V.P. Fedosov1, Jaleel Sadoon Jameel2, S.V. Kucheryavenko3

1-3 Institute for Radiotechnical Systems and Control, Southern Federal University (Rostov-on-Don, Russia)

For modern communication systems, the demand for fast and easy ways to transfer and exchange information in real time is a fundamental requirement. To exploit the potential of spectral efficiency and solve performance problems, several efficient communication methods have been developed for use in multipath or multipath propagation. The traditionally used technologies of SISO (Single Input Single Output - one receiver one transmitter) antenna systems are being actively replaced by MIMO (Multiple Input Multiple Output) antenna array systems with the simultaneous use of the OFDM (Orthogonal frequency-division multiplexing) frequency modulation algorithm in conditions multipath signal propagation. It seems appropriate to compare both systems for noise immunity with adaptive reception using the MMSE (Minimum mean square error) algorithm. The basis of the MMSE algorithm is the analysis of the minimum mean square error of signal determination at the receiver output. The adaptive MMSE algorithm is designed with low complexity, robust to both slow and fast channel fading situations. A method for transmitting an image over a wireless 3D channel in a WiMAX (Worldwide Interoperability for Microwave Access) network is considered. The goal is to develop a spectrally efficient system that provides minimal transmission errors and good visual image quality in multipath signal propagation in an urban environment. The task of the study consists of applying the path selection criterion for multipath signal propagation in urban environments, developing an adaptive modulation algorithm for image transmission in wireless communication, developing a three-dimensional channel model for image transmission in wireless communication, analyzing the root-mean-square error of image transmission using the proposed algorithms, processing images using the proposed algorithms. The implementation of the adaptive MMSE receiver algorithm in MIMO OFDM systems combines the adaptive algorithm with a multi-user receiver scheme with minimum mean square error, channel advance information and spatial interference cancellation, and improves joint channel estimation and signal detection, which makes this receiving system efficient. In this study, the information transmission capacity of MMSE and OFDM receivers was evaluated based on mathematical calculations and simulation results. The throughput results obtained show that in both single and multi-carrier methods, in addition to different implementations, the achievable criteria for the throughput of the traffic channel are essentially identical. It can also be concluded that the use of adaptive algorithms with MMSE has a positive effect on noise immunity in signal processing in the receiving system under conditions of multipath signal propagation.

Fedosov V.P., Jaleel Sadoon Jameel, Kucheryavenko S.V. Comparison of performance of adaptive algorithm with MMSE methods
for image transmission based on MIMO and SISO systems. Radiotekhnika. 2022. V. 87. № 2. P. 123−135.
DOI: https://doi.org/10.18127/j00338486-202302-15 (In Russian)

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