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A Study on Channel Modeling in Tunnel Scenario Based on Propagation-Graph Theory

A new approach based on conventional propagation graph channel modeling was proposed to haracterize the wireless channel in non-light of sight (NLOS) tunnel scenarios. The scattering points are regarded as several points sets, which are different from the propagation-graph theory, then the transfer probability among sets is introduced to adjust the channel impulse response (CIR) taps. The advantage of the proposed method is that wideband channel coefficients, CIR in delay, antennas' correlation coefficient, angle of arrival (AOA), angle of departure (AOD), channel capacity can be calculated analytically for these environments. The validation of the proposed method is performed by the reasonable distribution of the CIR taps, AOD and AOA. Finally some works are done to investigate the variation of tunnel channel coefficients when tunnel bending angle varies, and channel matrix degradation is adopted to explain it.