Related Experiment Video
Updated: Sep 18, 2025

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Layered HARQ Design for LDPC-Based Multi-Level Coded Modulation
Yuejun Wei1, Yue Chen1, Chunqi Chen2
1School of Computer and Information Engineering, Shanghai Polytechnic University, Shanghai 201209, China.
Abstract:
Multi-level coded modulation (MLCM) enhances data transmission by allocating error correction more effectively to bits with higher error probabilities, thus optimizing redundancy and improving performance. Despite MLCM's advantages over traditional bit-interleaved coded modulation (BICM) systems in certain scenarios, its integration with hybrid automatic repeat request (HARQ) systems remains underexplored. HARQ, which combines the benefits of forward error correction (FEC) and automatic repeat request (ARQ), significantly increases resilience to interference and fading, enhancing overall system reliability. This paper bridges the gap by integrating HARQ techniques into the MLCM framework, which was specifically adapted to the layered nature of MLCM. We present tailored hybrid retransmission strategies for each layer of MLCM, demonstrating substantial gains in retransmission efficiency and overall transmission performance.
Related Concept Videos
Design Example
Design Example: Capacitance Multiplier Circuit
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Bewley Lattice Diagram
LC Circuits
Design Example: Underdamped Parallel RLC Circuit
Starting with a fixed...
Transmission Line Design Considerations

