Capacity and optimal resource allocation for fading broadcastchannels .I. Ergodic capacity
Lifang Li; Goldsmith, A.J.
Information Theory, IEEE Transactions on
Volume 47, Issue 3, Mar 2001 Page(s):1083 - 1102
Digital Object Identifier 10.1109/18.915665
Summary:In multiuser wireless systems, dynamic resource allocation between
users and over time significantly improves efficiency and performance.
In this two-part paper, we study three types of capacity regions for
fading broadcast channels and obtain their corresponding optimal
resource allocation strategies: the ergodic (Shannon) capacity region,
the zero-outage capacity region, and the outage capacity region with
nonzero outage. We derive the ergodic capacity region of an M-user
fading broadcast channel for code division (CD), time division (TD), and
frequency division (FD), assuming that both the transmitter and the
receivers have perfect channel side information (CSI). It is shown that
by allowing dynamic resource allocation, TD, FD, and CD without
successive decoding have the same ergodic capacity region, while optimal
CD has a larger region. Optimal resource allocation policies are
obtained for these different spectrum-sharing techniques. A simple
suboptimal policy is also proposed for TD and CD without successive
decoding that results in a rate region quite close to the ergodic
capacity region. Numerical results are provided for different fading
broadcast channels
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