Abstract
Capacity-achieving polar codes have gained significant attention in recent years. In general, polar codes can be decoded by either successive cancellation (SC) or the belief propagation (BP) algorithm. However, unlike SC decoders, performance optimizations for BP decoders have not been fully explored yet. In this paper, we explore novel early stopping criteria for polar BP decoding to significantly reduce energy dissipation and decoding latency. First, we propose two detection-type novel early stopping criteria for detecting valid outputs. For polar (1024, 512) codes, these two stopping criteria can reduce the number of iterations by up to 42.5% at 3.5 dB. Then, we propose a novel channel condition estimation approach, which can help select different stopping criteria in different SNR regions. Furthermore, the hardware architectures of polar BP decoders with the proposed stopping criteria are presented and developed. Synthesis results show that with the use of the proposed stopping criteria, the energy dissipation, and average latency of polar (1024, 512) BP decoder can be reduced by 10% ~ 30% with 2% ~ 5% hardware overhead, and average throughput can be increased by 20% ~ 55%.
| Original language | English (US) |
|---|---|
| Article number | 6942260 |
| Pages (from-to) | 6496-6506 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Signal Processing |
| Volume | 62 |
| Issue number | 24 |
| DOIs | |
| State | Published - Dec 15 2014 |
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Keywords
- Belief propagation (BP)
- VLSI
- early stopping criteria
- energy-efficient
- low-latency
- polar codes
Cite this
Early stopping criteria for energy-efficient low-latency belief-propagation polar code decoders. / Yuan, Bo; Parhi, Keshab K.
In: IEEE Transactions on Signal Processing, Vol. 62, No. 24, 6942260, 15.12.2014, p. 6496-6506.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Early stopping criteria for energy-efficient low-latency belief-propagation polar code decoders
AU - Yuan, Bo
AU - Parhi, Keshab K
PY - 2014/12/15
Y1 - 2014/12/15
N2 - Capacity-achieving polar codes have gained significant attention in recent years. In general, polar codes can be decoded by either successive cancellation (SC) or the belief propagation (BP) algorithm. However, unlike SC decoders, performance optimizations for BP decoders have not been fully explored yet. In this paper, we explore novel early stopping criteria for polar BP decoding to significantly reduce energy dissipation and decoding latency. First, we propose two detection-type novel early stopping criteria for detecting valid outputs. For polar (1024, 512) codes, these two stopping criteria can reduce the number of iterations by up to 42.5% at 3.5 dB. Then, we propose a novel channel condition estimation approach, which can help select different stopping criteria in different SNR regions. Furthermore, the hardware architectures of polar BP decoders with the proposed stopping criteria are presented and developed. Synthesis results show that with the use of the proposed stopping criteria, the energy dissipation, and average latency of polar (1024, 512) BP decoder can be reduced by 10% ~ 30% with 2% ~ 5% hardware overhead, and average throughput can be increased by 20% ~ 55%.
AB - Capacity-achieving polar codes have gained significant attention in recent years. In general, polar codes can be decoded by either successive cancellation (SC) or the belief propagation (BP) algorithm. However, unlike SC decoders, performance optimizations for BP decoders have not been fully explored yet. In this paper, we explore novel early stopping criteria for polar BP decoding to significantly reduce energy dissipation and decoding latency. First, we propose two detection-type novel early stopping criteria for detecting valid outputs. For polar (1024, 512) codes, these two stopping criteria can reduce the number of iterations by up to 42.5% at 3.5 dB. Then, we propose a novel channel condition estimation approach, which can help select different stopping criteria in different SNR regions. Furthermore, the hardware architectures of polar BP decoders with the proposed stopping criteria are presented and developed. Synthesis results show that with the use of the proposed stopping criteria, the energy dissipation, and average latency of polar (1024, 512) BP decoder can be reduced by 10% ~ 30% with 2% ~ 5% hardware overhead, and average throughput can be increased by 20% ~ 55%.
KW - Belief propagation (BP)
KW - VLSI
KW - early stopping criteria
KW - energy-efficient
KW - low-latency
KW - polar codes
UR - http://www.scopus.com/inward/record.url?scp=84913569207&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84913569207&partnerID=8YFLogxK
U2 - 10.1109/TSP.2014.2366712
DO - 10.1109/TSP.2014.2366712
M3 - Article
AN - SCOPUS:84913569207
VL - 62
SP - 6496
EP - 6506
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
SN - 1053-587X
IS - 24
M1 - 6942260
ER -