摘要
针对在卫星高速移动信道中传输SOFDM数据符号时受到较大的多普勒频偏干扰这一问题,研究并提出了一种通过直接校正数据符号的相位误差来抑制多普勒频偏的方法。对时域导频符号的相位按照一定的规则进行补偿,然后对补偿后的导频相位进行线性插值来估计并校正数据符号的相位误差;理论分析表明,这种方法的计算复杂度较低,易于实现,并且占用的SOFDM系统资源仅为0.049%,便于工程应用;仿真结果表明,这种方法能够在速度为500km/h并且CIR接近0dB的高速移动环境下准确校正U分布峰值为1000Hz的大多普勒频偏引起的相位误差,进而使系统的误比特率(BER)降低到10-4量级,比普通系统的误码性能提高了两个数量级。
A time domain pilot＇s phase compensation based phase error correction method was schemed and proposed, for dealing with the severe doppler spread to SOFDM symbols in satellite mobile communications with high-speed environments. First, phases of the time domain pilots were compensated in terms of certain rule and regulation. Afterwards, phase errors of the SOFDM symbols were estimated and corrected via applying the piecewise linearity interpolation to the adjusted phases of the pilots. According to the theoretical analysis, it only wastes 0. 049 percent of system resource, and considering of such lower computational complexity, it can be simply carried out. Besides, the experimental results have also proved that it is able to correct the phase errors caused by severe doppler spread on a peak value of 1000Hz under the U- type distribution, with a high-speed environment of 500km/h as well as a low CIR of nearly 0dB. As a result, the system BER is depressed to 1e-4 as an improved performance, which is about 100 times remarkably better than that of other ordinary systems.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第5期1985-1991,共7页
Journal of Astronautics
基金
航天"十一五"预研课题项目
