CN104158772A - Carrier frequency synchronization method for wireless communication network - Google Patents
Carrier frequency synchronization method for wireless communication network Download PDFInfo
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- CN104158772A CN104158772A CN201410399956.3A CN201410399956A CN104158772A CN 104158772 A CN104158772 A CN 104158772A CN 201410399956 A CN201410399956 A CN 201410399956A CN 104158772 A CN104158772 A CN 104158772A
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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, relate in particular to the method for the carrier frequency synchronization of cordless communication network.
Background technology
Wireless networking relies on Qi Wu center, self-organizing, distributed, the features such as multi-hop forwarding and quickly networking are widely used in family, office, medical treatment, industry, shop, multiple fields such as military affairs, but in many device networks, can exist multiple equipment to send wireless signal to an equipment simultaneously, receiving equipment must be simultaneously by the demodulates information processing of multiple equipment, the carrier frequency difference that uses crystal oscillator separately to cause distinct device to send due to each equipment, the carrier wave that same like this equipment receives multiple frequencies easily causes the deterioration of this receiving equipment performance, even cannot demodulation.The method of the current compensation that solves many equipment frequency deviation has many, such as linear equalization method, statistics class methods, self-interference cancellation technology etc., generally has computation complexity high, and real-time is not strong, the not high deficiency of the availability of frequency spectrum.
Summary of the invention
The technical problem to be solved in the present invention, is to provide a kind of carrier frequency synchronization method of cordless communication network, realizes whole network equipment carrier frequency in the environment of wireless networking and reaches unanimity.
The present invention is achieved in that a kind of carrier frequency synchronization method of cordless communication network, described method is that the wireless networking based on multiple devices is realized, described equipment is Wireless Telecom Equipment, and described wireless networking comprises baseband modem, MAC layer module, frequency adjustment amount computing module, frequency deviation adjusting module and radio-frequency module;
Described baseband modem has been used for binary data and the mutual conversion of signal transmission in the air, and in restituted signal, output frequency deviation is to received signal estimated;
Described MAC layer module is responsible for the function such as channel access control, the discovery of neighbouring device of equipment;
Described frequency adjustment amount computing module calculates the frequency adjustment amount of equipment self by recording the device number of transmitted signal and corresponding frequency deviation estimated value;
Described frequency deviation adjusting module is responsible for coming according to frequency adjustment amount the sending and receiving frequency of corrective self, and this frequency deviation adjusting module comprises a Up/Down Conversion device;
Described radio-frequency module is for receiving and transmitted signal;
The present invention specifically comprises the steps:
Step 1, every equipment are being monopolized moment transmission packet;
Step 2, every equipment are monitored the signal that neighbouring device sends, find the node number of neighbouring device by MAC layer module, and adopt frequency deviation algorithm for estimating to estimate the frequency deviation value of equipment by baseband modem, obtain the frequency deviation estimated value of relative its neighbouring device of equipment and export this frequency deviation estimated value to frequency adjustment amount computing module;
Step 3, frequency adjustment amount computing module calculate the frequency adjustment amount of equipment according to the frequency deviation estimated value of the node number of neighbouring device and equipment;
Step 4, frequency deviation adjusting module are revised the carrier frequency of equipment according to the frequency adjustment amount of equipment in step 3, and this carrier frequency is sent by radio-frequency module;
Step 5, jump to step 2.
Further, if every equipment in described step 1 is monopolizing the packet that the moment can not send, send empty packet.
Further, appraising frequency bias method in described step 2 comprises the maximal possibility estimation class methods based on known transmission sequence, the frequency deviation estimating method based on signal repeated characteristic or utilizes the carrier recovering method of phase-locked loop, and the selection of frequency deviation estimating method should be chosen according to the feature of signal system.
Further, the computational methods of the frequency adjustment amount of described equipment are as follows:
If f
i(n) be equipment i in the carrier frequency value that the n moment sends or receives, this moment neighbouring device k being calculated by step 2 and the frequency deviation estimated value of equipment i, i.e. the frequency-splitting Δ f of equipment k and equipment i
ik(n)=f
k(n)-f
i(n), frequency adjustment amount ε
i(n)=Θ (Δ f
ik(n)), Θ is certain functional transformation;
Further, described Θ is linear weighted function function, and the frequency adjustment amount obtaining is
wherein, k is the neighbouring device of i, ω
kit is corresponding weights coefficient.
Further, the carrier frequency value of revising rear equipment described in is: f
i(n+1)=f
i(n)+ε
i(n).
Further, the correction in described step 4 is to be carried out the frequency conversion frequency of control simulation Up/Down Conversion device or utilized the method for Digital Signal Processing to adjust frequency conversion frequency by the frequency of adjustment local oscillator.
Further, this correction that the described method of utilizing Digital Signal Processing is adjusted frequency conversion frequency can realize in the case of the frequency of local oscillator is fixing, specific implementation is: frequency adjustment amount is inputed to Direct Digital Synthesizer DDS, to produce the multiple sinusoidal signal of two-way of a frequency, again multiple the two-way of acquisition sinusoidal signal is multiplied by respectively to the baseband signal of base band input and intermediate frequency input, obtains the baseband signal after frequency of amendment.
Tool of the present invention has the following advantages: the frequency deviation that the present invention is adjacent equipment room by equipment estimates to calculate self frequency adjustment amount and adjust the frequency of equipment, thereby realize the frequency phase mutually synchronization of each equipment, meanwhile, amount of calculation of the present invention little, simple in structure, be easy to Project Realization.
Brief description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is fundamental diagram of the present invention.
Fig. 2 is the inventive method flowchart.
Fig. 3 is the workflow diagram of frequency deviation adjusting module of the present invention.
Embodiment
As depicted in figs. 1 and 2, a kind of carrier frequency synchronization method of cordless communication network, the method is that the wireless networking based on multiple devices is realized, described equipment is Wireless Telecom Equipment, and described wireless networking comprises baseband modem, MAC layer module, frequency adjustment amount computing module, frequency deviation adjusting module and radio-frequency module;
Described baseband modem has been used for binary data and the mutual conversion of signal transmission in the air, and in restituted signal, output frequency deviation is to received signal estimated;
Described MAC layer module is responsible for the function such as channel access control, the discovery of neighbouring device of equipment;
Described frequency adjustment amount computing module calculates the frequency adjustment amount of equipment self by recording the device number of transmitted signal and corresponding frequency deviation estimated value;
Described frequency deviation adjusting module is responsible for coming according to frequency adjustment amount the sending and receiving frequency of corrective self, and this frequency deviation adjusting module comprises a Up/Down Conversion device;
Described radio-frequency module is for receiving and transmitted signal;
The present invention specifically comprises the steps:
Step 1, every equipment are being monopolized moment transmission packet, if the packet that can not send, send empty packet, here the networking agreement of supposing equipment allows each equipment to send exclusively packet in certain timeslice, this hypothesis is normally reasonable and common, the exclusivity of Packet Generation guarantees that neighbouring device can adopt traditional frequency deviation algorithm for estimating, thereby makes the inventive method embody larger advantage;
Step 2, every equipment are monitored the signal that neighbouring device sends, find the node number of neighbouring device by MAC layer module, and adopt traditional frequency deviation algorithm for estimating to estimate the frequency deviation value of equipment by baseband modem, obtain the frequency deviation estimated value of relative its neighbouring device of equipment and export this frequency deviation estimated value to frequency adjustment amount computing module, described traditional appraising frequency bias method comprises the maximal possibility estimation class methods based on known transmission sequence, the frequency deviation estimating method based on signal repeated characteristic or utilizes the carrier recovering method of phase-locked loop;
Step 3, frequency adjustment amount computing module calculate the frequency adjustment amount of equipment according to the frequency deviation estimated value of the node number of neighbouring device and equipment, the computational methods of the frequency adjustment amount of described equipment are as follows:
If f
i(n) be equipment i in the carrier frequency value that the n moment sends or receives, this moment neighbouring device k being calculated by step 2 and the frequency deviation estimated value of equipment i, i.e. the frequency-splitting Δ f of equipment k and equipment i
ik(n)=f
k(n)-f
i(n), frequency adjustment amount ε
i(n)=Θ (Δ f
ik(n)), Θ is certain functional transformation, and a kind of fairly simple and effective method is that to get Θ be linear weighted function function, frequency adjustment amount
wherein k is the neighbouring device of i, ω
kit is corresponding weights coefficient;
Step 4, frequency deviation adjusting module are revised the carrier frequency of equipment according to the frequency adjustment amount of equipment in step 3, this correction is that the frequency by adjusting local oscillator is carried out the frequency conversion frequency of control simulation Up/Down Conversion device or utilized the method for Digital Signal Processing to adjust frequency conversion frequency, and after revising, the carrier frequency value of equipment is: f
i(n+1)=f
i(n)+ε
i(n), this carrier frequency is sent by radio-frequency module;
As shown in Figures 2 and 3, the correction adopting in the present embodiment is to utilize the method for Digital Signal Processing to adjust frequency conversion frequency, the realization of this correction is based on a hypothesis: the carrier frequency of equipment receiving and transmitting signal is identical, and the frequency values of the Up/Down Conversion of equipment is strict conformance.This hypothesis is easy to meet in real system, because in radio-frequency module, and the same clock source of the general employing of the local oscillator of Up/Down Conversion circuit.The idiographic flow of frequency deviation adjusting module is: first, frequency adjustment amount is inputed to Direct Digital Synthesizer DDS, to produce the multiple sinusoidal signal of two-way of a frequency, again multiple the two-way of acquisition sinusoidal signal is multiplied by respectively to the baseband signal of base band input and intermediate frequency input, obtains the baseband signal after frequency of amendment.
In addition, described frequency adjustment amount computing module can be coordinated software or is made up of specialized hardware counting circuit by processor, and the input of this frequency adjustment amount computing module is the frequency deviation estimated value of neighbouring device, is output as the frequency adjustment amount of equipment self.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art are in equivalent modification and the variation done according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (8)
1. the carrier frequency synchronization method of a cordless communication network, it is characterized in that: described method is that the wireless networking based on multiple devices is realized, described equipment is Wireless Telecom Equipment, and described wireless networking comprises baseband modem, MAC layer module, frequency adjustment amount computing module, frequency deviation adjusting module and radio-frequency module;
Described baseband modem has been used for binary data and the mutual conversion of signal transmission in the air, and in restituted signal, output frequency deviation is to received signal estimated;
Described MAC layer module is responsible for the discovery of the channel access control of equipment and the node of neighbouring device;
Described frequency adjustment amount computing module calculates the frequency adjustment amount of equipment self by recording the device number of transmitted signal and corresponding frequency deviation estimated value;
Described frequency deviation adjusting module is responsible for coming according to frequency adjustment amount the sending and receiving frequency of corrective self, and this frequency deviation adjusting module comprises a Up/Down Conversion device;
Described radio-frequency module is for receiving and transmitted signal;
Described method comprises the steps:
Step 1, every equipment are being monopolized moment transmission packet;
Step 2, every equipment are monitored the signal that neighbouring device sends, find the node number of neighbouring device by MAC layer module, and adopt frequency deviation algorithm for estimating to estimate the frequency deviation value of equipment by baseband modem, obtain the frequency deviation estimated value of relative its neighbouring device of equipment and export this frequency deviation estimated value to frequency adjustment amount computing module;
Step 3, frequency adjustment amount computing module calculate the frequency adjustment amount of equipment according to the frequency deviation estimated value of the node number of neighbouring device and equipment;
Step 4, frequency deviation adjusting module are revised the carrier frequency of equipment according to the frequency adjustment amount of equipment in step 3, and this 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, is characterized in that: if every equipment in described step 1 is monopolizing the packet that the moment can not send, send empty packet.
3. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, is characterized in that: the appraising frequency bias method in described step 2 comprises the maximal possibility estimation class methods based on known transmission sequence, the frequency deviation estimating method based on signal repeated characteristic or utilizes the carrier recovering method of phase-locked loop.
4. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, is characterized in that:
The computational methods of the frequency adjustment amount of described equipment are as follows:
If f
i(n) be equipment i in the carrier frequency value that the n moment sends or receives, this moment neighbouring device k being calculated by step 2 and the frequency deviation estimated value of equipment i, i.e. the frequency-splitting Δ f of equipment k and equipment i
ik(n)=f
k(n)-f
i(n), frequency adjustment amount ε
i(n)=Θ (Δ f
ik(n)), Θ is certain functional transformation.
5. the carrier frequency synchronization method of a kind of cordless communication network according to claim 4, is characterized in that: described Θ is linear weighted function function, the frequency adjustment amount obtaining is
wherein, k is the neighbouring device of i, ω
kit is corresponding weights coefficient.
6. the carrier frequency synchronization method of a kind of cordless communication network according to claim 4, is characterized in that: described in revise rear equipment carrier frequency value be: f
i(n+1)=f
i(n)+ε
i(n).
7. the carrier frequency synchronization method of a kind of cordless communication network according to claim 1, is characterized in that: the correction in described step 4 is that the frequency by adjusting local oscillator is carried out the frequency conversion frequency of control simulation Up/Down Conversion device or utilized the method for Digital Signal Processing to adjust frequency conversion frequency.
8. the carrier frequency synchronization method of a kind of cordless communication network according to claim 7, it is characterized in that: this correction that the described method of utilizing Digital Signal Processing is adjusted frequency conversion frequency is specially: frequency adjustment amount is inputed to Direct Digital Synthesizer DDS, to produce the multiple sinusoidal signal of two-way of a frequency, again multiple the two-way of acquisition sinusoidal signal is multiplied by respectively to the baseband signal of base band input and intermediate frequency input, obtains the baseband signal after frequency of amendment.
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Cited By (1)
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| CN113219500A (en) * | 2021-03-31 | 2021-08-06 | 成都飞机工业（集团）有限责任公司 | Satellite signal forwarding system used in semi-closed environment |
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