Improving the max-log-MAP turbo decoder

Vogt, Juliane; Finger, Adolf

doi:10.1049/el:20001357

Cited by 233 publications

(130 citation statements)

References 3 publications

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“…The block size of the information word is 12282 bits, and code rates from 1/5 to 6/7 are analyzed. Max-log-algorithm with correction factor [12] and fix-point model with five bits quantization is used. Please note that if I ef is equal to the code rate (dashed line), the FEC block is ideal, achieving the channel capacity.…”

Section: B Fec Blockmentioning

confidence: 99%

Design and Evaluation of a Multilevel Decoder for Satellite Communications

Vargas

Breiling

Gerstacker

2009

2009 IEEE International Conference on Communications

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Abstract-In this paper, we propose a multilevel coding (MLC) scheme suitable for satellite communications, where different QoS levels are required. We introduce a novel characterization of schemes based on mutual information, called multi-stage decoder (MSD) charts, to aid in the design and evaluation of multilevel coding systems. This characterization method finds the optimal set of code rates for the MLC scheme for a set of required SNR operation points. On the other hand, fixing the code rates to find out the operation points of SNR is also possible. Performance of common mapping strategies used in MLC schemes, as block labeling and Ungerböck labeling, are evaluated using MSD charts. An established transmission scheme for satellite broadcasting, European Satellite Digital Radio (ESDR) standard, is compared with the proposed MLC scheme, showing that the MLC scheme is able to work in lower SNR regions and provides more flexibility in designing the levels.

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Section: B Fec Blockmentioning

confidence: 99%

Design and Evaluation of a Multilevel Decoder for Satellite Communications

Vargas

Breiling

Gerstacker

2009

2009 IEEE International Conference on Communications

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“…In addition, more performance improvement is expected in the proposed hybrid log-MAP decoding if it is associated with the scaling technique due to the features of the Max-log-MAP decoding [10], [11].…”

Section: Quantizationmentioning

confidence: 99%

Low-Power Hybrid Turbo Decoding Based on Reverse Calculation

Choi

Kim

Park

2006

IEICE Transactions on Fundamentals of Electronics, Communicatio

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Abstract-As turbo decoding is a highly memory-intensive algorithm consuming large power, a major issue to be solved in practical implementation is to reduce power consumption. This paper presents an efficient reverse calculation method to lower the power consumption by reducing the number of memory accesses required in turbo decoding. The reverse calculation method is proposed for the Max-log-MAP algorithm, and it is combined with a scaling technique to achieve a new decoding algorithm, called hybrid log-MAP, that results in a similar BER performance to the log-MAP algorithm. For the W-CDMA standard, experimental results show that 80% of memory accesses are reduced through the proposed reverse calculation method. A hybrid log-MAP turbo decoder based on the proposed reverse calculation reduces power consumption and memory size by 34.4% and 39.2%, respectively.

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“…The channel coefficients include the zero-mean complex Gaussian component accounting for the Rayleigh fading. The Zero-Forcing receiver (for the Alamouti STC) and the list Sphere Decoder [28] followed by a max-log MAP turbo decoder [29] For the HARQ-II protocol up to 3 different puncturing matrices have been defined in the BS and other 3 for the RS (for Cooperative D&F and Mixed D&F). As we have fixed the maximum number of re-transmissions to 10, the puncturing matrices have to be used several times.…”

Section: Configurationmentioning

confidence: 99%

Hybrid Turbo FEC/ARQ Systems and Distributed Space-Time Coding for Cooperative Transmission

Agustín

Vidal

Muñoz

2005

Int J Wireless Inf Networks

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Abstract.-Cooperative transmission can be seen as a "virtual" MIMO system, where the multiple transmit antennas are in fact implemented distributed by the antennas both at the source and the relay terminal. Depending on the system design, diversity/multiplexing gains are achievable. This design involves the definition of the type of retransmission (incremental redundancy, repetition coding), the design of the distributed space-time codes, the error correcting scheme, the operation of the relay (decode&forward or amplify&forward) and the number of antennas at each terminal. Proposed schemes are evaluated in different conditions in combination with forward error correcting codes (FEC), both for linear and near-optimum (sphere decoder) receivers, for its possible implementation in downlink high speed packet services of cellular networks. Results show the benefits of coded cooperation over direct transmission in terms of increased throughput. It is shown that multiplexing gains are observed even if the mobile station features a single antenna, provided that cell wide reuse of the relay radio resource is possible.

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Improving the max-log-MAP turbo decoder

Cited by 233 publications

References 3 publications

Design and Evaluation of a Multilevel Decoder for Satellite Communications

Design and Evaluation of a Multilevel Decoder for Satellite Communications

Low-Power Hybrid Turbo Decoding Based on Reverse Calculation

Hybrid Turbo FEC/ARQ Systems and Distributed Space-Time Coding for Cooperative Transmission

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