摘要
研究了海事卫星BGAN系统中QPSK调制信号的盲解调技术。在没有信号先验知识的情况下,首先对QPSK信号进行了载波和码速率的精确估计,然后利用V&V算法进行初相位估计,去除载波信息;最后利用位同步估计算法,进行最佳抽取和比特判决,并针对V&V算法存在的4种相位模糊,利用BGAN的UW字段来解决模糊问题。经过比特文件的分析,证明此方法在几乎全盲的条件下盲解调有效。
Blind demodulation of QPSK in Inmarsat BGAN is discussed. Under the condition without any apriori knowledge of signal parameters, the carrier frequency and the bit rate are first jointly and accurately estimated, then the initial carrier phase is computed by using V＆V algorithm, so as to remove the carrier information, finally, with bit synchronization algorithm the optimal decimation and the bit decision are done. Analysis on bit documentation indicates that this blind demodulation is effective on condition of almost total blindness.
出处
《通信技术》
2012年第12期1-3,共3页
Communications Technology
关键词
海事卫星
盲解调
Uw字段
Inmarsat
blind demodulation
unique words
