无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2012年
8期
43-45
,共3页
低速率散射通信%线性调频调制%CORDIC算法%频率校准
低速率散射通信%線性調頻調製%CORDIC算法%頻率校準
저속솔산사통신%선성조빈조제%CORDIC산법%빈솔교준
troposcatter communication of low symbol-rate%the modem for chirp signal%CORDIC algorithm%frequency calibration
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EPlC20F32417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。
載波恢複技術通常是採用鎖相環(PLL)和其他輔助手段提取載波,但鎖相環的頻率捕穫範圍受信譟比的製約,低信譟比下捕穫範圍小且容易失鎖。對于散射信道,鎖相環機製往往難以奏效。針對此問題,提齣瞭一種新的載波頻差估計和矯正方法,併藉助Matlab工具對該算法的抗譟聲性能進行瞭倣真,採用Altera公司的EPlC20F32417硬件實現瞭該頻差估計和矯正算法,測試結果滿足散射通信繫統要求,可攷慮應用于工程中。
재파회복기술통상시채용쇄상배(PLL)화기타보조수단제취재파,단쇄상배적빈솔포획범위수신조비적제약,저신조비하포획범위소차용역실쇄。대우산사신도,쇄상배궤제왕왕난이주효。침대차문제,제출료일충신적재파빈차고계화교정방법,병차조Matlab공구대해산법적항조성성능진행료방진,채용Altera공사적EPlC20F32417경건실현료해빈차고계화교정산법,측시결과만족산사통신계통요구,가고필응용우공정중。
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.