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2012 (Vol. 4, Issue: 18)
Article Information:

An Improved Rate Matching Method for DVB Systems Through Pilot Bit Insertion

Seyed Mohammad-Sajad Sadough and Mohammad Modarresi
Corresponding Author:  Seyed Mohammad-Sajad Sadough 

Key words:  Turbo code, puncturing, pilot bit insertion, DVB-SH, BICM, rate matching,
Vol. 4 , (18): 3251-3256
Submitted Accepted Published
December 28, 2011 March 02, 2012 September 15, 2012

Classically, obtaining different coding rates in turbo codes is achieved through the well known puncturing procedure. However, puncturing is a critical procedure since the way the encoded sequence is punctured influences directly the decoding performance. In this work, we propose to mix the data sequence at the turbo encoder input inside the Digital Video Broadcasting (DVB) standard with some pilot (perfectly known) bits. By using variable pilot insertion rates, we achieve different coding rates with more flexibility. The proposed scheme is able to use a less complex mother code compared to that used in a conventional punctured turbo code. We also analyze the effect of different type of pilot insertion such as random and periodic schemes. Simulation results provided in the context of DVB show that in addition to providing flexible encoder design and reducing the encoder complexity, pilot insertion can improve slightly the performance of turbo decoders, compared to a conventional punctured turbo code.
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  Cite this Reference:
Seyed Mohammad-Sajad Sadough and Mohammad Modarresi, 2012. An Improved Rate Matching Method for DVB Systems Through Pilot Bit Insertion.  Research Journal of Applied Sciences, Engineering and Technology, 4(18): 3251-3256.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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