【作者】 姚元； 郑剑锋； 冯正和；

【Author】 YAO Yuan;ZHENG Jian-feng;FENG Zheng-he;Department of Electronic Engineering, Tsinghua University;

【机构】 清华大学电子工程系；

【摘要】 提出了一种基于chirp信号的多输入多输出(multiple input multiple output,MIMO)信道频域测量方法。利用chirp信号幅度谱均匀集中于带宽之内的特点,通过快速傅里叶变换(fastfouriertransform,FFT)及其反变换分别获得信道的频率响应和冲击响应。在采用开关切换式天线阵列的情况下,该方法简化了传统基于chirp信号的MIMO信道测量仪的接收机结构,降低了对chirp信号线性度的要求,节约了系统成本。仿真结果验证了理论推导的正确性,同时表明该方法在测量精度上与传统方法相当。更多还原

【Abstract】 A frequency-domain method for multiple input multiple output(MIMO)channel sounding based on chirp signal is proposed. Since the amplitude spectrum of chirp signal is uniformly concentrated to the band of interest, the channel frequency response and impulse response can be obtained through fast fourier transform(FFT)and its inverse transform, respectively. In the case of employing switched arrays, the proposed method can simplify the receiver structure of conversional MIMO chirp sounder and relax the demand on the linearity of chirp signal, therefore reduce the system cost. Simulation results show the correctness of the theoretical derivation, and demonstrate that the proposed method has comparable sounding accuracy to the conversional method.更多还原