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Which of the following is the first step in FEC decoding?

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Which of the following is the first step in FEC decoding?

(a) Input bitstream synchronization

(b) Descramble

(c) Decode

(d) Symbol puncturing

I have been asked this question by my college professor while I was bunking the class.

My query is from Digital Architecture Tradeoffs in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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The correct option is (a) Input bitstream synchronization

The best I can explain: The first step in FEC decoding is input bitstream synchronization. It is followed by reversing the effect of symbol puncturing and estimation of transmitted bits. Then the resulting signal is decoded and descrambled.

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