本文從空間電磁場的數學描述出發，提出了無線通信中使用電磁波信號的幅度、輔助極化角與極化相位差異角進行三維調製的理論和方法，建立了三維極化幅度調製信號的模型，給出了基於矢量天線實現三維調製的方法。
基本介紹
- 中文名：三維數據機的理論研究
- 類別：研究
- 類型：理論
- 對象：解調器
中文摘要,外文摘要,
中文摘要
為了對研究的三維調製信號進行解調，本文根據收發天線數量和位置的不同，提出了分別適用於單信號源單矢量天線接收、單信號源矢量天線陣列接收和多信號源矢量天線陣列接收等幾種情況的三維調製信號的解調方法，其中包括：收發天線正對時的解調方法及天線方向的校正方法；已知DOA方向的最小二乘解調方法；未知DOA方向的總體最小二乘解調方法；矢量天線陣列各方向...
為了對研究的三維調製信號進行解調，本文根據收發天線數量和位置的不同，提出了分別適用於單信號源單矢量天線接收、單信號源矢量天線陣列接收和多信號源矢量天線陣列接收等幾種情況的三維調製信號的解調方法，其中包括：收發天線正對時的解調方法及天線方向的校正方法；已知DOA方向的最小二乘解調方法；未知DOA方向的總體最小二乘解調方法；矢量天線陣列各方向噪聲不同情況下的加權最小二乘解調方法和基於ESPRIT的多個信號源解耦最小二乘解調方法等。對所提出解調方法誤碼率性能的分析與仿真結果表明：提出的三維數據機具有信息傳輸速率高、系統誤碼率低等特點。同時，幾種解調方法的比較研究結果也為人們根據不同的套用情況來選擇適當的解調方法提供了參考。
為了有適應三維調製解調的三維星座圖，本文研究了以格理論為工具來構造三維星座圖的新方法，設計了發射功率最小且誤碼率最低的新型三維六角形星座圖，並給出了這種三維六角形星座圖的基礎編碼增益、成形增益、平均功率和誤碼率等參數的計算方法。藉助於所給出的計算方法，本文對三維六角形星座圖和現有的幾種三維星座圖進行了對比研究。分析與仿真結果均表明：本文所提出的三維六角形星座圖具有發射功率小、誤碼率低等優點，具有廣泛的套用價值。
為了更深入地分析三維星座圖所對應三維調製信號的頻譜特性，本文推導了三維調製信號功率譜的計算公式，並利用它們對三維六角形星座圖對應調製信號的功率譜進行了分析與仿真。為了抑制其功率譜中存在的離散譜分量，本文提出了不含離散譜分量三維星座圖的設計方法和脈衝信號的成形方法。分析與仿真結果表明，這兩種方法均可使離散譜分量得到有效抑制。
本文還仿真實現了三維數據機系統，建立了其發射端和接收端的系統模型，並通過System View軟體繪製了三維數據機的電路原理圖，並對三維調製解調過程進行了動態仿真，實驗結果表明，仿真信號的波形、星座點分布以及功率譜密度與理論值相符合，驗證了本文對三維數據機性能的分析結果。
關鍵字：三維數據機，矢量天線，空間電磁場方程建模，三維星座圖， System View仿真
外文摘要
Based on the mathematical description of the space electromagnetic field, a novel approach to the three-dimensional modulation by the signal amplitude, polarization angle and polarization phase angle of an electromagnetic signal in wireless communication is presented in this paper. The model of the three-dimensional modulation signal is first given. Then, the transmission implementation of the three-dimensional modulation signal is discussed by a vector antenna.
With the different antenn...
Based on the mathematical description of the space electromagnetic field, a novel approach to the three-dimensional modulation by the signal amplitude, polarization angle and polarization phase angle of an electromagnetic signal in wireless communication is presented in this paper. The model of the three-dimensional modulation signal is first given. Then, the transmission implementation of the three-dimensional modulation signal is discussed by a vector antenna.
With the different antenna number and locations of the transmitting and receiving antennas, the different demodulation methods for the single-source single vector antenna, single-source vector antenna array, and multi-source vector antenna array cases are respectively studied to demodulate the received three-dimensional modulated signal. When the transmitting and receiving antennas are aligned or when the direction of arrival is known, a least squares demodulation method is presented. The total least squares demodulation method is given to the situation where the direction of arrival is unknown. The weighted least squares demodulation method is used to handle the antennas components with different noises. An ESPRIT decoupling based least squares demodulation method is proposed to the multi-source input case. Furthermore, the symbol error probability and the performances of all the proposed demodulation methods mentioned as above are analyzed in this paper. Both the analysis and the simulation results show that a high information transmission rate and a low symbol error probability can be simultaneously obtained by the proposed three-dimensional modulator and demodulator. Meanwhile, how to select the appropriate demodulation method under different cases is also given.
A lattice theory approach to the construction of novel three-dimensional signal constellations is reported. The constructed three-dimensional hexagonal constellation is shown having the highest coding gain and the minimum average transmit power. The calculation methods of the basic coding gain, forming gain, average power and symbol error probability of the proposed three-dimensional constellations are also given. By means of these given calculation methods, we compare the novel three-dimensional constellation with the existing three-dimensional constellation. The analytical results show that our three-dimensional constellation approaches to the lowest symbol error probability and the minimum average transmit power.
The power spectrum characteristics of the three-dimensional modulation signal corresponding to the three-dimensional constellation are derived. The suppression methods of the discrete spectral components of the three-dimensional hexagonal constellation are given. How to design the three-dimensional constellation which does not contain the discrete spectral components and form the pulse signal is discussed. Both the analysis and the simulation results show that the discrete spectral components in the power spectrum can be controlled.
The implementation techniques of the three-dimensional modulator are studied. The model and the circuit of the three-dimensional modulator are implemented by the software System View. The simulation results of the signal waveform, the distribution of constellation points, the power spectral density curve and the symbol error probability performance are given. The simulation results verify the correctness of the analytical results.
Key words: three-dimensional modulator and demodulator, vector antenna, space electromagnetic field, three-dimensional constellation, SystemView simulation
