A Quick and Accurate Union Carrier Parameter Estimation Algorithm Based on FFT

GONG Chao; ZHANG Bang-ning; GUO Dao-xing

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A Quick and Accurate Union Carrier Parameter Estimation Algorithm Based on FFT

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- A Quick and Accurate Union Carrier Parameter Estimation Algorithm Based on FFT
- Acta Electronica Sinica Vol. 38, Issue 4, Pages: 766-0770(2010)
- 作者机构：
  
  （解放军理工大学通信工程学院，）,江苏,南京,210007
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- Published：2010
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GONG Chao, ZHANG Bang-ning, GUO Dao-xing. A Quick and Accurate Union Carrier Parameter Estimation Algorithm Based on FFT[J]. Acta Electronica Sinica, 2010, 38(4): 766-0770.
DOI：

GONG Chao, ZHANG Bang-ning, GUO Dao-xing. A Quick and Accurate Union Carrier Parameter Estimation Algorithm Based on FFT[J]. Acta Electronica Sinica, 2010, 38(4): 766-0770. DOI：

摘要

<FONT face=Verdana>针对数据辅助的突发信号载波同步，提出了一种基于FFT的载波参数联合估计新算法.其基本思想是在利用周期图峰值进行粗估的基础上，根据提出的新的插值公式，利用峰值左右两条谱线的幅度进行细估.仿真结果表明该算法的性能非常接近修正克拉美劳界（MCRB），而且工作门限很低，用64个符号进行估计时能在-4dB信噪比条件下正确估计出载波参数.频偏估计范围达到50%符号速率.而且运算量分析表明该算法复杂度较低，适合硬件实现.能够满足极低信噪比条件下突发数据通信的要求.

Abstract

A new union carrier parameter estimation algorithm based on FFT is proposed for data-aided burst mode carrier recovery. The basic idea is that firstly get a coarse estimation by using the peak of a period gram and then gain an accurate estimation by using a new interpolation formula about the two lines beside the peak. Its accuracy is close to MCRB even in very low SNR. As proved by simulation

it can accurately estimate the carrier parameter with 64 symbols even when SNR is as low as -4dB

its estimation range is about 50% of the symbol rate and it’s easy to be implemented by hardware as the analyses of complicity implied. Suitable areas of application include carrier recovery in bust mode digital transmission under low SNR circumstance.

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