摘要
分析了OFDM中用于可见光通信系统的信道估计方法,提出一种后处理离散傅里叶变换方法,在最大信道时延范围可以削弱噪音提高可见光系统性能。线性插入之后,信号经过离散傅里叶DFT变换到时域,由于最大信道时延的存在,信号会有一定的衰落,之后信号又会经过逆变换到频域。仿真算法使用的是最小二乘法LS,导频方式是梳状。不同的映射方法、不同的导频数目下的误码率BER性能也做出了比较。
This paper analyzes the channel estimation technique for OFDM（ Orthogonal Frequency Division Multiplexing） used in VLC（ Visible Light Communication system）. A post-processing DFT（ Discrete Fourier Transformation） channel estimation method was proposed to improve the system performance by eliminating the noise outside the maximum channel delay. After linear interpolation,the channel estimation is transformed into time domain by DFT and truncate according to the maximum channel delay,and then goes back to frequency domain. LS（ Least Square） algorithm with comb-type pilot is used in the simulation. The BER performance is demonstrated with QPSK,16-QAM and 64-QAM constellation order,also,the different pilot number is considered.
出处
《信息技术》
2015年第4期165-169,共5页
Information Technology
