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Estimation and compensation method for delay and phase deviation of hybrid filter bank DAC

A hybrid filter bank and phase offset technology, applied in multi-carrier systems, modulated carrier systems, digital transmission systems, etc., can solve problems such as broadband signal distortion, signal transmission path delay, and phase offset

Active Publication Date: 2018-05-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the difference in the length of the signal transmission path will cause a delay, and the up-conversion operation will introduce a phase shift, and these errors will cause distortion of the final output broadband signal

Method used

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  • Estimation and compensation method for delay and phase deviation of hybrid filter bank DAC
  • Estimation and compensation method for delay and phase deviation of hybrid filter bank DAC
  • Estimation and compensation method for delay and phase deviation of hybrid filter bank DAC

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Embodiment

[0050] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0051] DAC (Digital-to-Analog Converter): digital-to-analog converter;

[0052] ADC (Analog-to-Digital Converter): Analog-to-Digital Converter;

[0053] FPGA (Field-Programmable Gate Array): field programmable gate array;

[0054] Figure 4 It is a structural block diagram of a dual-channel hybrid filter bank DAC that realizes estimation and compensation of delay and phase offset in the present invention.

[0055] In this example, if Figure 4 Shown, the two-channel hybrid filter bank DAC that the present invention realizes has delay and phase offset estimation and compensation mainly by DAC, low-pass filter, up-converter (local oscillator, frequency mixer and band-pass filter) ), adder, ADC, data processing module and pre-distortion module. The final output signal of the hybrid filter bank DAC is sampled by the ADC, and the data processi...

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Abstract

The invention discloses an estimation and compensation method for delay and phase deviation of a hybrid filter bank DAC. The method comprises the steps that a final output signal of the hybrid filterbank DAC system is sampled, and then an autopower spectrum of the final output signal of the hybrid filter bank DAC system is calculated according to a sampling result; according to other known signals, autopower spectra of the signals or cross-power spectra among the signals are calculated; values of delay and phase deviation are estimated according to a derived linear equation containing delay and phase deviation by adopting a three-point method, a linear module equation solver and an expansion Euclid equation; and the obtained estimated values are fed back to a predistortion module, and finally compensation of delay and phase deviation is completed by conducting predistortion on input signals of a second channel.

Description

technical field [0001] The invention belongs to the technical field of radio communication, and more specifically relates to a method for estimating and compensating a hybrid filter bank DAC delay and phase offset. Background technique [0002] The function of the digital-to-analog converter DAC in the software radio system is to convert the digital signal processed by the system into the analog signal required for radio frequency transmission. However, the bandwidth of the output signal of the existing DAC is limited by the bandwidth of the DAC itself, so that the DAC cannot output a high-bandwidth signal that meets the requirements of the software defined radio system. [0003] Hybrid filter bank DAC is an effective way to achieve high bandwidth, its principle is as follows figure 1 Shown: m channel digital signal x 1_m [n] through m DACs respectively 1_m Convert to m channel analog signal x 1_m (t), get m subgrade band signal x 1L_mL (t), x 1L_mL (t) Move the respec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38
CPCH04L27/266H04L27/2695H04L27/3854
Inventor 刘科杨兴王厚军田书林肖寅东郭广坤黄建国黄磊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA