针对多径条件下,FBMC/OQAM系统采用分散式导频结构的信道估计算法存在导频功率开销过大的问题,提出一种基于双导频的功率优化信道估计算法(DDP with FFT)。在传统双导频信道估计(DDP)的基础上,主动引入相位模糊,降低传输导频对的功率消...针对多径条件下,FBMC/OQAM系统采用分散式导频结构的信道估计算法存在导频功率开销过大的问题,提出一种基于双导频的功率优化信道估计算法(DDP with FFT)。在传统双导频信道估计(DDP)的基础上,主动引入相位模糊,降低传输导频对的功率消耗,利用多径信道能量集中的特点,对引入的相位模糊进行估计,进一步保证信道估计准确度。理论分析和仿真结果表明,提出的优化算法可以有效降低导频功率开销,实现高精度信道估计性能。展开更多
色散选择性映射(dispersive selected mapping,DSLM)是降低基于偏移正交幅度调制的滤波器组多载波(filter bank multicarrier with offset quadrature amplitude modulation,FBMC/OQAM)系统峰均比(peak to average power ratio,PAPR)的...色散选择性映射(dispersive selected mapping,DSLM)是降低基于偏移正交幅度调制的滤波器组多载波(filter bank multicarrier with offset quadrature amplitude modulation,FBMC/OQAM)系统峰均比(peak to average power ratio,PAPR)的技术,但是该方法需要传输额外比特边带信息(side information,SI)。为了抑制FBMC/OQAM系统的PAPR,提高系统的频谱利用率,在DSLM的基础上,提出了一种无边带信息的色散选择性映射(without side information of DSLM,W-DSLM)方法。W-DSLM通过在相位序列中挑选特定的位置,并插入模值大于1的扩展因子对相位序列进行改进,然后利用扩展因子与相邻位置的能量差,在接收端得到最优相位序列,从而恢复出传输的符号。扩展因子的插入避免了边带信息的传输,因此能够有效提高系统的频谱效率。仿真结果验证了该方法的有效性。展开更多
部分传输序列(Partial Transmit Sequence,PTS)是降低正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均比(Peak-to-Average Power Ratio,PAPR)的有效方法,但是PTS穷举法搜索最优解,使系统复杂度增加。针对这一...部分传输序列(Partial Transmit Sequence,PTS)是降低正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均比(Peak-to-Average Power Ratio,PAPR)的有效方法,但是PTS穷举法搜索最优解,使系统复杂度增加。针对这一缺点进行改进,提出了基于离散粒子群优化的部分传输序列(Partial Transmit Sequence based on Discrete Particle Swarm Optimization,PTS-DPSO)方法,并将其应用到基于偏移正交幅度调制的滤波器组多载波系统(Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation,FBMC/OQAM)中。PTS-DPSO利用离散粒子群优化搜寻最优解,避免了系统复杂度的增加。通过仿真验证,PTS-DPSO可以有效抑制FBMC/OQAM系统过高的PAPR且误码率低。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
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
水下环境的复杂性对水声通信带来挑战,一般通过优化信道估计技术来实现水下通信的高速率、可靠性传输。将滤波器组多载波/交错正交幅度调制(filter bank based multicarrier/offset quadrature amplitude modulation, FBMC/OQAM)技术引...水下环境的复杂性对水声通信带来挑战,一般通过优化信道估计技术来实现水下通信的高速率、可靠性传输。将滤波器组多载波/交错正交幅度调制(filter bank based multicarrier/offset quadrature amplitude modulation, FBMC/OQAM)技术引入水下,研究FBMC/OQAM系统中信道估计技术,并对离散导频信道估计算法进行重点研究。分析了不同信道影响下离散导频信道估计的性能,并针对辅助导频法额外功率消耗过高的问题进行改进,提出一种改进的辅助导频方法(improved auxiliary pilot method, IAP),降低功率消耗的同时又提高了估计性能。理论分析和水下仿真结果表明,IAP算法是水声通信实际应用中较好的选择。展开更多
为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进...为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进行改进并引入到FBMC系统中。利用共轭对称结构能够提高定时精度和加权处理能够更好地抵抗频偏影响的特点设计同步序列,进行共轭对称和加权处理。仿真结果表明,基于改进序列的Park算法相较共轭对称序列的TR1算法,其信噪比提前3 dB达到了100%定时准确率,实现了低信噪比下的高精度定时同步,且具有更强的抗频偏性能;相较原Park算法,相同信噪比下,改进序列的Park算法的频偏均方差(Mean Square Error,MSE)也小于原Park算法的频偏MSE,抗频偏性能表现更优。展开更多
The multicarrier transmission techniques have been the most beguiling one for the development of wireless communication systems like 4G, Long Term evolution and now the successor 5G. For 5G or fifth generation wireles...The multicarrier transmission techniques have been the most beguiling one for the development of wireless communication systems like 4G, Long Term evolution and now the successor 5G. For 5G or fifth generation wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank Multi carrier modulation (FBMC) are the dominant waveform contenders. In this research paper, the disadvantages of OFDM have been addressed and it has shown that filter bank multicarrier (FBMC) could be a more effective solution. The comparative analysis of FBMC and OFDM has been performed based on Power Spectral Densities, sub channels, computational complexity and prototype filter comparison simulated using MATLAB.展开更多
A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power...A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power ratio(PAPR) of filter bank multicarrier-offset quadrature amplitude modulation(FBMC-OQAM) signals.The V subblocks in partial transmit sequence(PTS) are regrouped into U combinations according to the correlation coefficient p,and overlapping subblocks are allowed between adjacent groups.The search starts from the first group and sets the phase factors of the subsequent groups to 1.When the phase factors of the non-overlapping subblocks in the first group are determined,the subsequent groups are searched in turn to determine their respective phase factors.Starting from the second data block,the data overlapped with it should be taken into account when determining its optimal phase factor vector.Theoretical analysis and simulation results indicate that compared with the OPTS algorithm,the proposed algorithm can significantly reduce the computational complexity at the cost of slight deterioration of PAPR performance.Meanwhile,compared with the even-odd iterative double-layers OPTS(ID-OPTS) algorithm,it can further reduce the complexity and obtain a better PAPR suppression effect.展开更多
文摘针对多径条件下,FBMC/OQAM系统采用分散式导频结构的信道估计算法存在导频功率开销过大的问题,提出一种基于双导频的功率优化信道估计算法(DDP with FFT)。在传统双导频信道估计(DDP)的基础上,主动引入相位模糊,降低传输导频对的功率消耗,利用多径信道能量集中的特点,对引入的相位模糊进行估计,进一步保证信道估计准确度。理论分析和仿真结果表明,提出的优化算法可以有效降低导频功率开销,实现高精度信道估计性能。
文摘色散选择性映射(dispersive selected mapping,DSLM)是降低基于偏移正交幅度调制的滤波器组多载波(filter bank multicarrier with offset quadrature amplitude modulation,FBMC/OQAM)系统峰均比(peak to average power ratio,PAPR)的技术,但是该方法需要传输额外比特边带信息(side information,SI)。为了抑制FBMC/OQAM系统的PAPR,提高系统的频谱利用率,在DSLM的基础上,提出了一种无边带信息的色散选择性映射(without side information of DSLM,W-DSLM)方法。W-DSLM通过在相位序列中挑选特定的位置,并插入模值大于1的扩展因子对相位序列进行改进,然后利用扩展因子与相邻位置的能量差,在接收端得到最优相位序列,从而恢复出传输的符号。扩展因子的插入避免了边带信息的传输,因此能够有效提高系统的频谱效率。仿真结果验证了该方法的有效性。
文摘部分传输序列(Partial Transmit Sequence,PTS)是降低正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均比(Peak-to-Average Power Ratio,PAPR)的有效方法,但是PTS穷举法搜索最优解,使系统复杂度增加。针对这一缺点进行改进,提出了基于离散粒子群优化的部分传输序列(Partial Transmit Sequence based on Discrete Particle Swarm Optimization,PTS-DPSO)方法,并将其应用到基于偏移正交幅度调制的滤波器组多载波系统(Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation,FBMC/OQAM)中。PTS-DPSO利用离散粒子群优化搜寻最优解,避免了系统复杂度的增加。通过仿真验证,PTS-DPSO可以有效抑制FBMC/OQAM系统过高的PAPR且误码率低。
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 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）.
文摘水下环境的复杂性对水声通信带来挑战,一般通过优化信道估计技术来实现水下通信的高速率、可靠性传输。将滤波器组多载波/交错正交幅度调制(filter bank based multicarrier/offset quadrature amplitude modulation, FBMC/OQAM)技术引入水下,研究FBMC/OQAM系统中信道估计技术,并对离散导频信道估计算法进行重点研究。分析了不同信道影响下离散导频信道估计的性能,并针对辅助导频法额外功率消耗过高的问题进行改进,提出一种改进的辅助导频方法(improved auxiliary pilot method, IAP),降低功率消耗的同时又提高了估计性能。理论分析和水下仿真结果表明,IAP算法是水声通信实际应用中较好的选择。
文摘为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进行改进并引入到FBMC系统中。利用共轭对称结构能够提高定时精度和加权处理能够更好地抵抗频偏影响的特点设计同步序列,进行共轭对称和加权处理。仿真结果表明,基于改进序列的Park算法相较共轭对称序列的TR1算法,其信噪比提前3 dB达到了100%定时准确率,实现了低信噪比下的高精度定时同步,且具有更强的抗频偏性能;相较原Park算法,相同信噪比下,改进序列的Park算法的频偏均方差(Mean Square Error,MSE)也小于原Park算法的频偏MSE,抗频偏性能表现更优。
文摘The multicarrier transmission techniques have been the most beguiling one for the development of wireless communication systems like 4G, Long Term evolution and now the successor 5G. For 5G or fifth generation wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank Multi carrier modulation (FBMC) are the dominant waveform contenders. In this research paper, the disadvantages of OFDM have been addressed and it has shown that filter bank multicarrier (FBMC) could be a more effective solution. The comparative analysis of FBMC and OFDM has been performed based on Power Spectral Densities, sub channels, computational complexity and prototype filter comparison simulated using MATLAB.
基金Supported by the National Natural Science Foundation of China(No.61601296,61701295,61801286)the Major Scientific and Technological Innovation Projects in Chengdu(No.2019-YF08-00082-GX)the Talent Program of Shanghai University of Engineering Science(No.2018RC43)。
文摘A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power ratio(PAPR) of filter bank multicarrier-offset quadrature amplitude modulation(FBMC-OQAM) signals.The V subblocks in partial transmit sequence(PTS) are regrouped into U combinations according to the correlation coefficient p,and overlapping subblocks are allowed between adjacent groups.The search starts from the first group and sets the phase factors of the subsequent groups to 1.When the phase factors of the non-overlapping subblocks in the first group are determined,the subsequent groups are searched in turn to determine their respective phase factors.Starting from the second data block,the data overlapped with it should be taken into account when determining its optimal phase factor vector.Theoretical analysis and simulation results indicate that compared with the OPTS algorithm,the proposed algorithm can significantly reduce the computational complexity at the cost of slight deterioration of PAPR performance.Meanwhile,compared with the even-odd iterative double-layers OPTS(ID-OPTS) algorithm,it can further reduce the complexity and obtain a better PAPR suppression effect.
