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Noise, interfering signals performance simulation PM

In Electronic Infomation Category: N | on April 18,2011

Abstract: The noise for the noise in the study phase modulation interference signals, interference signals by analyzing the noise performance of PM and AT-230 datasheet and its direct sequence spread spectrum communication system, the establishment of the jamming interference signal modulation system and AT-230 price and the noise simulation model. According to the simulation of bit error rate of the system obtained curves of different frequencies and AT-230 suppliers and different interference noise interference modulation bandwidth interference signals on the interference effect of DS systems, and draw a valid conclusion.

0 Introduction

Noise is an amplitude, frequency, phase change random and irregular electromagnetic wave signals, including pure noise and various noise modulation interference, because they work under a variety of communication systems will have a significant interference effect, it is the most important one disturbances. The following main noise for the noise phase modulation interference signals in the study, analysis of direct sequence spread spectrum communication system, the simulation under different moderating effect of interference parameters.

1 the basic principles of noise interference signals PM

Sense stationary process is random noise disturbance PM:


Type, the modulation noise u (t) with zero mean; variance 2n generalized stationary random process; to [0, 2] uniform distribution, and with the u (t) independent random variables; Uj for noise phase modulation amplitude; j is a constant, the center frequency of the noise phase modulation; K PM is a constant. Can be derived by the J (t) of the mean:


Correlation function:


When D "1, the noise signal power spectrum phase modulation:


Noise phase modulation signal power is:


Its bandwidth:


When D "1, the noise signal power spectrum phase modulation:


Noise phase modulation signal power is:


Its bandwidth:


2 Simulation Model

Interference by analyzing the mathematical model of the noise phase modulation, the use of Matlab Simulink in system simulation platform to create a computer simulation model of interference, as shown in Figure 1, the transmitter sends the DS signal reaches the receiver through the channel, and the bit error rate test to analyze the system performance.


Figure 1 interference model

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