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The accuracy of the harmonic mean approximation (HMA) of the exact end-to-end signal-to-noise ratio (SNR) in multihop amplify-and-forward (AF) relaying systems is analyzed. A lower bound for the exact end-to-end SNR is obtained as a function of the HMA. It is shown that HMA overestimates the exact value but no more than 0.5, regardless of the number of hops and the fading model being used. Then, performance...
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