Communications

Download Mobile Communications Handbook by Gibson J.D. (ed.), Dorf R.C. (ed.) PDF

By Gibson J.D. (ed.), Dorf R.C. (ed.)

In one quantity, The cellular Communications guide covers the full box, from ideas of analog and electronic communications to cordless phones, instant neighborhood region networks (LANs), and foreign expertise criteria. the superb scope of the guide guarantees that it'll be the first reference for each element of cellular communications.

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Baseband Signalling and Pulse Shaping” Mobile Communications Handbook Ed. Suthan S. 7 Michael L. S. Digital Cellular (IS-136) • Interim Standard-95 • Personal Access Communications System (PACS) Defining Terms References Further Information Many physical communications channels, such as radio channels, accept a continuous-time waveform as input. Consequently, a sequence of source bits, representing data or a digitized analog signal, must be converted to a continuous-time waveform at the transmitter.

Prentice Hall, Upper Saddle River, NJ, p. 140. With permission. 3 Percent Quantizing Noise The quantizer at the PCM encoder produces an error signal at the PCM decoder output as illustrated in Fig. 2c. The peak value of this error signal may be expressed as a percentage of the maximum possible analog signal amplitude. Referring to Fig. 2c, a peak error of 1 V occurs for a maximum analog signal amplitude of M = 8 V as shown Fig. 1c. 1) P where P is the peak percentage error for a PCM system that uses n bit code words.

It is up to the system designer to specify the exact code word that will represent a particular quantized level. 1 is used, the resulting PCM signal is shown in Fig. 2d where the PCM word for each quantized sample is strobed out of the encoder by the next clock pulse. The Gray code was chosen because it has only 1-b change for each step change in the quantized level. Consequently, single errors in the received PCM code word will cause minimum errors in the recovered analog level, provided that the sign bit is not in error.

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