Vector Gaussian Multiple Description With Two Levels of Receivers
Vector Gaussian Multiple Description With Two Levels of Receivers
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DOI：
10.1109/tit.2008.2008146
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发表时间：
2009-01-01
影响因子：
2.5
通讯作者：
Viswanath, Pramod
中科院分区：
文献类型：
--
作者：
Wang, Hua;Viswanath, Pramod
研究了具有两级接收机的平稳遍历高斯源的L重描述问题。每个第一级接收器接收L个描述中的k个（任意子集），（k < L）。第二级接收器接收所有L个描述。所有的接收器，无论是在第一级和第二级，重建源使用的子集，他们收到的描述。相应的重建受到二次失真约束。我们的主要结果是推导出描述的总和速率的外界，以便满足失真约束。我们表明，一个模拟-数字分离架构，涉及联合高斯矢量量化器和一个分仓方案满足这个外边界与平等的几种情况。这些场景包括失真约束对称的情况以及k = 2和L = 3的一般失真约束的情况。
The problem of L multiple descriptions of a stationary and ergodic Gaussian source with two levels of receivers is investigated. Each of the first-level receivers receive (an arbitrary subset) k of the L descriptions, (k < L). The second-level receiver receives all L descriptions. All the receivers, both at the first level and the second level, reconstruct the source using the subset of descriptions they receive. The corresponding reconstructions are subject to quadratic distortion constraints. Our main result is the derivation of an outer bound on the sum rate of the descriptions so that the distortion constraints are met. We show that an analog-digital separation architecture involving joint Gaussian vector quantizers and a binning scheme meets this outer bound with equality for several scenarios. These scenarios include the case when the distortion constraints are symmetric and the case for general distortion constraints with k = 2 and L = 3.