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Reduced complexity log-map algorithm with Jensen inequality based non-recursive max* operator for turbo TCM decoding

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2013年第1期000卷 1-11页

作者： Sybis, Michal Tyczka, Piotr Poznan Univ Tech Chair Wireless Commun PL-60965 Poznan Poland

In this paper, a reduced complexity log-map algorithm based on a non-recursive approximation of the max* operator is presented and studied for turbo trellis-coded modulation (TTCM) systems. In the algorithm, denoted as AvN log-map, the max* operation is generalized and performed on n >= 2 arguments. The approximation is derived from the Jensen inequality. The non-recursive form of the max* calculations allows to achieve significant reduction in the decoding effort in comparison to the conventional log-map algorithm. Bit-error rate performance simulation results for serial and parallel TTCM schemes in the additive white Gaussian noise and uncorrelated Rayleigh fading channels show that the AvN log-map algorithm performs close to the log-map. Performance and complexity comparisons of the AvN log-map algorithm against the log-map and several relevant reduced complexity turbo decoding algorithms proposed in the literature reveal, that it offers favorable low computational effort for the price of small performance degradation.

关键词： Decoding algorithms log-map algorithm Reduced-complexity algorithms max* operator Jacobian logarithm Turbo TCM

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The Performance of ST-Turbo TC Based on the Improved log-map algorithm

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WIRELESS PERSONAL COMMUNICATIONS 2012年第4期62卷 959-964页

作者： Wu, Yao-Jun Li, Li-Xin Wu, Ya-Wei E China Univ Sci & Technol Sch Informat Sci & Engn Shanghai 200237 Peoples R China

The iterative decoding in turbo code has very high decoding complexity. This paper adopts the improved log-map algorithm for decoding of Space-Time Turbo Trellis Code (ST-Turbo TC) in the slow Rayleigh fading channels. Using the MacLaurin formulae, the proposed algorithm expands the logarithmic function of the log-map. It makes the computation much easier and the operation of the hardware system much faster. Simulation results show that the proposed algorithm performs very closely to the log-map algorithm for decoding of ST-Turbo TC in slow Rayleigh fading channels.

关键词： Space-Time turbo trellis code log-map algorithm Max-log-map algorithm Improved log-map algorithm

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Design & Implementation of Efficient Turbo Equalizer for Noise Reduction

Design & Implementation of Efficient Turbo Equalizer for Noi...

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International Conference on Energy, Communication, Data Analytics and Soft Computing

作者： Neha Sharma Jyoti Sharma Samir Mishra Electronics & Communication Engineering Department Rama University Kanpur India

ISBN: (纸本)9781538618882

This paper presents design and implementation of efficient turbo equalizer for Noise reduction. Linear turbo equalizer is a combination of soft input soft output (SISO) equalizer and soft input soft output (SISO) decoder, which exchanges their information iteratively. The propose architecture uses least mean square (LMS) adaptive algorithm for equalization of received symbols in the design of SISO equalizer block as hardware intricacy required to design equalizer is small when compared to other equalizers. SISO (soft input soft output) decoder block has been designed using sliding window log-map algorithm. The log-map decoding algorithm is selected for implementation of the constituent Soft-Input/Soft-Output (SISO) decoder;the algorithm is approximated by a fixed-point representation that achieves the best performance/complexity trade-off. Our simulation results shows that the proposed design and implementation gives better bit error rate (BER) performance and convergence rate over conventional equalizer for prokis channels.

关键词： Turbo Equalizer Noise Soft-Input Soft-Output Forward Error Correction log-map algorithm

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A NOVEL SIMPLIFIED log-map algorithm SUITABLE FOR HARDWARE IMPLEMENTATION OF TURBO DECODING

A NOVEL SIMPLIFIED LOG-MAP ALGORITHM SUITABLE FOR HARDWARE I...

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24th Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Thangarajah, Krishnamohan Shahrrava, Behnam Khalid, Mohammed A. S. Univ Windsor Dept Elect & Comp Engn Windsor ON N9B 3P4 Canada

ISBN: (纸本)9781424497898

In this paper, we propose a simplified log-map algorithm that is equivalent to the log-map algorithm in terms of the bit-error-rate (BER) performance, but without its implementation difficulties. The proposed algorithm is based on a linear approximation of the correction function in the log-map algorithm over different signal-to-noise ratio (SNR) regions. This approximation is simple to implement by avoiding the number of complicated operations. Simulation results demonstrate that this simplified algorithm can achieve the same BER performance as the log-map algorithm.

关键词： Turbo Decoding log-map algorithm MAX-log-map algorithm Bit-Error-Rate Performance

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VHDL Implementation of Low-Power Turbo Decoder

VHDL Implementation of Low-Power Turbo Decoder

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IEEE-Uttar-Pradesh-Section International Conference on Electrical, Computer, and Electronics Engineering (UPCON)

作者： Vijyata Meena, R. S. Sharma, J. B. Rajasthan Tech Univ Dept Elect Engn Kota India

ISBN: (纸本)9781509053841

Due to famous mistake revising probability turbo coding is significantly used as a piece of advanced correspondence systems. In this paper different arrangement of turbo decoder with decreased element constrain dissemination is shown. In this changed decoder, standard cell based design using pipeline logarithm-most extreme a back (log-map) calculation with clock gating and variable number of cycle is used to reduce the territory and to expand the throughput. Proposed design of modified log-outline decoder is mimicked and mixes using Xilinx14.2. Outcomes of the proposed low-control balanced log-map decoder are better than the customary log-map turbo decoder.

关键词： log-map algorithm LLR BMC ACS BSMC FSMC VHDL

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Complexity Reduced log-map algorithm for the Turbo Decoding

Complexity Reduced Log-MAP Algorithm for the Turbo Decoding

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International Conference on Artificial Intelligence and Computational Intelligence

作者： Lou Xizhong Chen Yanmin Jin Ning China Jiliang Univ Coll Informat Engn Hangzhou Zhejiang Peoples R China China Jiliang Univ Coll Comp Sci Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9780769538167

Due to the high complexity of the log-map algorithm, many modifications and simplifications were proposed to simplify the VLSI implementation of turbo decoding. A new way to reduce the complexity of the log-map algorithm is presented. It takes place of log and exp operation with look-up table without considering the channel state information, which make the decoding process more easily and faster. In some communication system, it is hard or impossible to estimate the channel state information. It allows for efficient ASIC implementation and almost has the same performance as the log-map algorithm. The simulation results show that the presented algorithm has a good performance in all circumstance.

关键词： Turbo code log-map algorithm look-up table

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Low Power design of near Shannon Limit Coding: Turbo Codes

Low Power design of near Shannon Limit Coding: Turbo Codes

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International Conference on Materials Science and Information Technology (MSIT 2011)

作者： Maity, Niladri Pratap Maity, Reshmi Mizoram Univ Cent Univ Govt India Dept Elect & Commun Engn Aizawl Mizoram India

ISBN: (纸本)9783037853191

In this paper secure channel coding schemes based on Turbo Codes are suggested and implemented. The design of encoder using Recursive Systematic Code (RSC) with puncturing techniques is presented. Component decoders are implemented by log-Maximum-a-Posteriori (log-map) algorithm and thereafter implementation of overall turbo decoder is illustrated in detail. Finally we have investigated low power design technique of the turbo decoder design with variable iteration techniques.

关键词： Turbo Codes RSC log-map algorithm LLR

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Simplified log-map Decoding with max* Approximation Based on the Jensen Inequality

Simplified Log-MAP Decoding with <i>max</i>* Approximation B...

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21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Sybis, Michal Tyczka, Piotr Papaharalabos, Stylianos Mathiopoulos, Panayiotis Takis Poznan Univ Tech Chair Wireless Commun Poznan Poland Natl Observ Athens Inst Space Applicat & Remote Sensing Athens Greece

ISBN: (纸本)9781424480166

In the paper, a modified log-map algorithm based on a novel approximation of the max* operator derived from the Jensen inequality is proposed. In this approach, the max* operation is performed on n >= 2 arguments, thus the recursive calculations are avoided and significant reduction in the number of operations performed per decoding step, as compared with the conventional log-map, is achieved. Simulation results of BER performance for both turbo codes and turbo trellis-coded modulation (TTCM) employing the new algorithm are given, showing the near-optimal performance of the proposed algorithm.

关键词： decoding algorithms log-map algorithm Turbo codes Turbo TCM max* operator reduced-complexity algorithms

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A Novel Bit-interleaved Serial Concatenated Scheme for OvCDM

A Novel Bit-interleaved Serial Concatenated Scheme for OvCDM

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Global Mobile Congress 2009

作者： Yang Chun-ping Jiang Wei Li Dao-ben North China Elect Power Univ Sch Elect & Elect Engn Commun Staff Room Beijing Peoples R China Beijing Univ Posts & Telecommun Sch Informat Engn Beijing 100876 Peoples R China

ISBN: (纸本)9781424453023

A novel bit-interleaved serial concatenated scheme for OvCDM is studied, characterized in that one or more OvCDM codes are as component codes in bit-interleaved serial concatenated OvCDM to make up such a bit-interleaved serial concatenated code with higher spectrum efficiency. The bit-interleaved serial concatenated OvCDM uses iterative decoding algorithm based on log-map algorithm with soft input soft ouput (SISO). Comparing with un-concatenated OvCDM, the bit-interleaved serial concatenated OvCDM is easier to achieve higher spectral efficiency and the decoding complexity is reduced significantly.

关键词： OvCDM Spectral Efficiency log-map algorithm Bit-interleaved Serial Concatenated Scheme

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A Novel Product Concatenated Scheme for OvCDM

A Novel Product Concatenated Scheme for OvCDM

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Global Mobile Congress 2009

作者： Yang Chun-ping Jin Xin Li Dao-ben North China Elect Power Univ Sch Elect & Elect Engn Commun Staff Room Beijing Peoples R China Beijing Univ Posts & Telecommun Sch Informat Engn Beijing 100876 Peoples R China

ISBN: (纸本)9781424453023

A novel product concatenated scheme for OvCDM is proposed, characterized in that one or more OvCDM codes are as component codes in product concatenated OvCDM. The product concatenated OvCDM system is to make up a product concatenated code with higher spectrum efficiency. The product concatenated OvCDM uses iteratively decoding algorithm based on log-map algorithm. Comparing with un-concatenated OvCDM, the performance of product concatenated OvCDM is closer to the Shannon limit.

关键词： OvCDM log-map algorithm product Concatenated Scheme Shannon Limit

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