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arXiv 2203.12467cs.ITcs.SYeess.SPeess.SYmath.ITmath.OC
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共享随机线性二次高斯变长信源编码的一个下界

A Lower-bound for Variable-length Source Coding in Linear-Quadratic-Gaussian Control with Shared Randomness

Travis C. Cuvelier, Takashi Tanaka, Robert W. Heath

摘要:

在这封信中,我们考虑一个线性二次高斯(LQG)控制系统,反馈发生在一个无噪声的二进制信道,并获得最低限度的通信成本(通过信道比特率量化),以达到一个给定的控制性能所需的下限。我们假设,在每个时间步长,编码器可以通过信道将包含可变比特数的分组传送到控制器处的解码器。我们的系统模型提供了编码器和解码器共享随机性的可能性,就像使用抖动量化器的系统中的情况一样。我们定义了两个极端的无前缀的要求,可能会施加在消息包,这样的约束是有用的,因为它们允许解码器,并可能其他代理唯一地识别在一个在线的方式传输的结束。然后,我们推导出一个下界的无前缀编码的有向信息的速率,特别是我们表明,以前已知的绑定仍然保持在共享的随机性的情况下。我们概括了前缀约束放松时的界限,并得出结论与率失真制定。

英文摘要:

In this letter, we consider a Linear Quadratic Gaussian (LQG) control system where feedback occurs over a noiseless binary channel and derive lower bounds on the minimum communication cost (quantified via the channel bitrate) required to attain a given control performance. We assume that at every time step an encoder can convey a packet containing a variable number of bits over the channel to a decoder at the controller. Our system model provides for the possibility that the encoder and decoder have shared randomness, as is the case in systems using dithered quantizers. We define two extremal prefix-free requirements that may be imposed on the message packets; such constraints are useful in that they allow the decoder, and potentially other agents to uniquely identify the end of a transmission in an online fashion. We then derive a lower bound on the rate of prefix-free coding in terms of directed information; in particular we show that a previously known bound still holds in the case with shared randomness. We generalize the bound for when prefix constraints are relaxed, and conclude with a rate-distortion formulation.

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