The pre-log of Gaussian broadcast with feedback can be two

A generic intuition says that the pre-log, or multiplexing gain, cannot be larger than the minimum of the number of transmit and receive dimensions. This suggests that for the scalar broadcast channel, the pre-log cannot exceed one. By contrast, in this note, we show that when the noises are anticorrelated and feedback is present, then a pre-log of two can be attained. In other words, in this special case, in the limit of high SNR, the scalar Gaussian broadcast channel turns into two parallel AWGN channels. Achievability is established via a coding strategy due to Schalkwijk, Kailath, and Ozarow.


Published in:
2008 Ieee International Symposium On Information Theory Proceedings, Vols 1-6, 1258-1262
Presented at:
IEEE International Symposium on Information Theory, Toronto, CANADA, Jul 06-11, 2008
Year:
2008
Publisher:
Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa
ISBN:
978-1-4244-2256-2
Keywords:
Laboratories:




 Record created 2011-10-17, last modified 2018-09-13


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