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The authors' main goal in this paper is to construct codes that can perform close to information-theoretic limits in time-varying channels. For this purpose, a new turbo-like code is first proposed for the block-fading channel which achieves the same error performance of a recently introduced blockwise concatenated code but with a lower complexity. The effectiveness of the codes is verified by comparing them with information-outage probability. In order to take the advantage of time diversity in time-varying fading channels, they introduce two new codes which are indeed extensions of the ones for block-fading channels. They report that error performance of the proposed codes is close to information-theoretic limits in time-varying channels set out by information-outage probability.
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