超寬頻系統信號與波型效能分析

Analysis of Pulse Shapes and Signal Performance for Ultra Wideband Systems

初永華(Yung-Hua Chu)

指導教授 ： 涂世雄

中原大學/工學院/電機工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500083

摘要

摘 要
在本論文超寬頻系統中，使用各種脈衝波和不同信號調變傳輸的技術作位元誤碼率性能分析比較後，我們成功的以軟體模擬超寬頻信號系統模型並結合附加白高斯雜訊完成建立該系統架構。
在本論文分析的步驟為，第一，發射端信號技術分析，以不同脈衝波及M-陣列調變技術進行信號分析後結果，選擇執行成效最佳誤碼率的高斯二階微分脈衝波及M-ray為4時跳時位置調變作為發射信號傳送。第二，接收端信號技術分析，採用時間同步的跳時位置調變通信系統方式處理，信號分析程序包含偵測，擷取虛擬雜訊及資料同步後，經基本關聯性的演算法後給於接收端適當同步控制可以接收到發射的信號，並在此系統建立白色高斯雜訊通道後，系統也能夠接收發射訊號，成功完成了超寬頻系統架構建立。
依據軟體模擬分析可獲得以下結果:
1.在系統發射信號以跳時展頻及直接序列展頻調變，增加虛擬雜訊序列在功率頻譜密度會變得平坦。
2.在系統加入白色高斯雜訊通道後接收端能夠接收發射訊號，此系統具有抗干擾的能力。
相信本論文對於超寬頻信號系統模型模擬的建立與分析，會更加了解超寬頻系統運作架構，以便日後實際建構系統有參考依據。

關鍵字

脈衝波 ； 白色高斯雜訊 ； 超寬頻

並列摘要

Abstract
In this thesis, the performance of various pulses shapes and different signals modulation techniques in the Ultra Wideband (UWB) system design are analyzed. The simulations of performance for our systems are executed by combining the Additive White Gaussian Noise (AWGN) channels. It is confirmed that the implementation of the UWB system model structure by the authors is successful.
The analysis steps of this thesis are as follows. First, the transmitted scheme is analyzed. The analysis is made with various pulses shapes and different baseband M-ary transmissions modulation schemes. The performance index we used is the Bit Error Rate (BER) of these schemes. By comparing these performance indexes, we fine that the second derivative Gaussian pulse and 4-ray Pulse Position Modulation (PPM) modulation turned out to have better BER performance.
Second, the received scheme is analyzed. The analysis is made for the time synchronization with the Time Hopping Pulse Position Modulation (TH-PPM). The analyzed procedures are mainly composed of signal detection, the acquisition of Pseudo-Noise (PN) sequence and the data synchronization. By executing the correlation-based algorithm, the receiving blocks appropriate synchronizations controls can be acquired.
According to software simulations, there are some research results in this thesis as follows:
1. The power spectra reveal the smoothing effect in both Time Hopping (TH) and the Direct Sequence (DS) spread spectrum modulations by increasing PN sequence length.
2. The interference robustness of UWB communications will be obtained by eliminating the effects of multi-path fading as the received signals adding AWGN channel.
As expected, the UWB system will be employed in the future. This thesis successfully provides the necessary analysis and a practical model for implementing the UWB system.

並列關鍵字

UWB ； AWGN ； Pulse Shapes

參考文獻

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