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The authors study the rate adaptation of a combined system with Adaptive Modulation and Coding (AMC) and Hybrid ARQ (HARQ) in the presence of Channel Quality Indicator (CQI) errors. An average BLock Error Rate (BLER) is imposed to maintain a target error rate. They formulate a generic average throughput expression that accommodates the possible CQI errors. The generic expression is adapted to different forms according to practical scenarios. According to their results, CQI errors can significantly degrade the average throughput of a pure AMC system, especially for the CQI errors generated by user mobility.
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