一种新的多进制正交扩频通信及FPGA实现  

New M-ary orthogonal spread spectrum system and its FPGA implementation

作　　者：周映[1] 肖先赐[1] 

机构地区：[1]电子科技大学电子工程学院

出　　处：《系统工程与电子技术》2005年第12期1999-2001,2009,共4页Systems Engineering and Electronics

摘　　要：提出将一种新的按段复合的伪随机码序列应用到多进制正交扩频通信中,该序列保持了Walsh码的同步正交性,非同步时相关特性也较理想。由于复合码的内在相似性,可以用一个匹配滤波器实现输入信号和m个本地复合序列的相关运算,大大节约了FPGA资源消耗。实验证明,在高斯白噪声信道中,该硬件系统较之具有相同扩频增益的直扩系统,误比特率更低。An M-ary orthogonal spread spectrum system adopting a new composite PN code is proposed. This composite PN code preserves the synchronous orthogonality of walsh code. Besides, its asynchronous correlation is fine. Because of the inherent likeness of composite code the correlation between input signal and several local composite PN codes is pertormed by means of a matched filter. By virtue of this, FPGA resources consumed decrease. Finally, the results of experiment indicate that the system has lower BER than a DSSS with the same spread gain.

关 键 词：复合伪随机码 多进制正交扩频 现场可编程门阵列 

分 类 号：TN91[电子电信—通信与信息系统]