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The impact of feedback noise on digital predistortion with intuitive direct learning is investigated. The noise leads to an extra NMSE, which is NMSEη = 1\Gp(1-|1-θ|2). σn2\Py. Processing gain Gp is the ratio of block size to the number of coefficients, θ is the approximation of the first order derivative for PA functions and py\σn2 is the SNR of feedback path. For processing gain 22.5 dB, our experiments...
In this paper, an approach for estimating the number of emitters from a set of interleaved pulses trains is proposed. The approach is based on the application of information theoretic criterion, which is formulated by using a new model of eigenvalues from principal component analysis (PCA) of pulse envelope vectors. In this model, the logarithm likelihood function is obtained by clustering the eigenvalues...
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