By R C V Macario
An educational advent to cellullar radio, delivering a uncomplicated assessment of either analog and electronic structures. desk of Contents: Radio insurance Prediction; mobile Radio layout rules; Analog mobile Radio Signalling; Multipath Propagation difficulties; Modulation recommendations; Speech techniques; electronic mobile Designs; Spectral potency concerns. 142 illustrations.
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Additional resources for Cellular Radio: Principles and Design
2. 2 Open transmission line forming a half wave dipole If the top section is mounted above a conducting surface, a monopole antenna is formed. This need only have one quarter of a wavelength in physical height. 3 em. 3 shows the situation at the base of the antenna (the centre of the equivalent dipole). 3 The roof mounted IJ4 monopole antenna. Extra effective height and gain can be obtained by a loading coil Radio Coverage Prediction 41 The roof mounted monopole (half a dipole) is the best known example.
Where a number of errors occur closely together, separated by a large guard-space (or error-free zone). Such an error distribution arises from impulse noise and there is a dependence of error probabilities in successively transmitted bits. Under block codes, the Reed-Solomon and Golay codes have both burst and random error-correcting abilities; the former treats non-binary data, whereas the latter handles only binary data. The Reed-Solomon code is a special sub-class of the Bose-Chaudhuri-Hocquenghem (BCH) code, with powerful applications for correcting multiple bursts of errors in a frame.
Because digital cellular technology is much more closed tuned to the modem digital fixed telephone technology, a fuller description of the fixed network in support of mobile phones is deferred until Chapter 9. 10 Error correction strategies It is widely recognized that in practice mobile radio signals in any radio band, but more specifically at VHF and UHF, are always subject to variable received amplitude, changing phase and indeed spectrum widening due to a propagation induced frequency modulation.