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arXiv 1102.3214cs.ITmath.ITmath.OC
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高斯广播信道的反馈LQG控制方法

LQG Control Approach to Gaussian Broadcast Channels with Feedback

Ehsan Ardestanizadeh, Paolo Minero, Massimo Franceschetti

摘要:

本文提出了一种在k个接收机加性高斯白噪声广播信道上进行反馈通信的编码,并利用线性二次型高斯最优控制理论对该编码进行了分析。结果表明,该码的性能取决于接收端的噪声相关性,并且与离散代数Riccati方程的解有关。对于独立噪声的情况,由所提出的码实现的满足平均功率约束P的和速率被表征为1/2log(1+P*phi),其中区间[1,k]中的系数“phi”量化由于反馈的存在而导致的功率增益。当专门针对两个接收器的情况时,这包括Elia以前的结果,并严格改进了Ozarow和Leung的代码。当噪声相关时,有反馈的广播信道的和容量的前对数可以严格大于1。它是建立,对于所有的噪声协方差矩阵的秩r的和容量的前对数是最多k-r+1,相反,存在一个噪声协方差矩阵的秩r的建议的代码达到这个上限。这概括了Gastpar和Wigger以前的两个接收器广播信道的结果。

英文摘要:

A code for communication over the k-receiver additive white Gaussian noise broadcast channel with feedback is presented and analyzed using tools from the theory of linear quadratic Gaussian optimal control. It is shown that the performance of this code depends on the noise correlation at the receivers and it is related to the solution of a discrete algebraic Riccati equation. For the case of independent noises, the sum rate achieved by the proposed code, satisfying average power constraint P, is characterized as 1/2 log (1+P*phi), where the coefficient "phi" in the interval [1,k] quantifies the power gain due to the presence of feedback. When specialized to the case of two receivers, this includes a previous result by Elia and strictly improves upon the code of Ozarow and Leung. When the noises are correlated, the pre-log of the sum-capacity of the broadcast channel with feedback can be strictly greater than one. It is established that for all noise covariance matrices of rank r the pre-log of the sum capacity is at most k-r+1 and, conversely, there exists a noise covariance matrix of rank r for which the proposed code achieves this upper bound. This generalizes a previous result by Gastpar and Wigger for the two-receiver broadcast channel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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