一种非对称IDMA交织器的设计及分析

Design and Analysis of Asymmetric IDMA Interleaver

交织分多址(IDMA)通信系统采用不同的交织器来区分不同的用户,各用户使用相同的扩频序列进行扩频,所以交织器在IDMA保密通信性能上有关键的作用.目前还没有关于具保密通信功能的IDMA交织器设计的研究.为此,文中提出了一种非对称IDMA交织器设计方案,该方案基于离散Arnold映射,通过类似非对称密钥加密的方法实现保密通信.仿真结果表明,文中提出的交织器不但在通信性能上等同于伪随机交织器,而且能提供保密通信的功能.

In an interleave division multiple access （IDMA） system, different interleavers are used for different users, and all the users employ a common spreading sequence to spread the spectrum. Hence, interleaver plays a key role in the IDMA secure communication. As there are no interleaver designs for IDMA secure communications, this paper proposes a design scheme of an asymmetric IDMA interleaver based on the discrete Arnold map, which implements the secure communication via the method similar to the asymmetric encryption scheme. Simulated results show that the proposed interleaver is of the performance as good as that of the pseudo random interleaver, and that it is effective in performing secure communications.