Delayed bit interleaved coded modulation

Ma, Huixiao; Leung, W.K.; Yan, Xi; Law, K.W.; Fossorier, M.P.C.

doi:10.1109/istc.2016.7593082

Cited by 19 publications

(15 citation statements)

References 2 publications

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“…In BICM, a bit interleaver is inserted between the channel encoder and the modulation mapper to eliminate the correlation of coded bits mapped to the same modulation symbols. Recently, a variant of BICM called delayed BICM (DBICM) has been proposed [1]- [3]. DBICM outperforms the traditional BICM for certain constellations by taking advantage of the interblock memory [4] among multiple codewords [5].…”

Section: Introductionmentioning

confidence: 99%

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Delayed Bit Interleaved Coded Sparse Code Multiple Access

Mheich

Liu

Xiao

et al. 2020

IEEE Trans. Veh. Technol.

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Targeting to provide reliable short-packet communications with tens of bits in machine-type networks, we investigate a novel sparse code multiple access (SCMA) scheme called delayed bit-interleaved coded SCMA (DBIC-SCMA). At the transmitter side, a delay module is introduced between each channel encoder and SCMA mapper such that data bits from different channel codewords can be mapped to an identical SCMA codeword. We present the main components and principles for the transmitter of DBIC-SCMA, followed by a predecoding assisted receiver design which exploits systematic and rate-adaptive properties of certain channel codes. Our simulation results show that the proposed DBIC-SCMA leads to significant improvements in error rate performance over the classical BIC-SCMA scheme.

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Section: Introductionmentioning

confidence: 99%

“…It is shown in [5] that DBICM can achieve higher capacity than BICM at the expense of a slight increase in latency. In particular, DBICM can achieve significant gains over BICM for non-standard constellations where Gray labeling may not be applicable 1 . Simulation results in [5] show Copyright (c) 2015 IEEE.…”

Section: Introductionmentioning

confidence: 99%

Delayed Bit Interleaved Coded Sparse Code Multiple Access

Mheich

Liu

Xiao

et al. 2020

IEEE Trans. Veh. Technol.

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show abstract

“…To reduce the gap, an improved BICM scheme, namely delayed BICM (DBICM), was proposed in [ 20 ]. DBICM maps bits from multiple consecutive codewords to a transmit symbol, which introduces dependence among the codewords.…”

Section: Introductionmentioning

confidence: 99%

“…In [ 20 ], DBICM was verified to have a higher channel capacity and achieved about 0.7 dB and 0.5 dB gain over the corresponding BICM in eight-amplitude-shift keying (ASK) and half 16-QAM, respectively. It was pointed out in [ 20 ] that the labeling scheme is essential to DBICM design, the same as BICM [ 11 , 12 , 15 , 16 , 17 , 18 ]. However, different from BICM, delay pattern can also affect the performance of DBICM.…”

Section: Introductionmentioning

confidence: 99%

Design of a Labeling Scheme for 32-QAM Delayed Bit-Interleaved Coded Modulation

Zhang

Zhou

Du³

et al. 2020

Sensors

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It is very challenging to design the capacity-approaching labeling schemes for large constellations, such as 32-QAM, in delayed bit-interleaved coded modulation (DBICM). In this paper, we investigate the labeling design for 32-QAM DBICM with various numbers of bits delayed by one time slot. In particular, we aim to obtain the labeling schemes with a high DBICM channel capacity by searching the possible labeling schemes. To reduce the search space of the candidate labeling schemes, we propose the criteria that are necessary for good labeling. Based on the proposed criteria, a three-step search algorithm is proposed to obtain the candidate labeling efficiently. Numerical results demonstrate that the DBICM with our proposed labeling scheme can approach the capacity of 32-QAM within 0.015 dB at an information rate greater than 2.5 bits/symbol.

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“…Recently, a generalized BICM, namely, delayed-BICM (DBICM), was proposed in [11] to improve the transmission reliability over BICM. To be specific, DBICM modulates subblocks from multiple codewords and uses the decoded subblocks to improve the detection of other sub-blocks being modulated into the same signal sequence.…”

Section: Introductionmentioning

confidence: 99%

LDPC Code Design for Delayed Bit-Interleaved Coded Modulation

Liao

Yang

Yuan

et al. 2019

2019 IEEE Information Theory Workshop (ITW)

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This paper investigates the design and performance of delayed bit-interleaved coded modulation (DBICM) with lowdensity parity-check (LDPC) codes. For Gray labeled squareary quadrature amplitude modulation (QAM) constellations, we investigate the optimal delay scheme with the largest spectrum efficiency of DBICM for a fixed maximum number of delayed time slots and a given signal-to-noise ratio. When analyzing the capacity of DBICM, we find two important properties: the capacity improvement due to delayed coded bits being mapped to the real and imaginary parts of the transmitted symbols are independent of each other; a pair of delay schemes with delayed coded bits having identical bit-channel capacity lead to equivalent DBICM capacity. Using these two properties, we efficiently optimize the delay scheme for any uniform Gray-QAM systems. Furthermore, these two properties enable efficient LDPC code designs regarding unequal error protection via bit-channel type classifications. Moreover, we use protographbased extrinsic information transfer charts to jointly optimize degree distributions and channel assignments of LDPC codes and propose a constrained progressive edge growth like algorithm to jointly construct LDPC codes and bit-interleavers for DBICM, taking distinctive bit-channel's capacity into account. Simulation results demonstrate that the designed LDPC coded DBICM systems significantly outperform LDPC coded BICM systems.Index Terms-Low-density parity-check (LDPC) code, delayed bit-interleaved coded modulation (DBICM), bit-interleaved coded modulation (BICM).

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Delayed bit interleaved coded modulation

Cited by 19 publications

References 2 publications

Delayed Bit Interleaved Coded Sparse Code Multiple Access

Delayed Bit Interleaved Coded Sparse Code Multiple Access

Design of a Labeling Scheme for 32-QAM Delayed Bit-Interleaved Coded Modulation

LDPC Code Design for Delayed Bit-Interleaved Coded Modulation

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