Signal processing and sampling method based on periodic signal mixing
A periodic signal and signal processing technology, applied in the field of signal processing, can solve problems such as difficult control, limited fixed filter characteristics, and insufficient adjustable range, and achieve the effects of simplified structure, easy implementation, and shortened reconstruction time
Active Publication Date: 2018-01-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
[0004] In the signal sampling system, the use of non-reconfigurable analog filters for analog signal processing is often limited by the fixed filtering characteristics limited by its physical structure, which cannot meet different filtering requirements
However, among the tunable filters at this stage, the response time of the mechanically tuned filter is long, and it is not easy to control.
The proposal of electronically tunable reconfigurable filters (Hunter I C, Rhodes J D. Electronically tunable microwave bandpass filters. IEEETransactions on Microwave Theory and Techniques, 1982.) Although the response time is relatively improved, it is still limited by factors such as temperature
So far, there are few reports on filters that can realize frequency and bandwidth tuning at the same time, and the adjustable range is usually not large enough
Method used
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[0026] The system block diagram of this embodiment is as figure 2 As shown, it includes: a periodic signal generator 1, a mixer 2, a low-pass filter (LPF) 3, an adjustable delay 4, and an analog-to-digital converter (ADC) 5.
[0027] The present invention is based on the signal processing and sampling method of periodic signal mixing, comprising the following steps
[0028] 1) The periodic signal generator 1 generates a period of T s The periodic signal p(t): Such as image 3 (a) shown. Among them, period T s That is the required signal sampling period, p s (t) is a single pulse forming the periodic signal p(t), the pulse spectrum P s (Ω) as image 3 As shown in (b), and there is C m =P s (mΩ s ), Ω s =2π / T s .
[0029] 2) Send the generated periodic signal p(t) and the signal x(t) to be processed into the mixer 2 whose bandwidth is greater than the signal processing frequency band range for mixing;
[0030] 3) the signal output by the mixer is sent into the in...
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The invention provides a signal processing and sampling method based on periodic signal mixing. According to the method, different signal processing functions is achieved by reconstruction by adjusting the time domain outline of a periodic signal. By adoption of the method, simulation processing and sampling of the signal can be accomplished at the same time, the equivalent frequency response of the signal processing can be flexibly configured by adjusting the time domain outline of the periodic signal, so that the response time and the system complexity of signal processing reconstruction aregreatly reduced, and meanwhile the system bandwidth limitations brought by the signal processing by using a traditional filter are broken through.
Description
technical field [0001] The invention relates to signal processing, in particular to a signal processing and sampling method based on periodic signal mixing to simultaneously realize reconfigurable signal processing and sampling. Background technique [0002] With the rapid development of digital technology, it is the development trend of information technology to obtain digital signals from analog signal sampling, and to store, process, transmit and display them. Before sampling and quantizing the analog signal, it is often necessary to process the signal according to the requirements of different applications. [0003] Analog signal processing includes frequency selection, phase shifting and anti-interference of signals, etc., which is a key technology in the field of electronics and communication. In modern telecommunication equipment and various control systems, filters are usually used to complete the work of analog signal processing. Filters are widely used and are one...
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Inventor 吴龟灵王思同孙一唯陈建平
Owner SHANGHAI JIAO TONG UNIV