摘要
对信道的准确估计是提高相干解调的正交频分复用 (OFDM )系统性能的关键。利用在OFDM系统中信道的频域响应是过采样的特性 ,提出了在频域内用均匀梳状分布的导频符号和导频符号数相同点的傅里叶变换相结合的信道估计方法。在16QAMOFDM系统中将其与带低通滤波器的si (sin (x) /x)插值法、cubic插值法和Winner插值法进行了信道估计的均方误差和无编码的误比特率的仿真结果进行了比较 ,其结果表明本方法的估计性能优于si和cubic插值法 ,并接近优化的Winner插值法但其计算复杂度与Winner插值法相比却大大降低。
It is the key factor for a coherent OFDM system to estimate the channels accurately. Based on oversampling of OFDM frequency response, this paper proposes a channel estimator which combines the comb pilot tones partitioning and the Fourier transform with the same pilot symbol samples. Comparing with low pass filter of si(sin(x)/x) interpolator, cubic interpolator, and Winner interpolator in 16QAM OFDM system, both in mean square error and bit error rate without encoding, the results of the presented method show that the performance is better than si interpolator and cubic interpolator, and close to the Winner interpolator but white a much lower computing complexity.
出处
《电波科学学报》
EI
CSCD
2002年第6期628-632,共5页
Chinese Journal of Radio Science
