Optimising the activation cycle of Turbo Decoders using three-dimensional extrinsic information transfer charts

2014 ◽  
Vol 8 (15) ◽  
pp. 2706-2712 ◽  
Author(s):  
Atiqa Kayani ◽  
Khurram Aziz ◽  
Shahid Khattak
Keyword(s):  
Information Transfer ◽  
Three Dimensional ◽  
Extrinsic Information ◽  
Turbo Decoders ◽  
Activation Cycle

scholarly journals Adding a Rate-1 Third Dimension to Parallel Concatenated Systematic Polar Code: 3D Polar Code

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Zhenzhen Liu ◽  
Kai Niu ◽  
Chao Dong ◽  
Jiaru Lin
Keyword(s):  
Full Advantage ◽  
Information Transfer ◽  
Three Dimensional ◽  
Error Floor ◽  
Extrinsic Information ◽  
Exit Chart ◽  
Convergence Behavior ◽  
Polar Code ◽  
Simulation Results ◽  
Third Dimension

In this paper, a three-dimensional polar code (3D-PC) scheme is proposed to improve the error floor performance of parallel concatenated systematic polar code (PCSPC). The proposed 3D-PC is constructed by serially concatenating the PCSPC with a rate-1 third dimension, where only a fraction λ of parity bits of PCSPC are extracted to participate in the subsequent encoding. It takes full advantage of the characteristics of parallel concatenation and serial concatenation. In addition, the convergence behavior of 3D-PC is analyzed by the extrinsic information transfer (EXIT) chart. The convergence loss between PCSPC λ=0 and different λ provides the reference for choosing the value of λ for 3D-PC. Finally, the simulation results confirm that the proposed 3D-PC scheme lowers the error floor.

Application of Extrinsic Information Transfer Charts to Anticipate Turbo Code Behavior

2013 ◽  
pp. 97-104
Author(s):  
Izabella Lokshina
Keyword(s):  
Turbo Codes ◽  
Iterative Decoding ◽  
Information Transfer ◽  
Turbo Code ◽  
A Priori ◽  
Substantial Reduction ◽  
International Standards ◽  
Extrinsic Information ◽  
Exit Chart ◽  
Analysis Technique

This paper examines turbo codes that are currently introduced in many international standards, including the UMTS standard for third generation personal communications and the ETSI DVB-T standard for Terrestrial Digital Video Broadcasting. The convergence properties of the iterative decoding process associated with a given turbo-coding scheme are estimated using the analysis technique based on so-called extrinsic information transfer (EXIT) chart. This approach provides a possibility to anticipate the bit error rate (BER) of a turbo code system using only the EXIT chart. It is shown that EXIT charts are powerful tools to analyze and optimize the convergence behavior of iterative systems utilizing the turbo principle. The idea is to consider the associated SISO stages as information processors that map input a priori LLR’s onto output extrinsic LLR’s, the information content being obviously assumed to increase from input to output, and introduce them to the design of turbo systems without the reliance on extensive simulation. Compared with the other methods for generating EXIT functions, the suggested approach provides insight into the iterative behavior of linear turbo systems with substantial reduction in numerical complexity.

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