Jittered sampling in linear canonical domain

Jittered sampling in linear canonical domain
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线性规范域中的抖动采样

DOI:
10.1109/lcomm.2020.2988947
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发表时间:
2020-04
期刊:
IEEE Communications Letters
影响因子:
--
通讯作者:
Zhichao Zhang
Zhichao Zhang
中科院分区:
其他
文献类型:
--
作者:
Zhichao Zhang

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基于线性正则变换(LCT)的采样方法在信号处理领域受到了广泛的关注.因此,各种采样定理与LCT的推导。然而,在线性正则域中的随机抖动采样仍然没有得到解决。从LCT的Shannon结果出发,提出了一种带限信号在线性正则域中的有偏插值估计。然后应用逆滤波器技术来校正偏差,从而产生无偏估计器,其内插噪声方差随着抖动变得越来越不明显而接近于零。具体地说,对于线性正则域中的带限平稳随机信号,插值噪声方差增大,这一结果也通过一些例子和仿真得到了验证。
Linear canonical transform (LCT) based sampling has been attracted much attention in signal processing community. A variety of sampling theorems associated with the LCT are therefore derived. However, the random jittered sampling in linear canonical domain still remains unresolved. Starting from the Shannon's result for the LCT, a biased interpolated estimate for bandlimited signals in linear canonical domain from jittered samples is proposed. The inverse filter technique is then applied to correct the bias, giving rise to an unbiased estimator whose interpolation noise variance approaches zero as the jitter becomes less and less pronounced. To be specific, for bandlimited stationary stochastic signals in linear canonical domain the interpolation noise variance is increased, and this result is also verified through some examples and simulations.
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