摘要：超頻寬,UWB,技術是一種借助雷達技術概念的超短電磁脈衝收發技術，將脈衝能量由專用寬帶天線擴展至GHz量級的頻寬寬內，短距離連接速率可高達數百Mbps，這是一種值得注意且正在萌芽中且極具發展潛力的新技術。此外，在較高的毫米波頻率可提供較寬的頻寬，及較少干擾的頻段。目前的毫米波無線通信仍未採用超寬頻技術，本計畫將結合超寬頻的數位調變及毫米波無線收發系統技術，以達成較目前無線區域網路 ,WLAN, 快10倍 ,100 500Mbps, 的寬頻通信之功能。本子計畫首先將進行毫米波無線收發系統架構的探討，就著現有的軟體無線電技術，結合系統模擬軟體與現有射頻儀器來研究系統架構的最佳化，也為其他子計畫所發展的元件模組進行整合與規格最佳化。
現代數位調變訊號對功率放大器的非線性失真相當敏感，傳統上我們都會降低此功率放大器的最大操作功率，稱作Power Back Off，如此來符合通信系統線性度的要求，但這將會使效率下降，尤其是對一些有高Peak to Average的數位調變訊號,如UWB的OFDM信號,，Power Back Off必須更多，效率也將嚴重的下降，在低耗電的應用中此問題將更嚴重。為
Abstract: The Ultra Wide Band ,UWB, technique is originated from the transceiver of the pulse radar, which radiates short pulses of GHz bandwidth. The UWB can transmit several Mbps data in a short range. On the other hand, the millimeter-wave band has more bandwidth and less interference. This project will combine the above two techniques, UWB and millimeterwave radio, together to realize a broadband communication which is ten times ,100 500Mbps, faster than WLAN. This sub-project will use the software defined radio techniques to study the architecture of millimeter-wave UWB transceiver. The system architecture is optimized through the system simulator and other RF test equipments. This study will also facilitate the integration of components and modules from other sub-projects and specification optimizations.
The modern digital modulated signals are very sensitive to the PA distortions. The conventional PA will have power back-off to meet the system linearity requirements, which will also significantly reduce the efficiency. For the higher peak to average ratio signal ,like, OFDM in UWB,, more power back-off is required, which means lower efficiency. These linearity problems will limit UWB capability for low power consumption applications. To solve these problems, several linearization techniques are proposed. This sub-project will select predistortion linearization to implement the millimeter-wave ,40-48GHz, power amplifier, which has the advantages of low-cost, small size, simple structure, and high PAE.