NDLI: Fast Resource Allocation for OFDMA Downlink Utilizing An Efficient Bit Loading

Content Provider	IEEE Xplore Digital Library
Author	Chunhui Liu Mathar, R. Reyer, M.
Copyright Year	2008
Description	Author affiliation: Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen (Chunhui Liu; Mathar, R.; Reyer, M.)
Abstract	In this paper, bit loading for orthogonal frequency division multiplexing (OFDM) is studied first. The continuous water-filling is modified to take the maximal rate constraint on each subcarrier into account. Its continuous outputs are optimally quantized by a non-iterative algorithm. By iteratively utilizing bit loading for OFDM, a class of resource allocation methods with low complexity for orthogonal frequency division multiple access (OFDMA) downlink is proposed. Subcarrier assignments for users are initialized independently, which may cause conflicts on arbitrary subcarriers. We suggest a method for conflict cancellation, which may be improved by using appropriate sorting criteria. The proposed method is compared to a newly suggested reference method by simulation. Within the simulation the performance loss is limited by about 5% whereas the complexity reduction is up to 95%.
Starting Page	1
Ending Page	6
File Size	144698
Page Count	6
File Format	PDF
ISBN	9781424421077
DOI	10.1109/WiCom.2008.212
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-12
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitters OFDM Bit error rate Downlink Frequency conversion Iterative algorithms Performance loss Resource management Information technology Sorting
Content Type	Text
Resource Type	Article

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