在对传统LTE-OFDM深入研究的基础上,针对滤波OFDM(F-OFDM)技术特点,设计了数据帧格式,建立F-OFDM基带系统模型,通过对2个子带进行滤波处理,实现了各个子带波形的解耦,并仿真验证其性能。仿真结果表明:在AWGN信道下,F-OFDM系统的下行基...在对传统LTE-OFDM深入研究的基础上,针对滤波OFDM(F-OFDM)技术特点,设计了数据帧格式,建立F-OFDM基带系统模型,通过对2个子带进行滤波处理,实现了各个子带波形的解耦,并仿真验证其性能。仿真结果表明:在AWGN信道下,F-OFDM系统的下行基带信号的带外衰减超过60 d B,较LTE-OFDM高28 d B,F-OFDM与LTE-OFDM的BER接近一致,与理论值的差异小于1 d B。相比LTE-OFDM系统,F-OFDM系统在保证误码率性能的前提下,大大改善了带外频谱泄漏,并进一步提高了频谱效率。展开更多
A schematic to make the spectra of the exterior noise of high speed railway was put forward. The exterior noise spectrum was defined based on the characteristics of the high-speed train exterior noise. Its characteris...A schematic to make the spectra of the exterior noise of high speed railway was put forward. The exterior noise spectrum was defined based on the characteristics of the high-speed train exterior noise. Its characteristics considered here include identifying the exterior main sources and their locations, their frequency components including the Doppler effect due to the noise sources moving at high speed, the sound field intensity around the train in high-speed operation, the sound radiation path out of the train, and the pressure level and frequency components of the noise at the measuring points specified by the International Organization for Standardization(ISO). The characteristics of the high-speed train exterior noise of the high speed railways in operation were introduced. The advanced measuring systems and their principles for clearly indentifying the exterior noise sources were discussed in detail. Based on the concerned noise results measured at sites, a prediction model was developed to calculate the sound level and the characteristics of the exterior noise at any point where it is difficult to measure and to help to make the exterior noise spectrums. This model was also verified with the test results. The verification shows that there is a good agreement between the theoretical and experimental results.展开更多
文摘在对传统LTE-OFDM深入研究的基础上,针对滤波OFDM(F-OFDM)技术特点,设计了数据帧格式,建立F-OFDM基带系统模型,通过对2个子带进行滤波处理,实现了各个子带波形的解耦,并仿真验证其性能。仿真结果表明:在AWGN信道下,F-OFDM系统的下行基带信号的带外衰减超过60 d B,较LTE-OFDM高28 d B,F-OFDM与LTE-OFDM的BER接近一致,与理论值的差异小于1 d B。相比LTE-OFDM系统,F-OFDM系统在保证误码率性能的前提下,大大改善了带外频谱泄漏,并进一步提高了频谱效率。
基金Project(2682013BR009)supported by the Fundamental Research Funds of the Central Universities,ChinaProject(2011AA11A103-2-2)the National High-Technology Research and Development Program of China
文摘A schematic to make the spectra of the exterior noise of high speed railway was put forward. The exterior noise spectrum was defined based on the characteristics of the high-speed train exterior noise. Its characteristics considered here include identifying the exterior main sources and their locations, their frequency components including the Doppler effect due to the noise sources moving at high speed, the sound field intensity around the train in high-speed operation, the sound radiation path out of the train, and the pressure level and frequency components of the noise at the measuring points specified by the International Organization for Standardization(ISO). The characteristics of the high-speed train exterior noise of the high speed railways in operation were introduced. The advanced measuring systems and their principles for clearly indentifying the exterior noise sources were discussed in detail. Based on the concerned noise results measured at sites, a prediction model was developed to calculate the sound level and the characteristics of the exterior noise at any point where it is difficult to measure and to help to make the exterior noise spectrums. This model was also verified with the test results. The verification shows that there is a good agreement between the theoretical and experimental results.
