TY - GEN

T1 - Multiuser water-filling

AU - Cheng, Roger S.

AU - Verdu, Sergio

PY - 1993

Y1 - 1993

N2 - We find the capacity region of a two-user Gaussian multiaccess channel with intersymbol interference (ISI) where the inputs pass through respective linear systems and are then superimposed before being corrupted by an additive Gaussian noise process. We give a novel geometrical method to obtain the optimal input power spectral densities and the capacity region. This method can be viewed as a nontrivial generalization of the single-user water-filling argument. We show that as in the traditional memoryless multiaccess channel, FDMA, with optimally selected frequency bands for each user, achieves the total capacity of the K-user Gaussian multiaccess channel with ISI. However, the capacity region of the two-user channel with memory is, in general, not a pentagon unless the channel transfer functions for both users are identical.

AB - We find the capacity region of a two-user Gaussian multiaccess channel with intersymbol interference (ISI) where the inputs pass through respective linear systems and are then superimposed before being corrupted by an additive Gaussian noise process. We give a novel geometrical method to obtain the optimal input power spectral densities and the capacity region. This method can be viewed as a nontrivial generalization of the single-user water-filling argument. We show that as in the traditional memoryless multiaccess channel, FDMA, with optimally selected frequency bands for each user, achieves the total capacity of the K-user Gaussian multiaccess channel with ISI. However, the capacity region of the two-user channel with memory is, in general, not a pentagon unless the channel transfer functions for both users are identical.

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M3 - Conference contribution

AN - SCOPUS:0027167283

SN - 0780308786

T3 - Proceedings of the 1993 IEEE International Symposium on Information Theory

SP - 209

BT - Proceedings of the 1993 IEEE International Symposium on Information Theory

PB - Publ by IEEE

T2 - Proceedings of the 1993 IEEE International Symposium on Information Theory

Y2 - 17 January 1993 through 22 January 1993

ER -