Communication Systems
Circular polarization

Is useful in discrimination between reception of adjacent beams
None of these
Is useful in reducing depolarization effect on received wave
Involves critical alignment of transmitting and receiving antenna

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Communication Systems
In Pulse Code Modulation system

Suffers from the disadvantage of its incompatibly with TDM
Quantising noise can be overcome by companding
Quantising noise can be reduced by decreasing the number of standard levels
Large bandwidth is required

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