國立臺灣大學電機工程學系暨研究所闕志達2006-07-252018-07-062006-07-252018-07-062003-07-31http://ntur.lib.ntu.edu.tw//handle/246246/7942本計畫之主要目的是依據以前一期電信國家型計畫有關WCDMA 收發機研 究成果為基礎提出以多載波碼域多工(MC-CDMA)技術為主的下世代寬頻網際網路 無線傳輸系統。並依此規格需求建立具備智慧型天線之下行收發機系統，含基地 台發射端與手機接收端，並對所建立的系統進行實驗測試。 本計畫於第二年度內在演算法方面，提出一利用領航信號(pilot signal)得到 信號傳輸通道之特性參數，並利用估測出來的結果，做為可適性天線陣列權重調 整的依據。另外亦提出了用加權最小方差的演算法來用於多載波碼域多工 (MC-CDMA)基頻接收機中的聯合估測載波頻率偏移與取樣時脈偏移。運用適當的 加權則可使估測的均方根誤差最小，並使得次載波間的干擾可以降低。在電路架 構上提出一修正發射機中功率放大器的非線性現象的預失真的補償方法。基頻接 收處理方面亦已完成處理器的架構設計及細部模擬與FPGA 實作驗證。In our previous project we have successfully built a 3GPP WCDMA base station receiver with smart antenna capability. This project uses the MC-CDMA as the downlink physical layer technique. This not only can complement our previous work on 3GPP uplink receiver implementation but also provides a backward-compatible evolutionary next-generation wireless standard for wide-band wireless internet services. In the second year, we have proposed a new pilot-based channel estimation algorithm for the OFDM system and have successfully applied the estimaiot n to adaptive antenna array. We have also proposed jao int carrier frequency and timing frequency offset estimation algorithm using a weighted least square techniqueIn. addition, to combat then on-linearity impairment of the transmitter power amplifier, a pre-distortion technique has been implemented and tested on multi-carrier signals and was shown to be able to reduce the backoff in PA by 4 dB.. Finally, the baseband receiver architecture has beend esigned and detrial circuit design and FPGA emulation reveal the efficacy of the proposed architecture.application/pdf1030419 bytesapplication/pdfzh-TW國立臺灣大學電機工程學系暨研究所多載波碼域多工智慧型天線通道參數估測預失真補償同步演算 法基頻接收機MC-CDMAadaptive arraychannel estimationpre-distortion compensa- tionsynchronizationbaseband receiverreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/7942/1/912219E002022.pdf