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Link performance abstraction with simplified models that accurately capture the decoded receiver performance under fading channels has several applications. Such models help a receiver estimate a channel and map them to a performance metric, which allows it to select and recommend a preferred mode of transmission. In addition, these models capture the short term performance characteristics of link layer which can be used in system level studies. Mutual information metrics based on bit channels have been shown to give good performance prediction. In this paper, this approach is generalized by considering conditional PDFs of Log-Likelihood Ratios (LLRs) of these bit channels.
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