CN105490689B - A kind of method of High Linear radio frequency reception processing - Google Patents
A kind of method of High Linear radio frequency reception processing Download PDFInfo
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- CN105490689B CN105490689B CN201410487330.8A CN201410487330A CN105490689B CN 105490689 B CN105490689 B CN 105490689B CN 201410487330 A CN201410487330 A CN 201410487330A CN 105490689 B CN105490689 B CN 105490689B
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Abstract
The invention discloses a kind of methods of High Linear radio frequency reception processing, it includes the following steps：Compression processing is carried out to received radio-frequency input signals first, to reduce the linearity and power consumption of late-class circuit；Compressed radiofrequency signal is subjected to frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal；Intermediate-freuqncy signal is filtered；Filtered intermediate frequency signal is converted into digital medium-frequency signal by analog to digital conversion circuit；Digital medium-frequency signal is restored by digital restoring circuit, eliminates caused distorted signals when radiofrequency signal is compressed；Export digital medium-frequency signal.The present invention overcomes the deficiencies in the prior art, can reduce the linearity pressure of modular circuit in High Linear receiver, reduce while realizing High Linear design and realize difficulty, reduce circuit power consumption.
Description
Technical field
The present invention relates to a kind of methods that radio frequency reception processing method more particularly to a kind of High Linear radio frequency reception are handled.
Background technique
Receiver is the electronic unit for receiving and improving radio frequency (RF) input signal, and various types of signal tune can be performed
Reason, low noise amplification, filtering, down coversion etc..The design of receiver since the various designs such as performance, power consumption consider and
It is extremely challenging, for many applications, high-performance is needed to meet system specifications and reach good overall performance, is received
The performance of machine can be characterized by various parameters such as the linearity, dynamic range and noiseproof features：The linearity refers to amplified signal
Without generating the ability largely to distort, dynamic range refers to the range for receiving signal level of the expected processing of receiver, noise-induced
It can refer to the noisiness that receiver generates, for certain applications, low-power consumption is also that height conjunction needs.For example, receiver can be used in
In the portable devices such as cellular phone, and low-power consumption can extend the battery life between charging twice, this is that height is closed
It needs, therefore, this field needs that the receiver of superperformance can be provided under low-power consumption.
High Linear high performance universal receiver can be widely applied in military communication and commercial communication, have far-reaching society
Meaning and huge research and development value.Utilization rate with the fast development of Modern modulation system, and wireless frequency spectrum is increasingly sharpened, right
Receive and the linearity and power consumption etc. performance and index propose the requirement of increasingly harshness.It is connect this requires the modern times are general
Under the premise of receiving airborne guarantee signal detection ability, the linearity of receiver is improved as far as possible, is distorted signals minimum, error code
Rate is minimum.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind can reduce module in High Linear receiver
The linearity pressure of circuit reduces while realizing High Linear design and realizes difficulty, reduces a kind of High Linear of circuit power consumption
The method of radio frequency reception processing.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method of High Linear radio frequency reception processing, it includes the following steps：
S1：Compression processing is carried out to received radio-frequency input signals x (t) first, is wanted with reducing the linearity of late-class circuit
Summation power consumption；
S2：Compressed radiofrequency signal is subjected to frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal；
S3：Intermediate-freuqncy signal is filtered；
S4：Filtered intermediate frequency signal is converted into digital medium-frequency signal y (n) by analog to digital conversion circuit；
S5：Digital medium-frequency signal is restored by digital restoring circuit, is eliminated caused when radiofrequency signal is compressed
Distorted signals；
S6：Export digital medium-frequency signal.
After the recovered processing of signal, further include the steps that one will to the resolution ratio of signal carry out interpolation processing, realize with
The ADC of low resolution realizes high-resolution output.
The beneficial effects of the invention are as follows：The present invention by being compressed to input signal, analog-to-digital conversion, later again to signal
The processing mode for carrying out digital recovery, reduces the linearity to circuit, also reduces the power consumption of circuit and realizes difficulty.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention；
Fig. 2 is the ADC structure chart that the present invention carries out interpolation to the resolution ratio of signal.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1, a kind of method of High Linear radio frequency reception processing, it includes the following steps：
S1：Compression processing is carried out to received radio-frequency input signals x (t) first, is wanted with reducing the linearity of late-class circuit
Summation power consumption；
S2：Compressed radiofrequency signal is subjected to frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal；
S3：Intermediate-freuqncy signal is filtered；
S4：Filtered intermediate frequency signal is converted into digital medium-frequency signal y (n) by analog to digital conversion circuit；
S5：Digital medium-frequency signal is restored by digital restoring circuit, is eliminated caused when radiofrequency signal is compressed
Distorted signals；
S6：Export digital medium-frequency signal.
Consider that frequency response and gain are related to input, from compression amplifier pass through frequency mixer and filter, ADC to
The transfer function of numeral input is that h (t, x) (wherein h (t, x) can be continuous function relevant to x (t), be also possible to and x
(t) relevant piecewise function then needs the mode by searching for table to obtain corresponding transfer function if it is piecewise function).
Numeral input is expressed asThe expression formula of discretizationIt assumes again that when i <-m, i > m, h (i, x) → 0, then
The expression formula restored in step S5 to compression function is：
After the recovered processing of signal, further include the steps that one will to the resolution ratio of signal carry out interpolation processing, realize with
The ADC of low resolution realizes high-resolution output：
As shown in Fig. 2, the operation for carrying out interpolation to the resolution ratio of signal uses the ADC of structure in figure, the sample rate of ADC is
FS, reference voltage VREF, resolution ratio are N, then the quantization noise power of the ADC assumes that quantizing noise is white
Can obtain that noise power spectral density passes through the corresponding H (z) of design again in the case where noise can be with effective inhibitory amount
Change noise.Assuming that signal bandwidth is fBWIn the case where can obtain quantization noise power in signal effective bandwidthAssume again that f ∈ [0 fBW] in the case where,(it is commonly designed guarantee
A > > 1)；It so as described above can be logical when signal restores
Higher resolution ratio can be obtained by crossing the interference signal that the mode of signal processing is removed outside effective bandwidth.
Claims (1)
1. a kind of method of High Linear radio frequency reception processing, it is characterised in that：It includes the following steps：
S1：Compression processing is carried out by compression amplifier to received radio-frequency input signals first, to reduce the line of late-class circuit
Property degree require and power consumption；
S2：Compressed radiofrequency signal is subjected to frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal；
S3：Intermediate-freuqncy signal is filtered by filter；
S4：Filtered intermediate frequency signal is converted into digital medium-frequency signal by analog to digital conversion circuit ADC；
S5：Digital medium-frequency signal is restored by digital restoring circuit, eliminates caused signal when radiofrequency signal is compressed
Distortion；
S6：Export digital medium-frequency signal；
Consider that frequency response and gain are related to input, passes through frequency mixer and filter, ADC to number from compression amplifier
The transfer function of input is h (t, x)；
Numeral input is expressed asThe expression formula of discretizationIt assumes again that and works as i
When <-m, i > m, h (i, x) → 0, then
The expression formula restored in step S5 to compression function is：
ADC is used to the operation that the resolution ratio of signal carries out interpolation, the sample rate of ADC is FS, reference voltage VREF, resolution ratio N
Position, then the quantization noise power of the ADCAssuming that quantizing noise is that can to obtain noise power spectrum close in the case where white noise
DegreeIt again can be with effective inhibitory amount noise by design corresponding H (z), it is assumed that signal bandwidth fBWIn the case where
The quantization noise power in signal effective bandwidth can be obtainedAssume again that f ∈ [0fBW] in the case where,SoWherein A>>1.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2054173A1 (en) * | 1990-10-25 | 1992-04-26 | Masaki Ichihara | Digital radio receiver having amplitude limiter and logarithmic detector |
| CN101324646A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Amplitude probability distribution statistical parameter measuring instrument |
| CN201315576Y (en) * | 2008-12-29 | 2009-09-23 | 西安永瑞自动化有限公司 | Electric signal compression system |
| CN101656562A (en) * | 2009-09-22 | 2010-02-24 | 武汉虹信通信技术有限责任公司 | Device and method for realizing elimination of self-excitation interference of repeater |
| CN101741317A (en) * | 2009-11-26 | 2010-06-16 | 北京北方烽火科技有限公司 | Digital predistortion linear broadband radio-frequency power amplifier device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3369700B2 (en) * | 1994-01-21 | 2003-01-20 | 株式会社アドバンテスト | Burst wave rise / fall characteristics evaluation device |
| JP3955965B2 (en) * | 1999-02-15 | 2007-08-08 | 株式会社ケンウッド | Wideband digital receiver |
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2014
- 2014-09-19 CN CN201410487330.8A patent/CN105490689B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2054173A1 (en) * | 1990-10-25 | 1992-04-26 | Masaki Ichihara | Digital radio receiver having amplitude limiter and logarithmic detector |
| CN101324646A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Amplitude probability distribution statistical parameter measuring instrument |
| CN201315576Y (en) * | 2008-12-29 | 2009-09-23 | 西安永瑞自动化有限公司 | Electric signal compression system |
| CN101656562A (en) * | 2009-09-22 | 2010-02-24 | 武汉虹信通信技术有限责任公司 | Device and method for realizing elimination of self-excitation interference of repeater |
| CN101741317A (en) * | 2009-11-26 | 2010-06-16 | 北京北方烽火科技有限公司 | Digital predistortion linear broadband radio-frequency power amplifier device |
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| CN105490689A (en) | 2016-04-13 |
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