NDLI: Iterative Decoding of Virtual Differentially Coded OFDM Systems

Content Provider	IEEE Xplore Digital Library
Author	Ibi, S. Sampei, S.
Copyright Year	2015
Description	Author affiliation: Dept. of Inf. & Commun. Technol., Osaka Univ., Suita, Japan (Ibi, S.; Sampei, S.)
Abstract	This paper describes a virtual differentially coded system without a differential encoder at the transmitter and channel estimates at the receiver. Without the assistance of a differential encoder, a differential decoder detects a linearly multiplexed symbol that is constituted by two transmitted symbols in different times. In the virtual differentially coded system, the multiplexed symbol is regarded as a virtual symbol. In order to resolve the virtual symbol into the two original symbols, extrinsic log likelihood ratio (LLR), which is fed back from the channel decoder, is exploited with the aid of iterative decoding. For the sake of improving the convergence property of iterative decoding, sparse pilot symbols are doped in a stream of transmitted symbols. We demonstrate that the proposed system with a small number of sparse pilot tones is very assistive in terms of frame error rate (FER) performance. Furthermore, we explicitly show that the proposed approach outperforms the conventional differential and coherent detection schemes under the condition of a few sparse pilots.
Starting Page	1
Ending Page	6
File Size	747841
Page Count	6
File Format	PDF
ISBN	9781479980888
DOI	10.1109/VTCSpring.2015.7145893
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-11
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decoding Receivers OFDM Transmitters Iterative decoding Channel estimation Convergence
Content Type	Text
Resource Type	Article

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