Accelerating Resource Allocation for OFDMA Downlink with CNR Variation Over Users


C. Liu, G. Böcherer, R. Mathar,


        This paper addresses the problem of resource allocation for orthogonal
frequency division multiple access (OFDMA) downlink that aims at
minimizing the total transmission power under data transmission
constraints. To accelerate this multiuser resource allocation with small
performance loss, an efficient technique is introduced that provides the
power variation of single-user water-filling when the subcarrier
assignment is changed. Based on this technique, an intelligent resource
allocation method for OFDMA downlink is designed. First, a good starting
point is determined by estimating the cardinality of the set of
subcarriers that will be assigned to each user. Second, the convergence
of the resource allocation is accelerated by reassigning those
subcarriers first, which have the greatest channel-to-noise ratio (CNR)
variation over the users. Compared to previous works, simulations show
that the presented method provides an improved balance between
performance and computational complexity.

BibTEX Reference Entry 

	author = {Chunhui Liu and Georg B{\"o}cherer and Rudolf Mathar},
	title = "Accelerating Resource Allocation for {OFDMA} Downlink with CNR Variation Over Users",
	booktitle = "{IEEE} VTC Spring 2009",
	address = {Barcelona},
	month = Apr,
	year = 2009,
	hsb = hsb910012539,


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