From fe9d3017f71341ca8c253e136751ebe0a6f2008e Mon Sep 17 00:00:00 2001 From: Marco Miozzo Date: Tue, 19 Jul 2011 13:27:19 +0200 Subject: [PATCH] Update pathloss doc with ITU formulas of WCDMA sim --- src/lte/doc/source/lte-pathloss-model.rst | 10 ++++++---- src/lte/doc/source/lte-references.rst | 4 ++++ 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/src/lte/doc/source/lte-pathloss-model.rst b/src/lte/doc/source/lte-pathloss-model.rst index ad3f5ef92..0fe6f5f15 100644 --- a/src/lte/doc/source/lte-pathloss-model.rst +++ b/src/lte/doc/source/lte-pathloss-model.rst @@ -166,7 +166,7 @@ The value used by the simulator is the average one for modelling the median path NLoS over the rooftops ~~~~~~~~~~~~~~~~~~~~~~ -In this case the loss is expressed as the sum of free-space loss (:math:`L_{bf}`), the diffraction loss from rooftop to street (:math:`L_{rts}`) and the reduction due to multiple screen diffraction past rows of building (:math:`L_{msd}`). The formula is: +In this case the model is based on [walfisch]_ [ikegami]_ loss is expressed as the sum of free-space loss (:math:`L_{bf}`), the diffraction loss from rooftop to street (:math:`L_{rts}`) and the reduction due to multiple screen diffraction past rows of building (:math:`L_{msd}`). The formula is: .. math:: @@ -222,7 +222,8 @@ Therefore, in case of :math:`l > d_s` (where `l` is the distance over which the L_{bsh} = \left\{ \begin{array}{ll} -18\log{(1+\Delta h_{b})} & \mbox{for } h_{b} > h_{r} \\ 0 & \mbox{for } h_{b} \le h_{hr} \end{array}\right. k_a = \left\{ \begin{array}{lll} - 54 & \mbox{for } h_{b} > h_{r} \\ + 71.4 & \mbox{for } h_{b} > h_{r} \mbox{ and } f>2000 \mbox{ MHz} \\ + 54 & \mbox{for } h_{b} > h_{r} \mbox{ and } f\le2000 \mbox{ MHz} \\ 54-0.8\Delta h_b & \mbox{for } h_{b} \le h_{r} \mbox{ and } d \ge 500 \mbox{ m} \\ 54-1.6\Delta h_b & \mbox{for } h_{b} \le h_{r} \mbox{ and } d < 500 \mbox{ m} \\ \end{array} \right. @@ -233,8 +234,9 @@ Therefore, in case of :math:`l > d_s` (where `l` is the distance over which the \end{array} \right. k_f = \left\{ \begin{array}{ll} - 0.7(f/925 -1) & \mbox{for medium city and suburban centres} \\ - 1.5(f/925 -1) & \mbox{for metropolitan centres} + -8 & \mbox{for } f>2000 \mbox{ MHz} \\ + -4 + 0.7(f/925 -1) & \mbox{for medium city and suburban centres and} f\le2000 \mbox{ MHz} \\ + -4 + 1.5(f/925 -1) & \mbox{for metropolitan centres and } f\le2000 \mbox{ MHz} \end{array}\right. diff --git a/src/lte/doc/source/lte-references.rst b/src/lte/doc/source/lte-references.rst index a20e1ee4c..c530f4832 100644 --- a/src/lte/doc/source/lte-references.rst +++ b/src/lte/doc/source/lte-references.rst @@ -45,3 +45,7 @@ .. [turkmani] Turkmani A.M.D., J.D. Parson and D.G. Lewis, "Radio propagation into buildings at 441, 900 and 1400 MHz", in Proc. of 4th Int. Conference on Land Mobile Radio, 1987. + +.. [walfisch] J.Walfisch and H.L. Bertoni, "A Theoretical model of UHF propagation in urban environments," in IEEE Trans. Antennas Propagat., vol.36, 1988, pp.1788- 1796 + +.. [ikegami] F.Ikegami, T.Takeuchi, and S.Yoshida, "Theoretical prediction of mean field strength for Urban Mobile Radio", in IEEE Trans. Antennas Propagat., Vol.39, No.3, 1991