Question

Hybrid automatic repeat request is a combination of

(a) ARQ and error correction code

(b) ARQ and error detection code

(c) Error detection and correction codes

(d) One of the mentioned

I have been asked this question in final exam.

This intriguing question originated from Link Budget Analysis and Error Control topic in chapter Communication Link Analysis of Digital Communications

Answer 1

The correct choice is (a) ARQ and error correction code

To explain: An alternate approach for error control is a hybrid automatic repeat request method which is a combination of ARQ and error correction code.