Abstract
In this paper, a joint early stopping criterion based on cross entropy (CE), named joint CE criterion, is presented for double-protograph low-density parity-check (DP-LDPC) codes-based joint source-channel coding (JSCC) systems in images transmission to reduce the decoding complexity and decrease the decoding delay. The proposed early stopping criterion adopts the CE from the output likelihood ratios (LLRs) of the joint decoder. Moreover, a special phenomenon named asymmetry oscillation-like convergence (AOLC) in the changing process of CE is uncovered in the source decoder and channel decoder of this system meanwhile, and the proposed joint CE criterion can reduce the impact from the AOLC phenomenon. Comparing to the counterparts, the results show that the joint CE criterion can perform well in the decoding complexity and decoding latency in the low–moderate signal-to-noise ratio (SNR) region and achieve performance improvement in the high SNR region with appropriate parameters, which also demonstrates that this system with joint CE is a low-latency and low-power system.
Highlights
As the most challenging application scenario of the fifth-generation wireless communication, the ultra-reliable low-latency communications (URLLC) need to meet the latency requirement of 1 ms or less [1]
If the probability of binary ‘1’ of one frame is less than this threshold, this frame will be processed by the double-protograph low-density parity-check (DP-low-density parity-check (LDPC)) joint source and channel coding (JSCC) system; otherwise, it will be processed by protograph LDPC (P-LDPC) channel codes without source coding
The oscillation phenomenon in DP-LDPC JSCC system, which we call asymmetry oscillationlike convergence (AOLC), is unique in this system and different from separated source channel coding (SSCC) system, whose ratio stably decreases in the whole signal-to-noise ratio (SNR) region
Summary
As the most challenging application scenario of the fifth-generation wireless communication, the ultra-reliable low-latency communications (URLLC) need to meet the latency requirement of 1 ms or less [1]. Different from the purpose of scheduling methods to decrease the iteration numbers efficiently [14,21,22], early stopping criterions can avoid the unnecessary iterations in the low-moderate signal-to-noise ratio (SNR) region [23,24,25]. The existing stopping criterions are mostly designed for turbo codes and LDPC codes, which are used in separated source channel coding (SSCC) systems. We design a joint CE stopping criterion for DP-LDPC JSCC system in image transmission, which considers the matching relationship between the source decoder and channel decoder. JSCC system to avoid unnecessary iterations and the specific properties of the joint decoder are well considered It can efficiently reduce the decoding complexity and lower decoding latency in low-moderate SNR region and achieve better performance in the high SNR region with appropriate parameters, compared to its counterparts.
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