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Incremental redundancy low-density parity-check codes for hybrid FEC/ARQ schemes.

机译：用于混合FEC / ARQ方案的增量冗余低密度奇偶校验码。

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摘要

The objective of this dissertation is to investigate incremental redundancy low-density parity-check (IR-LDPC) codes for hybrid forward error correction/automatic repeat request (HybridARQ) schemes. Powerful capacity-approaching IR-LDPC codes are one of the key functional elements in high-throughput HybridARQ schemes and provide a flexible rate-compatible structure, which is necessary for low-complexity HybridARQ schemes.; This dissertation first studies the design and performance evaluation of IR-LDPC codes, which have good error rate performance at short block lengths. The subset codes of the IR-LDPC codes will be compared to conventional random punctured codes and multiple dedicated codes. This step is necessary for designing IR-LDPC codes because throughput performance of HybridARQ schemes strongly depends on the error rate performance of a subset of IR-LDPC codes. As a system model for this work, an adaptive LDPC coded system is presented. This adaptive system can confront the nature of time-varying channels and approach the capacity of the system with the aid of LDPC codes. This system shows remarkable throughput improvement over a conventional punctured system and, for systems that use multiple dedicated codes, provides comparable performance with low-complexity at every target error rate.; This dissertation also focuses on IR-LDPC codes with a wider operating code range because the previous IR-LDPC codes exhibited performance limitation related to the maximum achievable code rate. For this reason, this research proposes a new way to increase the maximum code rate of the IR-LDPC codes, which provides throughput improvement at high throughput regions over conventional random punctured codes. Also presented is an adaptive code selection algorithm using threshold parameters. This algorithm reduces the number of the unnecessary traffic channels in HybridARQ schemes.; This dissertation also examines how to improve throughput performance in HybridARQ schemes with low-complexity by exploiting irregular repeat accumulate (IRA) codes. The proposed adaptive transmission method with adaptive puncturing patterns of IRA codes shows higher throughput performance in all of operating code ranges than does any other single mode in IR-HybridARQ schemes.
机译：本文的目的是研究用于混合前向纠错/自动重发请求（HybridARQ）方案的增量冗余低密度奇偶校验（IR-LDPC）码。强大的接近容量的IR-LDPC码是高吞吐量HybridARQ方案中的关键功能元素之一，并提供了灵活的速率兼容结构，这是低复杂度HybridARQ方案所必需的。本文首先研究了IR-LDPC码的设计和性能评估，该码元在短块长度下具有良好的误码率性能。 IR-LDPC码的子集码将与常规随机删余码和多个专用码进行比较。这是设计IR-LDPC码所必需的步骤，因为HybridARQ方案的吞吐性能很大程度上取决于IR-LDPC码子集的误码率性能。作为这项工作的系统模型，提出了一种自适应LDPC编码系统。这种自适应系统可以面对时变信道的性质，并借助LDPC码达到系统的容量。与传统的穿孔系统相比，该系统显示出显着的吞吐量提高，并且对于使用多个专用代码的系统，在每个目标错误率下均具有相当低的复杂度，并且具有可比的性能。由于以前的IR-LDPC码表现出与最大可实现码率有关的性能限制，因此本文也将重点放在具有较宽操作码范围的IR-LDPC码上。因此，本研究提出了一种提高IR-LDPC码最大码率的新方法，与传统的随机删余码相比，该方法可提高高吞吐量区域的吞吐量。还提出了一种使用阈值参数的自适应代码选择算法。该算法减少了HybridARQ方案中不必要的业务信道的数量。本文还研究了如何通过利用不规则重复累加（IRA）码来提高低复杂度HybridARQ方案的吞吐性能。与IR-HybridARQ方案中的任何其他单一模式相比，所提出的具有IRA码自适应穿孔模式的自适应传输方法在所有操作码范围内均显示出更高的吞吐性能。

著录项

  • 作者

    Hur, Woonhaing.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 125 p.
  • 总页数 125
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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