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

Weithoffer, Stefan; Wehn, Norbert

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 inline-formular=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 inline-formula0.4inline-formula1.8 dB 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.



Weithoffer, Stefan / Wehn, Norbert: Where to go from here? New cross layer techniques for LTE Turbo-Code decoding at high code rates. 2018. Copernicus Publications.


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