Orthogonal complementary codes for interference-free CDMA technologies
Orthogonal complementary codes for interference-free CDMA technologies
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DOI：
10.1109/mwc.2006.1593527
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发表时间：
2006-02
影响因子：
12.9
通讯作者：
Hsiao-Hwa Chen;Hsin-Wei Chiu;M. Guizani
中科院分区：
文献类型：
--
作者：
Hsiao-Hwa Chen;Hsin-Wei Chiu;M. Guizani
本文讨论了用于B3G无线通信的下一代码分多址技术的问题。为了设计一个性能不再受干扰限制的码分多址系统，需要解决许多具有挑战性的问题，如新颖的码集，有效的扩频和载波调制方案，以及用于高速突发业务的信令格式。本文回顾了我们正在进行的下一代码分多址技术的研究。特别是，我们提出了一种新的码分多址设计方法--真实环境适应线性化(REAL)，该方法可以产生对上行链路和下行链路传输的多径干扰和多址干扰具有固有免疫力的CDMA码集。同时还证明了无干扰的码分多址只有在正交互补码的帮助下才能实现。文章进一步揭示了这种无干扰码分多址的小区容量等于分配给每个用户的元素码数，从而使ofdm成为实现无干扰码分多址的自然选择。本文还讨论了OCC-CDMA的其他几个问题，如系统实现和性能。
This article addresses the issues of next-generation CDMA technologies for B3G wireless communications. To engineer a CDMA system whose performance will no longer be interference-limited, many challenging issues should be tackled, such as novel CDMA code sets, efficient spreading and carrier modulation schemes, and signaling format for high-speed burst traffic. This article reviews our ongoing research on next-generation CDMA technologies. In particular, we propose a new CDMA code design methodology, real environment adapted linearization (REAL), which can generate CDMA code sets with inherent immunity against multipath interference and multiple access interference for both uplink and downlink transmissions. It is also shown that interference-free CDMA can only be implemented with the help of orthogonal complementary codes. The article goes further to reveal that cell-wise capacity for such interference-free CDMA is equal to the number of element codes assigned to each user, making OFDM a natural choice to implement interference-free CDMA. Several other issues of OCC-CDMA, such as its system implementation and performance, are also addressed in this article.