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Bounds on ε-rate for linear, time-invariant, multiinput/multioutput channels

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2 Author(s)
Hajela, D. ; Bellcore, Morristown, NJ, USA ; Honig, M.L.

Upper and lower bounds on the ε-rate of a linear, time-invariant multiple input multiple output channel are derived by using the same volume argument previously used by W.L. Root (1968) for single input single output channels. Because these bounds are not very tight, an approximation to the ε-rate is presented which lies between the upper and lower bounds, and can be used to compare ε-rates for different channels. The extension considered uses a result due to Lerer (1978) on the eigenvalue distribution of a convolution operator with a matrix kernel (impulse response). The present results are used to assess the increase in data rate attainable by designing input signals which exploit the multidimensional nature of the channel, relative to treating each constituent channel in isolation. Numerical results based upon a simple model for two coupled twisted-pair wires are presented

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Information Theory, IEEE Transactions on  (Volume:36 ,  Issue: 5 )