Reconfigurable intelligent surface (RIS)-assisted communications have received widespread attention recently, whose channel modeling is the cornerstone for its future practical application. Nevertheless, the RIS-related channel modeling stays at the level of either the theoretical free-space derivation or the end-to-end channel model, yet its general segment channel model applicable to real environment is still rarely reported. In this paper, we formulate a temporal segment channel model for RIS-assisted non-line-of-sight (NLOS) communications, which separates the global channel into three parts, i.e., transmitter (Tx)-RIS, RIS-receiver (Rx), and Tx-Rx. Then we bridge the relationship between the proposed model and the existing models. In addition, we illustrate the Ricean K–factor characteristics of the global channel and the sub-channel in the proposed model. The lower boundary for the Ricean K–factor of sub-channel is also deduced. Two low-complexity estimation algorithms for the Ricean K–factor of sub-channel are proposed, whose accuracy is verified by the measured channel data.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Segment Channel Modeling and Ricean K-Factor Estimation for RIS-Assisted NLOS Communications


    Contributors:
    Sang, Jian (author) / Gao, Boning (author) / Li, Xiao (author) / Tang, Wankai (author) / Jin, Shi (author) / Basar, Ertugrul (author)


    Publication date :

    2024-06-24


    Size :

    5377010 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Improved Estimation of the Ricean K Factor from I/Q Samples

    Baddour, K. E. / Willink, T. J. | IEEE | 2007


    Gaussian Modeling of Spatially Correlated LOS/NLOS Maps for Mobile Communications

    Schwarz, Stefan / Safiulin, Illia / Philosof, Tal et al. | IEEE | 2016


    On the capacity of Ricean channel with multiple transmit antennas

    Lebedev, N. / Diouris, J.-F. / American Institute of Aeronautics and Astronautics et al. | British Library Conference Proceedings | 2001