用于视频传输的自适应分级正交幅度调制不等保护方法

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用于视频传输的自适应分级正交幅度调制不等保护方法

更新时间：2025-07-09

- 用于视频传输的自适应分级正交幅度调制不等保护方法
- Issue 4, Pages: 72-76+99(2011)
- 作者机构：
  
  西安电子科技大学综合业务网理论及关键技术国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919.8
- Online First：10 April 2011，
  
  Published：2011
- 稿件说明：
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[J]. 2011, (4): 72-76+99.
DOI：

[J]. 2011, (4): 72-76+99. DOI：

摘要

针对已有用于无线视频传输不等保护的分级正交幅度调制(HQAM)不能适应无线信道时变特性和频率选择性的问题

提出一种自适应HQAM不等保护方法(A-HQAM).首先将视频码流按其对恢复视频质量的重要性划分出不同的优先级

然后根据优先级不同数据允许的误码率上限和子载波信道质量

自适应确定对应的HQAM调制参数

最后将视频数据调制到各子载波上实现不等保护传输.与已有同类方法相比

A-HQAM方法可减小无线信道时变特性和频率选择性的影响

改善恢复视频质量.仿真结果表明

相比基于HQAM的不等保护方法

A-HQAM方法可使恢复视频质量平均提高1dB.

Abstract

An unequal error protection(UEP)method for video transmission using adaptive hierarchical quadrature amplitude modulation(A-HQAM)is proposed to reduce the impact of frequency-selective fading and the time-varying nature of wireless channels. Firstly

the video streams are divided into sub-streams with unequal priorities. Then

the HQAM modulation parameters of each sub-carrier are adaptively determined based on the channel quality of each sub-carrier and the upper limit of the bit error rate of the sub-streams with unequal priorities. Finally

UEP is implemented via modulating video streams onto sub-carriers. Simulation results show that the proposed A-HQAM method reduces the impact of frequency-selective fading and the time-varying nature of the wireless channels

and improves the quality of the reconstructed video by an average of 1 dB compared with HQAM-based methods.

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