多重信號多工技術之數位信號處理實作

DSP Implementation of Multi-signals Multiplexing

江彥良(Yan-Liang Chiang)

指導教授 ： 林信標

國立臺北科技大學/機電學院/電腦與通訊研究所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00123

摘要

本論文利用一種新的信號處理技術在不改變傳輸通道條件下，同時傳送多組信號。將此技術融入現行通訊系統中，有助提昇資料傳輸率。此信號處理技術首先探討如何找出正交弦式信號，傳送端利用這些正交弦式信號將輸入信號作編碼及混合。接收端並利用相對應的正交弦式信號將接收到的信號正確無誤的分離。在此部份利用軟體模擬方式驗證。
再者，本論文將此信號處理技術架構在數位信號處理器(Digital Signal Processor, DSP)來實現一完整的通訊系統，並驗證系統的效能。過程中利用了delay and correlation演算法正確偵測出封包的起始位置，並以上升餘弦內插法解決因為傳送端與接收端取樣頻率不同所造成的時序誤差。接著從實際測試中，同時傳送兩組信號，驗證此系統在不增加傳輸通道條件下，確實能將傳送信號混合傳輸後，於接收端仍能正確無誤的分離，達到同時傳輸多組信號的目的，其正確解碼分離信號的正確率為98.22%。

關鍵字

正交編解碼 ； 數位信號處理器 ； 封包偵測 ； 時序回覆

並列摘要

In this thesis, a novel signal process method is proposed to be used in communication system and which could mix multi-signals in a narrowband. First, finding the orthogonal sinusoids signals for encoding and decoding will be discussed. We also verify by the software.
Furthermore, not only the software simulation but also the DSP implementation is presented to prove the feasibility of this novel signal process method. In order to solve the problems of synchronization, we separate into two parts. 1.) To detect start of packet by delay and correlate algorithm. 2.) To solve timing delay by raised cosine interpolation.
In the implementation results, when two signals are transmitted in wired channel they could be mixed and separated by this integrated communication system and the packet correct rate of the system could achieve 98.22%.

並列關鍵字

Orthogonal Encode & Decode ； Digital Signal Processor ； Packet Detection ； Timing Recovery

參考文獻

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