Chapter 8 Multiplexing Many to one/one to many Types of multiplexing

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Presentation transcript:

Chapter 8 Multiplexing Many to one/one to many Types of multiplexing Telephone system

Multiplexing vs. No Multiplexing Figure 8-1 Multiplexing vs. No Multiplexing

Figure 8-2

Frequency Division Multiplexing Useful bandwidth of medium exceeds required bandwidth of channel Each signal is modulated to a different carrier frequency, i.e. three lane highway Carrier frequencies separated by strips of unused bandwidth (guard bands) so signals do not overlap e.g. broadcast radio and Cable TV Channel allocated even if no data

Frequency Division Multiplexing

Figure 8-3 FDM

Figure 8-4 FDM, Time Domain

Multiplexing, Frequency Domain Figure 8-5 Multiplexing, Frequency Domain The bandwidth of the resulting composite signal is more then three time the bandwidth of each input signal: necessary channels plus guard bands.

Demultiplexing, Time Domain Figure 8-6 Demultiplexing, Time Domain The demultiplexer uses a series of band pass filters to decompose constituent component signal

Demultiplexing, Frequency Domain Figure 8-7 Demultiplexing, Frequency Domain

FDM System