A Sum-Product Model as a Physical Basis for Shadow Fading
<|reference_start|>A Sum-Product Model as a Physical Basis for Shadow Fading: Shadow fading (slow fading) effects play a central role in mobile communication system design and analysis. Experimental evidence indicates that shadow fading exhibits log-normal power distribution almost universally, and yet it is still not well understood what causes this. In this paper, we propose a versatile sum-product signal model as a physical basis for shadow fading. Simulation results imply that the proposed model results in log-normally distributed local mean power regardless of the distributions of the interactions in the radio channel, and hence it is capable of explaining the log-normality in a wide variety of propagation scenarios. The sum-product model also includes as its special cases the conventional product model as well as the recently proposed sum model, and improves upon these by: a) being applicable in both global and local distance scales; b) being more plausible from physical point of view; c) providing better goodness-of-fit to log-normal distribution than either of these models.<|reference_end|>
@article{salo2007a,
    title={A Sum-Product Model as a Physical Basis for Shadow Fading},
    author={Jari Salo},
    journal={arXiv preprint arXiv:cs/0702098},
    year={2007},
    archivePrefix={arXiv},
    eprint={cs/0702098},
    primaryClass={cs.OH}
}