Outdoor Ultra Wideband Propagation Channel Modeling at Vhf/uhf Band
نویسندگان
چکیده
Due to the low power spectral properties of ultra wideband (UWB) signals, the technology is suitable to be used, e.g., in covert military applications. The open literature lacks of UWB radio channel models that are generated for outdoor use. This paper describes the radio channel measurement campaign carried out to increase the knowledge of the UWB propagation mechanisms in typical Finnish forest environment. The channel measurements were carried out in the bands of very high and ultra high (VHF, UHF) frequencies in the band of 230–390 MHz. The fractional bandwidth is more than 20%, which fulfils the FCC requirements given for UWB systems. The paper also describes propagation channel models which have been generated based on measurements. Basic channel parameters, such as mean excess delays, RMS delays and total excess delays, are presented. The results were found to be similar to the results of wideband channel measurements from a similar environment but the delay resolution is much better. For each of the measured links, propagation channel models were generated using a tapped delay line structure. Each of the generated models consists of 20–30 taps. The models include information on the gain, delay and amplitude fading of the tap. The channels were not modelled to the noise level, because the delay resolution of an UWB channel is huge and the models would have consisted of too many taps for simulation purposes.
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