NDLI: Variable-rate equal-power waterfilling for non-binary LDPC coded multicarrier systems

Content Provider	IEEE Xplore Digital Library
Author	Boccolini, G. Fijalkow, I.
Copyright Year	2010
Description	Author affiliation: ETIS, CNRS, ENSEA, Université Cergy-Pontoise, 6, avenue du Ponceau, F-95000, France (Boccolini, G.; Fijalkow, I.)
Abstract	This paper presents a link adaptation strategy for non-binary LDPC code over a time-variant frequency-selective channel. The algorithm is based first on the adoption of waterfilling technique to wisely adapt the transmitted power. It is shown that as long as best subchannels are identified with the waterfilling algorithm, an equal power distribution can be applied with performance comparable to the ideal power adaptation. What it is more important is to decide which are the subchannels that should not be used in order to increase the energy efficiency of the system. The throughput is increased with the adoption of multilevel modulations that changes the rate of each subchannel depending on the channel-to-noise ratio and the quality of service required. The Galois Field GF(64) code symbols are mapped into four modulation schemes (BPSK, 4QAM, 16QAM, 64QAM) and the channel is assumed to be constant over six OFDM symbols. Simulation results are presented when a perfect channel state information is available at the transmitter and at the receiver side. In real dynamic channel environments, the performance of the system degrades due to the delay and the approximation of the feedback information. Simulation of partial channel state information scenario is also reported.
Starting Page	425
Ending Page	430
File Size	1527774
Page Count	6
File Format	PDF
ISBN	9781424480173
e-ISBN	9781424480166
DOI	10.1109/PIMRC.2010.5671883
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-26
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Bit error rate Binary phase shift keying Parity check codes Signal to noise ratio Throughput link adaptation Non-binary LDPC codes adaptive modulation multilevel waterfilling frequency selective channel
Content Type	Text
Resource Type	Article

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