摘要
基于在不同的天线上发送时间正交的训练序列,提出了一种多天线OFDM系统前导结构,用于实现时间、频率突发同步方案,并可以用于信道估计。所提出算法的特点一是计算复杂度低;二是对OFDM符号累加求平均,可以提高同步精度;三是对LS信道估计的时域值进行截断,显著提高了噪声环境下的信道估计精度。
The paper first introduces a training sequence which transmits time orthogonally between different antennas, on the basis of which it presents a preamble structure for the multi - antenna OFDM system, which can realize time and frequency burst synchronization and be applied to channel estimation. The proposed algorithm has low computational complexity. It accumulates the OFDM system to obtain the average, which increases the synchronization precision, and interrupts the time domain value of LS channel estimation, which also greatly increases the estimation precision. The simulation results have verified the merits above and thus the scheme is of great practical value.
出处
《电子科技》
2007年第1期4-7,16,共5页
Electronic Science and Technology
关键词
多天线
OFDM
频率
同步
信道估计
multi - antenna
OFDM
frequency
synchronization
channel estimation
