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Which of the following is not a part of the channel encoder/decoder section in the functional model of software defined radio?

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Which of the following is not a part of the channel encoder/decoder section in the functional model of software defined radio?

(a) RF/Channel access

(b) Source coding

(c) IF processing

(d) Modem

This question was posed to me in final exam.

The doubt is from Essential Function of Software Radio in chapter Software Defined Radio Architecture of Cognitive Radio

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The correct choice is (b) Source coding

For explanation: The channel encoder/decoder section comprises of RF/Channel access, IF processing, and modem. RF/Channel access includes antenna and RF conversion. IF processing stage includes filtering, and frequency translation. Modem is responsible for waveform definition.

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