Efficient power allocation for OFDM with imperfect channel state information

Authors:
Chunhui Liu;Anke Schmeink;Rudolf Mathar
Affiliations:
Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany;UMIC Research Centre, RWTH Aachen University, Aachen, Germany;Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

Citing 4
Cited 0

Elements of information theory

Elements of information theory
Orthogonal Frequency Division Multiplexing for Wireless Communications (Signals and Communication Technology)

Orthogonal Frequency Division Multiplexing for Wireless Communications (Signals and Communication Technology)
Rate-maximizing power allocation in OFDM based on partial channel knowledge

IEEE Transactions on Wireless Communications
Adaptive OFDM Systems With Imperfect Channel State Information

IEEE Transactions on Wireless Communications

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Abstract

This paper studies the effect of the imperfect channel state information (CSI) on the performance of adaptive orthogonal frequency division multiplexing (OFDM) systems. To perform resource allocation, CSI must be fed back to the transmitter. Such feedback CSI is always imperfect due to the time-varying channel, the noisy channel estimation and the limited feedback. First, we analyze the imperfection of the feedback CSI from these three aspects. Then, we propose an efficient method to perform power allocation, where Jensen's inequality is used to approximate the objective of the power allocation in order to enhance the computational efficiency. Simulations show that performance loss due to the CSI imperfection and this approximation is very small for a proper frame length.