IDMA系统的(p,q)交替进制交织器的研究  

(p,q) Alternate-Decimal Interleavers in IDMA system

作　　者：金胜财[1] 顾村锋[1] 陈歆炜[1] 吴文[1] 

机构地区：[1]南京理工大学近程高速目标探测技术国防重点学科实验室,南京210094

出　　处：《信号处理》2010年第11期1742-1746,共5页Journal of Signal Processing

摘　　要：多址技术一直是移动通信领域的一项关键技术。IDMA是一种新的多址接入方式,该技术采用了一种码片级Turbo型迭代多用户检测,其算法复杂度与用户数无关,因此在通信领域获得广泛关注。交织器作为IDMA系统区分用户的唯一方式,研究这一问题具有重要意义。本文提出一种利用(p,q)交替进制位反序构造IDMA系统中交织器的方法。该方法通过选择合适的p、q值,可以构造出一组正交交织器。由于对每个用户仅需存储p和q值,因而只需少量存储器。为了硬件实现方便,选择p,q均为2的幂次,对位置索引的二进制表示进行块间反序即可得到交织后的位置索引。相关性峰值分析表明本文构造的交织器之间的相关性低于随机交织器。误码率仿真结果表明,采用本文构造的交织器的IDMA系统BER性能优于采用随机交织器的IDMA系统。Multiple access technology is a great problem in communication systems.Interleave-division multiple-access（IDMA） is a new scheme of multiple access technology.It employs a chip by chip iterative multi-user detector to separate data from different users. IDMA is attractive for the future mobile communication system for its low cost multi-user detector（MUD） and robustness to interference and noise.Since interleavers are the only means to separate data from different users,it is important to design a good set of interleavers. A set of interlevers based on reversal of（p,q） alternate-decimal indexing are designed for IDMA systems in this paper. With proper selection of p and q,orthogonal interleavers can be designed.Few registers are needed because only the values of p and q should be stored for each user.If both p and q are powers of two,the algorithm is easy to be realized in hardware.The index after interleaving can be generated by reversing the binary form block by block,and no more operations are excluded.The peak basis correlation （PBC） of the proposed interleavers and random interleavers has been analyzed in this paper.The PBC of the proposed interleavers is orthogonal, which outperform random interleavers.Bit error rate（BER） simulation results show that the IDMA system using the proposed interleavers performs better than that using random interleaves.

关 键 词：多址接入 交织分多址 交织器 相关性峰值 

分 类 号：TN914.5[电子电信—通信与信息系统]