TY - JOUR
T1 - Capacity and optimal resource allocation for fading broadcast channels-Part I
T2 - Ergodic capacity
AU - Li, Lifang
AU - Goldsmith, Andrea J.
N1 - Funding Information:
Manuscript received February 11, 1999; revised April 29, 2000. This work was supported by NSF Career Award NCR-9501452 and under a grant from Pacific Bell, while L. Li pursued the Ph.D. degree under the supervision of A. J. Goldsmith at the California Institute of Technology, Pasadena, CA 91125 USA. The material in this paper was presented in part at the 36th Allerton Conference on Communication, Control, and Computing, Monticello, IL, September 1998.
PY - 2001/3
Y1 - 2001/3
N2 - 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. In Part I, 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. In Part II, we obtain analogous results for the zero-outage capacity region and the outage capacity region.
AB - 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. In Part I, 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. In Part II, we obtain analogous results for the zero-outage capacity region and the outage capacity region.
KW - Broadcast channels
KW - Capacity region
KW - Fading channels
KW - Optimal resource allocation
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U2 - 10.1109/18.915665
DO - 10.1109/18.915665
M3 - Article
AN - SCOPUS:0035270116
SN - 0018-9448
VL - 47
SP - 1083
EP - 1102
JO - IEEE Transactions on Information Theory
JF - IEEE Transactions on Information Theory
IS - 3
ER -