在美国电信科学协会(institute for telecommunication sciences,ITS)模型的基础上设计了一款易于仿真实现的宽带短波信道模拟器。通过分析其信道散射函数,验证了宽带短波信道模拟器模拟实际短波信道的有效性。采用该宽带短波信道模拟...在美国电信科学协会(institute for telecommunication sciences,ITS)模型的基础上设计了一款易于仿真实现的宽带短波信道模拟器。通过分析其信道散射函数,验证了宽带短波信道模拟器模拟实际短波信道的有效性。采用该宽带短波信道模拟器仿真测试了24 kHz信道带宽下的单载波频域均衡(single carrier modulation system withfrequency domain equalization,SC-FDE)数据传输系统的性能,说明了宽带短波信道模拟器的实际工作能力,并通过与Watterson信道模拟器的测试结果对比,证明了该宽带短波信道模拟器能更准确地测试短波宽带高速数据传输系统的性能。展开更多
The detection performance is evaluated for our proposed analog multiuser receiver in Ultra-WideBand (UWB) transmitted-reference system. In the presence of dense multipath and multi-access signals,the performance analy...The detection performance is evaluated for our proposed analog multiuser receiver in Ultra-WideBand (UWB) transmitted-reference system. In the presence of dense multipath and multi-access signals,the performance analysis is difficult due to the complicated waveform of received impulse. We develop an approach to analyze the steady-state Signal-to-Interference-plus-Noise (SINR) of the detector output. The multipath-spread impulse is fitted to an exponentially decaying profile in the analysis. A closed-form expression of steady-state SINR is further deduced for the proposed Least Minimum Square (LMS) detector. The analysis is validated by simulations in Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) channel respectively. Based on the theoretical results,the multipath delay spread is employed to determine the optimal width of the integration window of the detector.展开更多
文摘雷达信号模拟技术在现代雷达系统中有着重要的应用。随着半导体技术的迅猛发展,FPGA器件的工作频率和接口带宽越来越高,这使得利用高性能FPGA配合超高速DAC器件直接产生宽带雷达信号成为可能。该文介绍了一种基于X ilinx公司最新一代的V irtex-4系列超大规模FPGA芯片的雷达信号模拟系统,该系统最高转换速率可以达到1Gs/s,分辨率为14 b it。
基金Supported by the Guangxi Natural Science Foundation (No.0731025, No.0731026)the Established Project by Guangxi Education Department (No.200808LX117)
文摘The detection performance is evaluated for our proposed analog multiuser receiver in Ultra-WideBand (UWB) transmitted-reference system. In the presence of dense multipath and multi-access signals,the performance analysis is difficult due to the complicated waveform of received impulse. We develop an approach to analyze the steady-state Signal-to-Interference-plus-Noise (SINR) of the detector output. The multipath-spread impulse is fitted to an exponentially decaying profile in the analysis. A closed-form expression of steady-state SINR is further deduced for the proposed Least Minimum Square (LMS) detector. The analysis is validated by simulations in Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) channel respectively. Based on the theoretical results,the multipath delay spread is employed to determine the optimal width of the integration window of the detector.
