摘要
基于多相滤波和调制滤波器组的数字信道化技术是实现星上柔性转发的主要方法。由于调制滤波器组使用的原型滤波器不是理想滤波器,不同用户信号间存在功率泄漏,同时柔性转发器对信号进行处理时还会使信号产生微小失真,这些最终都会表现为系统信噪比的损失或误码率的增大。为了研究功率泄露和信号失真对系统性能的影响,分析柔性转发器中调制滤波器组的性能特性,将滤波器组的设计转换为原型滤波器的设计,再针对不同用户带宽下系统的误码率性能进行仿真,最终确定在原型滤波器固定后影响系统性能的主要原因为用户信号的带宽大小。
Digital channelization based on polyphase filtering and modulated filter banks is the main method to realizesatellite flexible transponder.As the prototype filter is not an ideal filter,there will be power leakageamong different signals and slight distortions when the signalsare processed by the flexible transponder,which willfinally causea loss of SNR or an increase of BER.In order to study the influence of power leakage and signal distortion on system performance,the paper analyzes the performance of the modulated filter banks in flexible transponder,which results in the replacement of the filter banks design by a prototype filter design.Then simulations of BER with different user bandwidths are performed,and it is concluded that the main factors affecting system performanceareuser band.widths when the prototype filter is determined.
出处
《无线电工程》
2015年第1期36-39,共4页
Radio Engineering
基金
国家部委基金资助项目
关键词
柔性转发
数字信道化
调制滤波器组
功率泄露
信号失真
flexible transponder
digital channelization
modulated filter banks
power leakage
signal distortion
