Abstract:

On the basis of the analysis for Intergroup Complementary(IGC) code and zero correlation zone complementary code, a modified IGC code is proposed to adapt M-ary orthogonal code spreading spectrum system or quasi-synchronous CDMA system. Theoretical research and simulation results show that the main advantages of the modified IGC code are as following: The code sets of the modified IGC code is more than IGC code under the same code length. The zero correlation zone length is longer than the intergroup IGC code, but shorter than the intergroup IGC code. Under the same code length, the auto-correlation performance of the modified IGC code is better than that of the IGC code, and both are of similar cross-correlation performance.

Key words: orthogonal code spreading spectrum, modified intergroup complementary code, Matlab simulation, zero correlation zone code, generalized orthogonal code

摘要：

在分析组间互补码、零相关区正交互补码的基础上，构造一种适合于多进制正交码扩频系统或准同步CDMA系统的正交码集――改进的组间互补码。通过理论分析与性能仿真表明，改进的组间互补码的集合数量多于组间互补码；零相关区长度大于组内组间互补码，但比组间的组间互补码小；在相同码长条件下，改进的组间互补码的自相关特性优于组间互补码，互相关特性与组间互补码相当。

关键词: 正交码扩频, 改进的组间互补码, Matlab仿真, 零相关区码, 广义正交码

CLC Number: 

• TN914.53