摘要
为了提高GMSK信号在高码速率传输下的同步性能,研究了Gardner算法在GMSK解调中的应用。在发射接收两端采样存在晶振漂移的情况下,Gardner算法很好地纠正了采样频偏,准确地找到最佳采样时刻的判决信息。得益于其简单的同步结构,Gardner算法使得GMSK信号可用更高的码速率传输,同时简化了硬件电路。实验结果表明,在20 Mbps码速率的GMSK信号传输中,Gardner算法很好地完成了位同步,联合维特比解调,在9.5 dB的信噪比下达到9×10^(-5)的误码率性能。
In order to improve the synchronization performance of GMSK signals under high code rate transmission,the application of Gardner algorithm in GMSK demodulation is studied.In the case where the crystal oscillator drift exists in the sampling at both transmitting and receiving ends,the Gardner algorithm corrects the sampling frequency offset well and accurately finds the decision information of the optimal sampling time.In addition,thanks to its simple synchronization structure,the Gardner algorithm allows GMSK signals to be transmitted at higher code rates while simplifying the hardware circuitry.Experiments show that the Gardner algorithm performs bit synchronization well in the GMSK signal transmission at the code rate of 20 Mbps,and achieves a bit error rate performance of 9×10^-5 with a 9. 5 dB signal-to-noise ratio in combination with Viterbi demodulation.
作者
顾圣明
陈丽婷
陈建斌
GU Shengming;CHEN Liting;CHEN Jianbin(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)
出处
《无线电工程》
2019年第6期527-533,共7页
Radio Engineering
基金
国家部委基金资助项目
关键词
高斯最小频移键控
位同步
GARDNER算法
软件无线电
Gaussian minimum frequency shift keying
bit synchronization
Gardner algorithm
software radio
