一种基于LTE-A的联合自适应传输方法  

A Hybrid AdaptiveTransmission Method Based on LTE-A

作　　者：田攀[1] 芮赟[2] 李明齐[2] 郑敏[1] 卜智勇[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]中国科学院上海高等研究院,上海201210

出　　处：《计算机工程》2012年第23期75-78,共4页Computer Engineering

基　　金：国家"十一五"重大专项基金资助项目(2009ZX03003 006 03);上海市自然科学基金资助项目(10ZR1436000);国家广电总局科研基金资助项目(2011 28)

摘　　要：LTE A上行每帧数据在自适应传输时,不能实时切换为分簇的DFT S OFDM和N×SC FDMA系统。为此,提出一种联合自适应调制编码方法。该方法依据接收端的信干噪比,分别预测下一帧在采用分簇的DFT S OFDM和N×SC FDMA进行自适应传输时的吞吐量,选择吞吐量大的系统及相应的调制编码方式在下一帧使用,可获得分簇的DFT S OFDM和N×SC FDMA系统在自适应传输时频谱效率的联合性能。仿真结果表明,与单一自适应系统相比,该方法在多径信道下的吞吐量性能能够取得1 dB增益。Aiming at the problem that each frame cannot switch the system between DFT S OFDM and N×SC FDMA in real time adaptive transmission of LTE A’s uplink,a hybrid Adaptive Modulation and Coding（AMC） method is proposed.According to SINR,the method predicts the throughput of DFT OFDM and N×SC FDMA in the situation of adaptive transmission,and chooses the system which has greater throughput and the corresponding MCS for the next frame.This method obtains the hybrid performance of spectrum efficiency of DFT OFDM and N×SC FDMA in adaptive transmission.Simulation results show that this method can get 1 dB gain in the aspect of throughput performance,compared with the single adaptive transmission system.

关 键 词：离散傅里叶变换扩频的正交频分复用 单载波频分多址 信干噪比 自适应传输 自适应调制编码 吞吐量 

分 类 号：TN911.3[电子电信—通信与信息系统]