加性高斯白噪声信道的最佳接收机设计与仿真

加性高斯白噪声信道的最佳接收机设计与仿真

摘要

在数字通信系统中，在接收机端接收的信号往往受加性高斯白噪声信号的恶化，因此研究加性高斯白噪声信道的最佳接收机具有一定的实用性意义。最佳接收机主要由信号解调器和检测器组成，信号解调器有相关解调器和匹配滤波器解调器两种实现方法，检测器主要由最大后验概率准则和最大似然准则两大准则。

本设计主要对4PSK调制方式的信号，利用MATLAB的m文件进行最佳接收机的设计与仿真。对输入的叠加噪声的4PSK调制信号进行接收，利用相关解调器来实现信号解

cos和调，及最大似然准则来实现检测器。在相关解调器中，接收信号分别与基函数()tω()tω

sin相乘再积分。在检测器中，利用相位来判断输出，从而最终得到接收的数据。采用随机二进制数通过4PSK调制后叠加高斯白噪声再对设计的接收机进行测试，从测试的结果可看出，在信噪比大于-8dB时，误码率为0，说明该接收机较好的实现了抗噪声性能。

关键词信号解调器；检测器；四进制相移键控；信噪比；误码率

Design and Simulation Of Optimum Receiver in Additive

Gaussian White Noise Channel

ABSRACT

In the digital communication system, the received signal is often deteriorated by additive Gaussian white noise signal at the receiver side. Therefore, researched Optimum Receiver in Additive Gaussian White Noise Channel has a certain practicality best significance. Optimum receiver contain signals demodulator and detector, However, the signal demodulation has two methods of the related demodulator and the match filter demodulator , the detector by the MAP and ML for two major principles composition.

The design mainly design and simulation optimum receiver use of MATLAB m-files based on 4PSK signal modulation.Superposition of noise on the input signals received 4PSK modulation, use of relevant signal demodulation demodulator and ML principles detection to achieve. In the relevant demodulator, the received signal, respectively multiplying the base functions and then integration. The detector, the use of phase to determine the output, and ultimately obtain the receiving data. Adopted random binary pass through 4PSK modulate that Superposition of Gaussian white noise, then Tested the design of the receiver. the results can be seen from the test, the error rate is 0 when the signal to noise ratio is greater than -8dB, indicating that the receiver is more Achieve good noise performance.

Key words: demodulator;detector;4PSK;signal-noise; error rate

目录

1绪论 (1)

1.1课题背景及目的 (1)

1.2国内外发展状况 (1)

1.3论文构成及研究内容 (2)

2 AGWN最佳接收机的原理 (3)

2.1 受加性高斯白噪声恶化信号的最佳接收机 (3)

2.2最佳解调器 (3)

2.2.1相关解调器 (4)

2.2.2匹配滤波器解调 (5)

2.3最佳检测器 (7)

3 4PSK最佳接收机的设计 (9)

3.1 4PSK的最佳接收机工作原理 (9)

3.2 4PSK的最佳接收机的功能 (10)

3.3 4PSK的最佳接收机设计的流程图 (10)

3.4 4PSK的最佳接收机的仿真 (12)

4测试结果及性能分析 (14)

4.1测试数据的生成 (14)

4.2测试的结果及分析 (15)

5总结 (21)

参考文献 (22)

致谢 (23)

附录 (24)

附件1开题报告 .........................................................................................错误!未定义书签。附件2英文原文及译文 . (37)