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Capacity of the discrete-time Gaussian channel with intersymbol interference

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2 Author(s)
Hirt, W. ; IBM Zurich Res. Lab., Ruschlikon, Switzerland ; Massey, J.L.

The discrete-time Gaussian channel with intersymbol interference (ISI) where the inputs are subject to a per symbol average-energy constraint is considered. The capacity of this channel is derived by means of a hypothetical channel model called the N-circular Gaussian channel (NCGC), whose capacity is readily derived using the theory of the discrete Fourier transform. The results obtained for the NCGC are used further to prove that, in the limit of increasing block length N, the capacity of the discrete-time Gaussian channel (DTGC) with ISI using a per block average-energy input constraint (N -block DTGC) is indeed also the capacity when using the per symbol average-energy constraint

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Information Theory, IEEE Transactions on  (Volume:34 ,  Issue: 3 )