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Advances in Radio Science An open-access journal of the U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V.
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Volume 16
Adv. Radio Sci., 16, 77-87, 2018
https://doi.org/10.5194/ars-16-77-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Adv. Radio Sci., 16, 77-87, 2018
https://doi.org/10.5194/ars-16-77-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  04 Sep 2018

04 Sep 2018

Where to go from here? New cross layer techniques for LTE Turbo-Code decoding at high code rates

Stefan Weithoffer and Norbert Wehn Stefan Weithoffer and Norbert Wehn
  • Department of Electrical and Computer Engineering, University of Kaiserslautern, Kaiserslautern, Germany

Abstract. The wide range of code rates and code block sizes supported by todays wireless communication standards, together with the requirement for a throughput in the order of Gbps, necessitates sophisticated and highly parallel channel decoder architectures. Code rates specified in the LTE standard, which uses Turbo-Codes, range up to r = 0.94 to maximize the information throughput by transmitting only a minimum amount of parity information, which negatively impacts the error correcting performance. This especially holds for highly parallel hardware architectures. Therefore, the error correcting performance must be traded-off against the degree of parallel processing.

State-of-the-art Turbo-Code decoder hardware architectures are optimized on code block level to alleviate this trade-off. In this paper, we follow a cross-layer approach by combining system level knowledge about the rate-matching and the transport block structure in LTE with the bit-level technique of on-the-fly CRC calculation. Thereby, our proposed Turbo-Code decoder hardware architecture achieves coding gains of 0.4–1.8dB compared to state-of-the-art accross a wide range of code block sizes.

For the fully LTE compatible Turbo-Code decoder, we demonstrate a negligible hardware overhead and a resulting high area and energy efficiency and give post place and route synthesis numbers.

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