Combined CCMA/CDMA: Practical Applications for Communication Systems

宽带漫游/移动无线通信面临的关键挑战之一是开发先进的无线接入技术，以高频率利用率在严重衰落的信道中实现高速、高质量的传输。协作编码多址(CCMA)和码分多址(CDMA)技术都允许由共享公共信道的几个用户有效地同时传输，而不在时间或频率上细分。该方案的主要研究重点是为CCMA/CDMA组合方案提供一种实用的设计方案，该方案将发挥各自的优点并缓解各自的局限性。到目前为止，研究主要集中在概念上的可行性研究，很少或根本没有实际执行方面的考虑。通过引入迭代译码，研究结果将提供更强大的多址接入能力和更好的性能。因此，该集团将受益于访问研究员在CCMA和CDMA方案方面的专业知识，同时建立和加强我们在低复杂性迭代解码技术方面的专业知识，通过以实际方式最大化每个信道的用户数和提高带宽效率，导致实用多址技术的重大突破。

One of the key challenges facing broadband nomadic/mobile wireless communications is to develop advanced wireless access technologies to achieve high-speed and high-quality transmission in severe fading channels with high frequency utilization efficiency. Both Collaborative Coding Multiple Access (CCMA) and Code Division Multiple Access (CDMA) techniques permit efficient simultaneous transmission by several users sharing a common channel, without subdivision in time or frequency. The main research focus of this proposal is to provide a practical design for a combined CCMA/CDMA scheme that will exploit the individual merits and mitigate individual limitations. So far research has been focused in conceptual feasibility studies with little or no practical implementation considerations. It is intended that the outcome of the proposed research will provide a more powerful multiple-access capability and a better performance by the introduction of iterative decoding. Thus the group will benefit from the visiting researcher's expertise in CCMA and CDMA schemes while building on and strengthening our expertise in low complexity iterative decoding techniques, leading to a significant breakthrough in practical multiple-access techniques through maximizing the number of users per channel and increasing the bandwidth efficiency in a practical manner.