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Performance Improvement on Adaptive OFDM System with a Multi-Step Channel Predictor over Mobile Fading Channels  

Ahn, Hyun-Jun (포스데이타)
Kim, Hyun-Dong (가톨릭대학교 일반대학원 컴퓨터공학과)
Choe, Sang-Ho (가톨릭대학교 정보통신 전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.12A, 2006 , pp. 1182-1188 More about this Journal
Abstract
Adaptive OFDM(Orthogonal Frequency Division Multiplexing) improves data capacity and system performance over multipath fading by adaptively changing modulation schemes according to channel state information(CSI). To achieve a good performance in adaptive OFDM systems, CSI should be transmitted from receiver to transmitter in real time through feedback channel. However, practically, the CSI feedback delay d which is the sum of the data processing delay and the propagation delay is not negligible and damages to the reliability of CSI such that the performance of adaptive OFDM is degraded. This paper presents an adaptive OFDM system with a multistep predictor on the frequency axis to effectively compensate the multiple feedback delays $d(\geq2)$. Via computer simulation we compare the proposed scheme and existing adaptive OFDM schemes with respect to data capacity and system performance.
Keywords
Adaptive OFDM; CSI; Multi-step prediction;
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Times Cited By KSCI : 1  (Citation Analysis)
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