NDLI: Study of pilot overhead for iterative OFDM receivers on time-varying and sparse underwater acoustic channels

Content Provider	IEEE Xplore Digital Library
Author	Berger, C.R. Jie Huang Moura, J.M.F.
Copyright Year	2011
Description	Author affiliation: Wireless System R&D, Marvell Semiconductor, Santa Clara, CA 95054, USA (Jie Huang) \|\| Dept. of Electrical & Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA (Berger, C.R.; Moura, J.M.F.)
Abstract	While the frequency-selectivity of underwater acoustic channels motivates the use of orthogonal frequency division multiplexing (OFDM), the time-selectivity leads to large pilot overhead for channel estimation and Doppler effects that cause intercarrier interference (ICI). ICI can be estimated and mitigated using an appropriate channel model, but in turn leads to even further increased demand on pilot overhead. While sparse channel estimation can alleviate this challenge, pilot resources for channel estimation are always a precious commodity. We therefore study iterative receivers that feed back tentative or soft symbol decisions from error correction to be used as additional pilots in the next iteration of channel estimation. The key point is that this can be coupled with sparse channel estimation and that the uncertainty in soft decisions is modeled accurately. We use an experimentally recorded data set to compare the performance of sparse and conventional channel estimators under varying pilot overhead. We find that when increasing the pilot overhead - at the cost of reduced data rate - the performance saturates at some point. This point varies depending on if ICI is estimated or not, and is reached much earlier when using iterative receivers.
Starting Page	1
Ending Page	8
File Size	670832
Page Count	8
File Format	PDF
ISBN	9781457714276
e-ISBN	9780933957398
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Channel estimation Receivers OFDM Delay Doppler effect Parity check codes Vectors
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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