Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and Experimental Verification of a Novel
  Error-Backpropagation-Based Background Calibration for Time Interleaved ADC
  in Digital Communication Receivers   A novel background calibration technique for Time-Interleaved
Analog-to-Digital Converters (TI-ADCs) is presented in this paper. This
technique is applicable to equalized digital communication receivers. As shown
by Tsai et al. [1] and Luna et al. [2], in a digital receiver it is possible to
treat the TI-ADC errors as part of the communication channel and take advantage
of the adaptive equalizer to compensate them. Therefore calibration becomes an
integral part of the channel equalization. No special purpose analog or digital
calibration blocks or algorithms are required. However, there is a large class
of receivers where the equalization technique cannot be directly applied
because other signal processing blocks are located between the TI-ADC and the
equalizer. The technique presented here generalizes earlier works to this class
of receivers. The error backpropagation algorithm, traditionally used in
machine learning, is applied to the error computed at the receiver slicer and
used to adapt an auxiliary equalizer adjacent to the TI-ADC, called the
Compensation Equalizer (CE). Simulations using a dual polarization optical
coherent receiver model demonstrate accurate and robust mismatch compensation
across different application scenarios. Several Quadrature Amplitude Modulation
(QAM) schemes are tested in simulations and experimentally. Measurements on an
emulation platform which includes an 8 bit, 4 GS/s TI-ADC prototype chip
fabricated in 130nm CMOS technology, show an almost ideal mitigation of the
impact of the mismatches on the receiver performance when 64-QAM and 256-QAM
schemes are tested. An absolute improvement in the TI-ADC performance of
$\sim$15 dB in both SNDR and SFDR is measured.

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The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
8
The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph