CAJ | 학술논문

在非协作通信中,发送端的符号率对于接收机是未知的,接收机必须从接收数据中估计出此参数.为了校正符号率的估计偏差,本文提出的适用于MPSK/MQAM的符号定时恢复环路,通过锁定检测来调整环路带宽可以快速捕获0.5%的符号率偏差,并确保环路有好的稳态性能.此外本文提出了一种新的符号率偏差辅助捕获方法--搜捕,可以捕获10%的符号率偏差,这一点在非协作通信中具有重要意义.而且仿真结果表明,在不同的符号率偏差下环路收敛后的稳态性能几乎一样,在相同的误比特率下实时的解调损失与理论值相比小于1dB.
재비협작통신중,발송단적부호솔대우접수궤시미지적,접수궤필수종접수수거중고계출차삼수.위료교정부호솔적고계편차,본문제출적괄용우MPSK/MQAM적부호정시회복배로,통과쇄정검측래조정배로대관가이쾌속포획0.5%적부호솔편차,병학보배로유호적은태성능.차외본문제출료일충신적부호솔편차보조포획방법--수포,가이포획10%적부호솔편차,저일점재비협작통신중구유중요의의.이차방진결과표명,재불동적부호솔편차하배로수렴후적은태성능궤호일양,재상동적오비특솔하실시적해조손실여이론치상비소우1dB.
In non-cooperative communication symbol rate of the transmitter is unknown, so the receiver has to estimate this pa-rameter blindly from the received data. To correct the estimation error of symbol rate offset ( SRO), the symbol timing recovery loop for MPSK/MQAM is proposed in this paper, which can capture 0.5% SRO and ensure good steady performance by adjusting loop band-width with the help of lock detector. Besides, this paper proposes a new SRO acquisition method--scanning and it can capture 10% SRO. This conclusion is very important in non-cooperative communication. Simulation results show that under different SRO the steady performance of the timing recovery loop is almost the same and the real-time demodulation loss compared to the theoretical value is less than 1dB.