Investigation of the noise immunity of signal-code constructions in various channel models

The increasing demands for throughput and reliability in modern wireless communication systems necessitate effective methods of error-control coding and multi-level modulation. Signal-code constructions, particularly trellis-coded modulation and bit-interleaved coded modulation, are fundamental approaches for solving this task. This paper presents an analysis of the performance and quality of the specified constructions, carried out through simulation in the MATLAB environment. The study covers a wide spectrum of channel models: from the additive white Gaussian noise channel to channels with Rayleigh and Rician fading, featuring both flat and frequency-selective characteristics. In the context of analyzing signal-code constructions of the bit-interleaved coded modulation type, the role and quantitative effectiveness of various interleaver types are investigated in detail. The obtained results not only define the performance limits of each scheme but also form a basis for the future development of methods for their improvement. The simulation results show the high efficiency of both types of signal-code constructions in the flat Rician channel and, furthermore, confirm the key role and performance differences of interleavers in enhancing overall noise immunity under channel fading conditions.

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