Capacity and Optimal Resource Allocation for Fading Broadcast Channels
نویسندگان
چکیده
We derive the ergodic (Shannon) capacity region of an M-user broadcast fading 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. It is shown that by allowing dynamic resource allocation, TD, FD and CD without successive decoding have the same ergodic capacity region and optimal CD has a larger one. Optimal resource allocation policies are obtained for these diierent spectrum-sharing techniques. A simple sub-optimal policy is also proposed for TD and CD without successive decoding which results in a rate region quite close to their ergodic capacity region. Numerical results are provided for diierent fading broadcast channels.
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