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Indoor UHF wave propagation is a hard problem studied for 15 years. Two kinds of methods are usually proposed. The former includes empirical approaches based on a statistical modeling of the propagation behavior. They need a wide set of measurements. The later includes methods so called determinsitic because they exploit a physical model of the wave propagation. The most famous deterministic approaches are based on the geometrical optic modeling leading to ray-tracing based methods. These methods have been widely studied in the field of Indoor propagation. In the opposite, discrete approaches such as FDTD or TLM have been more rarely used for Indoor propagation simulations because of their high computational load. |
| We have developed a new approach based on a TLM like formalism in the frequency domain, and exploiting a multi-resolution decomposition of the environment. Such a decomposition allows to reach very fast computational times when compared to the original time-domain approach. Typically, a dense radio coverage of a N.N pixels is solved in O(log2(N).N2), thus with a complexity comparable to those of a standard multi-wall model (MWM) approach exploiting only direct paths. It should be emphasized that in our approach all paths are taken into account. Such a low computational complexity is reached taking advantage of the multi-resolution tree computed during a pre-processing phase having a complexity in O(N3). |
| Calibrated simulation results have been compared to experimental measurements. they exhibit a mean quadratic error of about 5dB only. |
