無線基頻前引及導向訊號處理之低複雜度演算法研究設計

Abstract

在任何無線通訊系統中，由於傳輸環境具有相當大的不確定性與各種干擾，因此皆會有前引訊號或是導向訊號之設計。接收端通常需要比對接收訊號以及已知之前引、導向訊號來做為同步之用。然而，這個“比對”的動作將會耗費相當大的運算複雜度。 在全球環保意識抬頭之下，綠能電子是必要的技術發展趨勢。本論文將針對無線基頻前引及導引訊號處理之低複雜度演算法進行研究以及設計。本論文除了將針對前引及導引訊號做處理之外，亦將探討當此低複雜度演算法運用在接收機上之功能方塊時之效應，進而比較其系統效能以及所能減低之運算複雜度，擬探討之應用系統包含新的、在制定中之第四代無線通訊標準LTE/LTE-A系統與802.16e/802.16m系統。本論文在系統效能以及所減低之複雜度上將能提供全面且完整之分析結果，並在系統設計方面提供給設計者一個全新的切入點。

In wireless communication, due to severe uncertainty and all sorts of interferences in practical transmission environments, generally preamble and pilot signals are designed and included in a wireless communication system to facilitate the system’s initial synchronization and later tracking operations. The preamble and pilot signals are known sequences to both transmitter and receiver during communication. Regardless of preamble or pilot signals, the receiver needs to “match” the received signals with the known preamble/pilot signals for the synchronization purpose. No matter what synchronization algorithm is adopted, such matching operation costs significant computational complexities. Therefore, for long-term operation of a mobile device and environmental protection awareness, low-power consumption is a necessity. In addition to investigating “green” algorithms, we will investigate and design the low-complexity algorithms for wireless baseband preamble and pilot based signal processing, for achieving the low-complexity transmitter and receiver design. Besides, this thesis will also investigate the effects of the low-complexity algorithms on each functional block in the receiver for the tradeoff issue between the system performances and computational complexities. This thesis will specifically consider the application designs of LTE/LTE-A Standard, 802.16e/802.16m Standard. This thesis will conduct a comprehensive result of the tradeoff between the system performances and the complexities. For the system designer, this result also can provide a whole new breakthrough point for the next-generation wireless communication system.