摘要
8PSK解调存在7种相位模糊,传统的方法不能解决所有的相位模糊。以IP核为基础,设计了能克服7种相位偏转的功能电路。详细地阐述了相位模糊分辨编译码器、归一化速率监控电路、分支旋转和扇区值旋转电路的设计等,并进行了克服相位模糊的纠错性能测试。仿真测试结果表明,设计的PTCM+8PSK译码电路有很好的克服相位模糊的纠错能力,且在信噪比较低的情况下,有很好的纠错性能。
The demodulation of 8PSK has seven kinds of phase ambiguity.The conventional methods can＇ t solve all kinds of phase ambiguity.The paper uses the Viterbi IP core of Altera Company and designs the function logic which can overcome seven kinds of phase ambiguity. It explains detailedly how to design the coder and decoder of phase ambiguity resolution, how to design the normalization rate monitor logic and how to design the rotate logic of branch metric and sector number.The error-correcting experiment is done to overcome phase ambiguity.The simulated experimental results show that the PTCM decoder designed has the good ability of resolving phase ambiguity,and in the condition of low SNR,it has the good ability of error-correcting.
出处
《无线电通信技术》
2014年第1期90-92,共3页
Radio Communications Technology
