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Rateless Coded Uplink Transmission Design for Multi-User C-RAN.

Yu Zhang1,2, Jiali Xu1, Hong Peng3

  • 1College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China.

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|July 10, 2019
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Summary
This summary is machine-generated.

This study introduces a novel rateless coded transmission scheme for Cloud Radio Access Networks (C-RAN) supporting the Internet of Things (IoT). The optimized Raptor code scheme improves bit error rate and throughput, approaching theoretical limits without needing instant channel information.

Keywords:
C-RANblock fadingdegree profile optimizationrateless codeuplink transmission

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Area of Science:

  • Wireless Communication
  • Information Theory
  • Computer Networking

Background:

  • Cloud Radio Access Network (C-RAN) architecture separates remote radio heads (RRHs) and baseband units (BBUs) for centralized processing.
  • The Internet of Things (IoT) requires efficient and robust wireless communication technologies like C-RAN.
  • Uplink transmission in a two-user C-RAN under block fading channels presents challenges for overhead and performance.

Purpose of the Study:

  • To design and evaluate a novel rateless coded transmission scheme for a two-user C-RAN uplink.
  • To reduce system overhead by eliminating the need for instant channel state information at users.
  • To optimize the Raptor code degree profile for improved performance.

Main Methods:

  • A rateless coded transmission scheme using Raptor code is proposed.
  • Quantizers at RRHs and belief propagation (BP)-based iterative multiuser detector/decoder at the BBU pool are designed.
  • Extrinsic Information Transfer (EXIT) analysis is used to optimize the Raptor code output node degree profile.

Main Results:

  • The proposed scheme allows users to transmit until an acknowledgement (ACK) is received, reducing overhead.
  • Optimized degree profiles for Raptor codes outperform benchmark profiles.
  • Simulation results demonstrate significant improvements in bit error rate and average system throughput.

Conclusions:

  • The novel rateless coded transmission scheme offers superior performance in C-RAN uplink scenarios.
  • The optimized Raptor code degree profiles achieve near-theoretical performance limits.
  • This approach enhances C-RAN efficiency for IoT applications.