| WiMAX系统中导频和信道估计 |
| |
| 引用本文： | 刘光毅,王勇,张建华. WiMAX系统中导频和信道估计[J]. 中兴通讯技术, 2007, 13(5): 48-52 |
| |
| 作者姓名： | 刘光毅 王勇 张建华 |
| |
| 作者单位： | 中国移动通信有限公司研究院 北京100053(刘光毅)，北京邮电大学无线新技术研究所 北京100876(王勇，张建华) |
| |
| 摘 要： | WiMAX系统中物理层多址方案采用了正交频分多址接入(OFDMA),并根据上、下行链路的不同特点,定义了多种导频图案。当OFDMA和多输入多输出(MIMO)技术结合时,导频图案也需要变化来支持多天线。WiMAX系统中MIMO-OFDMA有五种导频模式,包括下行部分使用子信道(DL-PUSC)、下行完全使用子信道(DL-FUSC)、下行可选完全使用子信道(DL-OFUSC)、上行部分使用子信道(UL-PUSC)和上行可选部分使用子信道(UL-OPUSC)。通过分析时域LS、频域LS和基于FFT的信道估计方法下的仿真结果,可以得出每种模式下的最优信道估计方案。
|
| 关 键 词： | 导频 信道估计 |
| 文章编号： | 1009-6868（2007）05-0048-05 |
| 收稿时间： | 2007-04-10 |
| 修稿时间： | 2007-04-10 |
Pilot and Channel Estimation for WiMAX System |
| |
| LIU Guang-yi,WANG Yong,ZHANG Jian-hua. Pilot and Channel Estimation for WiMAX System[J]. ZTE Communications, 2007, 13(5): 48-52 |
| |
| Authors: | LIU Guang-yi WANG Yong ZHANG Jian-hua |
| |
| Affiliation: | 1. Research Institute of China Mobile Communications Corporation, Beijing 100053 China; 2. WTI, Beijing University of Posts and Telecommunications, Beijing 100876, China |
| |
| Abstract: | Orthogonal Frequency Division Multiple Access (OFDMA) technique is adopted in WiMAX system, and the different pilot patterns are defined for both uplink and downlink channels. Pilot pattern should be changed, especially when Multiple Input Multiple Output (MIMO) technique is combined with OFDMA, in order to support multiple antennas. There are five kinds of pilot patterns in WiMAX-MIMO-OFDMA system, namely, Downlink-Partially Used Sub-Channel (DL-PUSC), Downlink-Fully Used Sub-Channel (DL-FUSC), Downlink-Optional Fully Used Sub-Channel (DL-OFUSC), Uplink-Partially Used Sub-Channel (UL-PUSC) and Uplink-Optional Partially Used Sub-Channel (UL-OPUSC). Moreover, by analyzing the simulation results of time domain Least Square (LS), frequency domain LS, and Fast Fourier Transform (FFT)-based channel estimation algorithms, the best pilot pattern can be found. |
| |
| Keywords: | WiMAX OFDM MIMO |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
