基于多符号检测的连续相位频移键控信号定时同步方法

刘田; 马松; 袁田; 邵士海

doi:10.11999/JEIT180060

基于多符号检测的连续相位频移键控信号定时同步方法

doi: 10.11999/JEIT180060

刘田¹,
马松^1, ,,
袁田¹,
邵士海²

1.
中国电子科技集团公司第十研究所成都 610036
2.
电子科技大学通信抗干扰技术国家级重点实验室成都 611731

详细信息

作者简介:
刘田：男，1981年生，高级工程师，主要研究方向为空间通信与导航

马松：男，1990年生，工程师，主要研究方向为测控通信

袁田：男，1989年生，工程师，主要研究方向为网络与卫星应用

邵士海：男，1980年生，教授，主要研究方向为无线与移动通信

通讯作者:
马松　 ma_song@139.com

中图分类号: TN91
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出版历程
- 收稿日期: 2018-01-16
- 修回日期: 2018-06-20
- 网络出版日期: 2018-07-18
- 刊出日期: 2018-11-01

Timing Synchronization Method for Continuous Phase Frequency Shift Keying Signal Based on Multi-symbol Detection

1.
The 10th Research Institute of China Electronics Technology Group Corporation (CETC), Chengdu 610036, China
2.
National Key Laboratory of Communication, University of Electronic Science and Technology of China, Chengdu 611731, China

摘要

摘要: 连续相位频移键控(CPFSK)作为遥测体制标准被广泛采纳。多符号检测(MSD)技术能够降低CPFSK信号的解调门限，这要求CPFSK定时同步方法能够在更低的信噪比条件下正常工作。针对现有的CPFSK定时同步方法在低信噪比下同步困难的问题，该文提出一种基于MSD的CPFSK定时同步方法，且适应可变符号速率CPFSK信号接收。数值仿真结果表明，在E_b/N₀为0 dB，符号速率为2 Mbps的情况下，该方法的误比特率性能比传统单符号间隔似然检测同步方法提高2 dB；与MSD迟早门时延同步方法性能相近，但消耗的硬件资源不及后者的40%。原理样机实测结果验证了数值仿真和资源评估的正确性。
- 定时同步 /
- 连续相位频移键控 /
- 多符号检测 /
- 可变速率
Abstract: Continuous Phase Frequency Shift Keying (CPFSK) is widely adopted as a standard by the telemetry community. The Multi-Symbol Detection (MSD) technique can increase channel gain for the CPFSK telemetry system. Therefore, the timing synchronization method for CPFSK signal needs to adapt to the scenario with lower SNR. According to existing timing synchronization methods’ poor performance in low SNR, a novel timing synchronization method for CPFSK signal based on MSD is proposed, which is suitable to variable rate. The simulation results show that, when E_b/N₀ is 0 dB and symbol rate is 2 Mbps, the proposed method achieves 2 dB more channel gain than the single symbol likelihood decision method, and has similar performance to the early-late gate code synchronization method with reduced hardware resource by 60%. Finally, the validity of the numerical simulation and resource evaluation is verified by principle prototype realization.
- Timing synchronization /
- Continuous Phase Frequency Shift Keying (CPFSK) /
- Multi-Symbol Detection (MSD) /
- Variable-rate

HTML全文

图 2 重采样结构示意图

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图 1 非相干接收机模型

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图 3 似然检测仿真曲线

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图 4 相位误差鉴别曲线

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图 5 定时误差曲线

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图 6 不同符号速率获得的定时误差方差

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图 7 不同符号速率下的BER曲线

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图 8 不同定时恢复方法的定时误差方差

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图 9 采用不同定时恢复方法的MSD解调BER曲线

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图 10 样机实测与理论的BER性能

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表 1 参数列表

参数名称	参数取值
信号体制	CPFSK
符号速率f_c	2 Mbps
调制指数h	0.7
符号速率倍数D	8
MSD观察符号数目	5

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表 2 硬件资源占用情况

硬件资源	基于MSD的迟早门时延同步	基于MSD的CPFSK定时同步方法	节省资源(%)
查找表	33236	4648	86.02
寄存器	27700	4217	84.78
RAM (bit)	30480	11904	60.94
9×9 DSP单元	424	42	90.09

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