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Introduction to Digital Data Transmission

1 Introduction to Digital Data INTRODUCTIONThis book is concerned with the Transmission of information by electrical means usingdigital communication techniques. Information may be transmitted from one point to an-other using either Digital or analog communication systems. In a Digital communicationsystem, the information is processed so that it can be represented by a sequence of dis-crete messages as shown in Figure 1 1. The Digital source in Figure 1 1 may be the resultof sampling and quantizing an analog source such as speech, or it may represent a natu-rally Digital source such as an electronic mail file.

Power amplification (power limitation) Spreading code generator Waveform channel (bandwidth limitation) Timing and synchro-nization Noise Discrete (memoryless) channel Source rate: R m 1 T m log 2 q bits second output bits input bits R FIGURE 1–3 Block diagram of a typical digital communication system.

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