COMPREHENSIVE OPTIMIZATION OF TELECOMMUNICATION SYSTEM BASED ON MODIFIED PRS GOLD AND RAKE RECEIVERS

Abstract

In designing telecommunication systems, the fundamental task is to ensure a low probability of bit error in signal reception at a given transmitter power. To solve this problem, they try to reduce the channel bandwidth in order to reduce the noise level that inevitably enters the channel from the external environment. In this paper, a telecommunication system (TS) with a wideband signal transmitted in 2 separate antenna channels is proposed and investigated. The system implements code division of channel signals using a modified pseudo-random sequence (PRS) of Gold and optimal signal processing using RAKE receivers. In this case, the minimum channel bandwidth and maximum signal-to-noise ratio are achieved. The main directions of optimization of the TCS based on the studied solutions are based on the formation of new modified Gold sequences with better correlation characteristics and a lower level of cross-correlation to improve the signal quality in communication systems. Quite promising is the approach that covers the development of algorithms for optimizing the operation of RAKE receivers, including adaptive tuning for working with various modified Gold sequences. The study of the efficiency of RAKE reception in combination with modified Gold sequences was carried out to reduce the negative impact of Multipath Propagation. A search for optimization of signal processing algorithms for RAKE receivers was carried out to reduce computational costs and ensure their effective application in real time. In order to synthesize optimal Gold sequences, cross-correlation plots are obtained showing how two realizations of the same Gold sequence (shifted by one element) interact with each other after they have been modulated using BPSK and QPSK. A RAKE receiver with BPSK type signals was simulated. The resulting graphs show signals with delays for each finger of the RAKE receiver, as well as the signal structure obtained as a result of processing the RAKE type receiver.