文档介绍：超宽带脉冲信号的一种频域采样和接收方法*
杨峰蒋祥顺胡剑浩李少谦
(电子科技大学通信抗干扰技术国家重点实验室, 成都 610054)
摘要: 对纳秒级的超宽带脉冲信号进行采样需要设计采样速率高达数十GHz, 且必须具有较低功耗的超高速模数变换器,提出了一种频域模数变换的方法, 使超宽带脉冲信号通过一个频域滤波器组, 并采用一组低速模数变换器在频域对脉冲信号并行采样, 大大地降低了接收机对前端模数变换器采样速率的要求。并给出了频域同步、频域信道估计和频域解调的设计算法, 计算机仿真结果证明了在能够大大降低采样速率的情况下, 频域采样超宽带脉冲通信接收机具有和传统时域高速采样接收机相近的误码率性能。
关键词: 超宽带; 频域采样; 模数变换器; 滤波器组
中图分类号: TN92 文献标识码: A 国家标准学科分类代码:
Frequency domain sampling and receiving method
for ultla-wideband pulse signal
Yang Feng Jiang Xiangshun Hu Jianhao Li Shaoqian
(National Key Lab. m., University of Electronic Sci. &Tech. of China, Chengdu 610054, China)
Abstract: The most challengeable job in the design of digital UWB receiver is the design of an ultra-high speed ADC in the order of tens of gigahertz with low power consumption. In this paper, a frequency domain parallel sampling method is proposed, which can greatly reduce the ADC sampling speed. The frequency domain ADCs posed of analog filter banks followed by lower speed ADCs. The analog filter banks can be implemented using simple bi-quad filters. Therefore, the digital UWB receiver can be easily implemented in CMOS technology of plexity. Frequency domain synchronization, channel estimation and demodulation algorithms are also provided. The simulation results show that under much lower sampling speed, the frequency domain UWB receiver can achieve BER parable with conventional high