Efficient Power Allocation for OFDM with Imperfect Channel State Information


C. Liu, A. Schmeink, R. Mathar,


        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.

BibTEX Reference Entry 

	author = {Chunhui Liu and Anke Schmeink and Rudolf Mathar},
	title = "Efficient Power Allocation for {OFDM} with Imperfect Channel State Information",
	booktitle = "{IEEE} WiCOM 2009",
	address = {Beijing, China},
	month = Sep,
	year = 2009,
	hsb = hsb910012495,


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