Extra-high frequency line-of-sight propagation for future urban communications

S. Khan, Abdul Tawfik, C. Gibbins, Boris Gremont

    Research output: Contribution to journalArticlepeer-review


    Spectrum congestion at conventional microwave frequencies has forced communication system designers to explore and investigate higher and higher frequencies, well into the mil- limeric band. This part of the radio spectrum is currently underutilized and offers a very wide bandwidth and permits higher data rates as well as more channels. This paper presents measurements, analysis and modeling of propagation losses for a 97-GHz line-of-sight terrestrial link. The link was established in an urban environment over a path length of 6.5 km and operated over a period of more than a year. An overview of path geometry, experimental equipment and data acquisition, and data processing is first given. The annual distribution of the measured rain attenuation at 97 GHz is discussed in connection with that of the rainfall rate at the receiving point, and compared with the current ITU-R rain attenuation prediction model. Extensive experimental results on rain fade durations, longterm fade statistics and amplitude scintillations carried out using data recorded from this link are also presented. The experimental results concerning rain attenuation modeling indicate that the agreement between the measured rain attenuation values and those computed on the basis of the ITU-R rain attenuation prediction model is not entirely satisfactory. However, the results presented in this paper are only based on data collected over a period of one year, thus the difference between reported and modeled rain attenuation distributions may be attributed to expected year-to-year variations in rain fall rate and its associated attenuation distributions. Therefore, the experimental results appear to indicate that further research is necessary to fully validate the ITU-R rain attenuation model at higher millimeter wave frequency band over longer period of time. Nevertheless, the experimental results have established a considerable degree of confidence in the feasibility of millimeter wave link systems with short distance and low power requirements.
    Original languageEnglish
    Pages (from-to)3109-3121
    Number of pages13
    JournalIEEE Transactions on Antennas and Propagation
    Issue number11
    Publication statusPublished - Nov 2003


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