Parameter Estimation of Convolutional and Helical Interleavers in a Noisy Environment

Forward error correction (FEC) codes followed by an interleaver play a significant role in improving the error performance of the digital systems by counteracting random and burst errors. In most of the applications, interleaver and FEC code parameters are known at the receiver to successfully de-in...

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Bibliographic Details
Published in:IEEE access 2017, Vol.5, p.6151-6167
Main Authors: Swaminathan, R., Madhukumar, A. S., Wee Teck, Ng, Chong Meng Samson See
Format: Article
Language:English
Subjects:
Algorithms
Bit error rate
Blind recognition
Cognitive radio
Convolutional codes
convolutional interleaver
Data transmission
Delays
Digital systems
Error analysis
Error correction
Estimation
Forward error correction
forward error correction (FEC) codes
helical interleaver
Parameter estimation
Receivers
Synchronism
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Summary:Forward error correction (FEC) codes followed by an interleaver play a significant role in improving the error performance of the digital systems by counteracting random and burst errors. In most of the applications, interleaver and FEC code parameters are known at the receiver to successfully de-interleave and decode the information bits. However, in certain non-cooperative applications, only partial information about the code and interleaver parameters is known. Furthermore, in cognitive radio applications, an intelligent receiver should adapt itself to the transmission parameters. Hence, there is a need to blindly estimate the FEC code and interleaver parameters in the mentioned applications from the received data stream with the availability of partial knowledge about the transmission parameters at the receiver. In this paper, a blind recognition of convolutional and helical interleaver parameters is carried out using innovative algorithms for unsynchronized, convolutionally encoded data in the presence of bit errors. In addition, the proposed algorithms also estimate the starting bit position for achieving proper synchronization. In a nutshell, it has been observed from the numerical results that the interleaver parameters have been estimated successfully over erroneous channel conditions from the proposed algorithms. Finally, the performances of the proposed algorithms for both the interleavers considering various bit error rate values have also been analyzed.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2017.2684189