CN104301072B - Narrow band data transmission-based machine-to-machine communication method and system - Google Patents

Narrow band data transmission-based machine-to-machine communication method and system Download PDF

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CN104301072B
CN104301072B CN201410621247.5A CN201410621247A CN104301072B CN 104301072 B CN104301072 B CN 104301072B CN 201410621247 A CN201410621247 A CN 201410621247A CN 104301072 B CN104301072 B CN 104301072B
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signal
module
carrier
symbol
machine
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CN104301072A (en
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屈代明
何辉
汪志冰
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Shanghai Road Bio Technology Co., Ltd
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Wuhan Tuo Bao Science And Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

The invention relates to a narrow band data transmission-based machine-to-machine communication method and system. The method comprises a signal transmission process and a signal reception process, wherein the signal transmission process comprises the following steps: firstly enabling each carrier wave to pass through a channel encoding module, carrying out amplitude modulation on the carrier waves, transferring the carrier waves to a multi-carrier wave modulation module to form discrete digital baseband signals, enabling the discrete digital baseband signals to pass through a digital-to-analogue conversion module to become analogue signals, and finally conducting up-conversion on the analogue signals to a pointed frequency for transmission; the signal reception process comprises the following steps: conducting down-conversion on the received signals to baseband signals, filtering the baseband signals through a low-pass filter, converting the signals output by the low-pass filter to discrete digital signals through an analogue-to-digital conversion module, extracting signals on a pointed carrier wave by using a matching reception module, carrying out amplitude demodulation on the output of the matching reception module, and carrying out channel decoding on the amplitude demodulated signals to obtain data output. According to the narrow band data transmission-based machine-to-machine communication method and system, the narrow band communication signals sent to different machine terminals can be mutually overlapped on a frequency spectrum without specially isolating the frequency bands, so that the frequency spectrum utilization rate is effectively improved.

Description

Machine-to-machine communication method and system based on narrow band data transmission
Technical field
The present invention relates to machine-to-machine communication, in particular to a kind of machine-to-machine communication based on narrow band data transmission Method and system.
Background technology
At present, in Machine To Machine (M2M) communication using narrow band data transmission, base station is needed to multiple machine terminals Transmission narrow band communication signal, mutually isolated on frequency spectrum, i.e., traditional frequency division multiplexing (FDM) technology of these signals of communication, in order to Ensure that these signals of communication are mutually isolated on frequency spectrum, it usually needs the isolation of suitable width is set between signal of communication frequently Band, so as to cause spectrum efficiency relatively low.The art of this patent scheme causes that the narrow band communication signal for being sent to different machines terminal can With overlapped on frequency spectrum, it is not necessary to special isolation frequency band, spectrum efficiency is effectively increased.
The content of the invention
Present invention aim to overcome that above-mentioned the deficiencies in the prior art and provide it is a kind of based on narrow band data transmission machine To machine communication method and system, the method enables to be sent to the narrow band communication signal of the different machines terminal phase on frequency spectrum Mutually overlap, without special isolation frequency band, effectively increase spectrum efficiency.
Realizing the technical scheme that the object of the invention is used is：A kind of machine-to-machine communication side based on narrow band data transmission Method, the method includes that signal emission process and signal receive process,
The signal emission process includes：For each carrier wave, its input data first passes through channel coding module, then passes through Amplitude modulation(PAM) module carries out amplitude modulation(PAM), formed after the real number symbol after amplitude modulation(PAM) is sent to multi-carrier modulation module from Data signal is dissipated, the output of multi-carrier modulation module is by turning into analog signal, the mould after digital-to-analogue conversion after D/A converter module Intend signal by after up-conversion and transmitter module, being launched after upconverting to assigned frequency；
The signal receives process to be included：Signal will be received and be down-converted to baseband signal, baseband signal is low by one Bandpass filter filters non-conterminous carrier signal, while suppressing adjacent carrier signal, low-pass filter output signal is passed through Analog-to-digital conversion module obtains discrete digital signal, and the signal on designated carrier is extracted using matching receiver module, and matching is received The output of module carries out amplitude demodulation, and the signal after amplitude demodulation obtains data output by channel decoding.
In the above-mentioned technical solutions, shape after the real number symbol by after amplitude modulation(PAM) is sent to multi-carrier modulation module Include following operation into discrete digital signal：
Two adjacent real number symbols of same carrier wave, after being interlocked by real void, are formed real number and imaginary number alternately go out Existing symbol, meanwhile, same symbol also forms the symbol that real number and imaginary number are alternately present between adjacent carrier；
Sample rate is improved M/2 times by up-sampling module, and the present embodiment is inserted between using each two input sample point The method of M/2-1 zero, real number symbol period is referred to as by M/2, and M is referred to as into the complex symbol cycle；
It is carrier modulation after filter filtering by wave filter after up-sampling, has M carrier wave；
Finally the signal of all carrier waves is added, following output signal s [k] is obtained,
In formula, dm,nN-th incoming symbol of real number signal on m-th carrier wave is represented, g (k) is Disgrete Time Domain filtering Device, Z represents the set that all integers are constituted.
In the above-mentioned technical solutions, M carrier wave is launched in base station simultaneously, if base station does not use certain carrier wave, it is only necessary to letter The incoming symbol of the carrier wave is set as 0 by single ground.
In the above-mentioned technical solutions, the signal using on matching receiver module extraction designated carrier includes：Signal is defeated Enter and first pass around filter filtering, followed by down-sampling, a point is obtained per M/2 point sampling, it is followed by real void and interlocks, finally Real part is taken to be exported.
Additionally, the present invention also provides a kind of machine-to-machine communication system based on narrow band data transmission, the system includes Transmitter and receiver, the emitter includes the channel coding module, amplitude modulation(PAM) module, the multi-carrier modulation mould that are sequentially connected Block, D/A converter module and up-conversion and transmitter module, wherein, multi-carrier modulation module includes actual situation interleaved units, up-sampling Unit, filter unit and carrier modulation unit；The receiver includes the reception and down conversion module, the LPF that are sequentially connected Device, analog-to-digital conversion module, matching receiver module, amplitude demodulation module and channel decoding module, wherein, matching receiver module includes Filter unit, downsampling unit, actual situation interleaved units and take real part unit.
Frequency interval between carrier wave of the present invention is 1/M, and complex symbol interval is M on each carrier wave, i.e. complex symbol speed Rate is 1/M, i.e., be 1/M with the character rate of the bandwidth for transmission of 1/M, theoretical according to Nyquist Bandwidth, has reached highest frequently Spectrum utilization ratio.
Technical solution of the present invention allows to be sent to narrow band communication signal phase mutual respect on frequency spectrum of different machines terminal It is folded, it is not necessary to special isolation frequency band, effectively increase spectrum utilization efficiency.
Brief description of the drawings
Fig. 1 is the structured flowchart of emitter in machine-to-machine communication system of the present invention based on narrow band data transmission.
Fig. 2 is the structured flowchart of receiver in machine-to-machine communication system of the present invention based on narrow band data transmission.
Fig. 3 is multi-carrier modulation process signal in machine-to-machine communication method of the present invention based on narrow band data transmission Figure.
Fig. 4 is matching reception process schematic in machine-to-machine communication method of the present invention based on narrow band data transmission.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, machine-to-machine communication system of the present invention based on narrow band data transmission includes emitter and reception Machine, the structure of emitter are as shown in figure 1, including being sequentially connected：Channel coding module, amplitude modulation(PAM) module, multi-carrier modulation Module, D/A converter module and up-conversion and transmitter module, wherein, multi-carrier modulation module include actual situation interleaved units, on adopt Sample unit, filter unit and carrier modulation unit.The structure of receiver is as shown in Fig. 2 including being sequentially connected：Receive and lower change Frequency module, low pass filter, analog-to-digital conversion module, matching receiver module, amplitude demodulation module and channel decoding module, wherein, Matching receiver module includes filter unit, downsampling unit, actual situation interleaved units and takes real part unit.
It is above-mentioned based on narrow band data transmission machine-to-machine communication system realize communication process include signal transmitting and Signal is received, and wherein signal emission process is as follows：
S100, for each carrier wave, its input data first passes through channel coding module, and the antinoise for improving signal is anti-interference Ability；
S200, again by amplitude modulation(PAM) module, the amplitude modulation(PAM) such as pulse amplitude modulation PAM etc. for commonly using at present.
S300, after the real number symbol after amplitude modulation(PAM) is sent to multi-carrier modulation module discrete digital signal is formed, As shown in figure 3, including following operation：
If M carrier wave is launched in base station simultaneously, the nth symbol of m-th carrier wave is designated as dm,nIf base station does not use certain Carrier wave, it is only necessary to the incoming symbol of the carrier wave is simply set as 0.
In the present invention, two adjacent real number symbols of same carrier wave, after being interlocked by real void, one is real number, Next is imaginary number, so circulation, forms the symbol that real number and imaginary number are alternately present, therefore the two adjacent real number symbols Can be regarded as a complex symbol.Meanwhile, same symbol also forms the symbol that real number and imaginary number are alternately present between adjacent carrier Number, such as nth symbol, if being real number on m-th carrier wave, on that the m+1 carrier wave should be imaginary number.
Sample rate is improved M/2 times by up-sampling module, and the present embodiment is inserted between using each two input sample point The method of M/2-1 zero, real number symbol period is referred to as by M/2, and M is referred to as into the complex symbol cycle.
It is carrier modulation after filter filtering by wave filter after up-sampling, has M carrier wave, the frequency of each carrier wave Rate is different, and carrier frequency is as shown in mark in Fig. 2.
Finally the signal of all carrier waves is added, following output signal s [k] is obtained,
In formula, dm,nN-th incoming symbol of real number signal on m-th carrier wave is represented, g (k) is Disgrete Time Domain filtering Device, Z represents the set that all integers are constituted.
S400, the output of multi-carrier modulation module are by turning into analog signal after D/A converter module
Analog signal after S500, digital-to-analogue conversion is by after up-conversion and transmitter module, upconverting to assigned frequency laggard Row transmitting.
Signal receiver only receives the data on certain carrier wave, and other subcarrier datas are not received, and detailed process is as follows：
S100, receiving terminal will receive signal down coversion, and the carrier signal of specified reception is converted into baseband signal.
S200, baseband signal is filtered into non-conterminous carrier signal by a low pass filter, while suppressing adjacent Carrier signal.
S300, by low-pass filter output signal by analog-to-digital conversion module, obtain discrete digital signal,
S400, using matching receiver module extract designated carrier on signal, detailed process as shown in figure 4, including：Signal Input first passes around filter filtering, followed by down-sampling, and a point is obtained per M/2 point sampling, is followed by real void and interlocks, most After take real part and exported.
S500, the output to matching receiver module carry out amplitude demodulation.
Signal after S600, amplitude demodulation obtains data output by channel decoding.

Claims (4)

1. a kind of machine-to-machine communication method based on narrow band data transmission, it is characterised in that including signal emission process and Signal receives process,
The signal emission process includes：For each carrier wave, its input data first passes through channel coding module, then by amplitude Modulation module carries out amplitude modulation(PAM), and dispersion number is formed after the real number symbol after amplitude modulation(PAM) is sent to multi-carrier modulation module Word signal, by turning into analog signal after D/A converter module, the simulation after digital-to-analogue conversion is believed for the output of multi-carrier modulation module Number by after up-conversion and transmitter module, being launched after upconverting to assigned frequency；
The real number symbol by after amplitude modulation(PAM) forms discrete digital signal after being sent to multi-carrier modulation module to be included such as Lower operation：
Two adjacent real number symbols of same carrier wave, by it is real empty staggeredly after, form real number and imaginary number be alternately present Symbol, meanwhile, same symbol also forms the symbol that real number and imaginary number are alternately present between adjacent carrier；
Sample rate is improved M/2 times by up-sampling module, uses the side of insertion M/2-1 zero between each two input sample point Method, real number symbol period is referred to as by M/2, and M is referred to as into the complex symbol cycle；
It is carrier modulation after filter filtering by wave filter after up-sampling, has M carrier wave；
Finally the signal of all carrier waves is added, following output signal s [k] is obtained,
s [ k ] = Σ m = 0 M - 1 Σ n ∈ Z d m , n g ( k - n M 2 ) e j 2 π m k / M e j ( m + n ) π / 2
In formula, dm,nN-th incoming symbol of real number signal on m-th carrier wave is represented, g (k) is Disgrete Time Domain wave filter, Z tables Show the set that all integers are constituted；
The signal receives process to be included：Signal will be received and be down-converted to baseband signal, baseband signal is passed through into a low pass filtered Ripple device filters non-conterminous carrier signal, while suppressing adjacent carrier signal, low-pass filter output signal is passed through into modulus Modular converter obtains discrete digital signal, and the signal on designated carrier is extracted using matching receiver module, to matching receiver module Output carry out amplitude demodulation, the signal after amplitude demodulation by channel decoding obtain data output.
2. the machine-to-machine communication method transmitted based on narrow band data according to claim 1, it is characterised in that：Base station is same When launch M carrier wave, if base station does not use certain carrier wave, it is only necessary to the incoming symbol of the carrier wave simply is set as into 0.
3. the machine-to-machine communication method transmitted based on narrow band data according to claim 1, it is characterised in that described to make Extracting the signal on designated carrier with matching receiver module includes：Signal input first passes around filter filtering, followed by under adopt Sample, a point is obtained per M/2 point sampling, is followed by real void and is interlocked, and is finally taken real part and is exported.
4. it is a kind of based on narrow band data transmission machine-to-machine communication system, it is characterised in that：Including transmitter and receiver, The emitter includes the channel coding module, amplitude modulation(PAM) module, multi-carrier modulation module, the D/A converter module that are sequentially connected With up-conversion and transmitter module, wherein, multi-carrier modulation module include actual situation interleaved units, up-sampling unit, filter unit and Carrier modulation unit；The receiver includes the reception and down conversion module, low pass filter, the analog-to-digital conversion mould that are sequentially connected Block, matching receiver module, amplitude demodulation module and channel decoding module, wherein, matching receiver module include filter unit, under adopt Sample unit, actual situation interleaved units and take real part unit；Wherein,
The multi-carrier modulation module is used to that discrete digital signal will to be formed by the real number symbol after amplitude modulation(PAM), including such as Lower operation：
Two adjacent real number symbols of same carrier wave, by it is real empty staggeredly after, form real number and imaginary number be alternately present Symbol, meanwhile, same symbol also forms the symbol that real number and imaginary number are alternately present between adjacent carrier；
Sample rate is improved M/2 times by up-sampling module, and the present embodiment inserts M/2-1 between using each two input sample point Individual zero method, real number symbol period is referred to as by M/2, and M is referred to as into the complex symbol cycle；
It is carrier modulation after filter filtering by wave filter after up-sampling, has M carrier wave；
Finally the signal of all carrier waves is added, following output signal s [k] is obtained,
s [ k ] = Σ m = 0 M - 1 Σ n ∈ Z d m , n g ( k - n M 2 ) e j 2 π m k / M e j ( m + n ) π / 2
In formula, dm,nN-th incoming symbol of real number signal on m-th carrier wave is represented, g (k) is Disgrete Time Domain wave filter, Z tables Show the set that all integers are constituted.
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CN1217111A (en) * 1996-02-29 1999-05-19 艾利森公司 Multiple access communications system and method using code and time division
CN1841953A (en) * 1998-08-18 2006-10-04 比阿恩凤凰公司 Multilayer carrier discrete multitone communication technology
CN101771656A (en) * 2001-06-22 2010-07-07 汤姆森许可公司 Method and system for compensating carrier frequency offset in OFDM receiver
CN101841349A (en) * 2010-04-12 2010-09-22 北京理工大学 Method for inhibiting MPSK narrowband interference of direct sequence spread spectrum system (DSSS)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1217111A (en) * 1996-02-29 1999-05-19 艾利森公司 Multiple access communications system and method using code and time division
JP2000505629A (en) * 1996-02-29 2000-05-09 エリクソン インコーポレイテッド Multiple access communication system and method using code and time division
CN1841953A (en) * 1998-08-18 2006-10-04 比阿恩凤凰公司 Multilayer carrier discrete multitone communication technology
CN101771656A (en) * 2001-06-22 2010-07-07 汤姆森许可公司 Method and system for compensating carrier frequency offset in OFDM receiver
CN101841349A (en) * 2010-04-12 2010-09-22 北京理工大学 Method for inhibiting MPSK narrowband interference of direct sequence spread spectrum system (DSSS)

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