摘要
载波恢复技术通常是采用锁相环(PLL)和其他辅助手段提取载波,但锁相环的频率捕获范围受信噪比的制约,低信噪比下捕获范围小且容易失锁。对于散射信道,锁相环机制往往难以奏效。针对此问题,提出了一种新的载波频差估计和矫正方法,并借助Matlab工具对该算法的抗噪声性能进行了仿真,采用Altera公司的EP1C20F324I7硬件实现了该频差估计和矫正算法,测试结果满足散射通信系统要求,可考虑应用于工程中。
Usually,phased lock loop（ i. e. PLL） and other auxiliary methods are adopted in carrier recovery technology, but its fre- quency tracking range is seriously restricted,which means it could be easily out of lock. Therefore,PLL is usually not effective for low bit rate troposphere scatter communication. In order to solve the above problem, a estimation about carrier frequency error based on CORDIC algorithm and rectifying algorithm are presented,whose anti-noise performance is simulated completely with Matlab. The fre- quency error estimation and rectifying algorithm is implemented in Altera EP1C20F32417,and the test results are presented.
出处
《无线电工程》
2012年第8期43-45,共3页
Radio Engineering
关键词
低速率散射通信
线性调频调制
CORDIC算法
频率校准
troposcatter communication of low symbol-rate
the modem for chirp signal
CORDIC algorithm
frequency calibration
