Chapter 2 is all about identifying the factors which are going to
dominate in the early stages of a digital communications system design. Without a good
understanding of the 'big issues' of bandwidth and noise in dictating data throughput and
modem complexity, the more detailed issues of modulation type, hardware implementation and
performance optimization, covered in the later chapters, will not fit into place.
Most of the discussion centres on the engineering aspects and how they influence system
design however the first section covers issues which fall outside
the control of the engineer, such as regulatory or commercial pressures, yet which
often have a significant part to play in dictating the final engineering solution.
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