By R C V Macario
An educational advent to cellullar radio, supplying a simple review of either analog and electronic platforms. desk of Contents: Radio assurance Prediction; mobile Radio layout rules; Analog mobile Radio Signalling; Multipath Propagation difficulties; Modulation innovations; Speech suggestions; electronic mobile Designs; Spectral potency concerns. 142 illustrations.
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Extra resources for Cellular Radio: Principles and Design
Bm per Hz .. 5 shows how much the actual system noise level is above N 0 ; either as a noise figure Fa' or as a noise temperature T a' relative to the reference noise temperature T 0 • The data are then independent of the receiver bandwidth. Note that at UHF, receiver circuit noise and external site noise are comparable; together they limit the maximum cell size 1\nax· 3xl08 60 3x107 so .!! 3x 10' -5 i 3xto' lila ~ 3x104 .!!
1990). Y. (1989). Mobile Cellular Communications Systems, McGraw-Hill Book Co, NY Young, W. R. (1979). , 58, pp 1-41 Some recent textbooks dealing with cellular radio Balston, D M. V. (1993). Cellular Radio Systems, Artech House. Gardiner, J. and West, B. (1995). Personal Communications Systems and Technologies, Artech House. Gibson, D. (Ed) (1996). The Mobile Communication Handbook, CRC Press, in co-operation with IEEE. Y. (1992). Mobile Communications Design Fundamentals, Second Edition, Wiley.
The error rate can be improved to 1 in 10,000. However, only when the pure data channel is relatively free of errors, can any significant reduction in the ratio Eb /N0 be made. In all cases, however, FEC introduces the penalty of a slower throughput of data. Finally, a strategy called interleaving may be used. Because the signal over a mobile radio path can very often fade briefly, some data could be entirely lost. ARQ is not practical, but if a strategy of 'reshuftling' the data stream temporarily is employed - called interleaving - it is then possible to recover critical parts, especially with regard to the speech coding algorithm, by this means.