CN105490689A - High linearity radio frequency receiving processing method - Google Patents
High linearity radio frequency receiving processing method Download PDFInfo
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- CN105490689A CN105490689A CN201410487330.8A CN201410487330A CN105490689A CN 105490689 A CN105490689 A CN 105490689A CN 201410487330 A CN201410487330 A CN 201410487330A CN 105490689 A CN105490689 A CN 105490689A
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Abstract
The invention discloses a high linearity radio frequency receiving processing method. The method comprises the following steps of firstly, compressing a received radio frequency input signal so as to lower the linearity requirement and power consumption of a post-stage circuit; performing frequency conversion on the compressed radio frequency signal through a frequency mixer so as to obtain an intermediate frequency signal; performing filtering processing on the intermediate frequency signal; converting the filtered intermediate frequency signal into a digital intermediate frequency signal through an analog-digital conversion circuit; restoring the digital intermediate frequency signal through a digital restoration circuit so as to eliminate signal distortion caused by compression of the radio frequency signal; and outputting the digital intermediate frequency signal. Through adoption of the method, the defects in the prior art are overcome, the linearity pressure of a module circuit in a high linearity receiver can be alleviated, and the implementation difficulty and circuit power consumption are lowered while a high linearity design is implemented.
Description
Technical field
The present invention relates to a kind of radio frequency reception processing method, particularly relate to the method for a kind of High Linear radio frequency reception process.
Background technology
Receiver receives and nurses one's health the electronic unit of radio frequency (RF) input signal, can perform various types of signal condition, such as low noise amplification, filtering, down-conversion etc.The design of receiver is considered due to various design such as such as performance, power consumption etc. and has challenge, for many application, need high-performance to meet system specifications and to reach good overall performance, the performance of receiver can be characterized by the such as various parameter such as the linearity, dynamic range and noiseproof feature: the linearity refers to amplifying signal and do not produce the ability of a large amount of distortion, dynamic range refers to the scope receiving signal level of receiver expection process, noiseproof feature refers to the noisiness that receiver generates, for some application, low-power consumption is also highly close to need.Such as, receiver can be used in the portable sets such as such as cell phone, and low-power consumption can extend the battery life between twice charging, and this highly closes to need, and therefore, this area needs the receiver that can provide superperformance under low-power consumption.
High Linear high performance universal receiver can be widely used in military communication and commercial communication, has far-reaching social effect and huge research and development value.Along with the fast development of Modern modulation system, and the utilance of wireless frequency spectrum is increasingly sharpened, to receive and the linearity and the aspect performance such as power consumption and index propose more and more harsher requirement.This improves the linearity of receiver under just requiring the prerequisite of modern generic reception airborne guarantee input ability as much as possible, is that distorted signals is minimum, the error rate is minimum.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of linearity pressure that can reduce modular circuit in High Linear receiver is provided, reduce while realizing High Linear design and realize difficulty, reduce the method for a kind of High Linear radio frequency reception process of circuit power consumption.
The object of the invention is to be achieved through the following technical solutions:
A method for High Linear radio frequency reception process, it comprises the following steps:
S1: first compression process is carried out, to reduce linearity and the power consumption of late-class circuit to radio-frequency input signals x (t) received;
S2: the radiofrequency signal after compression is carried out frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal;
S3: filtering process is carried out to intermediate-freuqncy signal;
S4: filtered intermediate frequency signal is converted to digital medium-frequency signal y (n) by analog to digital conversion circuit;
S5: recovered by digital restore circuit digital medium-frequency signal, eliminates the distorted signals caused when radiofrequency signal is compressed;
S6: export digital medium-frequency signal.
Signal is after Recovery processing, and also comprising one will carry out the step of interpolation processing to the resolution of signal, realize realizing high-resolution output with the ADC of low resolution.
The invention has the beneficial effects as follows: the present invention by compressing input signal, analog-to-digital conversion, afterwards again to signal carry out numeral recover processing mode, reduce the linearity to circuit, also reduce circuit power consumption and realize difficulty.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention;
Fig. 2 is that the present invention carries out the ADC structure chart of interpolation to the resolution of signal.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
As shown in Figure 1, the method for a kind of High Linear radio frequency reception process, it comprises the following steps:
S1: first compression process is carried out, to reduce linearity and the power consumption of late-class circuit to radio-frequency input signals x (t) received;
S2: the radiofrequency signal after compression is carried out frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal;
S3: filtering process is carried out to intermediate-freuqncy signal;
S4: filtered intermediate frequency signal is converted to digital medium-frequency signal y (n) by analog to digital conversion circuit;
S5: recovered by digital restore circuit digital medium-frequency signal, eliminates the distorted signals caused when radiofrequency signal is compressed;
S6: export digital medium-frequency signal.
Consider frequency response and gain relevant to input, be h (t through frequency mixer and filter, ADC to the transfer function that numeral inputs from compression amplifier, x) (wherein h (t, x) can be the continuous function relevant to x (t), also can be the piecewise function relevant to x (t), if piecewise function then needs to obtain corresponding transfer function by the mode of look-up table).
Numeral input is expressed as
The expression formula of discretization
Hypothesis is when i <-m, i > m time again, h (i, x) → 0, so
In step S5 to the expression formula that compression function recovers be:
Signal is after Recovery processing, and also comprising one will carry out the step of interpolation processing to the resolution of signal, realize realizing high-resolution output with the ADC of low resolution:
As shown in Figure 2, the resolution of signal is carried out to the ADC of structure in the operation employing figure of interpolation, the sample rate of ADC is FS, reference voltage VREF, and resolution is N position, so the quantization noise power of this ADC
noise power spectral density can be obtained when supposing that quantizing noise is white noise
again by design corresponding H (z) can effective inhibitory amount noise.Suppose that signal bandwidth is f
bWwhen can obtain quantization noise power in signal effective bandwidth
Suppose f ∈ [0f again
bW] when,
(design ensures A > > 1 usually); So
just higher resolution can be obtained according to the interference signal that description above can be removed outside effective bandwidth by the mode of signal transacting when signal recuperation.
Claims (2)
1. a method for High Linear radio frequency reception process, is characterized in that: it comprises the following steps:
S1: first compression process is carried out, to reduce linearity and the power consumption of late-class circuit to the radio-frequency input signals received;
S2: the radiofrequency signal after compression is carried out frequency-conversion processing by frequency mixer, obtains intermediate-freuqncy signal;
S3: filtering process is carried out to intermediate-freuqncy signal;
S4: filtered intermediate frequency signal is converted to digital medium-frequency signal by analog to digital conversion circuit;
S5: recovered by digital restore circuit digital medium-frequency signal, eliminates the distorted signals caused when radiofrequency signal is compressed;
S5: export digital medium-frequency signal.
2. the method for a kind of High Linear radio frequency reception according to claim 1 process, it is characterized in that: signal is after Recovery processing, also comprise one and the resolution of signal will be carried out to the step of interpolation processing, realize realizing high-resolution output with the ADC of low resolution.
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| CN201410487330.8A CN105490689B (en) | 2014-09-19 | 2014-09-19 | A kind of method of High Linear radio frequency reception processing |
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| CN201410487330.8A CN105490689B (en) | 2014-09-19 | 2014-09-19 | A kind of method of High Linear radio frequency reception processing |
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| CN105490689A true CN105490689A (en) | 2016-04-13 |
| CN105490689B CN105490689B (en) | 2018-11-23 |
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Citations (7)
| 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 |
| JPH07212416A (en) * | 1994-01-21 | 1995-08-11 | Advantest Corp | Burst wave rising and falling characteristic evaluation device |
| JP2000236276A (en) * | 1999-02-15 | 2000-08-29 | Toyo Commun Equip Co Ltd | Broadband digital receiver |
| 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 |
-
2014
- 2014-09-19 CN CN201410487330.8A patent/CN105490689B/en active Active
Patent Citations (7)
| 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 |
| JPH07212416A (en) * | 1994-01-21 | 1995-08-11 | Advantest Corp | Burst wave rising and falling characteristic evaluation device |
| JP2000236276A (en) * | 1999-02-15 | 2000-08-29 | Toyo Commun Equip Co Ltd | Broadband digital receiver |
| 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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