By Topic

Link-Level Evaluations of Low Rate Code Extensions of Turbo Codes Using Shortened Code Techniques

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Shunji Miyazaki ; Fujitsu Lab. Ltd., Yokosuka ; Kazuhisa Ohbuchi

In this paper we consider methods of applying shortened code techniques to turbo codes (Berrou, 1993) in order to construct codes with a lower code rate than the original turbo codes. As long as the difference of the code rates is not so large, the methods can provide some coding gain compared with bit repetition schemes. For turbo codes, we can consider two types of shortened codes that we term the "outer method" and "inner method." For the UTRA turbo code, which has a code rate of 1/3, simulations show that the performance gain is about 0.2 dB for the outer method and about 0.4 dB for the inner method, and the performance is degraded at most by about 0.1 dB even compared with a dedicated turbo code with a rate of 1/5 for rates of between 1/9 and 1/7. The complexities of the decoder for the methods are also considered. The complexities slightly increase compared with the bit repetition schemes based on the same code formats but are similar to the dedicated code.

Published in:

2007 IEEE 66th Vehicular Technology Conference

Date of Conference:

Sept. 30 2007-Oct. 3 2007