摘要
链路性能预测的核心是根据即时信道状态信息,准确地预测通信系统未来的传输差错概率。现有的LTE系统链路性能预测算法没有考虑速率匹配和自适应HARQ过程,因此其实用性受到限制。针对这一现状,本文以具有速率匹配和自适应HARQ通信模块的LTE系统为研究对象,提出了一种基于平均比特互信息的链路性能预测算法。该算法首先充分考虑速率匹配过程中比特重复对互信息的影响,利用符号重复率得到重复比特的解码增益;在此基础上,利用合并重传码块的平均比特互信息计算模型,得到整个系统中的信道编码码块比特平均互信息;最后利用加性高斯白噪声AWGN信道的仿真映射关系得到链路的误块率。仿真结果表明该算法均具有较高的准确性。
The purpose of Link Error Prediction is to predict the BLER of the link according to instant channel state. The existing Link Error Prediction model did not consider the rate matching and adaptive HARQ, this paper proposes a Link Error Prediction Method based on Mean Mutual Information per Bit, which firstly takes into account the Mean Mutual Information per Bit of repeated bits caused by rate matching and secondly presents a Mean Mutual Information per Bit calculation model for combined code block due to adaptive HARQ. Finally we can get the link performance from the mapping of Mean Mutual Information per Bit and BLER under the AWGN channel. Simulation results show that, the method proposed in this paper can predict the link performance accurately.
出处
《网络新媒体技术》
2013年第3期33-39,共7页
Network New Media Technology
基金
国家科技重大专项
2012ZX03001033基于用户体验的3G<E业务质量评测系统研发
自然科学基金项目
61201232
面向用户体验的IMT-Advanced系统跨层无线资源分配技术研究
关键词
LTE混合自动重传
链路性能预测
平均每比特互信息
LTE, Hybrid Automatic Repeat Request, Link Error Prediction, Mean Mutual Information per Bit
