摘要
在一个数据周期内嵌入M个周期为N的伪码序列,对该数据周期内的伪码序列以伪码周期为间隔进行抽取,得到长度为M的N个新序列,并组成一个N×M的矩阵,然后对该矩阵的每一行进行频域FFT,每一列进行码域FFT,这样就能同时在频域和码域中应用FFT进行伪码捕获,避免了因步进搜索而造成的捕获时间增加。仿真表明了该方法的有效性,并对仿真结果进行了理论分析,给出了硬件实现方案和测试结果。
M of PN code sequences with a cycle of N are inserted into a data cycle. The PN code sequences inserted in the data cycle are selected at an interval of the PN code cycle. N of new sequences which has a tength of M are created, and can be expressed by an N＊M matrix. Calculating the FFT in frequency field for every row and FFT in code field for every column, the parallel capture both in frequency field and in code field can be carry out simultaneously. The simulation result proves the proposed method is effective. In addition, the hard- ware applied plan and test results are also provided.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2008年第8期1407-1411,共5页
Systems Engineering and Electronics
基金
国家自然科学基金资助课题(60532030)
关键词
扩频通信
快速傅里叶变换
伪码捕获
现场可编程门阵列
spread spectrum communication
fast Fourier transforms
PN code acquisition
field programmable gate arrays
