AdaCode: Adaptive Codes in IEEE 802.11n Wireless Long-Distance Links

LIU Kang-ning; ZHAO Zeng-hua; WANG Yu

doi:10.3969/j.issn.0372-2112.2018.12.017

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AdaCode: Adaptive Codes in IEEE 802.11n Wireless Long-Distance Links

更新时间：2025-07-16

- AdaCode: Adaptive Codes in IEEE 802.11n Wireless Long-Distance Links
- Acta Electronica Sinica Vol. 46, Issue 12, Pages: 2942-2949(2018)
- 作者机构：
  
  天津大学智能与计算学部,天津,300350
- 作者简介：
- 基金信息：
  
  No.61172063, No.17JCYBJC15500)
- DOI：10.3969/j.issn.0372-2112.2018.12.017
  CLC： TN919.72
- Published Online：25 December 2018，
  
  Published：2018
- 稿件说明：
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LIU Kang-ning, ZHAO Zeng-hua, WANG Yu. AdaCode: Adaptive Codes in IEEE 802.11n Wireless Long-Distance Links[J]. Acta Electronica Sinica, 2018, 46(12): 2942-2949.
DOI：

LIU Kang-ning, ZHAO Zeng-hua, WANG Yu. AdaCode: Adaptive Codes in IEEE 802.11n Wireless Long-Distance Links[J]. Acta Electronica Sinica, 2018, 46(12): 2942-2949. DOI： 10.3969/j.issn.0372-2112.2018.12.017.

摘要

通过在实验床上的大量真实测量，分析了长距离无线链路中导致吞吐率低下的原因，总结了数据帧出错模式和丢包特点.在此基础上，提出了MAC（Media Access Control）层自适应编码算法AdaCode.该算法将帧间编码和帧内编码有机结合起来，帧间编码使用喷泉码LT（Luby Transform）码，帧内编码使用RS（Reed Solomon）码，根据链路中数据帧误比特率和丢包率的实时变化，动态选择最佳编码率，使接收端能够解码出所有数据帧，从而避免重传，极大提升了链路吞吐率.在MATLAB平台上实现了AdaCode，并使用实验床测得的真实数据进行仿真.仿真结果表明在固定物理层发送速率和可变发送速率两种情况下，AdaCode都能有效提升链路吞吐率.

Abstract

Through extensive measurements in our wireless long-distance network test-bed

we analyze fundamental reasons that cause low link throughput

and find characteristics of frame error pattern and loss rate. AdaCode is therefore proposed to improve link throughput

which is an adaptive coding algorithm at MAC (Media Access Control) layer. AdaCode integrates inter-coding and intra-coding algorithms

where inter-coding adopts LT (Luby Transform) codes to combat frame loss

whereas intra-coding uses RS (Reed Solomon) codes to recover corrupted frames. It chooses the optimal coding rate to decode all frames according to frame bit error rate and loss rate during transmission. When all frames are decoded

it is unnecessary to retransmit them

thus improving link throughput. We evaluate AdaCode via simulation in MATLAB using real-network trace. The simulation results show that AdaCode can improve link throughput efficiently at both fixed and variable physical-layer rate.

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