A CRC-Aided Hybrid Decoding Algorithm for Turbo Codes

Wei, Yuejun; Jiang, Ming; Xia, Bin; Chen, Wen; Yang, Yuhang

doi:10.1109/wcl.2013.052813.130259

Cited by 15 publications

(8 citation statements)

References 13 publications

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“…E. Migabo et al [40] study the energy-efficient channel coding scheme based on adaptive MCS scheme. Authors in [41] studied the CRC aided hybrid decoding for turbo codes. J. Yang et al [42] proposed an energy-efficient HARQ transmission using field test analysis.…”

Section: Related Workmentioning

confidence: 99%

An Efficient Polar Coding Scheme for Uplink Data Transmission in Narrowband Internet of Things Systems

et al. 2020

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Narrowband Internet of Things (NB-IoT) is an emerging IoT cellular-based wireless technology that builds based on the existing LTE standard to extend its network coverage suited for Low Power Wide Area Network (LPWAN) connectivity. In the NB-IoT system, LTE turbo codes and Cyclic Redundancy Check (CRC) codes are adopted as the main channel coding technique for Narrowband Physical Uplink Shared Channel (NPUSCH). However, turbo codes require iterative decoding algorithm at the expense of high computation complexity of decoding hence is crucial to achieving the LPWAN requirement of NB-IoT systems. Polar codes are best suited in this regard due to its capacity approaching and complexity reduction in short block length code. In this paper, we proposed an efficient polar coding technique using the Belief Propagation (BP) decoding algorithm for uplink data transmission on the NPUSCH channel. Furthermore, the BP algorithm is incorporated with the CRC stoppage criterion to decrease the number of decoding iteration and reduce computational complexity. In this scheme, singletone numerology of NPUSCH using 3.75 kHz and 15 kHz subcarrier spacing is adopted. Then, the encoded data is generated with different NPUSCH resources. The theoretical formulation and simulation demonstrate that the proposed scheme provides better error rate performance over the adopted LTE turbo codes and other polar decoding algorithms while reducing the computational complexity. INDEX TERMS Narrowband IoT (NB-IoT), BP polar decoding algorithm, Narrowband Physical Uplink Shared Channel (NPUSCH), cyclic redundancy check (CRC), block error rate (BLER).

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Section: Related Workmentioning

confidence: 99%

An Efficient Polar Coding Scheme for Uplink Data Transmission in Narrowband Internet of Things Systems

et al. 2020

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“…In this Letter, we change the computation sequence of the block position x nN and the weight of the S-bit data on the sub-block x mS , so that the decoded S-bit a n , mS + k •x k is weighted by the CRC of the block position with the GF multiplication as denoted in (3). The computation within the indices of the clock cycle m can be performed by fully combinational logic and it is processed in one clock cycle.…”

Section: Fig 1 Timing and Computation Process Diagrams Of Conventionmentioning

confidence: 99%

“…As shown in Fig. 2, we reduce the complexity of the GF multiplier and propose a weighted S-bit parallel LFSR by exploiting (3). The most significant improvement is that the GF multiplier can be simplified from the general 24 bit multiplicand to the small S-bit multiplicand compared with the merged CRC unit.…”

Section: Fig 1 Timing and Computation Process Diagrams Of Conventionmentioning

confidence: 99%

Low‐complexity CRC‐aided early stopping unit for parallel turbo decoder

2015

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A low-complexity distributed cyclic redundancy check (CRC) architecture for the CRC-aided early stopping unit is proposed. In the previous distributed CRC unit, the general high-order Galois field (GF) multiplier occupies almost the area of the CRC unit and requires high-hardware cost and long critical path-delay. Accordingly, a computation algorithm based on GF arithmetic is analysed and an optimal CRC unit with the small order of the GF multiplier and newly designed linear feedback shift register is proposed. The proposed CRC architecture is implemented in 65 nm CMOS process for radix-2 2 and radix-2 4 parallel turbo decoders based on LTE-Advanced. In the radix-2 2 system, reductions of about 57.1% of gate count, 31.7% of critical path-delay and 44.1% of power consumption are achieved compared with the previous work.

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“…Hence, an alternative error detection method should be used when the proposed algorithm is applied in LTE systems. The NED criterion proposed in [7] can efficiently reduce the UER caused by CRC-aided OSD. The NED of the decoding output :0 with the minimum Euclidean distance is…”

Section: A Error Detection Without Crcmentioning

confidence: 99%

An improved decoding of tail-biting convolutional codes for LTE systems

Zhu

Jiang

2013

2013 International Conference on Wireless Communications and Signal Processing

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In this paper, we propose an improved decoding algorithm for tail-biting convolutional codes (TBCC), which combines the maximum a posteriori (MAP) algorithm and the ordered statistics decoding (OSD). The cyclic redundancy check (CRC) code used as a outer code in long term evolution (LTE) systems can be involved into the proposed decoding algorithm to get a better performance. Since CRC loses its ability of error detection in the proposed algorithm, an alternative detection method is employed to control undetected error rate (VER). A effective method to achieve the cancellation of CRC scrambling is also carried out, when the proposed decoding is applied into physical downlink control channel (PDCCH) and physical broadcast channel (PBCH) in LTE. Simulation results show that O.8-1.6dB performance gain is obtained with a negligible VER.

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A CRC-Aided Hybrid Decoding Algorithm for Turbo Codes

Cited by 15 publications

References 13 publications

An Efficient Polar Coding Scheme for Uplink Data Transmission in Narrowband Internet of Things Systems

An Efficient Polar Coding Scheme for Uplink Data Transmission in Narrowband Internet of Things Systems

Low‐complexity CRC‐aided early stopping unit for parallel turbo decoder

An improved decoding of tail-biting convolutional codes for LTE systems

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