CN104158772B - Carrier frequency synchronization method for wireless communication network - Google Patents
Carrier frequency synchronization method for wireless communication network Download PDFInfo
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- CN104158772B CN104158772B CN201410399956.3A CN201410399956A CN104158772B CN 104158772 B CN104158772 B CN 104158772B CN 201410399956 A CN201410399956 A CN 201410399956A CN 104158772 B CN104158772 B CN 104158772B
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Abstract
The invention provides a carrier frequency synchronization method for a wireless communication network. In a multi-device network, each device estimates the frequency offset of a signal transmitted by the adjacent device, carries out calculation to obtain the amount of frequency adjustment, and corrects the frequency according to the amount of frequency adjustment. By adopting the method, consistency between the carrier frequencies of all devices in a wireless networking environment is achieved.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to the method for the carrier frequency synchronization of cordless communication network.
Background technology
The features such as wireless networking is by its non-stop layer, self-organizing, distributed, multi-hop forwarding and quickly networking extensively should
For multiple fields such as family, office, medical treatment, industry, shop, military affairs, but in many device networks, can there is multiple equipment same
Shi Xiangyi equipment sends wireless signal, and receiving device must be simultaneously by the information demodulation process of multiple equipment, because each sets
The standby carrier frequency difference for causing distinct device to send using respective crystal oscillator, so same equipment receives the carrier wave of multiple frequencies
Easily cause the deterioration of the receiving device performance, or even cannot demodulate.Solving the method for the compensation of many equipment frequency deviations at present has perhaps
It is many, such as linear equalization method, statistics class method, self-interference cancellation technology etc., generally high with computation complexity, real-time is not
By force, the not high deficiency of the availability of frequency spectrum.
The content of the invention
The technical problem to be solved in the present invention, is a kind of carrier frequency synchronization method for providing cordless communication network, real
Whole network equipment carrier frequency reaches unanimity in the environment of existing wireless networking.
What the present invention was realized in：A kind of carrier frequency synchronization method of cordless communication network, methods described is to be based on
What the wireless networking of multiple devices was realized, the equipment is Wireless Telecom Equipment, and the wireless networking includes baseband modulation and demodulation
Device, MAC layer module, frequency adjustment computing module, frequency deviation adjusting module and radio-frequency module；
The baseband modem is used to complete the mutual conversion of binary data and air transmission signal, in demodulation letter
Number while, output docking collect mail number offset estimation；
The MAC layer module is responsible for the functions such as channel access control, the discovery of neighbouring device of equipment；
The frequency adjustment computing module is counted by recording the device number and corresponding offset estimation value of sending signal
Calculate the frequency adjustment of equipment itself；
The frequency deviation adjusting module is responsible for sending and receiving frequency come corrective itself according to frequency adjustment, the frequency
Partially adjusting module includes a Up/Down Conversion device；
The radio-frequency module is used to receive and sending signal；
The present invention specifically includes following steps：
Step 1, every equipment send packet at the exclusive moment；
Step 2, every equipment monitor the signal that neighbouring device sends, and by MAC layer module the node of neighbouring device is found
Number, and by baseband modem the frequency deviation value of equipment is estimated using frequency excursion algorithm, equipment is obtained with respect to its phase
The offset estimation value of adjacent equipment simultaneously exports the offset estimation value to frequency adjustment computing module；
Step 3, frequency adjustment computing module are calculated according to the node number of neighbouring device and the offset estimation value of equipment
The frequency adjustment of equipment；
Step 4, frequency deviation adjusting module are repaiied according to the frequency adjustment of equipment in step 3 to the carrier frequency of equipment
Just, the carrier frequency is sent by radio-frequency module；
Step 5, jump to step 2.
Further, if every equipment in the step 1 at the exclusive moment without transmissible packet, send empty number
According to bag.
Further, the appraising frequency bias method in the step 2 includes the maximal possibility estimation class based on known transmission sequence
Method, the frequency deviation estimating method based on signal repeated characteristic or the carrier recovering method using phase-locked loop, frequency deviation estimating method
Selection should be chosen according to the feature of signal system.
Further, the computational methods of the frequency adjustment of the equipment are as follows：
If fiN () is the carrier frequency value that equipment i sends or receive at the n-th moment, by step 2 calculated moment
The offset estimation value of neighbouring device k and equipment i, i.e. the frequency-splitting Δ f of equipment k and equipment iik(n)=fk(n)-fi(n), then
Frequency adjustment εi(n)=Θ (Δ fik(n)), Θ is certain functional transformation；
Further, the Θ is linear weighting function, and the frequency adjustment for obtaining isIts
In, k is the neighbouring device of i, ωkIt is corresponding weight coefficient.
Further, it is described be modified rear equipment carrier frequency value be：fi(n+1)=fi(n)+εi(n)。
Further, repairing in the step 4 be exactly based on adjustment local oscillator frequency come control simulation become up and down
The conversion frequencies of frequency device adjust conversion frequencies using the method for Digital Signal Processing.
Further, the described method using Digital Signal Processing come adjust conversion frequencies this amendment can this
The frequency of ground agitator is realized in the case of fixing, is implemented as：Frequency adjustment is inputed to into Direct Digital frequency to close
Grow up to be a useful person DDS, with the multiple sinusoidal signal of the two-way for producing a frequency, then the multiple sinusoidal signal of the two-way of acquisition is multiplied by respectively into base band input
With the baseband signal of intermediate frequency input, the baseband signal after frequency of amendment is obtained.
The invention has the advantages that：The offset estimation that the present invention is adjacent equipment room by equipment calculates the frequency of itself
Rate adjustment amount carrys out the frequency of adjusting device, so as to the frequency for realizing each equipment is mutually in step, meanwhile, amount of calculation of the present invention is little,
Simple structure, it is easy to Project Realization.
Description of the drawings
With reference to the accompanying drawings in conjunction with the embodiments the present invention is further illustrated.
Fig. 1 is fundamental diagram of the present invention.
Fig. 2 is the inventive method execution flow chart.
Fig. 3 is the workflow diagram of frequency deviation adjusting module of the present invention.
Specific embodiment
As depicted in figs. 1 and 2, a kind of carrier frequency synchronization method of cordless communication network, the method is set based on multiple stage
What standby wireless networking was realized, the equipment is Wireless Telecom Equipment, and the wireless networking includes baseband modem, MAC
Layer module, frequency adjustment computing module, frequency deviation adjusting module and radio-frequency module；
The baseband modem is used to complete the mutual conversion of binary data and air transmission signal, in demodulation letter
Number while, output docking collect mail number offset estimation；
The MAC layer module is responsible for the functions such as channel access control, the discovery of neighbouring device of equipment；
The frequency adjustment computing module is counted by recording the device number and corresponding offset estimation value of sending signal
Calculate the frequency adjustment of equipment itself；
The frequency deviation adjusting module is responsible for sending and receiving frequency come corrective itself according to frequency adjustment, the frequency
Partially adjusting module includes a Up/Down Conversion device；
The radio-frequency module is used to receive and sending signal；
The present invention specifically includes following steps：
Step 1, every equipment send packet at the exclusive moment, if without transmissible packet, sending empty packet,
It is assumed here that the Networking protocol of equipment allows each equipment exclusively to send packet in certain timeslice, this hypothesis
Typically reasonable and common, the exclusivity that packet sends guarantees that neighbouring device can adopt traditional frequency excursion algorithm,
So that the inventive method embodies larger advantage；
Step 2, every equipment monitor the signal that neighbouring device sends, and by MAC layer module the node of neighbouring device is found
Number, and by baseband modem the frequency deviation value of equipment is estimated using traditional frequency excursion algorithm, obtain equipment phase
Offset estimation value to its neighbouring device simultaneously exports the offset estimation value to frequency adjustment computing module, traditional frequency deviation
Estimation algorithm includes maximal possibility estimation class method, the frequency deviation estimating method based on signal repeated characteristic based on known transmission sequence
Or using the carrier recovering method of phase-locked loop；
Step 3, frequency adjustment computing module are calculated according to the node number of neighbouring device and the offset estimation value of equipment
The frequency adjustment of equipment, the computational methods of the frequency adjustment of the equipment are as follows：
If fiN () is the carrier frequency value that equipment i sends or receive at the n-th moment, by step 2 calculated moment
The offset estimation value of neighbouring device k and equipment i, i.e. the frequency-splitting Δ f of equipment k and equipment iik(n)=fk(n)-fi(n), then
Frequency adjustment εi(n)=Θ (Δ fik(n)), Θ is certain functional transformation, and a kind of fairly simple and effective method is to take
Θ is linear weighting function, then frequency adjustmentWherein k is the neighbouring device of i, ωkIt is corresponding
Weight coefficient；
Step 4, frequency deviation adjusting module are repaiied according to the frequency adjustment of equipment in step 3 to the carrier frequency of equipment
Just, this is repaiied and is exactly based on the frequency for adjusting local oscillator to control to simulate the conversion frequencies of Up/Down Conversion device or using numeral letter
Adjusting conversion frequencies, the carrier frequency value of equipment is after amendment for number method for processing：fi(n+1)=fi(n)+εi(n), the load
Wave frequency is sent by radio-frequency module；
As shown in Figures 2 and 3, the amendment employed in the present embodiment is that change is adjusted using the method for Digital Signal Processing
Frequent rate, the realization of this amendment is based on a hypothesis：The carrier frequency of equipment receiving and transmitting signal is identical, and equipment is upper and lower
The frequency values of frequency conversion are strict conformances.This hypothesis is easily met in systems in practice, because in radio-frequency module, on
The local oscillator of lower frequency changer circuit typically adopts same clock source.The idiographic flow of frequency deviation adjusting module is：First, frequency is adjusted
Amount inputs to Direct Digital Synthesizer DDS, with the multiple sinusoidal signal of the two-way for producing a frequency, then the two-way of acquisition is answered
Sinusoidal signal is multiplied by respectively the baseband signal of base band input and intermediate frequency input, obtains the baseband signal after frequency of amendment.
In addition, the frequency adjustment computing module can with processor software or by specialized hardware calculate electricity
Road is constituted, and the input of the frequency adjustment computing module is the offset estimation value of neighbouring device, is output as the frequency of equipment itself
Adjustment amount.
Although the foregoing describing the specific embodiment of the present invention, those familiar with the art should manage
Solution, the specific embodiment described by us is merely exemplary, rather than for the restriction to the scope of the present invention, is familiar with this
The technical staff in field should be covered the present invention's in the equivalent modification and change made according to the spirit of the present invention
In scope of the claimed protection.
Claims (8)
1. a kind of carrier frequency synchronization method of cordless communication network, it is characterised in that：Methods described is based on multiple devices
What wireless networking was realized, the equipment is Wireless Telecom Equipment, and the wireless networking includes baseband modem, MAC layer mould
Block, frequency adjustment computing module, frequency deviation adjusting module and radio-frequency module；
The baseband modem is used to complete the mutual conversion of binary data and air transmission signal, in demodulated signal
Meanwhile, the offset estimation of the output docking collection of letters number；
The MAC layer module is responsible for the discovery of the node of the channel access control and neighbouring device of equipment；
The frequency adjustment computing module is calculated by recording the device number and corresponding offset estimation value of sending signal
The frequency adjustment of equipment itself；
The frequency deviation adjusting module is responsible for sending and receiving frequency come corrective itself according to frequency adjustment, and the frequency deviation is adjusted
Mould preparation block includes a Up/Down Conversion device；
The radio-frequency module is used to receive and sending signal；
Methods described comprises the steps：
Step 1, every equipment send packet at the exclusive moment；
Step 2, every equipment monitor the signal that neighbouring device sends, and by MAC layer module the node number of neighbouring device is found, and
By baseband modem the frequency deviation value of equipment is estimated using frequency excursion algorithm, obtain equipment with respect to its neighbouring device
Offset estimation value and export the offset estimation value to frequency adjustment computing module；
Step 3, frequency adjustment computing module calculate equipment according to the node number of neighbouring device and the offset estimation value of equipment
Frequency adjustment；
Step 4, frequency deviation adjusting module are modified according to the frequency adjustment of equipment in step 3 to the carrier frequency of equipment, should
Carrier frequency is sent by radio-frequency module；
Step 5, jump to step 2.
2. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, it is characterised in that：The step
If every equipment in rapid 1, without transmissible packet, sends empty packet at the exclusive moment.
3. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, it is characterised in that：The step
Appraising frequency bias method in rapid 2 is included based on the maximal possibility estimation class method of known transmission sequence, based on signal repeated characteristic
Frequency deviation estimating method or the carrier recovering method using phase-locked loop.
4. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, it is characterised in that：
The computational methods of the frequency adjustment of the equipment are as follows：
If fiN () is the carrier frequency value that equipment i sends or receive at the n-th moment, adjacent by step 2 calculated moment
The offset estimation value of equipment k and equipment i, i.e. the frequency-splitting Δ f of equipment k and equipment iik(n)=fk(n)-fi(n), then frequency
Adjustment amount εi(n)=Θ (Δ fik(n)), Θ is certain functional transformation.
5. the carrier frequency synchronization method of a kind of cordless communication network according to claim 4, it is characterised in that：The Θ
For linear weighting function, the frequency adjustment for obtaining isWherein, k is the neighbouring device of i, ωkIt is phase
The weight coefficient answered.
6. the carrier frequency synchronization method of a kind of cordless communication network according to claim 4, it is characterised in that：It is described enter
The carrier frequency value of equipment is after row amendment：fi(n+1)=fi(n)+εi(n)。
7. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, it is characterised in that：The step
Repairing in rapid 4 be exactly based on adjustment local oscillator frequency come control simulate Up/Down Conversion device conversion frequencies or using numeral
The method of signal processing is adjusting conversion frequencies.
8. the carrier frequency synchronization method of a kind of cordless communication network according to claim 7, it is characterised in that：Described
This amendment that conversion frequencies are adjusted using the method for Digital Signal Processing is specially：Frequency adjustment is inputed to into direct number
Word formula frequency synthesizer DDS, with the multiple sinusoidal signal of the two-way for producing a frequency, then the multiple sinusoidal signal of the two-way of acquisition is taken advantage of respectively
With base band input and the baseband signal of intermediate frequency input, the baseband signal after frequency of amendment is obtained.
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| CN201410399956.3A CN104158772B (en) | 2014-06-27 | 2014-08-13 | Carrier frequency synchronization method for wireless communication network |
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| CN201410399956.3A CN104158772B (en) | 2014-06-27 | 2014-08-13 | Carrier frequency synchronization method for wireless communication network |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150819A (en) * | 2007-11-12 | 2008-03-26 | 北京天碁科技有限公司 | An automatic multi-mode mobile communication terminal and its automatic frequency control method |
| CN102098250A (en) * | 2011-01-26 | 2011-06-15 | 意法·爱立信半导体（北京）有限公司 | Frequency offset processing method and device for multi-mode terminal |
| US8228826B2 (en) * | 2009-11-30 | 2012-07-24 | Motorola Solutions, Inc. | Method and system for call setup in an asynchronous frequency hopping digital two-way communication system |
| WO2013075340A1 (en) * | 2011-11-25 | 2013-05-30 | Renesas Mobile Corporation | Radio resource sharing and contention scheme for device-to-device communication in white space spectrum bands |
| CN103581072A (en) * | 2013-11-25 | 2014-02-12 | 大唐移动通信设备有限公司 | Frequency offset estimation method and device for multi-carrier system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070105558A (en) * | 2006-04-26 | 2007-10-31 | 삼성전자주식회사 | Method and apparatus for enhancing the detection of common control channel in orthogonal frequency division mutiplexing access based cellular communication system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150819A (en) * | 2007-11-12 | 2008-03-26 | 北京天碁科技有限公司 | An automatic multi-mode mobile communication terminal and its automatic frequency control method |
| US8228826B2 (en) * | 2009-11-30 | 2012-07-24 | Motorola Solutions, Inc. | Method and system for call setup in an asynchronous frequency hopping digital two-way communication system |
| CN102098250A (en) * | 2011-01-26 | 2011-06-15 | 意法·爱立信半导体（北京）有限公司 | Frequency offset processing method and device for multi-mode terminal |
| WO2013075340A1 (en) * | 2011-11-25 | 2013-05-30 | Renesas Mobile Corporation | Radio resource sharing and contention scheme for device-to-device communication in white space spectrum bands |
| CN103581072A (en) * | 2013-11-25 | 2014-02-12 | 大唐移动通信设备有限公司 | Frequency offset estimation method and device for multi-carrier system |
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