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arXiv 0710.5376cs.ITmath.IT
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广播相关高斯

Broadcasting Correlated Gaussians

Shraga Bross, Amos Lapidoth, Stephan Tinguely

摘要:

我们考虑在平均功率受限的一对二高斯广播信道上传输无记忆的二元高斯源。发射机观察源,并通过平均功率约束信号将其描述给两个接收机。每个接收机观测到被不同的加性高斯白噪声破坏的发射信号,并且希望估计针对它的源分量。也就是说,接收机1希望估计第一源分量,接收机2希望估计第二源分量。我们的兴趣是在预期的平方误差失真,同时实现在两个接收器的对。我们证明了一个未编码的传输方案,发送源组件的线性组合,实现了最佳的功率与失真的权衡时,信号噪声比低于一定的阈值。该阈值是源相关性和接收机处具有较弱噪声的失真的函数。

英文摘要:

We consider the transmission of a memoryless bivariate Gaussian source over an average-power-constrained one-to-two Gaussian broadcast channel. The transmitter observes the source and describes it to the two receivers by means of an average-power-constrained signal. Each receiver observes the transmitted signal corrupted by a different additive white Gaussian noise and wishes to estimate the source component intended for it. That is, Receiver~1 wishes to estimate the first source component and Receiver~2 wishes to estimate the second source component. Our interest is in the pairs of expected squared-error distortions that are simultaneously achievable at the two receivers. We prove that an uncoded transmission scheme that sends a linear combination of the source components achieves the optimal power-versus-distortion trade-off whenever the signal-to-noise ratio is below a certain threshold. The threshold is a function of the source correlation and the distortion at the receiver with the weaker noise.

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