摘要
在通信系统中,同步问题是实现信号正确解调的关键技术之一。为实现同步,提出了一种基于m序列的同步方法。该方法首先对接收信号进行差分相干解调得到解调序列,然后对解调序列与本地m序列同或运算后的结果按位求和,最后通过和值与门限的比较判断是否同步。其中同或求和操作避免了复杂的相关处理过程,运算速度快并节约了硬件资源。整个过程的实现基于Xilinx公司的Spartan 6系列FPGA平台,仿真调试表明该方法能够准确同步且稳定度高。
In the communication system,synchronization is one of the key technologies to realize the correct signal demodulation. To achieve synchronization,a synchronization method based on m-sequence is proposed in this paper. At first,the demodulation sequence is got by the differential coherent demodulation operation of the received signal;then,all bits of the result of the demodulation sequence and the local m-sequence′s with-or operation are summed;finally,the comparison of the sum value and the threshold is carried out to judge whether the synchronization is achieved. The sum of the with-or operation′s result avoids the complex relevant operation,which performs fast and save the hardware resources. The implementation of the entire process is based on the Spartan6 series′ FPGA of the Xilinx Company. The simulation results show that the method can accurately realize the synchronization and has high stability.
出处
《现代电子技术》
2014年第21期41-44,共4页
Modern Electronics Technique
