CN102104564B - Channelized processing method for general ultra wideband reception - Google Patents
Channelized processing method for general ultra wideband reception Download PDFInfo
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- CN102104564B CN102104564B CN201110053266.9A CN201110053266A CN102104564B CN 102104564 B CN102104564 B CN 102104564B CN 201110053266 A CN201110053266 A CN 201110053266A CN 102104564 B CN102104564 B CN 102104564B
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Abstract
The invention relates to the technical field of a channelized processing method, in particular to a channelized processing method for a general ultra wideband. The method comprises the following steps of: extracting; filtering by a multi-phase filter; and outputting after Fourier transformation. According to the technical scheme provided by the invention, signals no matter when and where appear can be intercepted, demodulated, analyzed and processed, so that the channelized processing method for wideband reception has the capability of simultaneously processing information of a plurality of frequency points.
Description
Technical field
The present invention relates to a kind of channelizing processing method, relate in particular to a kind of channelized processing method for general ultra wideband reception.
Background technology
Receiver based on software radio requires to have broadband coverage, sensitivity preferably, the performances such as the ability of real time signal processing conventionally.Its design philosophy is that A/D converter is simulated to link near antenna, the minimizing of trying one's best as far as possible, and radio function as much as possible is realized with software.Optimal no more than directly carrying out A/D conversion at radio-frequency front-end, the work such as channel separation thereafter, demodulation are all completed with software.
Receiver structure based on software radio can be divided into three kinds at present: radio frequency low pass sampling digitizing structure, radio frequency bandpass sampling Digitized Structure and Wideband Intermediate Frequency band lead to Digitized Structure.
Radio frequency low pass sample mode carries out the signal of coming in from antenna just to carry out sampling digitizing wideband low pass filter and amplification.This mode is close to desirable software radio, but it not only has very high requirement to the performance of A/D converter as switching rate, bandwidth of operation, dynamic range etc., simultaneously also high especially to the processing speed requirement of follow-up DSP or ASIC, because radio frequency low pass is sampled, required sampling rate is at least the twice of radio frequency operation bandwidth highest frequency.With current device level, realizability is not high.
The main difference point of radio frequency bandpass sampling software radio architecture and low pass sampling software radio architecture is, adopted the electrically tunable filter of bandwidth relative narrower before A/D, then according to required processing bandwidth, carries out bandpass sampling.Just not high to the requirement of sampling rate like this, to the processing speed of follow-up DSP, also can greatly reduce thereupon.But it is pointed out that this radio frequency bandpass sampling software radio architecture to the requirement of A/D bandwidth of operation (being in fact mainly the rate request to sampling holder in A/D) still or higher.
The structure of Wideband Intermediate Frequency bandpass sampling software radio architecture and current Intermediate Frequency Digital Receiver is similarly, has all adopted repeatedly mixing system or has been superhet system.The main feature of this Wideband Intermediate Frequency bandpass sampling software radio architecture is that intermediate-frequency bandwidth is wider, and the functions such as all modulation /demodulation are all realized by software.Obviously, this Wideband Intermediate Frequency bandpass sampling software radio architecture is the most easily to realize in above-mentioned three kinds of structures, minimum to the performance requirement of device, but it from the requirement of desirable software radio farthest, and extensibility, flexibility are also the poorest.
According to current soft wireless receiver classification, it is the use that the sampling of radio frequency low pass or bandpass sampling have all reduced analogue device, use along with current high sampling rate A/D, the mode of two parallel samplings just can realize up to sampling rate more than 5G, but the another one problem of bringing along with the raising of sampling rate is the contradiction how solving between high-speed a/d chip and low speed signal processor.Streaming rate after ultrabroad band sampling is very high, by causing follow-up conversion speed, cannot catch up with, particularly to some synchronous demodulation algorithms, its amount of calculation is large, if its data throughput is too high, be to be difficult to requirement of real time, the contradiction how solving between high-speed a/d chip and low speed signal processor is the common problem existing in prior art.
Summary of the invention
For the contradiction between the high speed A existing in prior art/D chip and low speed signal processor, therefore need to provide a kind of channelized processing method for general ultra wideband reception, solve the contradiction between high speed A/D chip and low speed signal processor.
The invention discloses a kind of channelized processing method for general ultra wideband reception, it comprises following steps:
A. extract: broadband signal is evenly divided into D sub-frequency bands, carries out D doubly extract at multiphase filter front end, the signal after extraction enters multiphase filter and carries out filtering;
B. multiphase filter carries out filtering, and described filter is the heterogeneous component of prototype low pass filter;
C. Fourier transform: exported after by Fourier transform by the filtered signal of step b.
Preferably, above-mentioned steps B further comprises following steps:
A. according to prototype low-pass filter frequency, needed filter type and exponent number N are determined in response;
B. obtain the impulse response of prototype low pass filter
,
;
C. determine multiphase filter coefficient:
;
D. according to the definite poly phase filter coefficient of step c, carry out filtering.
Preferably, the filtered signal of above-mentioned steps B carries out twice extraction reduction of speed.
Preferably, if filter order N is not the integral multiple of D in above-mentioned steps a, after the integral multiple that the exponent number N that sets filter is D, calculate each rank coefficient.
Preferably, above-mentionedly state the fast algorithm that in step C, Fourier transform is discrete fourier transform.
Beneficial effect of the present invention is: signal no matter when and where appears in technical scheme provided by the invention, all can be intercepted and captured and carry out demodulation analysis processing, this broadband reception channelizing is processed and possessed the ability of simultaneously processing a plurality of frequency point information; Because the signal after low pass filter is complex signal, and extracted before low-pass filtering, therefore can extract again reduction of speed to this signal, multiband parallel processing output, low-speed processing technology is applied in permission in each passage, has solved the bottleneck problem between the vulgar signal processor of high-speed a/d chip and rear end under broadband signal reception condition; Signal is through digitlization and be transformed into lower frequency, makes information be convenient to store, and has solved the unbalanced problem of channel.
Accompanying drawing explanation
Fig. 1 is that general ultra wideband receive channelization of the present invention is processed block diagram.
Embodiment
Below in conjunction with Figure of description, describe the specific embodiment of the present invention in detail.
The invention discloses a kind of universal broadband channelizing processing method, it comprises the following steps:
A. extract: broadband signal is evenly divided into D sub-frequency bands, carries out D doubly extract at multiphase filter front end, the signal after extraction enters multiphase filter and carries out filtering; Handling principle based on channelizing, the multiphase filter of each channel is the heterogeneous component of prototype low pass filter, the product term of first multiplier is taken as
, wherein:
,
(at the bottom of natural logrithm); π=3.1415926 (circumference ratio), j (imaginary number) meets relation: j
2=-1.
B. filtering is carried out in multiphase filter filtering, and described filter is the heterogeneous component of prototype low pass filter;
C. Fourier transform: exported after by Fourier transform by the filtered signal of step B.
At multiphase filter front end, carry out D and doubly extract, signal is no matter when and where occurred, all can be intercepted and captured and carry out demodulation analysis processing, this broadband reception channelizing is processed and possessed the ability of simultaneously processing a plurality of frequency point information;
Preferably, above-mentioned steps B further comprises following steps:
A. according to prototype low-pass filter frequency, needed filter type and exponent number N are determined in response, for example: N can obtain according to the REMEZORD function in Matlab herein;
B. obtain the impulse response of prototype low pass filter
,
;
C. determine multiphase filter coefficient:
;
D. according to the definite poly phase filter coefficient of step c, carry out filtering.
Preferably, through the filtered signal of above-mentioned steps B, carry out twice and extract reduction of speed; Because the signal after low pass filter is complex signal, bandwidth is
, and carried out before low-pass filtering
doubly extract, therefore can carry out again twice to this signal, extract reduction of speed, after reduction of speed, further solved the bottleneck problem between high-speed a/d chip and rear end low speed signal processor under broadband signal reception condition.
Preferably, if filter order N is not the integral multiple of D in above-mentioned steps a, can be as direct computing, each point calculates, and after extraction in can give up the point of the integral multiple that is not D, cause the waste of a lot of operational capabilities, so when the exponent number N of filter is not the integral multiple of D, recalculate each rank coefficient.
Preferably, the fast algorithm that in above-mentioned steps C, Fourier transform is discrete fourier transform, it is the characteristics such as strange, idol according to discrete fourier transform, void, reality, and the algorithm of discrete Fourier transform (DFT) is improved to acquisition.It does not have new discovery to the theory of Fourier transform, but for applying discrete Fourier transform (DFT) in digital system in other words in computer system, can be described as into major step.Arithmetic speed is accelerated greatly, thereby has improved greatly the processing capability in real time that this universal broadband channelizing is processed.
Below in conjunction with Figure of description, the specific embodiment of the present invention is described in further detail, general ultra wideband receive channelization of the present invention is as shown in Figure 1 processed block diagram.In this embodiment, the input signal bandwidth designing a model is 0Hz～2.56GHz, and sampling rate is 5.12GHz, and 2.56GHz is evenly divided into D=32 channel by channel width 80MHz, by name 0,1 ..., No. 31 channels.Design cycle is as follows:
32 sub-channels, the centre frequency of each subchannel must satisfied constraints be:
,
.To the extraction operation of signal, be by signal
be divided into
(
=32) road, is about to input signal and is divided into
road, the 0th tunnel is the r * 32+32 point (the 32nd, 64,96 ... point), the 1st tunnel is r * 32+31 point the (the 31st, 63,95 ... point), the 2nd tunnel is r * 32+30 point (the 30th, 62,94 ... point), the like, 31 road is the r * 32+1 point (the 1st, 33,65 ... point), wherein:
.
A) prototype filter
multiphase filter coefficient parameter designing adopt MATLAB instrument FDATOOL, window function is selected Hamming, passband is 40MHz, the number of channel is 32; Utilize the REMEZORD function in Matlab can conveniently obtain the best required prototype filter exponent number N of maxmin criterion algorithm that approaches of employing.
B) filter in accompanying drawing 1
be prototype low pass filter
heterogeneous component
, wherein
represent
road signal, the filter passing through as the 0th road signal is h(m * 32+1), the filter that the 1st road signal passes through is h(m * 32+2) ... the filter that the 3rd road signal passes through is h(m * 32+4),
.
C) if filter order N is not the integral multiple of D, need carry out reverse design, after the integral multiple that the exponent number N that sets filter is D, recalculate each rank coefficient.
D) 32 road signals are exported 32 points at every turn, are DFT by these 32, and in order to raise the efficiency, DFT realizes with FFT, respectively as each road
,
...
,
.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a universal broadband channelizing processing method, it comprises the following steps:
A. extract: broadband signal is evenly divided into D sub-frequency bands, carries out D doubly extract at multiphase filter front end, the signal after extraction enters multiphase filter and carries out filtering;
B. multiphase filter carries out filtering: described filter is the heterogeneous component of prototype low pass filter;
C. Fourier transform: exported after by Fourier transform by the filtered signal of step B;
Described step B comprises following steps:
A. according to prototype low-pass filter frequency, needed filter type and exponent number N are determined in response;
B. obtain the impulse response of prototype low pass filter
,
;
C. determine multiphase filter coefficient:
;
D. according to the definite multiphase filter coefficient of step c, carry out filtering;
If filter order N is not the integral multiple of D in described step a, after the integral multiple that the exponent number N that sets filter is D, calculate each rank coefficient;
Method to the described extraction of signal is specially: by signal
be divided into
road, when D=32, the 0th tunnel is the r * 32+32 point, and the 1st tunnel is r * 32+31 point, and the 2nd tunnel is r * 32+30 point, the like, 31 road is the r * 32+1 point, wherein:
.
2. universal broadband channelizing processing method as claimed in claim 1, is characterized in that the filtered signal of described step B carries out twice and extracts reduction of speed.
3. universal broadband channelizing processing method as claimed in claim 2, is characterized in that the fast algorithm that in described step C, Fourier transform is discrete fourier transform.
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| FR3006535A1 (en) * | 2013-05-28 | 2014-12-05 | France Telecom | METHOD AND DEVICE FOR MODULATING DELIVERING MULTIPLE CARRIER SIGNAL, DEMODULATION METHOD AND DEVICE AND CORRESPONDING COMPUTER PROGRAM. |
| CN108832945A (en) * | 2018-06-19 | 2018-11-16 | 哈尔滨工程大学 | A kind of implementation method of the efficient MWC compression sampling digital receiver structure based on heterogeneous structure |
| CN112994713A (en) * | 2021-02-05 | 2021-06-18 | 中国人民解放军海军航空大学航空作战勤务学院 | Channelized receiving method based on multiphase filter bank |
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| CN101667818A (en) * | 2009-09-03 | 2010-03-10 | 中国人民解放军信息工程大学 | Method and device for channelizing real signal |
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|---|---|---|---|---|
| CN101398480A (en) * | 2008-11-06 | 2009-04-01 | 哈尔滨工程大学 | Flexible sub-band reconstructed broad-band channel device |
| CN101667818A (en) * | 2009-09-03 | 2010-03-10 | 中国人民解放军信息工程大学 | Method and device for channelizing real signal |
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