Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 69, Issue 2, Pages 728-739Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2020.3038185
Keywords
Decoding; Forward error correction; Polar codes; Complexity theory; Signal to noise ratio; Data centers; Modulation; Polar codes; staircase codes; multilevel coding; rate flexibility; data center interconnects
Funding
- Innovation Fund Denmark (INCOM project) [8057-00059B]
- DNRF Research Center of Excellence, SPOC [DNRF123]
- IFD [9066-00027A]
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A multilevel coding (MLC) based coded modulation scheme is proposed, offering rate flexibility and a reduction in decoder complexity for improved performance.
In this work, a multilevel coding (MLC) based coded modulation scheme with two degrees of freedom in rate flexibility is proposed and compared with a bit-interleaved coded modulation (BICM) scheme from a performance versus complexity perspective. The proposed MLC scheme is based on a rate flexible inner soft-decision polar code and utilizes an outer hard-decision staircase code structure as in the 400ZR concatenated forward error-correcting code. The performance of the MLC scheme is investigated for a range of inner code lengths, inner decoder list sizes, and signaling with 16 and 64 quadrature amplitude modulation, respectively. The MLC is designed such that a portion of the staircase encoded bits can bypass the inner code. The number of required inner soft-decision decoders can thus be reduced, thereby saving computational complexity. The proposed MLC scheme simultaneously offers up to a 53.7% reduction in the number of inner decoders and up to 0.55 dB of performance improvement when compared with the similar BICM approach.
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