CN107707266B - Broadband high-speed frequency hopping transmitting system - Google Patents

Broadband high-speed frequency hopping transmitting system Download PDF

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CN107707266B
CN107707266B CN201711044747.7A CN201711044747A CN107707266B CN 107707266 B CN107707266 B CN 107707266B CN 201711044747 A CN201711044747 A CN 201711044747A CN 107707266 B CN107707266 B CN 107707266B
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frequency
frequency hopping
module
hopping
interval
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CN107707266A (en
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费聚锋
马少飞
祁东杰
陈亢
李腾飞
赵兴宇
王召利
蒯立山
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Shanghai Radio Equipment Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7152—Interference-related aspects with means for suppressing interference

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a broadband high-speed frequency hopping transmitting system, which is characterized in that digital modulation, frequency hopping frequency control and broadband radio frequency digital-to-analog converter (DAC) control are carried out in an FPGA (field programmable gate array) in a software radio mode, so that the high-speed frequency hopping transmitting system with the frequency hopping bandwidth of 5GHz and the hopping speed of 80000 hops/second is realized, and the system is low in complexity, stable, reliable, small in size and low in cost.

Description

Broadband high-speed frequency hopping transmitting system
Technical Field
The invention relates to the technical field of frequency hopping communication, in particular to a broadband high-speed frequency hopping transmitting system.
Background
There are two common methods for implementing frequency hopping communication transmitters: superheterodyne frequency conversion frequency hopping, direct frequency conversion frequency hopping and the like.
A frequency hopping of L wave band adopted by a typical American link16 data chain is taken as an example, the intermediate frequency is 70MHz, the radio frequency band is 960MHz to 1215MHz, the frequency hopping bandwidth is 255MHz, and the frequency hopping rate is 76000 hops per second, a transmitting channel of the system consists of an intermediate frequency module, an intermediate frequency band-pass filter, an up-converter, a high-speed frequency hopping source, a radio frequency band-pass filter and other independent functional modules, according to the design scheme, the whole system is huge and complex, if a high-speed frequency hopping frequency source of a higher wave band is realized, special design is needed, one-stage frequency conversion is needed, good stability and good shock resistance are achieved, the design complexity is high, the volume is large, and the design cost is very high.
The direct frequency conversion frequency hopping method is that the frequency hopping bandwidth directly carried out by an integrated chip is relatively narrow, for example, in the patent 'a high-speed frequency hopping transmitter' (CN104426557A), a mode of DSP + FPGA + integrated module is adopted to realize the medium-frequency transmitter with the maximum frequency hopping bandwidth of 400MHz, a frequency band above 1GHz needs to be realized, one-stage up-conversion is also needed to be added, and the requirement of 5GHz ultra-wideband frequency hopping range required by the existing anti-interference communication can not be met.
In sum, the conventional frequency hopping transmitter has narrow frequency hopping bandwidth, slow hopping speed, large volume and high cost, and cannot balance the bandwidth, the hopping speed and the cost.
Disclosure of Invention
The invention aims to provide a broadband high-speed frequency hopping transmitting system which realizes broadband high-speed frequency hopping communication transmission in a miniaturized and low-cost manner under the conditions that the broadband range is 5GHz and the hopping rate is 80000 hops/second.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a broadband high-speed frequency hopping transmission system, comprising:
the time control parameter module is used for outputting time control parameters;
the coding framing module is used for processing the sent binary numerical information according to the time control parameter to form a data frame structure required by the OFDM baseband modulation module;
the OFDM baseband modulation module is used for modulating the sent data frame into an OFDM baseband signal stream;
the frequency hopping sequence generating module is used for generating a frequency hopping sequence according to the time control parameter;
the frequency control word module is used for generating wide-interval frequency control words according to the frequency hopping sequence;
the JESD204B interface control module is used for sending the OFDM baseband signal stream to the radio frequency DAC module;
the SPI interface control module is used for sending the frequency control word to the radio frequency DAC module;
the radio frequency DAC module is used for carrying out frequency hopping and digital-to-analog conversion on the sent OFDM baseband signal flow and the frequency control word to generate a required frequency hopping analog signal;
the filter amplifying circuit is used for filtering and amplifying the frequency hopping analog signal so as to complete the output of the intermediate frequency or radio frequency hopping signal;
the code framing module, the OFDM baseband modulation module, the time control parameter module, the frequency hopping sequence generation module, the frequency control word module, the JESD204B interface control module and the SPI interface control module are all realized through an FPGA.
The broadband high-speed frequency hopping transmission system comprises:
the radio frequency DAC module is a radio frequency digital-to-analog converter AD9164 chip.
The broadband high-speed frequency hopping transmission system comprises:
the frequency control word module converts a frequency hopping sequence into decimal numbers through linear operation of a modulus N to carry out frequency selection, judges whether the interval between the frequency point and the last frequency hopping point is larger than a preset fixed value, if so, directly selects the frequency point as a frequency hopping point control word to be output, if not, carries out wide-interval frequency hopping smooth substitution treatment on the frequency hopping sequence to obtain a wide-interval frequency hopping point, and outputs the wide-interval frequency hopping point as a frequency hopping point control word, wherein N is the total number of the frequency hopping points.
In the wideband high-speed frequency hopping transmitting system, the implementation method of the wide-interval frequency hopping smooth substitution comprises the following steps:
defining frequency point F ═ F in frequency hopping bandiI is more than or equal to |0 and less than or equal to 999| }, the minimum interval between frequency points is 5MHz, the minimum interval between adjacent pulses is 100MHz, as long as | f is satisfiedi+1-fiIf the frequency is not less than 100MHz, the frequency is a wide interval frequency hopping point, otherwise, the frequency is a narrow interval frequency hopping point; the correction relation of the narrow interval frequency hopping point is PN (i +1) ═ PN (i) + d]mod N, where N is the hopping frequencyThe point number is 1000, d is the frequency hopping interval number 20, and PN (i) is the frequency hopping frequency point.
Compared with the prior art, the invention has the following advantages: digital modulation, frequency hopping frequency control and broadband radio frequency digital-to-analog converter (DAC) control are carried out in the FPGA in a software radio mode, a high-speed frequency hopping transmitting system with the frequency hopping bandwidth of 5GHz and the hopping speed of 80000 hops/second is achieved, and the system is low in complexity, stable, reliable, small in size and low in cost.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a schematic block diagram of wide-interval frequency hopping hole generation in an embodiment of the present invention;
fig. 3 is a timing diagram of frequency control transmission in an embodiment of the present invention.
Detailed Description
The present invention will now be further described by way of the following detailed description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings.
As shown in fig. 1, a wideband high-speed frequency hopping transmission system includes a coding framing module 11, an OFDM baseband modulation module 12, a time control parameter module 14, a frequency hopping sequence generation module 15, a frequency control word module 16, a JESD204B interface control module 13, an SPI interface control module 17, a radio frequency DAC module, and a filter amplifying circuit 3.
The time control parameter module 14 is configured to output a time control parameter.
The coding framing module 11 is configured to process the sent binary numerical information according to the time control parameter to form a data frame structure required by the OFDM baseband modulation module 12, specifically, perform channel error correction coding, interleaving, scrambling, framing, serial-to-parallel conversion on digital information from the outside in the FPGA to form an OFDM symbol frame structure, and then perform Orthogonal Frequency Division Multiplexing (OFDM) modulation on the coded and framed data to generate a baseband OFDM modulation signal.
The OFDM baseband modulation module 12 is configured to modulate the OFDM baseband into an OFDM baseband signal stream, and has the characteristics of high bandwidth utilization and strong multipath fading resistance, and the modulation process includes quadrature amplitude phase modulation (QAM) mapping, IFFT transform operation, windowing function processing, parallel-to-serial conversion, and the like; and a frequency hopping sequence generating module 15, configured to generate a frequency hopping sequence according to the time control parameter.
The frequency control word module 16 is configured to generate wide-interval frequency control words according to a frequency hopping sequence, and design the wide-interval frequency control words to improve anti-interference capability, wherein the wider the word is, the less the word is interfered. Specifically, assuming that the interference bandwidth of the other party is 100MHz, one frequency point of one party is 30MHz, and the next frequency point is 150MHz, so that the other party cannot interfere with one party, as shown in fig. 3, a frequency control transmission timing diagram in this embodiment is shown, the output of a frequency hopping sequence is controlled according to a certain timing cycle in the FPGA according to a time control parameter, a frequency control word is determined according to the output frequency hopping sequence, and then the frequency control word is sent to the radio frequency DAC module 2 through the SPI interface control module 17 under frequency change enable control to perform frequency control, so as to generate a required frequency hopping frequency; the JESD204B interface control module 13 is used for sending the OFDM baseband signal stream into the radio frequency DAC module 2 through the JESD204B high-speed serial interface.
The SPI control module 17 is configured to send the frequency control word to the rf DAC module 2 through the SPI interface.
The radio frequency DAC module 2 is used for performing frequency hopping and digital-to-analog conversion on the sent OFDM baseband signal stream and the frequency control word to generate a required frequency hopping analog signal, in the embodiment, the radio frequency DAC module 2 modulates the OFDM baseband modulation signal to a radio frequency range of 0-5 GHz through DDS modulation and digital-to-analog change of the radio frequency DAC.
The filter amplifying circuit 3 comprises a low-pass filter and a driving amplifier, and is used for filtering and amplifying the frequency hopping analog signal so as to complete the output of the intermediate frequency or radio frequency hopping signal.
The coding framing module 11, the OFDM baseband modulation module 12, the time control parameter module 14, the frequency hopping sequence generation module 15, the frequency control word module 16, the JESD204B interface control module 13, and the SPI interface control module 17 are all implemented by an FPGA. By applying the technical scheme in the anti-interference communication, the high-speed frequency hopping of 80000 hops/second within the bandwidth range of 5GHz can be realized in an FPGA (field programmable gate array) in a software radio mode through flexible digital modulation, frequency hopping sequence control and broadband radio frequency DAC (digital-to-analog converter) control. Compared with the traditional frequency hopping transmitting system, the frequency hopping method has the characteristics of wide frequency hopping band, high hopping speed, low implementation complexity, stability, reliability, high flexibility, low cost and the like.
In this embodiment, the rf DAC module is an AD9164 chip, which is a high-performance 16-bit digital-to-analog converter (DAC) and a direct digital frequency synthesizer (DDS), and supports an update rate up to 6 GSPS. The DAC core is based on an architecture incorporating a 2-fold interpolation filter, and can achieve an effective DAC update rate of up to 12GSPS in a particular mode. The internally integrated DDS consists of a set of 32 Numerically Controlled Oscillators (NCO), each with its own phase accumulator. The configuration interface supports a Serial Peripheral Interface (SPI) above 100MHz, and the frequency switching time is less than 250ns, so that the frequency hopping and hopping speed of more than 400000 hops/second can be realized, and the broadband system design of 80000 hops/second can be sufficiently supported.
The JESD204B is a new high-speed data interface standard for high-speed interconnection inside a data converter and a logic device, and can support multi-channel synchronization and serial data transmission of 12.5 Gbit/s. The AD9164 chip is provided with 8 paths of JESD204B interfaces and can support 5Gsps rate data output.
The frequency control word module 16 generates the wide-interval frequency hopping control word in the following manner: converting a frequency hopping sequence into a decimal number through linear operation of a modulus N to carry out frequency selection, and judging whether the interval between the frequency hopping point and the last frequency hopping point is larger than a preset fixed value (the preset value is selected to be larger as better as the preset value is generally larger, but is limited by the total frequency hopping bandwidth, so that the selection is generally carried out by 1/10-1/100 of the total frequency hopping bandwidth or 10-20 times of the bandwidth of a single frequency point, for example, the total bandwidth is 5GHz, the single frequency point is 5MHz, the preset value is 100MHz, and it should be noted that the 100MHz is the minimum value of the wide interval), if so, and directly selecting the frequency point as a frequency hopping frequency point control word to be output, if the frequency point is not satisfied, performing wide interval frequency hopping smooth substitution processing on a frequency hopping sequence to obtain a wide interval frequency hopping point, and outputting the wide interval frequency hopping point as a frequency hopping frequency point control word, wherein N is the total number of the frequency hopping frequency points.
The method for realizing the wide-interval frequency hopping smooth substitution comprises the following steps: defining frequency point F ═ F in frequency hopping bandiI is more than or equal to |0 and less than or equal to 999| }, the minimum interval between frequency points is 5MHz, the minimum interval between adjacent pulses is 100MHz, as long as | f is satisfiedi+1-fiIf the frequency is not less than 100MHz, the frequency is a wide interval frequency hopping point, otherwise, the frequency is a narrow interval frequency hopping point; the correction relation of the narrow interval frequency hopping point is PN (i +1) ═ PN (i) + d]modN, where N is the number of hopping bins 1000, d is the hopping interval number 20, and PN (i) is the hopping bin.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (3)

1. A broadband high-speed frequency hopping transmission system is characterized in that the frequency hopping bandwidth of the system is 5GHz, and the hopping speed is 80000 hops/sec, and the system comprises:
the time control parameter module is used for outputting time control parameters;
the coding framing module is used for processing the sent binary numerical information according to the time control parameter to form a data frame structure required by the OFDM baseband modulation module;
the OFDM baseband modulation module is used for modulating the sent data frame into an OFDM baseband signal stream;
the frequency hopping sequence generating module is used for generating a frequency hopping sequence according to the time control parameter;
the frequency control word module is used for generating wide-interval frequency control words according to the frequency hopping sequence;
the JESD204B interface control module is used for sending the OFDM baseband signal stream to the radio frequency DAC module;
the SPI interface control module is used for sending the frequency control word to the radio frequency DAC module;
the radio frequency DAC module adopts a radio frequency digital-to-analog converter AD9164 chip and is used for carrying out frequency hopping and digital-to-analog conversion on the sent OFDM baseband signal flow and the frequency control word to generate a required frequency hopping analog signal;
the filter amplifying circuit is used for filtering and amplifying the frequency hopping analog signal so as to complete the output of the intermediate frequency or radio frequency hopping signal;
the code framing module, the OFDM baseband modulation module, the time control parameter module, the frequency hopping sequence generation module, the frequency control word module, the JESD204B interface control module and the SPI interface control module are all realized through an FPGA.
2. The wideband high speed frequency hopping transmission system as claimed in claim 1, wherein:
the frequency control word module converts a frequency hopping sequence into decimal numbers through linear operation of a modulus N to carry out frequency selection, judges whether the interval between the frequency point and the last frequency hopping point is larger than a preset fixed value, if so, directly selects the frequency point as a frequency hopping point control word to be output, if not, carries out wide-interval frequency hopping smooth substitution treatment on the frequency hopping sequence to obtain a wide-interval frequency hopping point, and outputs the wide-interval frequency hopping point as a frequency hopping point control word, wherein N is the total number of the frequency hopping points.
3. The wideband high speed frequency hopping transmission system according to claim 2, wherein said wide interval frequency hopping smooth substitution is implemented by:
defining frequency point F ═ F in frequency hopping bandiI is more than or equal to |0 and less than or equal to 999}, the minimum interval between frequency points is 5MHz, the minimum interval between adjacent pulses is 100MHz, and only if | f is satisfiedi+1-fiIf the frequency is not less than 100MHz, the frequency is a wide interval frequency hopping point, otherwise, the frequency is a narrow interval frequency hopping point; the correction relation of the narrow interval frequency hopping point is PN (i +1) ═ PN (i) + d]mod N, where N is the number of hopping bins 1000, d is the hopping interval number 20, and PN (i) is the hopping bin.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102651655A (en) * 2011-02-24 2012-08-29 北京化工大学 Realization method of fast frequency hopping communication
CN103178870A (en) * 2011-12-21 2013-06-26 北京普源精电科技有限公司 Frequency hopping signal generator and frequency hopping method
CN104426557A (en) * 2013-08-27 2015-03-18 许亚夫 High-speed frequency hopping transmitter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102651655A (en) * 2011-02-24 2012-08-29 北京化工大学 Realization method of fast frequency hopping communication
CN103178870A (en) * 2011-12-21 2013-06-26 北京普源精电科技有限公司 Frequency hopping signal generator and frequency hopping method
CN104426557A (en) * 2013-08-27 2015-03-18 许亚夫 High-speed frequency hopping transmitter

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