电子测试
電子測試
전자측시
ELECTRONIC TEST
2012年
11期
5-10
,共6页
载波恢复%极性判决算法%高阶QAM%FPGA
載波恢複%極性判決算法%高階QAM%FPGA
재파회복%겁성판결산법%고계QAM%FPGA
carrier recovery%polarity decision algorithm%high order QAM%FPGA
本文介绍了适用于高阶QAM载波恢复的极性判决算法。该算法利用极性判决器捕获大概频偏,再利用DD算法跟踪并进一步纠正频偏,减小抖动误差,从而相较传统算法具有更好的频偏捕获能力和健壮性。同时,该算法能对两种算法模式进行自动切换以达到精确的频偏纠正目的。本文采用实用有效的MSE方法对这两种算法模式进行自动转换控制,并以128QAM为例对该算法进行MATLAB仿真分析。最后在FPGA平台上实现了128QAM的载波恢复算法,并且效果理想,有很好的移植性。
本文介紹瞭適用于高階QAM載波恢複的極性判決算法。該算法利用極性判決器捕穫大概頻偏,再利用DD算法跟蹤併進一步糾正頻偏,減小抖動誤差,從而相較傳統算法具有更好的頻偏捕穫能力和健壯性。同時,該算法能對兩種算法模式進行自動切換以達到精確的頻偏糾正目的。本文採用實用有效的MSE方法對這兩種算法模式進行自動轉換控製,併以128QAM為例對該算法進行MATLAB倣真分析。最後在FPGA平檯上實現瞭128QAM的載波恢複算法,併且效果理想,有很好的移植性。
본문개소료괄용우고계QAM재파회복적겁성판결산법。해산법이용겁성판결기포획대개빈편,재이용DD산법근종병진일보규정빈편,감소두동오차,종이상교전통산법구유경호적빈편포획능력화건장성。동시,해산법능대량충산법모식진행자동절환이체도정학적빈편규정목적。본문채용실용유효적MSE방법대저량충산법모식진행자동전환공제,병이128QAM위례대해산법진행MATLAB방진분석。최후재FPGA평태상실현료128QAM적재파회복산법,병차효과이상,유흔호적이식성。
A polarity decision algorithm suitable for high order QAM carrier recovery is introduced in this paper. It use the polarity decision to capture the rough frequency offset, and then correct the frequency offset more accurately. So the algorithm is more capable in frequency offset capturing and more stable compared with traditional algorithms. Meanwhile, this algorithm can automatically converting the two different algorithm modes. In this paper, the way used to control the converting between the two different modes is MSE. And the simulation in MATLAB about the algorithm is analyzed, using 128QAM for instance. At the last, the whole algorithm is implemented on the platform of FPGA, with desired results and is also portable.
