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| ==== abstract ==== | ==== abstract ==== | ||
| It will be explained how a correlation inequality of | It will be explained how a correlation inequality of | ||
| + | statistical mechanics can | ||
| + | be applied to the theory of low density parity check codes. Two | ||
| + | applications will be considered. | ||
| + | |||
| + | The first one yields a proof that the growth rate can be computed | ||
| + | exactly by iterative methods | ||
| + | at least on the interval where it is concave. The second concerns sharp | ||
| + | bounds for the | ||
| + | "generalised EXIT curve" in the case of communication through a noisy | ||
| + | gaussian channel. | ||