CN104579177A - Digital down-conversion circuit suitable for filtering multi-tone modulation system - Google Patents
Digital down-conversion circuit suitable for filtering multi-tone modulation system Download PDFInfo
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- CN104579177A CN104579177A CN201410658162.4A CN201410658162A CN104579177A CN 104579177 A CN104579177 A CN 104579177A CN 201410658162 A CN201410658162 A CN 201410658162A CN 104579177 A CN104579177 A CN 104579177A
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Abstract
The invention provides a digital down-conversion circuit suitable for a filtering multi-tone (FMT) modulation system, and aims to providing the digital down-conversion circuit which does not extract operation results of low-pass filters, can reduce the operation frequencies of the filters and reduce hardware resources and power consumption of equipment and is suitable for an FMT system according to the characteristics of an FMT signal. The digital down-conversion circuit is implemented by the following technical scheme: the working frequencies of M parallel frequency mixers are the same as the AD (analogue and digital) sampling rate fs, and the working frequencies of the parallel low-pass filters are fs/M; the M parallel low-pass filters 102 comprise K registers connected in series to the output ends of serial/parallel converters in sequence; the K registers are provided with K filter coefficients and are connected with an accumulator through K multipliers 204; an AD sampling signal passes through the M parallel frequency mixers, and a signal subjected to frequency mixing is sent into the serial/parallel converters 201 and passes through the M parallel low-pass filters 102 to obtain M digital baseband signals; M is the number of subcarriers of the FMT system and a natural number, and K is the number of orders of the filters and a natural number and is larger than or equal to M.
Description
Technical field
The present invention relates to a kind of communication system signal process field, be applicable to the Digital Down Convert circuit of filtering multitone modulation (FMT) system receiver design.
Background technology
Having anti-ISI (ISI) and be a broadband transmission techniques at present except OFDM, SC-FDE to the filtering multitone modulation technique (FMT) of the advantage such as frequency deviation is insensitive, is a kind of emerging multi-carrier modulation technology similar with OFDM.Filtering multitone modulation technique is the subchannel of several band limitings and non-overlapping copies by whole channel distribution by bank of filters, on these subbands, carry out the parallel transmission of information with multiple subcarrier: at transmitting terminal, by frequency converter by M road independently modulation signal move on M subcarrier of frequency spectrum non-overlapping copies; At receiving terminal, by the frequency mixer of different frequency and the combination of low pass filter the M of a frequency spectrum non-overlapping copies subcarrier separated and carry out demodulation separately.FMT system has the spectrum containment of height, effectively inhibits interchannel interference (ICI), thus to avoid in radio communication ofdm system to frequency deviation sensitiveness this insoluble problem strong.
Digital down converter is the key components of wideband digital receiver, and the Digital Down Convert circuit generally adopted in current FMT system first carries out mixing, then carry out low-pass filtering, finally extracts, as shown in Figure 3.The operating frequency of adopting low pass filter in this way must be identical with signal sampling rate, needs the partial arithmetic result of low pass filter to give up when extracting after filtering, objectively causes the waste of low pass filter operation amount.Because FMT receiver needs to use M low pass filter, when signal bandwidth is wider, signal sampling rate is very high, the speed of mixing and filtering is all very high, operand needed for Digital Down Convert is very large, so more hardware resource can be taken based on the FMT system digits lower frequency changer circuit of classical architecture, very large difficulty is caused to applying of FMT system.
Summary of the invention
The present invention is directed to the problems referred to above, according to the feature of FMT signal, provide a kind of can not extraction the operation result of low pass filter, reduce filter running frequency, and then reduce hardware resource and equipment power dissipation, be applicable to the Digital Down Convert circuit of FMT system.
Above-mentioned purpose of the present invention can be reached by following measures.A kind of Digital Down Convert circuit being applicable to filtering multitone modulating system, the frequency mixer 101 comprising M parallel connection and M the parallel low pass filter 102 of connecting with M frequency mixer 101, it is characterized in that: AD sampled signal is by sending into M parallel low pass filter 102 after the frequency mixer 101 of M parallel connection, obtain M railway digital baseband signal, the operating frequency of frequency mixer 101 is identical with AD sampling rate fs, and the operating frequency of parallel low pass filter 102 is fs/M; Parallel low pass filter 102 comprises K register 202, K registers 202 on serial/parallel conversion device 201M output in sequential series with K filter coefficient 203, connects accumulator 205 by K multiplier 204.Wherein M is the subcarrier number of FMT system, and M is natural number, and K is filter order, and K is natural number, and K >=M.
The present invention compared to existing technology, has following beneficial effect:
The invention provides a kind of Digital Down Convert circuit being applicable to FMT system, according to the feature of FMT signal, provide a kind of Digital Down Convert circuit that can not extract the operation result of low pass filter.Shown in the present invention and Fig. 3 first carry out low-pass filtering carry out again the classical architecture extracted FMT system digits lower frequency changer circuit equivalence, but the operand of Digital Down Convert circuit median filter provided by the invention and operating frequency are only the 1/M of classical architecture, effectively can reduce the hardware resource needed for FMT system digits lower frequency changer circuit and power consumption.
The present invention is particularly suitable for the design of FMT system receiver Digital Down Convert circuit.
Accompanying drawing explanation
Fig. 1 is the Digital Down Convert circuit theory schematic diagram of the proposed by the invention FMT system that is applicable to.
Fig. 2 is the principle schematic of parallel low pass filter in Fig. 1.
Fig. 3 is the FMT system digits lower frequency changer circuit principle schematic based on classical architecture.
In figure: 101 frequency mixers, 102 parallel low pass filters; 201 serial/parallel conversion devices, 202 registers, 203 filter coefficients, 204 multipliers, 205 accumulators; 301 frequency mixers, 302 low pass filters, 303 withdrawal devices.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Consult Fig. 1.In embodiment described below, the Digital Down Convert circuit of the FMT system that is applicable to that the present invention proposes, the frequency mixer 101 comprising M parallel connection and M the parallel low pass filter 102 of connecting with M frequency mixer 101.AD sampled signal is by sending into M parallel low pass filter 102 after the frequency mixer 101 of M parallel connection, and obtain M railway digital baseband signal, the operating frequency of frequency mixer 101 is identical with AD sampling rate fs, and the operating frequency of parallel low pass filter 102 is fs/M.Wherein M is the subcarrier number of FMT system, and M is natural number, and K is filter order, and K is natural number, and K >=M.
Consult Fig. 2.Parallel low pass filter 102 comprises serial/parallel conversion device 201, a K register 202, a K filter coefficient 203, a K multiplier 204, accumulator 205.Each road output K/M in sequential series register 202 of serial/parallel conversion device 201, K register 202 and K filter coefficient 203, K multiplier 204 one_to_one corresponding, signal after each road mixing obtains M road parallel signal stream after serial/parallel conversion device 201, each road output of serial/parallel conversion device 201 connects K/M register 202 successively, shift LD is carried out under the control of clock, K register 202 and K filter coefficient 203 send into accumulator 205 by the result after K multiplier 204 is multiplied simultaneously, a railway digital baseband signal is obtained after accumulator 205 is added.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. one kind is applicable to the Digital Down Convert circuit of filtering multitone modulating system, the frequency mixer 101 comprising M parallel connection and M the parallel low pass filter (102) of connecting with M frequency mixer (101), it is characterized in that: AD sampled signal sends into M parallel low pass filter (102) afterwards by the frequency mixer (101) of M parallel connection, obtain M railway digital baseband signal, the operating frequency of frequency mixer (101) is identical with AD sampling rate fs, and the operating frequency of parallel low pass filter (102) is fs/M;
Parallel low pass filter (102) comprises K register (202) on serial/parallel conversion device (201) M output in sequential series, K register (202) is with K filter coefficient (203), accumulator (205) is connected by K multiplier (204), wherein M is the subcarrier number of FMT system, M is natural number, K is filter order, and K is natural number, and K >=M.
2. be applicable to the Digital Down Convert circuit of filtering multitone modulating system as claimed in claim 1, it is characterized in that: each a road output K/M in sequential series register (202) of serial/parallel conversion device (201), K register (202) and K filter coefficient (203), a K multiplier (204) one_to_one corresponding.
3. be applicable to the Digital Down Convert circuit of filtering multitone modulating system as claimed in claim 1 or 2, it is characterized in that: the signal after frequency mixer (101) of often leading up to obtains M road parallel signal stream after serial/parallel conversion device (201), each road output of serial/parallel conversion device (201) connects K/M register (202) successively, shift LD is carried out under the control of clock, K register (202) and K filter coefficient (203) send into accumulator (205) by the result after K multiplier (204) is multiplied simultaneously, a railway digital baseband signal is obtained after accumulator (205) is added.
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| CN201410658162.4A CN104579177A (en) | 2014-11-18 | 2014-11-18 | Digital down-conversion circuit suitable for filtering multi-tone modulation system |
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| CN201410658162.4A CN104579177A (en) | 2014-11-18 | 2014-11-18 | Digital down-conversion circuit suitable for filtering multi-tone modulation system |
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Cited By (4)
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| CN106059981A (en) * | 2016-06-23 | 2016-10-26 | 中国科学院电子学研究所 | Demodulation method and device |
| CN107911327A (en) * | 2017-10-30 | 2018-04-13 | 北京遥测技术研究所 | Ship VDES systems based on FMT multi-carrier modulations demodulation method and modulation demodulation system |
| CN110808713A (en) * | 2018-08-06 | 2020-02-18 | 海鹰航空通用装备有限责任公司 | FPGA-based multi-path parallel demodulation method for ultra-high-speed frequency division signals |
| CN114252722A (en) * | 2022-01-21 | 2022-03-29 | 上海创远仪器技术股份有限公司 | High-bandwidth vector network analyzer system for realizing vector signal receiving and transmitting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059981A (en) * | 2016-06-23 | 2016-10-26 | 中国科学院电子学研究所 | Demodulation method and device |
| CN107911327A (en) * | 2017-10-30 | 2018-04-13 | 北京遥测技术研究所 | Ship VDES systems based on FMT multi-carrier modulations demodulation method and modulation demodulation system |
| CN107911327B (en) * | 2017-10-30 | 2020-12-18 | 北京遥测技术研究所 | FMT-based multi-carrier modulation and demodulation method and system for ship VDES system |
| CN110808713A (en) * | 2018-08-06 | 2020-02-18 | 海鹰航空通用装备有限责任公司 | FPGA-based multi-path parallel demodulation method for ultra-high-speed frequency division signals |
| CN110808713B (en) * | 2018-08-06 | 2023-06-13 | 海鹰航空通用装备有限责任公司 | Ultrahigh-speed frequency division signal multipath parallel demodulation method based on FPGA |
| CN114252722A (en) * | 2022-01-21 | 2022-03-29 | 上海创远仪器技术股份有限公司 | High-bandwidth vector network analyzer system for realizing vector signal receiving and transmitting |
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