臺灣博碩士論文加值系統

第三代無線通訊系統有兩個主要的目標分別是增加整體系統的容量以及個別的使用者有更高的資料傳輸速率。這些服務將比傳統的系統需要更大的通訊頻寬以及更高效能的數位訊號處理技術。在本論文中，提出一個新的設計可以增加資料傳輸速率以及頻譜效率，這個設計稱為虛擬星座圖映像結合渦輪編碼器。虛擬星座圖映像有簡單的構造同時能利用來提高編碼效率，因此不要求特別高效能的數位訊號處理技術，也就是可以很容易快速的應用在實際系統上。
為了檢驗新方法的優點，我們應用虛擬星座圖映像在3GPP FDD WCDMA 系統以及以OFDM為調變基礎的無線區域網路系統。首先，將建議的設計和傳統的3GPP標準設計比較，資料傳輸速率從384 kbps 提升到450.4 kbps，增加幅度達17%。要特別強調的是，新的設計方法不更改3GPP系統內其他的元件，例如控制信號所需的位元數、QPSK調變器的傳輸速率以及WCDMA 的調變方式。也就是和原始設計使用相同的傳輸頻寬、傳輸功率以及調變方式。這種虛擬星座圖映像設計形式可以應用在multi-Carrier或以OFDM為調變基礎的無線區域網路系統。電腦模擬的結果顯示在相同的資料傳輸速率下以及相同的OFDM調變技術下，虛擬星座圖映像的設計比用時空編碼(窗格形式)在高速移動的環境有更好的效能。另外本論文建議的設計應用在這些系統：3GPP、OFDM(應用時空編碼)時，仍然保有這些系統簡單解碼程序的優點。

To achieve two main objectives, viz., to increase the system capacity and having higher data rates, of 3G system for individual users, it comes up to be the unprecedented demand on both communication bandwidth and powerful DSP processing techniques. In this thesis, a new space-time encoding scheme, referred to as the Virtual Constellation Mapping (VCM) scheme associated with the turbo encoder, is devised to enhance transmission data rate and spectral efficiency. It also alleviates the requirement of powerful signal processing technique. In fact, the proposed scheme is very simple and could be used to achieve full utilizing encoding efficiency. It means that the new scheme is easy in practical implementation. To verify the advantages of this new scheme, we apply it to both the 3GPP FDD of WCDMA system and OFDM based Wireless LAN system. First, by comparing the proposed scheme with the conventional standards 3GPP scheme, the information data rate is increased from 384 kbps information data rate to 450.4 kbps, that is 17 % improvement. It should be noted by using the new approach, other system components of 3GPP, e.g., modulation scheme, control bits and the data rate of the QPSK modulators outputs, are all the same. Moreover, this VCM scheme can be applied to the multicarrier modulation or the Wireless LAN with the OFDM modulation. Computer simulation results showed that with the same transmission data rate, our scheme is more robustness compare with the conventional space-time trellis coded OFDM scheme, in high Doppler fading channel. In addition, the proposed scheme required less decoding complexity as the standards, when it is implemented in the 3GPP system and the OFDM system with space-time trellis coding scheme.

Contents
Acknowledgementi
Abstractii
Contentsiii
List of Figures and Tablesv
Chapter 1Introduction1
Chapter 2Conventional Technologies for Data Rate and Transmission Efficiency Improvement
2.1Introduction4
2.2Models Description for Standard WCDMA and OFDM Systems5
2.2.13GPP WCDMA System5
2.2.2OFDM Based Wireless LAN System11
2.3Models Description for Laboratory Systems15
2.3.1The Channel Capacities when Using Multiple Antennas15
2.3.2Bell Labs Layered Space-Time System16
2.3.3Space-Time Trellis Coded System19
2.4Summary22
Chapter 3Spatial Diversity with Virtual Constellation Mapping
for 3GPP WCDMA System and Wireless LAN
3.1Introduction 24
3.2Virtual Constellation Mapping of QPSK Modulation25
3.2.1QPSK Communication System with Single Transmit and Receive
Antenna25
3.2.2QPSK Communication System with Multiple Transmit Antennas
and Single Receive Antenna27
3.2.3Virtual Constellation Mapping (VCM) Design31
3.3Computer Simulations39
3.3.13GPP of WCDMA System39
3.3.2OFDM Based Wireless LAN System49
Chapter 4Conclusions56
References 58

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