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首页> 外文期刊>Vehicular Technology, IEEE Transactions on >A Novel Interference-Avoidance Code Reassignment for Downlink Two-Dimensional-Spread MC-DS-CDMA Systems With Power Control
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A Novel Interference-Avoidance Code Reassignment for Downlink Two-Dimensional-Spread MC-DS-CDMA Systems With Power Control

机译：具有功率控制的下行二维扩频MC-DS-CDMA系统的新型干扰避免码分配

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摘要

In the 2-D time- and frequency-domain spread multicarrier direct-sequenced code-division multiple-access (MC-DS-CDMA) system, maintaining a good code tree structure is the key to controlling the interference level. However, as users come and go, the code tree structure will be fragmented and steeped in a high level of interference. In this situation, an active call may be dropped for not being able to reach a predefined signal quality. To solve this call-dropping problem, we propose a novel code-reassignment strategy to reallocate a low-interferenced code to the could-be-dropped call. This way, not only can this possible call-dropping event be evaded, but also, a low-interferenced 2-D code tree structure can be maintained. The simulation results show that the proposed code-reassignment method can efficiently alleviate the call-dropping problem and boost the call-survival rate simultaneously. It is believed that the proposed scheme fills up an important missing link of the dynamic call-resource management for the 2-D-spread MC-DS-CDMA system.
机译：在二维时域和频域扩展的多载波直接排序码分多址（MC-DS-CDMA）系统中，保持良好的代码树结构是控制干扰水平的关键。但是，随着用户的来去，代码树的结构将变得碎片化，并受到高度干扰。在这种情况下，由于无法达到预定义的信号质量，可能会放弃正在进行的呼叫。为了解决这个掉线问题，我们提出了一种新颖的代码重新分配策略，将低干扰的代码重新分配给可能被掉线的呼叫。这样，不仅可以避免这种可能的掉话事件，而且可以维持低干扰的2-D代码树结构。仿真结果表明，所提出的代码重新分配方法可以有效地缓解掉话问题，同时提高呼叫存活率。可以相信，所提出的方案填补了二维扩展MC-DS-CDMA系统的动态呼叫资源管理的重要缺失环节。

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