ESTIMATION OF BIT ERROR PROBABILITIES OF COMMUNICATION SYSTEMS WITH FM BROADBAND SIGNALS

Abstract

Today, wireless communication is one of the most promising areas in the field of communications. Modern radio communication systems and facilities operate in a complex electronic environment. The development of next-generation wireless networks depends on both transmitting and receiving equipment, which must provide the high data rates needed to maintain a reliable level of interference protection. The main factors influencing the quality of radio communication are natural and intentional interference in the radio wave propagation channel, multi-beam propagation, bandwidth limitation and the need for asynchronous access. One of the possible methods of partial solution of the above problems is the use of extended spectrum communication systems. The article investigates the effectiveness of different types of phase modulation used for Direct Sequence Spread Spectrum systems. An idealized channel with additive white Gaussian noise was chosen as the radio wave propagation channel. It has been observed that Binary phase shift keying radio systems achieve better Bit error rate values than other systems. The research was conducted in the environment of dynamic interdisciplinary modeling of complex technical systems - Simulink (the main tool for model-oriented design), whose main interface is a graphical tool for charting and a flexible set of libraries of functional blocks. The simulation results showed that for a given data rate and under the influence of AWGN on the propagation channel, DSSS-BPSK was more resistant to the negative effects of white noise. Future research will focus on evaluating the effectiveness of the SSS communication system in the event of different types of interference.