Research Article
Cross-Layer Optimization for OFDMA System with Imperfect CSIT in Quasi Static Channel
@INPROCEEDINGS{10.1109/CHINACOM.2008.4685123, author={Vincent Kin Nang Lau and Vincent Kin Nang Lau and Wing Kwan Ng and David Shui Wing Hui and Wing Kwan Ng and David Shui Wing Hui and Bin Chen}, title={Cross-Layer Optimization for OFDMA System with Imperfect CSIT in Quasi Static Channel}, proceedings={The Fourth Generation Wireless Communications and Beyond}, publisher={IEEE}, proceedings_a={CHINACOM2008-INDUSTRIAL}, year={2008}, month={11}, keywords={OFDMA slow fading channel outage probability scheduling extreme value theory}, doi={10.1109/CHINACOM.2008.4685123} }- Vincent Kin Nang Lau
Vincent Kin Nang Lau
Wing Kwan Ng
David Shui Wing Hui
Wing Kwan Ng
David Shui Wing Hui
Bin Chen
Year: 2008
Cross-Layer Optimization for OFDMA System with Imperfect CSIT in Quasi Static Channel
CHINACOM2008-INDUSTRIAL
IEEE
DOI: 10.1109/CHINACOM.2008.4685123
Abstract
Asymptotic performance analysis of orthogonal frequency division multiple access (OFDMA) is conducted in this work. We take a cross-layer approach and analyze how the system performance scale with some important parameters such as number of user, CSIT quality and order of diversity. It is well studied that system goodput scale with number of user $K$ in the order of ${cal O}(log log K)$ due to multiuser diversity (emph{system goodput gain}) under perfect CSIT assumption. However, in quasi static fading channels with imperfect CSIT, channel outage happens even if capacity achieving coding is applied at the base station. In this case, cross-layer scheduler can protect the packet by increasing the order of diversity ({em packet outage diversity}) . So, there is a trade-off between system goodput gain and packet outage diversity.
