A brief analysis of improved effectiveness and reliability of the third-generation Automatic Link Establishment (ALE) system is presented by comparing the performance with the second generation. And the channel coding theory in the second and third-generation ALE system is also introduced separately. With the channel coding performance simulation results, we conclude that there is an obviously improvement on the third-generation ALE system reliability. That's why the third-generation ALE system adopts (2, 1, 7) convolution code.
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