Based on a dual-polarization high-frequency wave radar system, an adaptive system using horizontal antennas for the suppression of the Es layer interference （ELI） is deseribech The data received from the horizontal ...Based on a dual-polarization high-frequency wave radar system, an adaptive system using horizontal antennas for the suppression of the Es layer interference （ELI） is deseribech The data received from the horizontal antennas were correlated with the data received from the Vertically Polarized Antennas （VPAs） to estimate and cancel the interference adaptively in the VPAs. Suppressing the interference after each coherent integration time interval, about 25 dB signal-to-interference ratio is expected with the experimentally derived data.展开更多
A multiple frequency cancellation(MFC)method is proposed for stealth design of ultra-wide band(UWB)end-fire antenna array.The proposed method can produce significant radar cross section(RCS)reduction in the whole oper...A multiple frequency cancellation(MFC)method is proposed for stealth design of ultra-wide band(UWB)end-fire antenna array.The proposed method can produce significant radar cross section(RCS)reduction in the whole operating band.The 1×4 and 4×4 Vivaldi antenna arrays of different kinds of cancellation structures are discussed as examples to validate the effectiveness of the MFC method on both linear and planar arrays.On average,22.6 dB reduction of monostatic radar cross section(MRCS)is obtained in the whole X-band.MRCS under oblique incident waves is also reduced within±60°.Basically favorable radiation characteristics are maintained.展开更多
The adaptive array antenna may be considered as a general sidelobe canceller. Directional interference suppression is based on a recursive state estimation of Kalman filter. For the stationary filter,this leads to an...The adaptive array antenna may be considered as a general sidelobe canceller. Directional interference suppression is based on a recursive state estimation of Kalman filter. For the stationary filter,this leads to an iterative solution of Wiener Hops matrix equation. The performance of sidelobe canceller are studied by computer simulation. The result of simulation shows that the sidelobe canceller may be regarded as a special case of an adaptive array atenna.展开更多
Multiple Access Interference(MAI) is the major factor that degrades the performance of a CDMA system. In this paper, a novel transform domain algorithm combined with parameter estimation for MAI suppression is propose...Multiple Access Interference(MAI) is the major factor that degrades the performance of a CDMA system. In this paper, a novel transform domain algorithm combined with parameter estimation for MAI suppression is proposed. Compared with the method that combines an adaptive array antenna with parameter estimation for interference suppression, it converges faster with the same Bit Error Rate(BER) performance.展开更多
由于无线全双工系统中存在严重的自干扰问题,天线消除技术能够从模拟域的角度消除部分线性自干扰,考虑发射机功率放大器(power amplifier,PA)产生的非线性影响,提出一种基于天线消除的非线性数字自干扰消除方案。将PA和非线性自干扰信...由于无线全双工系统中存在严重的自干扰问题,天线消除技术能够从模拟域的角度消除部分线性自干扰,考虑发射机功率放大器(power amplifier,PA)产生的非线性影响,提出一种基于天线消除的非线性数字自干扰消除方案。将PA和非线性自干扰信道均描述为并行哈默斯坦(parallel Hammerstein,PH),通过估计模型系数和重建干扰对消信号,在数字域消除残留干扰。仿真结果表明,该方案与线性数字自干扰消除相比能实现更多的消除数量,运用同一种非线性数字消除技术,带有天线消除的全双工系统与无天线消除相比能够实现更高的信干噪比(signal to interference plus noise ratio,SINR)。展开更多
文摘Based on a dual-polarization high-frequency wave radar system, an adaptive system using horizontal antennas for the suppression of the Es layer interference （ELI） is deseribech The data received from the horizontal antennas were correlated with the data received from the Vertically Polarized Antennas （VPAs） to estimate and cancel the interference adaptively in the VPAs. Suppressing the interference after each coherent integration time interval, about 25 dB signal-to-interference ratio is expected with the experimentally derived data.
基金supported in part by Nanjing University of Aeronautics and Astronautics Research Funding(No. Kfjj20150414)。
文摘A multiple frequency cancellation(MFC)method is proposed for stealth design of ultra-wide band(UWB)end-fire antenna array.The proposed method can produce significant radar cross section(RCS)reduction in the whole operating band.The 1×4 and 4×4 Vivaldi antenna arrays of different kinds of cancellation structures are discussed as examples to validate the effectiveness of the MFC method on both linear and planar arrays.On average,22.6 dB reduction of monostatic radar cross section(MRCS)is obtained in the whole X-band.MRCS under oblique incident waves is also reduced within±60°.Basically favorable radiation characteristics are maintained.
文摘The adaptive array antenna may be considered as a general sidelobe canceller. Directional interference suppression is based on a recursive state estimation of Kalman filter. For the stationary filter,this leads to an iterative solution of Wiener Hops matrix equation. The performance of sidelobe canceller are studied by computer simulation. The result of simulation shows that the sidelobe canceller may be regarded as a special case of an adaptive array atenna.
文摘Multiple Access Interference(MAI) is the major factor that degrades the performance of a CDMA system. In this paper, a novel transform domain algorithm combined with parameter estimation for MAI suppression is proposed. Compared with the method that combines an adaptive array antenna with parameter estimation for interference suppression, it converges faster with the same Bit Error Rate(BER) performance.
文摘由于无线全双工系统中存在严重的自干扰问题,天线消除技术能够从模拟域的角度消除部分线性自干扰,考虑发射机功率放大器(power amplifier,PA)产生的非线性影响,提出一种基于天线消除的非线性数字自干扰消除方案。将PA和非线性自干扰信道均描述为并行哈默斯坦(parallel Hammerstein,PH),通过估计模型系数和重建干扰对消信号,在数字域消除残留干扰。仿真结果表明,该方案与线性数字自干扰消除相比能实现更多的消除数量,运用同一种非线性数字消除技术,带有天线消除的全双工系统与无天线消除相比能够实现更高的信干噪比(signal to interference plus noise ratio,SINR)。
