Digital Communications: Fundamentals and Applications, 3rd Edition

Chapter 12

Spread-Spectrum Techniques

A block diagram is given where an information source is formatted into message symbols as digital inputs - m subscript i, which then enters the source encoding phase as digital input, enters the encrypt phase, then enters the channel encoding phase, and channel symbols are added to the output. The output then passes through the multiplex phase along with the signals from other sources. The output coming out of multiplex phase passes through pulse modulate the phase and becomes digital baseband waveform - g subscript i baseline of t, and then passes through bandpass modulating phase where it comes out as ...