CN101316102A - Wave filter for digital baseband receiver and design method thereof - Google Patents
Wave filter for digital baseband receiver and design method thereof Download PDFInfo
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Abstract
The invention provides a filter used for a digital baseband receiving machine. The filter is used for carrying out analogue to digital conversion (A/D) for the radio-frequency signals received by the digital baseband receiving machine and the digital decimating filtering of the output signal of the digital lower frequency conversion. The filter is an Infinite Impulse Response (IIR) filter. The IIR filter is used to replacing the finite impulse response filter and be taken as the filter of the digital baseband receiving machine so as to reduce the order of the filter, thus reducing the operation quantity and the requirement to the hardware resource of the receiving machine; therefore, the chip area of the baseband receiving machine is saved and the system power dissipation of the baseband receiving machine is reduced. Furthermore, the IIR filter designed by the invention has the advantages of simple structure and stable performance.
Description
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of filter and method for designing thereof that is used for digital baseband receiver.
Background technology
Along with development of wireless communication devices, the performance requirement of the digital baseband receiver of receiving terminal in the wireless communication system is also improved day by day.The radiofrequency signal that digital baseband receiver receives is through obtaining the inphase/quadrature phase (I/Q of base band behind analog to digital converter (ADC), digital down converter (DDS) and the decimation filter of digital, In-phase/Quadrature-phase) data, then the I/Q data are passed through differential ference spiral device, frequency deinterleaver, quadriphase PSK (QPSK) de-mapping device, time de-interweaving device and Viterbi (Viterbi) decoder again and are demodulated digital signal.Wherein, the effect of decimation filter of digital is that the arrowband bandpass signal that will import becomes the low pass baseband signal, can effectively suppress simultaneously mirror image interference and neighbour disturbs frequently, the noise signal that the filtering band is outer, improve signal to noise ratio, therefore, the performance of filter will directly have influence on the performance of digital baseband receiver.
Decimation filter of digital in digital baseband receiver adopts finite impulse response (FIR, Finite Impulse Response) filter usually.What for example, the patent No. was that Chinese invention patent, the application number of ZL97192069.9 be that 98812821.7 Chinese invention patent application, application number be that 02815462.2 Chinese invention patent application, the patent No. be that the decimation filter mentioned in the Chinese invention patent of ZL03158877.8 adopts all is the FIR filter.The advantage of FIR filter is stable performance, and simplicity of design realizes linear phase characteristic easily, and implementation structure is efficiently also arranged.In general, the exponent number of FIR filter is high more, just means better filtering performance.
Yet, the FIR filter be utilize its coefficient parameter and input data mutually multiply accumulating realize that so its operand is also along with the increase of exponent number is the geometric progression multiplication, this also means the hardware requirement of more hardware resource of needs and Geng Gao.And under the very high situation of receiver technical requirement, especially at digital audio broadcasting (DAB towards mobile reception, Digital Audio Broadcast) in the digital baseband receiver, for satisfying the requirement of high filtering performance, it is inevitable adopting high order FIR filter, and high order FIR filter is more to the demand of hardware resource, and the chip area that this not only can increase band receiver of base also can bring higher system power consumption.
Summary of the invention
The problem that the present invention solves is, a kind of filter that is used for digital baseband receiver is provided, and its operand is little, it is low that the receiver hardware resource is required and takies, so can save band receiver of base chip area, reduce the system power consumption of band receiver of base.
For addressing the above problem, the invention provides a kind of filter that is used for digital baseband receiver, described filter is used for the radiofrequency signal that described digital baseband receiver receives is carried out digital decimation filtering through the output signal of analog-to-digital conversion, Digital Down Convert, and described filter is an infinite impulse response filter.
According to preferred embodiment of the present invention, described digital baseband receiver is a digital audio broadcast receiver.Described filter is a low pass filter.Described infinite impulse response filter is a lattice digital filter.The exponent number of described filter is to determine according to the technical indicator of filter.Wherein, the technical indicator of described filter is meant that the passband ripple coefficient of filter output is 0.5dB, and stopband attenuation is 50dB, and cut-off frequency is 0.78MHz.The exponent number of described lattice digital filter is more than or equal to 9 rank, and preferably, described filter is 9 rank lattice digital filters.The exponent number of described filter is meant the number of filter elementary cell.Described 9 rank lattice digital filters comprise 9 filter elementary cells, 9 delayers, first adder, first multiplier, input signal, first intermediate output signal, second intermediate output signal and output signal, wherein, input signal obtains first intermediate output signal through 5 cascaded filter elementary cells and delayer, input signal obtains second intermediate output signal through other 4 cascaded filter elementary cells and delayer, and first intermediate output signal and second intermediate output signal obtain output signal through the first adder and first multiplier.Described filter elementary cell is an elliptic filters.Described elliptic filters comprises negative feedback amplifier, second adder, the 3rd adder, the 4th adder, second multiplier, input, the feedback input, feedback output and output, wherein, described input is through exporting in the middle of obtaining with feedback input process second adder, second multiplier behind the described negative feedback amplifier, described input and middle output obtain described output through the 3rd adder, and described feedback input and middle output obtain described feedback output through the 4th adder.Wherein, the coefficient of described second multiplier is to determine that according to the exponent number of described lattice digital filter the exponent number of described lattice digital filter is 9 rank.The span of the coefficient of described multiplier is [1,1], and more preferably, the span of the coefficient of described multiplier is (0,0.5).
Corresponding to the above-mentioned filter that is used for digital baseband receiver, the present invention also provides a kind of Filter Design method, comprises the steps: to determine that described filter is an infinite impulse response filter; Determine the technical indicator of described filter; Determine the type of described infinite impulse response filter, the type of filter elementary cell and the exponent number of infinite impulse response filter according to the technical indicator of described filter.
According to preferred embodiment of the present invention, described digital baseband receiver is a digital audio broadcast receiver.Described filter is a low pass filter.The type of determined infinite impulse response filter is a lattice digital filter.Described technical indicator is meant that the passband ripple coefficient of filter output is 0.5dB, and stopband attenuation is 50dB, and cut-off frequency is 0.78MHz.The exponent number of described lattice digital filter is more than or equal to 9 rank, and the exponent number of described filter is meant the number of filter elementary cell.Preferably, described filter is 9 rank lattice digital filters.Described 9 rank lattice digital filters comprise 9 filter elementary cells, 9 delayers, first adder, first multiplier, input signal, first intermediate output signal, second intermediate output signal and output signal, wherein, input signal obtains first intermediate output signal through 5 cascaded filter elementary cells and delayer, input signal obtains second intermediate output signal through other 4 cascaded filter elementary cells and delayer, and first intermediate output signal and second intermediate output signal obtain output signal through the first adder and first multiplier.The type of described filter elementary cell is an elliptic filters.Described elliptic filters comprises negative feedback amplifier, second adder, the 3rd adder, the 4th adder, second multiplier, input, the feedback input, feedback output and output, wherein, described input is through exporting in the middle of obtaining with feedback input process second adder, second multiplier behind the described negative feedback amplifier, described input and middle output obtain described output through the 3rd adder, and described feedback input and middle output obtain described feedback output through the 4th adder.Described Filter Design method also comprises the coefficient of determining described second multiplier according to the exponent number of described lattice digital filter.Wherein, the exponent number of described lattice digital filter is 9 rank.The span of the coefficient of described second multiplier is [1,1].More preferably, the span of the coefficient of described second multiplier is (0,0.5).
Compared with prior art, technique scheme adopts the decimation filter of low order infinite impulse response filter as band receiver of base, its operand is much smaller with respect to the operand of high-order limited impact response filter, therefore can reduce the requirement of the hardware resource of band receiver of base and take, so not only save the chip area of band receiver of base, also reduced the system power dissipation of band receiver of base.
In addition, the designed infinite impulse response filter of technique scheme is the lattice filter that is made of elliptic filters, it is simple in structure, hardware designs and realization are convenient, not only can accomplish the desired technical indicator that meets the filter of digital audio broadcast receiver standard, and overcome the linear relatively poor shortcoming of the unstable properties that infinite impulse response filter may exist in the prior art, phase characteristic.
Description of drawings
Fig. 1 is the structural representation of the lattice digital filter of the embodiment of the invention;
Fig. 2 is the structural representation of the elementary cell of lattice digital filter shown in Figure 1;
Fig. 3 is the amplitude-frequency characteristic figure to the output emulation gained of lattice digital filter shown in Figure 1;
Fig. 4 is the phase-frequency characteristic figure to the output emulation gained of lattice digital filter shown in Figure 1;
Fig. 5 is the step schematic diagram of method for designing of the lattice digital filter of the embodiment of the invention.
Embodiment
Technical scheme of the present invention is to adopt the decimation filter of digital of infinite impulse response (IIR) filter as digital baseband receiver.Generally speaking, for same wave filter technology index, the desired exponent number of finite impulse response (FIR) filter is higher 5 to 10 times than iir filter, therefore, adopting iir filter to replace the FIR filter is exactly to reduce operand and to the requirement of the hardware resource of receiver with take by the exponent number that reduces filter as the filter of digital baseband receiver.
Under identical technical indicator, iir filter can satisfy the requirement of index with the exponent number that lacks than the FIR filter, be that iir filter can obtain high frequency selectivity with lower exponent number, used memory cell hardware resource few, that take is low, operand is little and efficient is high, but this high efficiency is to be cost with phase place non-linear, frequency selectivity is good more, and then phase nonlinear is serious more.And with respect to the FIR filter, iir filter has more complicated structure, more be difficult to design and analyze, simultaneously owing to exist the feedback of output to input, thereby iir filter also exists because the disturbance of input makes this performance of filter unsettled possibility that becomes.And the designed iir filter of the present invention has overcome above-mentioned shortcoming, have stable performance, phase linearity characteristic, hardware realize characteristic of simple preferably, below promptly in conjunction with the accompanying drawings 1 and Fig. 2 and preferred embodiment the specific embodiment of the present invention is described in detail.
In the present embodiment, described digital baseband receiver is digital audio broadcasting (DAB) receiver, and it comprises analog to digital converter (ADC), digital down converter (DDS), decimation filter of digital, differential ference spiral device, frequency deinterleaver, quadriphase PSK (QPSK) de-mapping device, time de-interweaving device and Viterbi (Viterbi) decoder.Wherein, described decimation filter of digital is an iir filter, and it is that the arrowband bandpass signal that will import becomes the low pass baseband signal, and therefore, described iir filter is a low pass filter, is used for the HF noise signal of filtering greater than cut-off frequency.
Iir filter has multiple structure, for example, and linear pattern, cascade connection type, parallel connection type, lattice type etc.Consider amount of calculation, memory space, implementation complexity, finite word length effect error noise signal factor to aspects such as the influence of output, convenience that filter parameter is adjusted and stability, in the present embodiment, the iir filter that is applied in the DAB receiver adopts lattice digital filter, its exponent number is to determine that according to the technical indicator of filter the exponent number of described filter is meant the number of filter elementary cell.For given technical indicator, the realization exponent number minimum of elliptic filters, or under same exponent number condition, the transition band of elliptic filters (passband is to the zone of stopband) steepest, what therefore, the filter elementary cell of above-mentioned lattice digital filter adopted is elliptic filters.
In the present embodiment, acceptance criteria according to the DAB receiver, it is 0.5dB that the technical indicator of filter is defined as the passband ripple coefficient, stopband attenuation is 50dB, cut-off frequency is 0.78MHz, the exponent number minimum of the lattice digital filter of the technical indicator that satisfies above-mentioned filter that calculates by computer aided design software (as the Design of Filter instrument of MATLAB software) is 9 rank, Design of Filter instrument designing filter with MATLAB software is a technology well-known to those skilled in the art, promptly will not launch explanation at this.What present embodiment was selected is 9 rank lattice digital filters, and to reduce the requirement to hardware resource to the full extent, its structure as shown in Figure 1.Lattice digital filter shown in Fig. 1 comprises filter elementary cell 11, delayer 12, first adder 13, first multiplier 14, input signal IN, the first intermediate output signal OUT1, the second intermediate output signal OUT2 and output signal OUT.Wherein, elementary cell 11 is elliptic filters, and it comprises input A1, feedback input A2, and feedback output B1 and output B2, the concrete structure of relevant elliptic filters will elaborate in the back.Input signal IN obtains the first intermediate output signal OUT1 through 5 cascaded filter elementary cells 11 and delayer 12, input signal IN obtains the second intermediate output signal OUT2 through other 4 cascaded filter elementary cells 11 and delayer 12, and the first intermediate output signal OUT1 and the second intermediate output signal OUT2 are that 0.5 first multiplier 14 obtains output signal OUT through first adder 13 and coefficient.
What the filter elementary cell 11 of above-mentioned lattice digital filter adopted is elliptic filters, and its structure as shown in Figure 2.Elliptic filters shown in Figure 2 comprises negative feedback amplifier 21, second adder 22, the 3rd adder 23, the 4th adder 24, second multiplier 25, input A1, feedback input A2, feedback output B1 and output B2, wherein, described input A1 imports A2 through second adder 22 through described negative feedback amplifier 21 backs and feedback, output A3 in the middle of second multiplier 25 obtains, described input A1 and middle output A3 obtain described output B2 through the 3rd adder 23, and described feedback input A2 and middle output A3 obtain described feedback output B1 through the 4th adder 24.
The coefficient a of second multiplier 25 of elliptic filters determines according to the exponent number of the technical indicator of filter and lattice digital filter.In the present embodiment, acceptance criteria according to the DAB receiver, it is 0.5dB that the technical indicator of filter is defined as the passband ripple coefficient, stopband attenuation is 50dB, cut-off frequency is 0.78MHz, the exponent number of filter is 9 rank, the span of the coefficient a of the multiplier 25 of each elliptic filters of technical indicator that satisfies above-mentioned filter that calculates by computer aided design software (as the Design of Filter instrument of MATLAB software) is-1 to 1, comprise-1 and 1, promptly span is [1,1], because the coefficient of multiplier is more little, the hardware resource that takies is few more, therefore, can the span of the coefficient a of multiplier 25 be narrowed down to 0 to 0.5 by optimal design, do not comprise 0 and 0.5, be that span is (0,0.5), thereby further reduced requirement hardware resource.
Please continue with reference to figure 3 and Fig. 4, Fig. 3 provides the amplitude-frequency characteristic figure to the output emulation gained of 9 rank iir filters of above-mentioned design, and as shown in Figure 3, the output amplitude in the passband is approached straight line, around the undulating value of output amplitude average, promptly the passband ripple coefficient is near 0.5dB; In 0.707 times of frequency of locating of the output amplitude average of passband, promptly the cut-off frequency of filter is about 0.8MHz, near the desired 0.78MHz of technical indicator; Passband is very steep to the transition band between stopband, almost is the straight line decay, and passband is about 50dB to the attenuation amplitude of stopband.Therefore, designed iir filter meets the technical indicator of above-mentioned definite filter, and if will satisfy same technical indicator, designed FIR filter needs 100 rank, and it is much larger than needed 9 rank of iir filter.Fig. 4 provides the phase-frequency characteristic figure to the output emulation gained of 9 rank iir filters of above-mentioned design, the phase characteristic of the filter that (approaches cut-off frequency) among Fig. 4 in the 0.8MHz scope is approached linearity, and just designed iir filter has the better linearity phase characteristic.From Fig. 3 and Fig. 4 as can be seen, 9 designed rank iir filters of technique scheme have amplitude-frequency and phase-frequency characteristic preferably, not only meet the desired technical indicator of decimation filter of DAB receiver, and stable performance, have the better linearity phase characteristic.
Corresponding to the above-mentioned filter that is used for digital baseband receiver, the present invention also provides a kind of Filter Design method, described filter is used for the radiofrequency signal that described digital baseband receiver receives is carried out digital decimation filtering through the output signal of analog-to-digital conversion, Digital Down Convert, described digital baseband receiver is a digital audio broadcast receiver, and described filter is a low pass filter.As shown in Figure 5, this method execution in step S51 at first.
In step S51, determine that described filter is an iir filter.Decimation filter of digital in the prior art in the digital baseband receiver adopts the FIR filter, and its operand is big, and hardware resource is taken and require height.For same wave filter technology index, the desired exponent number of FIR filter is higher 5 to 10 times than iir filter, therefore, determine that decimation filter of digital in the digital baseband receiver adopts iir filter to reduce operand and to the requirement of the hardware resource of receiver with take.Follow execution in step S52.
In step S52, determine the technical indicator of described filter.In the present embodiment, according in June, the 2006 formal digital audio broadcasting (DAB that implements of China, Digital Audio Broadcast) national standard (GY/T214.2006), it is 0.5dB that the technical indicator of filter is defined as the passband ripple coefficient, stopband attenuation is 50dB, and cut-off frequency is 0.78MHz.Then carry out step S53.
In step S53, determine the type of described iir filter, the type of filter elementary cell and the exponent number of infinite impulse response filter according to the technical indicator of described filter.At first, consider amount of calculation, memory space, implementation complexity, the finite word length effect error noise signal factor to aspects such as the influence of output, convenience that filter parameter is adjusted and stability, the type of determining iir filter is a lattice digital filter.Secondly, for given technical indicator, the realization exponent number minimum of elliptic filters, or under same exponent number condition, the transition band of elliptic filters (passband is to the zone of stopband) steepest, therefore, what determine that the filter elementary cell of above-mentioned lattice digital filter adopts is elliptic filters, its structure is refused repeat specification at this as shown in Figure 2.Then, according to the technical indicator of the determined filter of step S52, the exponent number minimum of the lattice digital filter of the technical indicator that satisfies above-mentioned filter that calculates by computer aided design software is 9 rank.At last, the exponent number of the lattice digital filter of present embodiment is chosen as 9 rank, to reduce requirement to the full extent to hardware resource, the span of coefficient that calculates second multiplier of elliptic filters by computer aided design software is [1 thus, 1], by optimal design this span is contracted to (0,0.5), thereby has further reduced requirement hardware resource.
According to the resulting filter construction that is used for digital baseband receiver of the method for designing of step S51 to S53 as shown in Figure 1, it is described in detail in the explanation of above-mentioned filter, promptly refuses repeat specification at this.
In sum, technique scheme has the following advantages:
(1) adopts the decimation filter of low order iir filter as band receiver of base, its operand is much smaller with respect to the operand of high order FIR filter, therefore can reduce the requirement of the hardware resource of band receiver of base and take, so not only save the chip area of band receiver of base, also reduced the system power dissipation of band receiver of base.
(2) iir filter is the 9 rank lattice digital filters that are made of elliptic filters, it is simple in structure, hardware designs and realization are convenient, not only can accomplish the technical indicator of the filter of the desired DAB of meeting receiver standard, and the shortcoming that has overcome the unstable properties that iir filter may exist, had relatively poor linear phase characteristic.
(3) span of the multiplier coefficients of elliptic filters narrows down to (0,0.5) from [1,1], can further reduce the requirement of hardware resource and takies by the coefficient that reduces multiplier.
Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (29)
1. filter that is used for digital baseband receiver, described filter is used for the radiofrequency signal that described digital baseband receiver receives is carried out digital decimation filtering through the output signal of analog-to-digital conversion, Digital Down Convert, it is characterized in that described filter is an infinite impulse response filter.
2. filter according to claim 1 is characterized in that described digital baseband receiver is a digital audio broadcast receiver.
3. filter according to claim 1 is characterized in that described filter is a low pass filter.
4. according to claim 1 or 2 or 3 described filters, it is characterized in that described infinite impulse response filter is a lattice digital filter.
5. filter according to claim 4 is characterized in that, the exponent number of described filter is to determine according to the technical indicator of filter.
6. filter according to claim 5 is characterized in that, described technical indicator is meant that the passband ripple coefficient of filter output is 0.5dB, and stopband attenuation is 50dB, and cut-off frequency is 0.78MHz.
7. filter according to claim 6 is characterized in that, the exponent number of described lattice digital filter is more than or equal to 9 rank, and the exponent number of described filter is meant the number of filter elementary cell.
8. filter according to claim 7 is characterized in that, described filter is 9 rank lattice digital filters.
9. filter according to claim 8, it is characterized in that, described 9 rank lattice digital filters comprise 9 filter elementary cells, 9 delayers, first adder, first multiplier, input signal, first intermediate output signal, second intermediate output signal and output signal, wherein, input signal obtains first intermediate output signal through 5 cascaded filter elementary cells and delayer, input signal obtains second intermediate output signal through other 4 cascaded filter elementary cells and delayer, and first intermediate output signal and second intermediate output signal obtain output signal through the first adder and first multiplier.
10. filter according to claim 6 is characterized in that, described filter elementary cell is an elliptic filters.
11. filter according to claim 10, it is characterized in that, described elliptic filters comprises negative feedback amplifier, second adder, the 3rd adder, the 4th adder, second multiplier, input, the feedback input, feedback output and output, wherein, described input is through importing through second adder with feedback behind the described negative feedback amplifier, output in the middle of second multiplier obtains, described input and middle output obtain described output through the 3rd adder, and described feedback input and middle output obtain described feedback output through the 4th adder.
12. filter according to claim 11 is characterized in that, the coefficient of described second multiplier is to determine according to the exponent number of described lattice digital filter.
13. filter according to claim 12 is characterized in that, the exponent number of described lattice digital filter is 9 rank.
14. filter according to claim 13 is characterized in that, the span of the coefficient of described second multiplier is [1,1].
15. filter according to claim 14 is characterized in that, the span of the coefficient of described second multiplier is (0,0.5).
16. Filter Design method that is used for digital baseband receiver, described filter is used for the radiofrequency signal that described digital baseband receiver receives is carried out digital decimation filtering through the output signal of analog-to-digital conversion, Digital Down Convert, it is characterized in that described method comprises the steps:
Determine that described filter is an infinite impulse response filter;
Determine the technical indicator of described filter;
Determine the type of described infinite impulse response filter, the type of filter elementary cell and the exponent number of infinite impulse response filter according to the technical indicator of described filter.
17. method according to claim 16 is characterized in that, described digital baseband receiver is a digital audio broadcast receiver.
18. method according to claim 16 is characterized in that, described filter is a low pass filter.
19., it is characterized in that the type of determined infinite impulse response filter is a lattice digital filter according to claim 16 or 17 or 18 described methods.
20. method according to claim 19 is characterized in that, described technical indicator is meant that the passband ripple coefficient of filter output is 0.5dB, and stopband attenuation is 50dB, and cut-off frequency is 0.78MHz.
21. method according to claim 20 is characterized in that, the exponent number of described lattice digital filter is more than or equal to 9 rank, and the exponent number of described filter is meant the number of filter elementary cell.
22. method according to claim 21 is characterized in that, described filter is 9 rank lattice digital filters.
23. method according to claim 22, it is characterized in that, described 9 rank lattice digital filters comprise 9 filter elementary cells, 9 delayers, first adder, first multiplier, input signal, first intermediate output signal, second intermediate output signal and output signal, wherein, input signal obtains first intermediate output signal through 5 cascaded filter elementary cells and delayer, input signal obtains second intermediate output signal through other 4 cascaded filter elementary cells and delayer, and first intermediate output signal and second intermediate output signal obtain output signal through the first adder and first multiplier.
24. method according to claim 21 is characterized in that, the type of described filter elementary cell is an elliptic filters.
25. method according to claim 24, it is characterized in that, described elliptic filters comprises negative feedback amplifier, second adder, the 3rd adder, the 4th adder, second multiplier, input, the feedback input, feedback output and output, wherein, described input is through importing through second adder with feedback behind the described negative feedback amplifier, output in the middle of second multiplier obtains, described input and middle output obtain described output through the 3rd adder, and described feedback input and middle output obtain described feedback output through the 4th adder.
26. method according to claim 25 is characterized in that, also comprises the coefficient of determining described second multiplier according to the exponent number of described lattice digital filter.
27. method according to claim 26 is characterized in that, the exponent number of described lattice digital filter is 9 rank.
28. filter according to claim 27 is characterized in that, the span of the coefficient of described second multiplier is [1,1].
29. filter according to claim 28 is characterized in that, the span of the coefficient of described second multiplier is (0,0.5).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101977020A (en) * | 2010-02-26 | 2011-02-16 | 京信通信系统（中国）有限公司 | Digital up/down frequency conversion system and implementation method thereof |
| CN102118330A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Filtering system and method thereof |
| CN102185585A (en) * | 2011-02-25 | 2011-09-14 | 浙江工业大学 | Lattice type digital filter based on genetic algorithm |
| CN102664646A (en) * | 2011-05-17 | 2012-09-12 | 杭州畅鼎科技有限公司 | Filtering method for optimizing parameters by adopting genetic algorithm and nonlinear convex programming theory |
| CN106094509A (en) * | 2016-06-22 | 2016-11-09 | 广东电网有限责任公司电力科学研究院 | A kind of LCR filtering control method and device |
| CN109379059A (en) * | 2018-09-18 | 2019-02-22 | 宁波迦南智能电气股份有限公司 | Down-sampled processing method in a kind of efficient LTE system |
| CN117792338A (en) * | 2024-02-27 | 2024-03-29 | 南京朗立微集成电路有限公司 | Filter and design method thereof |
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- 2007-05-28 CN CNA2007100413555A patent/CN101316102A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102118330A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Filtering system and method thereof |
| CN102118330B (en) * | 2009-12-31 | 2014-10-22 | 中兴通讯股份有限公司 | Filtering system and method thereof |
| CN101977020A (en) * | 2010-02-26 | 2011-02-16 | 京信通信系统（中国）有限公司 | Digital up/down frequency conversion system and implementation method thereof |
| CN102185585A (en) * | 2011-02-25 | 2011-09-14 | 浙江工业大学 | Lattice type digital filter based on genetic algorithm |
| CN102185585B (en) * | 2011-02-25 | 2014-06-11 | 浙江工业大学 | Lattice type digital filter based on genetic algorithm |
| CN102664646A (en) * | 2011-05-17 | 2012-09-12 | 杭州畅鼎科技有限公司 | Filtering method for optimizing parameters by adopting genetic algorithm and nonlinear convex programming theory |
| CN106094509A (en) * | 2016-06-22 | 2016-11-09 | 广东电网有限责任公司电力科学研究院 | A kind of LCR filtering control method and device |
| CN109379059A (en) * | 2018-09-18 | 2019-02-22 | 宁波迦南智能电气股份有限公司 | Down-sampled processing method in a kind of efficient LTE system |
| CN117792338A (en) * | 2024-02-27 | 2024-03-29 | 南京朗立微集成电路有限公司 | Filter and design method thereof |
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