Long Term Evolution - unlicensed (LTE-U)通訊技術是為了因應目前行動網路執照頻譜短缺所誕生的技術。將目前主流行動網路技術運行於較為空閒的非執照頻段，可以有效的增加行動網路傳輸速度和效能，然而另一套廣為使用的無線通訊系統WiFi，也是運行於此非執照頻段。因此LTE-U和WiFi間的干擾抑制是需要謹慎設計的。基於此出發點，本篇論文將認知無線電技術引進，並且藉由通道偵測技術定
位出WiFi傳送端位置及傳輸功率 對LTE-U的下行通訊進行頻譜資源分配。我們旨在設計一個，最佳的頻譜資源分配方法，從而使LTE-U系統的傳輸速度最大化。此外，我們藉由通道偵測方法定位出WiFi傳送端位置，並且由此資訊來控制LTE-U下行鏈路的傳輸功率，以保護WiFi系統免於受到過大的干擾。實驗結果證實了，我們的方法有效提升LTE-U下行鏈路傳輸速率。

Long Term Evolution - unlicensed (LTE-U) is a new technology proposed by 3GPP to enable LTE-A transmit in unlicensed band. By access the unlicensed band LTE-A system can support more traffic and high data rate. However, it is hard to guarantee the transmission quality
in unlicensed band. Because their may be other wireless system transmit in same band. Consider this issue, we proposed CR based LTE-U system resource allocation methods. The main idea is using CR technology to figure out other wireless system information in the environment and try to use the spectrum resource which is not been used currently. As soon as we obtain the spectrum resource in the area, we proposed an optimal resource allocation method for DL LTE-U transmission to maximum the system throughput.

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