eee206_2002_sols - Solutions to EEE206/274 Spring Semester...

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Solutions to EEE206/274 Spring Semester 2001-2002 B.Chambers 1(a)Multiplexing is a technique for sending many signals simultaneously over the same transmission medium, e.g. cable, optical fibre, radio link. Most common forms of multiplexing are FDM, TDM, wavelength division multiplexing and code division multiplexing. An older form is space multiplexing. For FDM students should give a detailed description of the formation of a group of 12 channels, plus an outline of the higher combination hierachy. For TDM, ditto and mention the 30 + 2 architecture - 2 channels for framing etc. For WDM and CDM, less detail expected as these are only mentioned briefly in lectures. (b) (i) Each channel has 4 kHz bandwidth. Hence Nyquist frequency = 8 kHz. Sampling at 1.2 x Nyquist = 1.2 x 8 = 9.6 kHz. Each sample is represented by 6 bits Hence bits / channel / sec = 6 x 9600 For N channels, total bits / sec = N x 6 x 9600 If each pulse fills its time slot, then total bits /sec bandwidth = 12 MHz. But the actual time slots are 2 x the minimum. Hence number of bits / sec = 1/2 the theoretical
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This note was uploaded on 09/25/2008 for the course EEE 206 taught by Professor Langley during the Spring '08 term at University of Sheffield.

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eee206_2002_sols - Solutions to EEE206/274 Spring Semester...

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