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A bound on the rate of a system for encoding an unknown Gaussian autoregressive source

机译:编码未知高斯自回归源的系统的速率的界限

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摘要

To obtain the rate distortion function of an autoregressive (AR) source when the source parameters are fixed but unknown, it is common simply to insert the estimated parameters into the known-spectrum rate distortion expressions. This approach, although asymptotically correct, ignores any error in estimating the parameters, ignores distortion incurred by the need to encode the parameters for transmission to the receiver, and does not include a component for the side information. We derive a lower bound to the rate distortion performance of a relatively general system for encoding an unknown Gaussian AR source with respect to the mean-squared error (MSE) fidelity criterion. Asymptotically in the estimator frame length n and in the encoder blocklength N, the lower bound equals the usual Gaussian rate distortion function for small distortions.
机译:为了在源参数固定但未知的情况下获得自回归(AR)源的速率失真函数,通常只需将估计的参数插入到已知频谱速率失真表达式中。尽管渐近正确,但是该方法忽略了估计参数时的任何错误,忽略了由于需要编码参数以传输到接收器而引起的失真,并且不包括辅助信息的组成部分。我们推导了相对于均方误差(MSE)保真度准则对未知高斯AR源进行编码的相对通用系统的速率失真性能的下限。在估计帧长度n和编码器块长度N中,渐近线的下限等于小失真时通常的高斯率失真函数。

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