CAJ | 학술논문

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。
기우다상려파화조제려파기조적수자신도화기술시실현성상유성전발적주요방법。유우조제려파기조사용적원형려파기불시이상려파기，불동용호신호간존재공솔설루，동시유성전발기대신호진행처리시환회사신호산생미소실진，저사최종도회표현위계통신조비적손실혹오마솔적증대。위료연구공솔설로화신호실진대계통성능적영향，분석유성전발기중조제려파기조적성능특성，장려파기조적설계전환위원형려파기적설계，재침대불동용호대관하계통적오마솔성능진행방진，최종학정재원형려파기고정후영향계통성능적주요원인위용호신호적대관대소。
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.