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首页> 外文期刊>Circuits, systems and signal processing >A Compressed Sampling Receiver Based on Modulated Wideband Converter and a Parameter Estimation Algorithm for Fractional Bandlimited LFM Signals
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A Compressed Sampling Receiver Based on Modulated Wideband Converter and a Parameter Estimation Algorithm for Fractional Bandlimited LFM Signals

机译：基于调制宽带转换器的压缩采样接收器和分数带状LFM信号的参数估计算法

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摘要

A modified modulated wideband converter (MWC)-based compressed sampling receiver and a parameter estimation algorithm in discrete time fractional Fourier domain (DTFrFD) to intercept and estimate the fractional bandlimited LFM signals are suggested in this work. Our proposed compressed sampling receiver has some advantages compared to the original MWC-based compressed sampling receiver. Firstly, the proposed receiver works in DTFrFD which is more effective to intercept the fractional bandlimited signals, while the original MWC-based digital receiver works in discrete time Fourier domain (DTFD). Secondly, the cross-channel signal can get better separation by the proposed digital receiver than by original MWC-based receiver because that the nonzero part of the signal's available spectrum is narrower in DTFrFD than in DTFD. Then, with the data acquired from the digital receiver, we propose a novel parameter estimation algorithm for the intercepted fractional bandlimited LFM signal based on OMP and the differentiation spectrum in DTFrFD. The initial frequency and final frequency of the intercepted fractional bandlimited LFM signal can be extracted successfully without two-dimensional search and reconstruction, and only two iterations are needed according the algorithm. Both theoretical analysis and simulation results demonstrate that the proposed algorithm bears a relatively low complexity and its estimation precision is not only higher than both DFrFT-based search algorithm and DFrFT-based reconstruction algorithm but also close to Cramer-Rao lower bound.
机译：在该工作中提出了一种改进的调制宽带转换器（MWC）基础的压缩采样接收器和离散时间分数傅里叶域（DTFRFD）的参数估计算法以拦截和估计分数带限LFM信号。与基于MWC的压缩采样接收器相比，我们所提出的压缩采样接收器具有一些优点。首先，所提出的接收器在DTFRFD中工作，该DTFRFD可以更有效地拦截分数带限制的信号，而基于原始的MWC的数字接收器在离散时间傅里叶域（DTFD）工作。其次，交叉信道信号可以通过所提出的数字接收器更好地分离，而不是由原始的MWC基接收器分离，因为信号可用频谱的非零部分在DTFRFD中比在DTFD中较窄。然后，利用从数字接收器获取的数据，我们提出了一种基于DTFRFD中的截取的分数带状LFM信号的新颖参数估计算法。可以在没有二维搜索和重建的情况下成功提取截获的分数带限制的LFM信号的初始频率和最终频率，并且仅根据算法仅需要两个迭代。理论分析和仿真结果表明，所提出的算法具有相对较低的复杂性，其估计精度不仅高于基于DFRFT的搜索算法和基于DFRFT的重建算法，而且还接近Cramer-Rao下限。

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