Block Orthogonal Sparse Superposition Codes for Ultra-Reliable Low-Latency Communications
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- Title
- Block Orthogonal Sparse Superposition Codes for Ultra-Reliable Low-Latency Communications
- Authors
- Han, Donghwa; Park, Jeonghun; Lee, Youngjoo; Poor, H. Vincent; Lee, Namyoon
- Date Issued
- 2023-12
- Publisher
- Institute of Electrical and Electronics Engineers
- Abstract
- Low-rate and short-packet transmissions are important for ultra-reliable low-latency communications (URLLC). In this paper, we put forth a new family of sparse superposition codes for URLLC, called block orthogonal sparse superposition (BOSS) codes. We first present a code construction method for the efficient encoding of BOSS codes. The key idea is to construct codewords by the superposition of the orthogonal columns of a dictionary matrix with a sequential bit mapping strategy. We also propose an approximate maximum a posteriori probability (MAP) decoder with two stages. The approximate MAP decoder reduces the decoding latency significantly via a parallel decoding structure while maintaining a comparable decoding complexity to the successive cancellation list (SCL) decoder of polar codes. Furthermore, to gauge the code performance in the finite-blocklength regime, we derive an exact analytical expression for block-error rates (BLERs) of single-layered BOSS codes in terms of relevant code parameters. Lastly, we present a cyclic redundancy check aided-BOSS (CA-BOSS) code with simple list decoding to boost the code performance. Our experiments verify that CA-BOSS codes with the simple list decoder outperform CA-polar codes with SCL decoding in the low-rate and finite-blocklength regimes while achieving the finite-blocklength capacity upper bound within one dB of signal-to-noise ratio. © 1972-2012 IEEE.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/120344
- DOI
- 10.1109/tcomm.2023.3317912
- ISSN
- 0090-6778
- Article Type
- Article
- Citation
- IEEE Transactions on Communications, vol. 71, no. 12, page. 6884 - 6897, 2023-12
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