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arXiv 1004.4308cs.ITmath.ITstat.AP
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用于模拟-信息转换的分段压缩采样:方法和性能分析

Segmented compressed sampling for analog-to-information conversion: Method and performance analysis

Omid Taheri, Sergiy A. Vorobyov

摘要:

提出了一种新的用于模拟-信息转换(AIC)的分段压缩采样方法。首先将由混频器和积分器(BMI)的多个并行分支测量的模拟信号在时间上分段为$M$段,每个分支的特征在于特定的随机采样波形。然后,重复使用在不同段和不同BMI上收集的子样本,使得收集比BMI的数量更大数量的样本。这种技术被证明是等效于扩展的测量矩阵,其中包括BMI采样波形,通过添加新的行,而实际上没有增加BMI的数量。证明了当BMI采样波形的原始测量矩阵满足约束等距性时,扩展测量矩阵以压倒性的概率满足约束等距性,并证明了用我们的分段AIC代替传统AIC进行采样可以显著提高信号恢复性能.仿真结果验证了分段压缩采样方法的有效性和理论研究的正确性。

英文摘要:

A new segmented compressed sampling method for analog-to-information conversion (AIC) is proposed. An analog signal measured by a number of parallel branches of mixers and integrators (BMIs), each characterized by a specific random sampling waveform, is first segmented in time into $M$ segments. Then the sub-samples collected on different segments and different BMIs are reused so that a larger number of samples than the number of BMIs is collected. This technique is shown to be equivalent to extending the measurement matrix, which consists of the BMI sampling waveforms, by adding new rows without actually increasing the number of BMIs. We prove that the extended measurement matrix satisfies the restricted isometry property with overwhelming probability if the original measurement matrix of BMI sampling waveforms satisfies it. We also show that the signal recovery performance can be improved significantly if our segmented AIC is used for sampling instead of the conventional AIC. Simulation results verify the effectiveness of the proposed segmented compressed sampling method and the validity of our theoretical studies.

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