A modified RAKE receiver based on novel Recursive Least Squares （RLS） adaptive algorithm is proposed. The receiver uses L-fingered correlators, which are composed of RLS adaptive filters, to enhance the performance ...A modified RAKE receiver based on novel Recursive Least Squares （RLS） adaptive algorithm is proposed. The receiver uses L-fingered correlators, which are composed of RLS adaptive filters, to enhance the performance of multipath receiving. It can also track the amplitude of the received signal to form a real-time amplitude estimation which is correlated with the power of excess delay bin. The simulation results based on the IEEE UltraWide Band （UWB） channel models （CMI to CM4） show that the novel RLS algorithm can alter the attenuation estimation with the finger＇s power delay profile, and RAKE receiver with few fingers can be employed to get high performance.展开更多
An all-optical ultrawide band （UWB） doublet pulse train signal generator is proposed and theoretically simulated by utilizing an inverse wavelength conversion base on the cross-gain modulation （XGM） effect in a se...An all-optical ultrawide band （UWB） doublet pulse train signal generator is proposed and theoretically simulated by utilizing an inverse wavelength conversion base on the cross-gain modulation （XGM） effect in a semiconductor optical amplifier （SOA） and controllable time delay in two optical delay lines （ODLs）. The proposed scheme is not only optically switchable in the polarity of pulse by switching the polarity of input pulse but also tunable in signal pulse width and radiofrequency （RF） spectrum by tuning the ODLs.展开更多
基金Supported by the Chinese 863 National High Technology Program (No.2002AA783043)the National Natural Science Foundation of China (No.60390540).
文摘A modified RAKE receiver based on novel Recursive Least Squares （RLS） adaptive algorithm is proposed. The receiver uses L-fingered correlators, which are composed of RLS adaptive filters, to enhance the performance of multipath receiving. It can also track the amplitude of the received signal to form a real-time amplitude estimation which is correlated with the power of excess delay bin. The simulation results based on the IEEE UltraWide Band （UWB） channel models （CMI to CM4） show that the novel RLS algorithm can alter the attenuation estimation with the finger＇s power delay profile, and RAKE receiver with few fingers can be employed to get high performance.
基金This work was supported by the National Natural Science Foundation of China （Grant Nos. 61501088, 61307088, 61505020, and 61675040）, the Joint Funds of the National Natural Science Foundation of China （Grant No. U1633129）, the Science and Technology Planning Project of Sichuan Province （No. MZ2016036）, and the Fundamental Research Funds for the Central Universities （Nos. ZYGX2016J003, ZYGX2016J005, and ZYGX2016J009）.
文摘An all-optical ultrawide band （UWB） doublet pulse train signal generator is proposed and theoretically simulated by utilizing an inverse wavelength conversion base on the cross-gain modulation （XGM） effect in a semiconductor optical amplifier （SOA） and controllable time delay in two optical delay lines （ODLs）. The proposed scheme is not only optically switchable in the polarity of pulse by switching the polarity of input pulse but also tunable in signal pulse width and radiofrequency （RF） spectrum by tuning the ODLs.
