针对PSK、QAM信号的理论识别算法在实际应用系统中不能满足较高的识别精度这一问题,提出一种基于星座图的PSK、QAM信号联合识别算法。该算法首先对信号同步处理并恢复信号星座图,然后进行相位统计与星座图聚类,提取出星座图的中心点个数...针对PSK、QAM信号的理论识别算法在实际应用系统中不能满足较高的识别精度这一问题,提出一种基于星座图的PSK、QAM信号联合识别算法。该算法首先对信号同步处理并恢复信号星座图,然后进行相位统计与星座图聚类,提取出星座图的中心点个数N、相位个数P以及最大半径与最小半径比R等特征参数,再构造评估函数C(N,R,P)以识别PSK、QAM信号的调制方式。实际应用表明,对码元数目大于800的PSK和QAM信号的识别准确率均高于94%;对信噪比为8.25 d B的860M数字集群TETRA信号的识别率高达94.12%。该算法流程清晰且不需要任何先验知识,非常适合实际应用,此方法已经在某公司的信号分析系统上得到了应用。展开更多
In commercial applications of phase Doppler anemometry (PDA), the effectiveness of non sphericity of particles is present and the response of PDA system deviates from the theoretical prediction. In this paper, the st...In commercial applications of phase Doppler anemometry (PDA), the effectiveness of non sphericity of particles is present and the response of PDA system deviates from the theoretical prediction. In this paper, the statistic characteristics of PDA signal related to irregular particles is analyzed and a method of statistic classification of irregular particles is proposed.It proves that the parameter of PDA signal for irregular particles is an unbiased estimation for spherical ones, the mean of the phase difference is in direct proportion to the mean diameter of particles and the standard deviation of the phase difference increases linearly with the standard deviation of irregular particles. As an application of the identification of irregular objects, fuzzy patterns and similarities of haemocytes are used to recognize and quantify cell samples.The statistic classification of particles is more significant in practice.展开更多
A joint direction of arrival (DOA) estimation and phase calibration for synchronous CDMA system with decorrelator are presented. Through decorrelating processing DOAs of the desired users can be estimated independentl...A joint direction of arrival (DOA) estimation and phase calibration for synchronous CDMA system with decorrelator are presented. Through decorrelating processing DOAs of the desired users can be estimated independently and all other resolved signal interferences are eliminated. Emphasis is directed to applications in which sensor phases may be in error. It is shown that accurate phase calibration in conjunction with their use in high resolution DOA estimation can be achieved for the decoupled signals.展开更多
针对非协作通信中的短时突发信号调制方式识别问题,提出了一种基于小波变换的信号相位差统计识别方法,实现了对二相相移键控(BPSK)、四相相移键控(QPSK)、八相相移键控(8PSK)这3种多进制相移键控(MPSK)信号的识别。该方法首先需要估计...针对非协作通信中的短时突发信号调制方式识别问题,提出了一种基于小波变换的信号相位差统计识别方法,实现了对二相相移键控(BPSK)、四相相移键控(QPSK)、八相相移键控(8PSK)这3种多进制相移键控(MPSK)信号的识别。该方法首先需要估计信号符号速率;然后对希尔比特变换后的待识别信号进行小波变换,提取信号瞬时相位信息并计算其相邻码元相位差序列;最后对相位差信息进行直方图统计,并通过改进的二值削波谱峰搜索算法对其进行峰值搜索,再通过峰值判断输入信号的类型。试验结果表明,在码元数目为150、信噪比大于1 d B时,3种信号调制方式的识别率平均可达96%以上。该算法计算量小,易于工程实现,具有良好的抗频偏性。改进的峰值搜索算法也适用于解决其他各种基于波峰搜索的问题。展开更多
The quantum Fourier transform and quantum phase estimation are the key components for many quantum algorithms, such as order-finding, factoring, and etc. In this article, the general procedure of quantum Fourier trans...The quantum Fourier transform and quantum phase estimation are the key components for many quantum algorithms, such as order-finding, factoring, and etc. In this article, the general procedure of quantum Fourier transform and phase estimation are investigated for high dimensional case run in a qudit quantum computer, and the quantum circuits are They can be seen as subroutines in a main program given.展开更多
In this paper, a multiple parameters weighted fractional Fourier transform(MPWFRFT) and constellation scrambling(CS) method based physical layer(PHY) security system is proposed. The proposed scheme is executed by two...In this paper, a multiple parameters weighted fractional Fourier transform(MPWFRFT) and constellation scrambling(CS) method based physical layer(PHY) security system is proposed. The proposed scheme is executed by two steps. In the first step, MPWFRFT, implemented as the constellation beguiling(CB) method, is applied to change the signal's identity. In the second step the additional pseudo random phase information, regarded as the encryption key, is attached to the original signal to enhance the security. Typically, the pseudo random phase information can be removed effectively by the legitimate receiver. In contrast to the cryptography based encryption algorithms and the conventional PHY secrecy techniques, the main contribution of the proposed scheme is concentrated on the variation in signal's characteristics. Simulation results show that the proposed scheme can prevent the exchanging signal from eavesdroppers' classifi cation or inception. Moreover, the proposed scheme can guarantee the BER performance at a tolerate increasing in computational complexity for the legitimate receivers.展开更多
A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west comp...A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west component of the tidal force and tidal body stress are chosen as the tidal curve in the daily scale. The results show that most of the earthquakes occurred near the maximum 0° of the three kinds of tidal curves,the predominant tidal phases of the earthquake are- 5. 86°,6. 60° and- 15. 52°,and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curves( the north-south,east-west component of the tidal force and tidal body stress),the p S of Schusters test for all the earthquakes is 10. 52%,2. 40% and 2. 06%,and the p P of the Permutation test is 10. 90%,2. 40% and 2. 06%,and the results of p S and p P based on the east-west component of the tidal force and tidal body stress are below the threshold of 0. 05 that tidal triggering of earthquakes. In the monthly scale,both the p S and p P are very low( close to 0),far below the threshold of 0. 05 of tidal triggering of earthquakes,and the predominant tidal phase for earthquake triggering is- 18. 95°,close to the maximum 0°( new moon and full moon) of the earth tide in monthly scale. Regarding the statistical test result of tidal triggering of earthquakes,a preliminary explanation is given as to why the trigger effect in the east-west direction is greater than that in north-south direction.展开更多
文摘针对PSK、QAM信号的理论识别算法在实际应用系统中不能满足较高的识别精度这一问题,提出一种基于星座图的PSK、QAM信号联合识别算法。该算法首先对信号同步处理并恢复信号星座图,然后进行相位统计与星座图聚类,提取出星座图的中心点个数N、相位个数P以及最大半径与最小半径比R等特征参数,再构造评估函数C(N,R,P)以识别PSK、QAM信号的调制方式。实际应用表明,对码元数目大于800的PSK和QAM信号的识别准确率均高于94%;对信噪比为8.25 d B的860M数字集群TETRA信号的识别率高达94.12%。该算法流程清晰且不需要任何先验知识,非常适合实际应用,此方法已经在某公司的信号分析系统上得到了应用。
文摘In commercial applications of phase Doppler anemometry (PDA), the effectiveness of non sphericity of particles is present and the response of PDA system deviates from the theoretical prediction. In this paper, the statistic characteristics of PDA signal related to irregular particles is analyzed and a method of statistic classification of irregular particles is proposed.It proves that the parameter of PDA signal for irregular particles is an unbiased estimation for spherical ones, the mean of the phase difference is in direct proportion to the mean diameter of particles and the standard deviation of the phase difference increases linearly with the standard deviation of irregular particles. As an application of the identification of irregular objects, fuzzy patterns and similarities of haemocytes are used to recognize and quantify cell samples.The statistic classification of particles is more significant in practice.
文摘A joint direction of arrival (DOA) estimation and phase calibration for synchronous CDMA system with decorrelator are presented. Through decorrelating processing DOAs of the desired users can be estimated independently and all other resolved signal interferences are eliminated. Emphasis is directed to applications in which sensor phases may be in error. It is shown that accurate phase calibration in conjunction with their use in high resolution DOA estimation can be achieved for the decoupled signals.
文摘针对非协作通信中的短时突发信号调制方式识别问题,提出了一种基于小波变换的信号相位差统计识别方法,实现了对二相相移键控(BPSK)、四相相移键控(QPSK)、八相相移键控(8PSK)这3种多进制相移键控(MPSK)信号的识别。该方法首先需要估计信号符号速率;然后对希尔比特变换后的待识别信号进行小波变换,提取信号瞬时相位信息并计算其相邻码元相位差序列;最后对相位差信息进行直方图统计,并通过改进的二值削波谱峰搜索算法对其进行峰值搜索,再通过峰值判断输入信号的类型。试验结果表明,在码元数目为150、信噪比大于1 d B时,3种信号调制方式的识别率平均可达96%以上。该算法计算量小,易于工程实现,具有良好的抗频偏性。改进的峰值搜索算法也适用于解决其他各种基于波峰搜索的问题。
基金Supported by the National Natural Science Foundation of China Grant No.10874098the National Basic Research Program of China under Grant Nos.2009CB929402 and 2011CB9216002
文摘The quantum Fourier transform and quantum phase estimation are the key components for many quantum algorithms, such as order-finding, factoring, and etc. In this article, the general procedure of quantum Fourier transform and phase estimation are investigated for high dimensional case run in a qudit quantum computer, and the quantum circuits are They can be seen as subroutines in a main program given.
基金supported by the National Basic Research Program of China under Grant 2013CB329003in part by the National Natural Science Foundation General Program of China under Grant 61171110
文摘In this paper, a multiple parameters weighted fractional Fourier transform(MPWFRFT) and constellation scrambling(CS) method based physical layer(PHY) security system is proposed. The proposed scheme is executed by two steps. In the first step, MPWFRFT, implemented as the constellation beguiling(CB) method, is applied to change the signal's identity. In the second step the additional pseudo random phase information, regarded as the encryption key, is attached to the original signal to enhance the security. Typically, the pseudo random phase information can be removed effectively by the legitimate receiver. In contrast to the cryptography based encryption algorithms and the conventional PHY secrecy techniques, the main contribution of the proposed scheme is concentrated on the variation in signal's characteristics. Simulation results show that the proposed scheme can prevent the exchanging signal from eavesdroppers' classifi cation or inception. Moreover, the proposed scheme can guarantee the BER performance at a tolerate increasing in computational complexity for the legitimate receivers.
基金sponsored by the Earthquake Situation Tracking Task of 2013(2013020119)the Fund of Earthquake Administration of Xinjiang Uygur Autonomous Region,China(201304)
文摘A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west component of the tidal force and tidal body stress are chosen as the tidal curve in the daily scale. The results show that most of the earthquakes occurred near the maximum 0° of the three kinds of tidal curves,the predominant tidal phases of the earthquake are- 5. 86°,6. 60° and- 15. 52°,and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curves( the north-south,east-west component of the tidal force and tidal body stress),the p S of Schusters test for all the earthquakes is 10. 52%,2. 40% and 2. 06%,and the p P of the Permutation test is 10. 90%,2. 40% and 2. 06%,and the results of p S and p P based on the east-west component of the tidal force and tidal body stress are below the threshold of 0. 05 that tidal triggering of earthquakes. In the monthly scale,both the p S and p P are very low( close to 0),far below the threshold of 0. 05 of tidal triggering of earthquakes,and the predominant tidal phase for earthquake triggering is- 18. 95°,close to the maximum 0°( new moon and full moon) of the earth tide in monthly scale. Regarding the statistical test result of tidal triggering of earthquakes,a preliminary explanation is given as to why the trigger effect in the east-west direction is greater than that in north-south direction.
