Influence of Extrinsic Information Scaling Coefficient on Double-Iterative Decoding Algorithm for Space-Time Turbo Codes with Large Number of Antennas

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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Performance Comparison of Iterative Decoding Algorithm Using the Extrinsic Information Transfer Chart

Sixth International Conference on Networking (ICN'07) ◽

10.1109/icn.2007.69 ◽

2007 ◽

Author(s):

Xuelan Zou ◽

Guangzeng Feng

Keyword(s):

Iterative Decoding ◽

Information Transfer ◽

Performance Comparison ◽

Extrinsic Information ◽

Decoding Algorithm

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Application of Extrinsic Information Transfer Charts to Anticipate Turbo Code Behavior

International Journal of Interdisciplinary Telecommunications and Networking ◽

10.4018/jitn.2011040102 ◽

2011 ◽

Vol 3 (2) ◽

pp. 31-37 ◽

Cited By ~ 2

Author(s):

Izabella Lokshina

Keyword(s):

Turbo Codes ◽

Iterative Decoding ◽

Information Transfer ◽

Turbo Code ◽

A Priori ◽

Substantial Reduction ◽

International Standards ◽

Extrinsic Information ◽

Suggested Approach ◽

Exit Chart

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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Digital Communications and a Smart World

Strategic Innovations and Interdisciplinary Perspectives in Telecommunications and Networking - Advances in Wireless Technologies and Telecommunication ◽

10.4018/978-1-5225-8188-8.ch007 ◽

2019 ◽

pp. 136-163

Author(s):

Hua Zhong

Keyword(s):

Turbo Codes ◽

Iterative Decoding ◽

Communication Systems ◽

Information Transfer ◽

Turbo Code ◽

Digital Communications ◽

Substantial Reduction ◽

International Standards ◽

Extrinsic Information ◽

Likelihood Ratios

This chapter is devoted to digital communications in a smart world. The author examines turbo codes that are currently introduced in many international standards and implemented in numerous advanced communication systems, applied in a smart world, and evaluate the process of extrinsic information transfer (EXIT). 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 EXIT charts. This approach provides a possibility to predict the bit-error rate (BER) of a turbo code system with only the extrinsic information transfer chart. The idea is to consider the associated soft-input soft-output (SISO) stages as information processors, which map input a priori log likelihood ratios (LLRs) onto output extrinsic LLRs. Compared with other methods, the suggested approach provides insight into the iterative behavior of linear turbo systems with substantial reduction in numerical complexity.

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