منابع مشابه
ITU-R Standardization Activities on Cognitive Radio
SUMMARY Cognitive radio is an emerging technology to further improve the efficiency of spectrum use. Due to the nature of the technology, it has many facets, including its enabling technologies, its implementation issues and its regulatory implications. In ITU-R (International Telecommunications Union — Radiocommunication sector), cognitive radio systems are currently being studied so that ITU-...
متن کاملRadio Halos in future surveys in the radio continuum
Aims. Giant radio halos are mega-parsec scale synchrotron sources detected in a significant fraction of massive and merging galaxy clusters. Radio halos provide one of the most important pieces of evidence of non-thermal components in large-scale structure. Their statistical properties can be used to discriminate among various models for their origin. Therefore, theoretical predictions of the o...
متن کاملIEEE Contribution to ITU-R on "Radio interface specifications for fixed broadband wireless access (BWA) systems",
This standard specifies the air interface of fixed (stationary) point-to-multipoint broadband wireless access systems providing multiple services. The medium access control layer is capable of supporting multiple physical layer specifications optimized for the frequency bands of application. The standard includes a particular physical layer specification applicable to systems operating between ...
متن کاملRECOMMENDATION ITU-R RA.769-2 - Protection criteria used for radio astronomical measurements
a) that many of the most fundamental astronomical advances made in the past five decades, (e.g. the discovery of radio galaxies, quasars, and pulsars, the direct measurement of neutral hydrogen, the direct measurement of distances of certain external galaxies, and establishment of a positional reference frame accurate to ∼20 arc μs) have been made through radio astronomy, and that radio astrono...
متن کاملEvaluation of Radio over Sea Propagation Based ITU-R Recommendation P.1546-5
—The propagation prediction research has mainly focused on studying the radio propagation models in urban or rural land areas. In this paper, we extend a method for 950 MHz propagation prediction over sea based ITU-R Recommendation P.1546-5. A gauge of the accuracy of the prediction Free Space model, correction Okumura-Hata model and the P.1546-5 model is presented. The P.1546-5 is evaluated u...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: IEEE Transactions on Electromagnetic Compatibility
سال: 1981
ISSN: 0018-9375
DOI: 10.1109/temc.1981.303974