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Research on Reconstruction and Application of Nonuniformly Sampled Signals

Author: LianJian
Tutor: LiuWang
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: Nonuniform sampling Parallel time-interleaved ADC Time phase mismatch error Signal Reconstruction Polynomial approximation
CLC: TP274.2
Type: Master's thesis
Year: 2011
Downloads: 144
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Abstract


With the development of high-speed data acquisition technology, non-uniform sampling become an important research content of digital signal processing field. The nonuniform sampling non-uniform sampling as a special form of its engineering model exists the temporal phase mismatch errors Parallel alternate the ADC (TIADC) structure. TIADC structure using multi-channel parallel ADC signal alternate sampling constitute the ultra-high-speed data acquisition system, but the time between the channel phase mismatch error system degradation cycle non-uniform sampling. The presence of a mismatch error will seriously reduce TIADC performance of the system must be calibrated mismatch error in actual applications. The mismatch error calibration cycle TIADC system time phase signal reconstruction problem is equivalent to non-uniform sampling. Based on the above background, the cycle of non-uniform sampling signal reconstruction problem, and it the TIADC system research. This paper studies the cycle of the principle of non-uniform sampling, analytical expression of the cycle of non-uniform sampling signal time domain model and digital spectrum analysis of the impact of the non-uniform sampling of the sampled signal spectrum. Based on this research cycle non-uniform sampling signal reconstruction problem. Non-uniform sampling in order to obtain cycle time deviation, two basic algorithms: sine fitting method and the interpolation FFT method, time offset estimation algorithm has been improved for two basic characteristics of the algorithm. For periodic non-uniform sampling signal reconstruction, reconstruction algorithm of polynomial approximation and spline interpolation reconstruction algorithm. The use of cycle periodic non-uniform sampling and to simplify polynomial approximation reconstruction algorithm and iterative calculations to improve the algorithm for the reconstruction of the high-frequency input signal effect. In order to verify the study algorithm developed 12bit 400MSPS 4 through parallel time alternately ADC system, the system is composed by four ADS6124. Improved estimation algorithm to measure the system channel mismatch errors, use the polynomial approximation reconstruction algorithm to reconstruct the system of sampling signal testing and analysis, and finally the reconstruction of the system before and after the main dynamic parameters. The test results show that after reconstruction, the system performance can be significantly improved signal-to-noise and distortion ratio (SINAD) can be increased by 14 to 18dBc, the effective number of bits (ENOB) can be increased by 2 ~ 3bit. The average reconstructed system signal-to-noise and distortion ratio of about 50dBc. The test results proved that the non-uniform time of this study cycle bias estimation algorithm and periodic non-uniform sampling of the validity of the signal reconstruction algorithm.

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