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A Three-way Signal Aliasing Processing Method Applied to Bandpass Sampling

A processing method and band-pass sampling technology, applied in transmission systems, electrical components, etc., can solve problems such as increasing the difficulty of implementation, and achieve the effect of improving versatility and flexibility

Active Publication Date: 2021-02-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Many scholars are also committed to finding new algorithms to simplify the frequency selection process. However, these methods will inevitably limit the selection of sampling frequency in order to avoid aliasing. At the same time, the cumbersome calculation process also increases the difficulty of implementation, and the lower the sampling frequency The precision has higher requirements on the pre-analog RF bandpass filter, so blindly pursuing a low sampling frequency is not the best method

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  • A Three-way Signal Aliasing Processing Method Applied to Bandpass Sampling
  • A Three-way Signal Aliasing Processing Method Applied to Bandpass Sampling
  • A Three-way Signal Aliasing Processing Method Applied to Bandpass Sampling

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Embodiment Construction

[0039] Assume that the RF bandpass signal to be sampled is R(f), and its bandwidth is B. Using the sampling frequency f s for f s = 2B. All signals in the following frequency regions are defined as signals with index n, where we define n as the position index:

[0040] (n-1 / 2) f s s

[0041] After band-pass sampling, all signals with index n will be mapped to the frequency range -B<f<B. According to the principle of band-pass sampling, the band-pass signal at any position can be recovered within 0<f<B. However, for multi-bandpass signals at different index positions, overlapping may occur within 0<f<B after bandpass sampling. When processing multi-band signals in the prior art, the main consideration is to select a sampling frequency as low as possible to reduce the burden of back-end digital processing on the premise that spectrum aliasing does not occur. Many scholars are also committed to finding new algorithms to simplify the frequency selection process. However, th...

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Abstract

The invention provides a three-way signal aliasing processing method applied to band-pass sampling, which is used for sampling and separating processing of multi-band radio frequency band-pass signals, and performing third-order band-pass processing on the multi-frequency band radio frequency band-pass signals to be processed through sampling streams. Through sampling, set the sampling frequency so that the three signals are allowed to alias in the same frequency domain after sampling; introduce a delay difference between the sampling streams to form a sampled signal with a phase difference, and design an anti-aliasing filter according to the phase difference. Thereby effectively eliminating the aliasing phenomenon caused by the other two signals. By adopting this method, the alias-free reception of any bit signal can be realized by using a fixed sampling frequency, and the sampling frequency does not need to be frequently changed for different position signals during the receiving process, which simplifies the analog front end.

Description

technical field [0001] The invention relates to the field of software radio signal reception, in particular to a three-way signal aliasing processing method applied to band-pass sampling. Background technique [0002] As a wireless communication implementation method and means, software radio has been widely used in wireless communication, especially 4G communication. The core idea of ​​software radio is to realize as many functions as possible by application software and simplify the analog part as much as possible. Therefore, the software radio requires high sampling rate and precision for the processing of radio frequency signals. The application of bandpass sampling theorem can greatly reduce the The required RF sampling rate lays the foundation for the subsequent real-time processing. The theory of band-pass sampling was first proposed by R.G.Vaughan in 1991. In recent years, due to the development of AD sampling technology, the sampling rate and accuracy have been con...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04B1/00
CPCH04B1/005H04B1/1638
Inventor 王洪梅王法广李世银樊佳恒姚冲
Owner CHINA UNIV OF MINING & TECH
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