimation in FBMC is not as straightforward as OFDM systems especially in multiple antenna scenarios. In this paper, we propose a channel estimation method which employs intrinsic interference cancellation at the transmitter side. The simulation results show that this method has less pilot overhead, less peak to average power ratio （PAPR）, better bit error rate （BER）, and better mean square error （MSE） performance compared to the well-known intrinsic approximation methods （IAM）.
文摘考虑到现实水声通信环境中存在非连续频带干扰导致系统的接收端误码率较高的问题,本文提出一种基于索引调制的FBMC水声抗干扰通信(filter bank multi-carrier with index modulation, FBMC-IM)技术研究方案。首先分析无干扰情况下,水声FBMC-IM通信系统误码率性能要优于传统FBMC系统。根据非连续频带干扰频率范围,对水声FBMC-IM系统的通信频带进行划分,使得与非连续频带干扰信号混叠部分的子载波静默,未受干扰的子载波保持活跃状态并承载通信信号,实现不连续的通信频带划分来规避干扰的影响。仿真实验结果表明,该方案明显降低了系统接收端的误码率,提高了系统的抗干扰能力。
文摘There are numerous goals in next-generation cellular networks(5G),which is expected to be available soon.They want to increase data rates,reduce end-to-end latencies,and improve end-user service quality.Modern networks need to change because there has been a significant rise in the number of base stations required to meet these needs and put the operators’low-cost constraints to the test.Because it can withstand interference from other wireless networks,and Adaptive Complex Multicarrier Modulation(ACMM)system is being looked at as a possible choice for the 5th Generation(5G)of wireless networks.Many arithmetic units need to be used on the hardware side of multicarrier systems to do the pulse-shaping filters and inverse FFT.The main goal of this study is to adapt complex multicarrier modulation(ACMM)for baseband transmission with low complexity and the ability to change it.We found that this is the first recon-figurable architecture that lets you choose how many subcarriers a subband has while still having the same amount of hardware resources as before.Also,under the new design with a single selection line,it selects from a set of filters.The baseband modulating signal is evaluated and tested using a Field-Programmable Gate Array(FPGA)device.This device is available from a commercial source.New technology outperforms current technology in terms of computational com-plexity,simple design,and ease of implementation.Additionally,it has a higher power spectrum density,spectral efficiency,a lower bit error rate,and a higher peak to average power ratio than existing technology.
