Turbo Decoder for Low-Power Ultrawideband Communication Systems
Joint Authors
Source
International Journal of Digital Multimedia Broadcasting
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2009-01-13
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Engineering Sciences and Information Technology
Telecommunications Engineering
Electronic engineering
Information Technology and Computer Science
Abstract EN
A new method to reduce the computational complexity of the turbo decoding in ultrawideband (UWB) orthogonal frequency division multiplexing (OFDM) system is proposed.
Existing stopping techniques for turbo decoding process using constrained decoding assume fixed signal-to-noise ratio (SNR) for all the OFDM symbol bits so they fail to yield an acceptable bit-error rate (BER) performance in multicarrier systems.
In this paper, we propose a bit-level stopping technique for turbo decoding process based on the constrained decoding method.
In this technique, we combine the cyclic redundancy check (CRC) with an adaptive threshold on the log likelihood ratio (LLR) on each subcarrier to detect for convergence.
The threshold is adaptive in the sense that the threshold on the LLR of a bit is determined by the average SNR of the OFDM symbol and the channel gain of the transmission subcarrier.
Results show that when the channel state information (CSI) is used to determine the threshold on LLR, the stopping technique can reduce the computational complexity by about 0.5–2.5 equivalent iterations compared to GENIE turbo without degradation in the BER performance.
American Psychological Association (APA)
Obiedat, Esam A.& Cao, Lei. 2009. Turbo Decoder for Low-Power Ultrawideband Communication Systems. International Journal of Digital Multimedia Broadcasting،Vol. 2008, no. 2008, pp.1-7.
https://search.emarefa.net/detail/BIM-506340
Modern Language Association (MLA)
Obiedat, Esam A.& Cao, Lei. Turbo Decoder for Low-Power Ultrawideband Communication Systems. International Journal of Digital Multimedia Broadcasting No. 2008 (2008), pp.1-7.
https://search.emarefa.net/detail/BIM-506340
American Medical Association (AMA)
Obiedat, Esam A.& Cao, Lei. Turbo Decoder for Low-Power Ultrawideband Communication Systems. International Journal of Digital Multimedia Broadcasting. 2009. Vol. 2008, no. 2008, pp.1-7.
https://search.emarefa.net/detail/BIM-506340
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-506340