無線衰減通道中非線性調變最佳陣列接收機

Optimal Array Reception for Nonlinear Modulation in Wireless Fading Channels

陳振豐(Jern-Feng Chen)

指導教授 ： 趙耀庚

元智大學/工程學院/電機與資訊工程研究所/碩士(1998年)

摘要

本篇旨在於研究無線衰減通道中非線性調變最佳陣列接收機，其中非線性調變信號，主要針對MSK及GMSK。
在無線衰減通道中最佳陣列接收機，我們研究並比較兩種接收方式，如下：
I. GMSK調變信號通過無線衰減通道，接收機經由CMA(Constant Modulus Algorithm) Adaptive Array Antenna接收信號，並依照MLSE理論建構其最佳接收機，此種最佳接收系統在以下本文簡稱「GMSK-CMA Adaptive Array最佳接收機」。
II. MSK調變信號通過無線衰減通道，依照「相關性Rayleigh衰減通道中FSK最佳多枝分集接收機」[1]論文中所推導的理論而建構的最佳接收機，此種最佳接收系統在以下本文稱為「相關性Rayleigh衰減通道中MSK最佳多枝分集接收機」。
在本文中，兩者調變信號皆是採用Viterbi Algorithm的檢測方式，檢測出信號，並各自使用了二根及四根的陣列天線架構，進而利用Matlab Software做BER效能的數值分析。
在分析數據中，歸納得出以下的結果：
(1)當「GMSK-CMA Adaptive Array最佳接收機」其信號在BER = 1.0E-3時，二根陣列天線所需的SNR為20dB，四根陣列天線所需的SNR為11dB。
(2)當「相關性Rayleigh衰減通道中MSK最佳多枝分集接收機」其相關位元數J=3、BER = 1.0E-3時，二根陣列天線所需的SNR為14dB，四根陣列天線所需的SNR為8.5dB。

關鍵字

相關性Rayleigh衰減通道 ； 最佳陣列接收機 ； 可適性陣列天線 ； Viterbi演算法

並列摘要

This treatise is major in researching Nonlinear Modulated Optimum Array Receiver in wireless fading channels. In this article, primarily using "MSK" and "GMSK" nonlinear modulated signals.
In wireless fading channels, we develop and compare the two receiving methods that is describing below:
1.When GMSK modulated signals transmitted through wireless fading channel, the receiver receive it by CMA (Constant Modulus Algorithm) Adaptive Array Antenna. Besides, we construct a optimum receiver according to the theorem of MLSE. Such optimum receiving system is abbreviated "GMSK-CMA Adaptive Array Optimum Receiver" in the following content.
2.When MSK modulated signals transmitted through wireless fading channel, the receiver's construction is base on the theorem in the treatise " Optimal Diversity FSK Receiver in Correlated Rayleigh Fading Channel" [1]. Such optimum receiving system is abbreviated "Optimal Diversity MSK Receiver in Correlated Rayleigh Fading Channel."
In this paper, both modulated signals use Viterbi Algorithm Detecting Method to detect signals. In addition, both of them using two and four array antennas' frameworks. At last, analyzing the effective of BER through the software "Matlab".
We collect all the testing parameters and get the following results:
1.When signals in " GMSK-CMA Adaptive Array Optimum Receiver", set BER= 1.0E-3, we get the results of SNR=20dB in two array antennas and SNR=11dB in four array antennas.
2.When signals in "Optimal Diversity MSK Receiver in Correlated Rayleigh Fading Channel ", set Bit J=3 and BER=1.0E-3, we get the results of SNR=14dB in two array antennas and SNR=14dB in four array antennas.

並列關鍵字

Correlated Rayleigh Fading Channel ； Optimal Array Reception ； Adaptive Array ； Viterbi Algorithm

參考文獻

[2]Amit Shah, and Alexander M. Haimovich, "Performance Analysis of Optimum Combining in Wireless Communications with Rayleigh Fading and Cochannel Interference," IEEE Trans. Commun., vol. 46, No.4, pp. 473-479, April 1998.

[3]G. David Forney, JR. "Maximum-Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference," IEEE Trans. Inform. Theory, vol. IT-18, No. 3, pp. 363-378, May 1972.

[4]Jack H.Winters, "Optimum Combining in Digital Mobile Radio with Cochannel Interference," IEEE Trans. Veh Technol vol. VT-33, No.3, pp 144-155 August 1984.

[5] Jack H.Winters, "The Diversity Gain of Transmit Diversity in Wireless Systems with Rayleigh Fading," IEEE Trans. Veh Technol vol. 47, No.1, pp 119-123 February 1998.

[6] Takeo Ohgane, and Takanori Shimura, Hideichi Sasaoka,"An Implementation of a CMA Adaptive Array for High Speed GMSK Transmission in Mobile Communications," IEEE Trans. Veh Technol vol. 42, pp 282-288 August 1993.