CN110177070A - Signal demodulating method and device - Google Patents
Signal demodulating method and device Download PDFInfo
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- CN110177070A CN110177070A CN201910450828.XA CN201910450828A CN110177070A CN 110177070 A CN110177070 A CN 110177070A CN 201910450828 A CN201910450828 A CN 201910450828A CN 110177070 A CN110177070 A CN 110177070A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
Abstract
The invention discloses a kind of signal demodulating method and devices, this method comprises: the parameter value of broadcast preamble parameter, so as to return to the data acquisition request message for carrying the parameter value of setup parameter after parameter value of the mobile AP according to the parameter value calculation setup parameter of leading parameter；Selected signal demodulation scheme is obtained from signal demodulation scheme set according to the average throughput of each signal demodulation scheme in the parameter value of the mobile AP setup parameter sent and the signal demodulation scheme set pre-established；According to the data that the order of modulation and demodulation pilot tone that include in selected signal demodulation scheme assign subscheme modulation to obtain, modulation data is obtained；The data acquisition response message for carrying modulation data and selected signal demodulation scheme is sent to mobile AP, so that mobile AP demodulates modulation data, the data obtained according to selected signal demodulation scheme.The program may insure that the throughput of the Radio Network System where the train of high-speed railway is maximum, to save Internet resources.
Description
Technical field
The present invention relates to field of communication technology, espespecially a kind of signal demodulating method and device.
Background technique
In recent years, the rapid development of Chinese high-speed railway (High Speed Railway, HSR), has pushed other phases
Emergence and development of pass industry, such as communication, machine-building and electric power etc., and then produce huge economic benefit.Now such as
The present, high-speed rail have been a kind of important trip modes, and the 5G epoch become closer in addition, and mobile communication has become high-speed railway
Service in indispensable a part, the wireless network that passenger uses on the train of high-speed railway at present is still public network, column
For vehicle in high-speed cruising, speed of surfing the Internet is extremely low, poor user experience, therefore develops the wireless network change for specially applying to high-speed railway
It obtains most important.
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology due to
Its spectrum efficiency is high, anti-intersymbol interference, Receiver Complexity is low, bandwidth allocation is flexible, conveniently in conjunction with multi-antenna technology etc.
Advantage obtains the generally approval of academia and industry, and by a variety of communication standards be confirmed as physical layer core transmission technology it
One, therefore, the wireless network of high-speed railway can be considered using OFDM technology.
Train (such as speed per hour 360km/h) in high-speed cruising, the channel of wireless network show fast state, i.e. channel is
The doubly selective channel of frequency selectivity and time selectivity.In order to track doubly selective channel, the signal demodulating method of mainstream is solid at present
Fixed access point (Access Point, AP) is assigned scheme between the subcarrier of OFDM symbol and is accorded with according to preset demodulation pilot tone
Periodic pilot tone is assigned between number, mobile AP estimates the channel at pilot tone according to the channel estimation scheme made an appointment
Value, row interpolation of going forward side by side obtain the channel response value on each subcarrier, and last equilibrium recovers correct signal.
In above-mentioned signal demodulating method, pilot tone assigns scheme to be fixed with channel estimation scheme, is unable to ensure high speed
The throughput of Radio Network System where the train of railway is maximum, to waste Internet resources.
Summary of the invention
The embodiment of the present invention provides a kind of signal demodulating method and device, to solve it is existing in the prior art can not be true
The throughput for protecting the Radio Network System where the train of high-speed railway is maximum, thus the problem of wasting Internet resources.
According to embodiments of the present invention, a kind of signal demodulating method is provided, applied in fixed AP, which comprises
The parameter value of broadcast preamble parameter obtains data requirements so as to receive the parameter value of the leading parameter and have
After parameter value of the mobile AP according to the parameter value calculation setup parameter of the leading parameter, returns and carry the setup parameter
The data acquisition request message of parameter value；
According to the parameter value of the AP of the movement setup parameter sent and the signal demodulation scheme collection pre-established
The average throughput of each signal demodulation scheme obtains selected signal demodulation scheme from the signal demodulation scheme set in conjunction,
The selected signal demodulation scheme include order of modulation, demodulation pilot tone assign subscheme and channel estimation subscheme；
Subscheme modulation is assigned to obtain according to the order of modulation and demodulation pilot tone that include in the selected signal demodulation scheme
Data, obtain modulation data；
The data acquisition response message for carrying the modulation data and the selected signal demodulation scheme is sent to described
Mobile AP obtains described obtain so that the AP of the movement demodulates the modulation data according to the selected signal demodulation scheme
The data taken.
Specifically, if the parameter value of setup parameter includes Signal to Interference plus Noise Ratio SINR value, maximum doppler frequency
It being extended with maximum delay, it includes demodulating pilot tone time domain period and demodulation pilot tones domain period that the demodulation pilot tone, which assigns subscheme,
Then according to every in the parameter value of the AP of the movement setup parameter sent and the signal demodulation scheme set pre-established
The average throughput of a signal demodulation scheme obtains selected signal demodulation scheme from the signal demodulation scheme set, specific to wrap
It includes:
Order of modulation is determined according to the SINR value, and the demodulation pilot tone time domain period is determined according to the maximum doppler frequency
Value range, and according to the maximum delay extend determine demodulation the pilot tone frequency domain period value range；
Obtain from the signal demodulation scheme set pre-established includes the order of modulation, demodulation pilot tone time domain week
The candidate signal demodulation scheme subset of the value range of phase and the value range in the demodulation pilot tone frequency domain period；
Determine the corresponding historical throughput of each candidate signal demodulation scheme in the candidate signal demodulation scheme subset
Whether number reaches setting quantity；
If of the corresponding historical throughput of each candidate signal demodulation scheme in the candidate signal demodulation scheme subset
Number reaches setting quantity, then the maximum signal demodulation scheme of average throughput is determined as selected signal demodulation scheme.
Optionally, further includes:
It handles up if candidate signal demodulation scheme is concentrated at least one corresponding history of candidate signal demodulation scheme
The number of rate not up to sets quantity, then chooses a signal demodulation scheme from the candidate signal demodulation scheme subset, obtain
To selected signal demodulation scheme.
Specifically, determining the value range in demodulation pilot tone time domain period according to the maximum doppler frequency, specifically include:
The value range in demodulation pilot tone time domain period is determined according to the following equation:
Wherein, DPIt indicates demodulation pilot tone time domain period, fdopplerIndicate that maximum doppler frequency, T indicate OFDM symbol
Period.
Specifically, extending the value range for determining the demodulation pilot tone frequency domain period according to the maximum delay, specifically include:
The value range in demodulation pilot tone frequency domain period is determined according to the following equation:
Wherein, DPIf indicates demodulation pilot tone frequency domain period, σmaxIndicate maximum time domain extension, Δ f indicates the son of OFDM symbol
Carrier wave interval.
Optionally, the method also includes:
Receive the corresponding real-time throughput of the selected signal demodulation scheme that the AP of the movement is sent；
Determine the number that the corresponding historical throughput of signal demodulation scheme is selected described in the signal demodulation scheme set
Whether setting quantity is reached；
If the number of the corresponding historical throughput of the selected signal demodulation scheme reaches the setting quantity, institute is calculated
The average value is replaced institute by the average value for stating selected signal demodulation scheme corresponding average throughput and the real-time throughput
State average throughput；If the number of historical throughput corresponding with the selected signal demodulation scheme is not up to the setting number
Amount, then add one for the number of the corresponding historical throughput of the signal demodulation scheme, and calculate the selected signal demodulation scheme
The average value is replaced the average throughput by the average value of corresponding average throughput and the real-time throughput.
According to embodiments of the present invention, a kind of signal demodulating equipment is also provided, applied in fixed AP, described device packet
It includes:
Broadcast module, for the parameter value of broadcast preamble parameter, so as to receive the parameter value of the leading parameter and have
After obtaining parameter value of the AP of the movement of data requirements according to the parameter value calculation setup parameter of the leading parameter, returns and carry
The data acquisition request message of the parameter value of the setup parameter；
Obtain module, the parameter value of the setup parameter for sending according to the AP of the movement and the letter pre-established
The average throughput of each signal demodulation scheme obtains selected from the signal demodulation scheme set in number demodulation scheme set
Signal demodulation scheme, the selected signal demodulation scheme include order of modulation, demodulation pilot tone assign subscheme and channel estimation son
Scheme；
Modulation module, for assigning son according to the order of modulation and demodulation pilot tone that include in the selected signal demodulation scheme
The data that scheme modulation obtains, obtain modulation data；
Sending module, for the data acquisition response for carrying the modulation data and the selected signal demodulation scheme to disappear
Breath is sent to the AP of the movement, so that the AP of the movement demodulates the modulation number according to the selected signal demodulation scheme
According to obtaining the data of the acquisition.
Specifically, if the parameter value of setup parameter includes Signal to Interference plus Noise Ratio SINR value, maximum doppler frequency
It being extended with maximum delay, it includes demodulating pilot tone time domain period and demodulation pilot tones domain period that the demodulation pilot tone, which assigns subscheme,
The then acquisition module, the parameter value of the setup parameter for being sent according to the AP of the movement and the signal pre-established
The average throughput of each signal demodulation scheme obtains selected letter from the signal demodulation scheme set in demodulation scheme set
Number demodulation scheme, is specifically used for:
Order of modulation is determined according to the SINR value, and the demodulation pilot tone time domain period is determined according to the maximum doppler frequency
Value range, and according to the maximum delay extend determine demodulation the pilot tone frequency domain period value range；
Obtain from the signal demodulation scheme set pre-established includes the order of modulation, demodulation pilot tone time domain week
The candidate signal demodulation scheme subset of the value range of phase and the value range in the demodulation pilot tone frequency domain period；
Determine the corresponding historical throughput of each candidate signal demodulation scheme in the candidate signal demodulation scheme subset
Whether number reaches setting quantity；
If of the corresponding historical throughput of each candidate signal demodulation scheme in the candidate signal demodulation scheme subset
Number reaches setting quantity, then the maximum signal demodulation scheme of average throughput is determined as selected signal demodulation scheme.
Optionally, the acquisition module, is also used to:
It handles up if candidate signal demodulation scheme is concentrated at least one corresponding history of candidate signal demodulation scheme
The number of rate not up to sets quantity, then chooses a signal demodulation scheme from the candidate signal demodulation scheme subset, obtain
To selected signal demodulation scheme.
Specifically, the acquisition module, for determining the demodulation pilot tone time domain period according to the maximum doppler frequency
Value range is specifically used for:
The value range in demodulation pilot tone time domain period is determined according to the following equation:
Wherein, DPIt indicates demodulation pilot tone time domain period, fdopplerIndicate that maximum doppler frequency, T indicate OFDM symbol
Period.
Specifically, the acquisition module, determines taking for demodulation pilot tone frequency domain period for extending according to the maximum delay
It is worth range, is specifically used for:
The value range in demodulation pilot tone frequency domain period is determined according to the following equation:
Wherein, DPIf indicates demodulation pilot tone frequency domain period, σmaxIndicate maximum time domain extension, Δ f indicates the son of OFDM symbol
Carrier wave interval.
Optionally, described device further include:
Receiving module, the selected signal demodulation scheme that the AP for receiving the movement is sent is corresponding to be handled up in real time
Rate；
Determining module selectes the corresponding history of signal demodulation scheme for determining described in the signal demodulation scheme set
Whether the number of throughput reaches setting quantity；
Computing module, if the number for the corresponding historical throughput of the selected signal demodulation scheme reaches the setting
Quantity then calculates the average value of the selected signal demodulation scheme corresponding average throughput and the real-time throughput, by institute
It states average value and replaces the average throughput；If the number of historical throughput corresponding with the selected signal demodulation scheme does not reach
To the setting quantity, then the number of the corresponding historical throughput of the signal demodulation scheme is added one, and calculated described selected
The average value of the corresponding average throughput of signal demodulation scheme and the real-time throughput is replaced the average value described average
Throughput.
The present invention has the beneficial effect that:
The embodiment of the present invention provides a kind of signal demodulating method and device, by the parameter value of broadcast preamble parameter, so that
It receives the parameter value of the leading parameter and has the AP for the movement for obtaining data requirements according to the parameter value of the leading parameter
After the parameter value for calculating setup parameter, the data acquisition request message for carrying the parameter value of the setup parameter is returned；According to institute
The parameter value for stating the setup parameter that mobile AP is sent and each signal solution in the signal demodulation scheme set pre-established
The average throughput of tune scheme obtains selected signal demodulation scheme, the selected signal solution from the signal demodulation scheme set
Tune scheme include order of modulation, demodulation pilot tone assign subscheme and channel estimation subscheme；According to the selected signal demodulation side
The data that the order of modulation and demodulation pilot tone for including in case assign subscheme modulation to obtain, obtain modulation data；Described in carrying
The data acquisition response message of modulation data and the selected signal demodulation scheme is sent to the AP of the movement, so that the shifting
Dynamic AP demodulates the modulation data according to the selected signal demodulation scheme, obtains the data of the acquisition.In the program, no
Fixed signal demodulation scheme is reused, but selects selected signal demodulation side from the signal demodulation scheme set pre-established
Case carries out signal modulation and demodulation, compared with the existing technology, it can be ensured that the Radio Network System where the train of high-speed railway
Throughput it is maximum, to save Internet resources.
Detailed description of the invention
Fig. 1 is a kind of flow chart of signal demodulating method in the embodiment of the present invention；
Fig. 2 is the method flow diagram of S12 in the embodiment of the present invention；
Fig. 3 is the schematic diagram of the downlink frame structure in the embodiment of the present invention；
Fig. 4 is the schematic diagram in the demodulation pilot tone time domain period in the embodiment of the present invention in descending transmission channel；
Fig. 5 is the schematic diagram in the demodulation pilot tone frequency domain period in the embodiment of the present invention in descending transmission channel；
Fig. 6 is in the embodiment of the present invention in the signal of the emulation statistical result of WINNER II D2a channel far point 300km/h
Figure；
Fig. 7 is in the embodiment of the present invention in the signal of the emulation statistical result of WINNER II D2a channel near point 300km/h
Figure；
Fig. 8 is a kind of structural schematic diagram of signal demodulating equipment in the embodiment of the present invention.
Specific embodiment
For the throughput of the Radio Network System existing in the prior art being unable to ensure where the train of high-speed railway
Maximum, thus the problem of wasting Internet resources, the embodiment of the present invention provides a kind of signal demodulating method, applied to fixed AP
In, the AP of the fixation can be, but not limited to be some fixed bit being arranged in the wireless network of high-speed railway near high-speed railway
The AP set, the process of this method is as shown in Figure 1, execute that steps are as follows:
S11: the parameter value of broadcast preamble parameter obtains data requirements so as to receive the parameter value of leading parameter and have
After parameter value of the mobile AP according to the parameter value calculation setup parameter of leading parameter, the parameter value for carrying setup parameter is returned
Data acquisition request message.
Fixed AP can set the parameter value of the leading parameter of periodic broadcasting, wherein the setting period can be according to practical need
It is set.
If the AP of the movement around the AP of the fixation receives the parameter value and obtains message, and the AP of the movement just
When needing to obtain data to fixed AP, the AP of the movement can be according to the parameter of the parameter value calculation setup parameter of leading parameter
After value, the data acquisition request message for carrying the parameter value of setup parameter is returned.
Wherein, mobile AP can be, but not limited to be the AP being set on the train of high-speed railway.
S12: according in the parameter value of the mobile AP setup parameter sent and the signal demodulation scheme set pre-established
The average throughput of each signal demodulation scheme obtains selected signal demodulation scheme from signal demodulation scheme set.
Signal demodulation scheme set can be pre-established, each signal demodulation scheme therein includes order of modulation, demodulation
Pilot tone assigns subscheme and channel estimation subscheme.Wherein, order of modulation can be set according to actual needs, demodulate pilot tone
Assigning subscheme specifically can be the demodulation pilot tone time domain period and demodulates the various combinations in pilot tones domain period, channel estimation side
Case can be, but not limited to include following four seed schemes:
Subscheme 1:LS channel estimation+linear interpolation+MMSE is balanced；
Subscheme 2:LS+DFT channel estimation+linear interpolation+MMSE is balanced；
Subscheme 3:LS channel estimation+cubic spline interpolation+MMSE is balanced；
Subscheme 4:LS+DFT channel estimation+cubic spline interpolation+MMSE is balanced.
After fixed AP gets the parameter value for the setup parameter that mobile AP is sent, joined according to the setting that mobile AP is sent
The average throughput of each signal demodulation scheme is from signal solution in several parameter value and the signal demodulation scheme set pre-established
Selected signal demodulation scheme is obtained in tune scheme set
S13: subscheme modulation is assigned to obtain according to the order of modulation and demodulation pilot tone that include in selected signal demodulation scheme
Data, obtain modulation data.
S14: being sent to mobile AP for the data acquisition response message for carrying modulation data and selected signal demodulation scheme,
So that mobile AP demodulates modulation data, the data obtained according to selected signal demodulation scheme.
In the program, fixed signal demodulation scheme is not used, but from the signal demodulation scheme set pre-established
It is middle to select selected signal demodulation scheme, signal modulation and demodulation are carried out, compared with the existing technology, it can be ensured that the column of high-speed railway
The throughput of Radio Network System where vehicle is maximum, to save Internet resources.
Specifically, leading in above-mentioned S11 can be, but not limited to include short leader sequence (S-Preamble), long preambles sequence
It arranges (L-Preamble), the parameter value of setup parameter can be, but not limited to include Signal to Interference plus Noise Ratio (Signal to
Interference plus Noise Ratio, SINR) value, maximum doppler frequency and maximum delay extension, it moves at this time
AP includes: to be estimated according to long preamble according to the specific calculating process of parameter value of the parameter value calculation setup parameter of leading parameter
SINR value；Long preamble carries out time domain channel estimation based on the received, and obtains time domain letter according to the time domain channel estimated value
The multi-path information in road, and maximum delay extension is calculated according to the multi-path information；The position of according to train speed and relatively fixed AP
Set calculating maximum doppler frequency.
If it includes demodulation pilot tone time domain period and demodulation pilot tones domain period, above-mentioned S12 that demodulation pilot tone, which assigns subscheme,
In the setup parameter sent according to mobile AP parameter value and the signal demodulation scheme set that pre-establishes in each signal
The average throughput of demodulation scheme obtains selected signal demodulation scheme from signal demodulation scheme set, realizes process such as Fig. 2 institute
Show, specifically include:
S121: determining order of modulation according to SINR value, determines the demodulation pilot tone time domain period according to maximum doppler frequency
Value range, and the value range for determining the demodulation pilot tone frequency domain period is extended according to maximum delay.
Specifically, determining the value range in demodulation pilot tone time domain period according to maximum doppler frequency, realize that process is specific
Include:
The value range in demodulation pilot tone time domain period is determined according to the following equation:
Wherein, DPIt indicates demodulation pilot tone time domain period, fdopplerIndicate that maximum doppler frequency, T indicate OFDM symbol
Period.DPIt should also be greater than 1, because illustrate to assign is all demodulation pilot tone if being equal to 1, will not carry data.
Specifically, extending the value range for determining the demodulation pilot tone frequency domain period according to maximum delay, realization process is specifically wrapped
It includes:
The value range in demodulation pilot tone frequency domain period is determined according to the following equation:
Wherein, DPIf indicates demodulation pilot tone frequency domain period, σmaxIndicate maximum time domain extension, Δ f indicates the son of OFDM symbol
Carrier wave interval.DPIf should also be greater than 1, because illustrate to assign is all demodulation pilot tone if being equal to 1, will not carry data.
S122: obtaining from the signal demodulation scheme set pre-established includes order of modulation, demodulation pilot tone time domain period
Value range and demodulation the pilot tones domain period value range candidate signal demodulation scheme subset.
In signal demodulation scheme set include many signal demodulation schemes, can according to the order of modulation obtained in S121,
The value range and the value range in demodulation pilot tones domain period for demodulating the pilot tone time domain period choose a part of signal demodulation scheme,
Obtain candidate signal demodulation scheme subset.
S123: the corresponding historical throughput of each candidate signal demodulation scheme in candidate signal demodulation scheme subset is determined
Whether number reaches setting quantity, if the corresponding history of each candidate signal demodulation scheme gulps down in candidate signal demodulation scheme subset
The number for spitting rate reaches setting quantity, then executes S124；If candidate signal demodulation scheme is concentrated at least one candidate's letter
The number of number corresponding historical throughput of demodulation scheme not up to sets quantity, then executes S125.
S124: the maximum signal demodulation scheme of average throughput is determined as selected signal demodulation scheme.
S125: choosing a signal demodulation scheme from candidate signal demodulation scheme subset, obtains selected signal demodulation side
Case.
A signal demodulation scheme can be randomly selected from candidate signal demodulation scheme subset, obtain selected signal demodulation
Scheme；The smallest signal demodulation scheme of number that historical throughput can also be chosen from candidate signal demodulation scheme subset, obtains
To selected signal demodulation scheme.
Specifically, downlink frame structure of the fixed AP to the mobile AP data acquisition response message sent is carried in S14,
As shown in Figures 3 and 4.Referring first to Fig. 3, short leader sequence (S-Preamble) is used as system and slightly synchronizes；Long preamble (L-
Preamble) it is used as the channel estimation of the synchronization of system essence and control channel；System information channel (SICH) is used as broadcast frame structure
Configuration；It transmits control channel (CCH) and is used as descending transmission channel scheduling of resource；Descending transmission channel (DL-TCH) is used as lower industry
Business transmission and downlink signaling transmission；Downlink protection interval (DGI), which is used as, comes downwards to uplink transmitting-receiving protection interval.Referring back to Fig. 4, solution
Pilot tone (DPI) is adjusted to be used as demodulation signaling and data.
Demodulation pilot tone in frame structure has extremely important effect, it is periodically distributed in descending transmission channel,
By adjusting demodulation pilot tone time domain period (DPIt) as shown in Figure 4 and demodulation pilot tone frequency domain period (DPIf) as shown in Figure 5
The doubly selective channel in wireless network to track high-speed railway.DPInum indicates demodulation pilot tone time domain continuous symbol number, in order to save
Resource-saving can be set to 1.
Optionally, the above method further include:
Receive the corresponding real-time throughput of selected signal demodulation scheme that mobile AP is sent；
Determine whether the number that the corresponding historical throughput of signal demodulation scheme is selected in signal demodulation scheme set reaches
Set quantity；
If the number of the selected corresponding historical throughput of signal demodulation scheme reaches setting quantity, selected signal solution is calculated
The average value of tune scheme corresponding average throughput and real-time throughput, replaces average throughput for average value；If with selected letter
The number of number corresponding historical throughput of demodulation scheme not up to sets quantity, then modulates signals into the corresponding history of scheme and handle up
The number of rate adds one, and calculates the average value of selected signal demodulation scheme corresponding average throughput and real-time throughput, will put down
Mean value replaces average throughput.
In order to ensure the accuracy of the throughput in signal demodulation scheme set, can be sent according to mobile AP selected
The corresponding real-time throughput of signal demodulation scheme is peaceful come the number for updating the corresponding historical throughput of selected signal demodulation scheme
Equal throughput.
What can be received by physical layer link single user single-shot list emulates to verify above-described embodiment under doubly selective channel
Characteristic, emulation use WINNER II channel, it is developed by SCME channel, are channel models relatively advanced at present.Its
Middle D2a scene is the channel model of the wireless network of high-speed railway, supports speed 0-350km/h, bandwidth 100MHz, frequency range
2-6GHz.It is as follows to emulate basic parameter:
OFDM basic parameter is as shown in table 1 below:
Table 1
The setting of WINNER II channel parameter is as shown in table 2 below:
Table 2
Using subscheme 1, subscheme 2, subscheme 3 and the subscheme 4 mentioned in S12 when emulation, the operation of train is set
Distance is 100m, can collect the comparison that enough data carry out the reliability of different subschemes in this way.For convenience, will
The DPIf of demodulation pilot tone is set as 1, only DPIt variation.
Below in the emulation of the optimal corresponding scheme of handling up of WINNER II D2a channel far point 300km/h statistics (such as Fig. 6
Shown, far point sets 16QAM, 1/2 code rate, BCC coding, 17dB SINR (value that PER is about 10% is measured before being)), operation
100m corresponds to more than 10000 data packets.As shown in table 3 below, in far point, 300km/h, 17dB SINR, system subscheme
2, it is 114.1007Mbps that average maximum throughput rate is got at DPIt=32 (optimal subscheme under conditions present).
Table 3
It is below the emulation statistics of the optimal corresponding scheme of handling up in WINNER II D2a channel near point 300km/h (as schemed
Shown in 7, near point sets 64QAM, 3/4 code rate, BCC coding, 25dB SINR (value that PER is about 10% is measured before being)), it runs
100m corresponds to more than 10000 data packets.As shown in table 4 below near point, 300km/h, 25dB SINR, system subscheme
4, it is 210.1428Mbps that average maximum throughput rate is got at DPIt=8 (optimal subscheme under conditions present)；
| Subscheme | Maximum throughput rate/Mbps | Corresponding DPIt |
| Subscheme 1 | 197.7234 | 8 |
| Subscheme 2 | 198.8568 | 8 |
| Subscheme 3 | 205.2204 | 8 |
| Subscheme 4 | 210.1428 | 8 |
Table 4
It can be seen that, by using the signal demodulating method of the present embodiment, it can be found optimal from above-mentioned emulation
Scheme makes the throughput highest of system.
Based on the same inventive concept, the embodiment of the present invention provides a kind of signal demodulating equipment, applied in fixed AP, is somebody's turn to do
The structure of device is as shown in Figure 8, comprising:
Broadcast module 81, for the parameter value of broadcast preamble parameter, so as to receive the parameter value of leading parameter and obtain
After taking parameter value of the AP of the movement of data requirements according to the parameter value calculation setup parameter of leading parameter, returns and carry setting ginseng
The data acquisition request message of several parameter values；
Module 82 is obtained, the parameter value for the setup parameter according to mobile AP transmission is demodulated with the signal pre-established
The average throughput of each signal demodulation scheme obtains selected signal demodulation side from signal demodulation scheme set in scheme set
Case, selected signal demodulation scheme include that order of modulation, demodulation pilot tone assign subscheme and channel estimation subscheme；
Modulation module 83, for assigning son side according to the order of modulation and demodulation pilot tone that include in selected signal demodulation scheme
The data that case modulation obtains, obtain modulation data；
Sending module 84, the data acquisition response message for that will carry modulation data and selected signal demodulation scheme are sent
To mobile AP, so that mobile AP demodulates modulation data, the data obtained according to selected signal demodulation scheme.
In the program, fixed signal demodulation scheme is not used, but from the signal demodulation scheme set pre-established
It is middle to select selected signal demodulation scheme, signal modulation and demodulation are carried out, compared with the existing technology, it can be ensured that the column of high-speed railway
The throughput of Radio Network System where vehicle is maximum, to save Internet resources.
Specifically, if the parameter value of setup parameter includes Signal to Interference plus Noise Ratio SINR value, maximum doppler frequency
It is extended with maximum delay, it includes demodulation pilot tone time domain period and demodulation pilot tones domain period that demodulation pilot tone, which assigns subscheme, then obtains
In modulus block 82, the parameter value of the setup parameter for being sent according to mobile AP and the signal demodulation scheme set pre-established
The average throughput of each signal demodulation scheme obtains selected signal demodulation scheme from signal demodulation scheme set, specific to use
In:
Order of modulation is determined according to SINR value, and the value model in demodulation pilot tone time domain period is determined according to maximum doppler frequency
It encloses, and extends the value range for determining the demodulation pilot tone frequency domain period according to maximum delay；
Obtain from the signal demodulation scheme set pre-established includes order of modulation, the value for demodulating the pilot tone time domain period
The candidate signal demodulation scheme subset of range and the value range in demodulation pilot tones domain period；
Determine the number of the corresponding historical throughput of each candidate signal demodulation scheme in candidate signal demodulation scheme subset
Whether setting quantity is reached；
If the number of the corresponding historical throughput of each candidate signal demodulation scheme is equal in candidate signal demodulation scheme subset
Reach setting quantity, then the maximum signal demodulation scheme of average throughput is determined as selected signal demodulation scheme.
Optionally, module 82 is obtained, is also used to:
If candidate signal demodulation scheme is concentrated at least one corresponding historical throughput of candidate signal demodulation scheme
Number not up to sets quantity, then a signal demodulation scheme is chosen from candidate signal demodulation scheme subset, obtains selected letter
Number demodulation scheme.
Specifically, module 82 is obtained, for determining the value model in demodulation pilot tone time domain period according to maximum doppler frequency
It encloses, is specifically used for:
The value range in demodulation pilot tone time domain period is determined according to the following equation:
Wherein, DPIt indicates demodulation pilot tone time domain period, fdopplerIndicate that maximum doppler frequency, T indicate OFDM symbol
Period.
Specifically, module 82 is obtained, for extending the value range for determining the demodulation pilot tone frequency domain period according to maximum delay,
It is specifically used for:
The value range in demodulation pilot tone frequency domain period is determined according to the following equation:
Wherein, DPIf indicates demodulation pilot tone frequency domain period, σmaxIndicate maximum time domain extension, Δ f indicates the son of OFDM symbol
Carrier wave interval.
Optionally, above-mentioned apparatus further include:
Receiving module, the corresponding real-time throughput of selected signal demodulation scheme sent for receiving mobile AP；
Determining module selectes the corresponding historical throughput of signal demodulation scheme for determining in signal demodulation scheme set
Whether number reaches setting quantity；
Computing module, if the number for selecting the corresponding historical throughput of signal demodulation scheme reaches setting quantity,
The average value for calculating selected signal demodulation scheme corresponding average throughput and real-time throughput, replaces average throughput for average value
Rate；If the number of historical throughput corresponding with selected signal demodulation scheme not up to sets quantity, scheme is modulated signals into
The number of corresponding historical throughput adds one, and calculates the selected corresponding average throughput of signal demodulation scheme and real-time throughput
Average value, average value is replaced into average throughput.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although alternative embodiment of the invention has been described, created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So the following claims are intended to be interpreted as include can
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of signal demodulating method, applied in fixed access point AP, which is characterized in that the described method includes:
The parameter value of broadcast preamble parameter, so as to receive the parameter value of the leading parameter and have the movement for obtaining data requirements
Parameter value of the AP according to the parameter value calculation setup parameter of the leading parameter after, return to the parameter for carrying the setup parameter
The data acquisition request message of value；
According in the parameter value of the AP of the movement setup parameter sent and the signal demodulation scheme set pre-established
The average throughput of each signal demodulation scheme obtains selected signal demodulation scheme from the signal demodulation scheme set, described
Selected signal demodulation scheme includes that order of modulation, demodulation pilot tone assign subscheme and channel estimation subscheme；
The number for assigning subscheme modulation to obtain according to the order of modulation and demodulation pilot tone that include in the selected signal demodulation scheme
According to obtaining modulation data；
The data acquisition response message for carrying the modulation data and the selected signal demodulation scheme is sent to the movement
AP obtain the acquisition so that the AP of the movement demodulates the modulation data according to the selected signal demodulation scheme
Data.
2. the method as described in claim 1, which is characterized in that if the parameter value of setup parameter includes signal and interference plus noise
It is extended than SINR value, maximum doppler frequency and maximum delay, it includes demodulation pilot tone time domain that the demodulation pilot tone, which assigns subscheme,
Period and demodulation the pilot tones domain period, then according to the AP of the movement send the setup parameter parameter value and pre-establish
Signal demodulation scheme set in the average throughput of each signal demodulation scheme obtained from the signal demodulation scheme set
Selected signal demodulation scheme, specifically includes:
Order of modulation is determined according to the SINR value, and taking for demodulation pilot tone time domain period is determined according to the maximum doppler frequency
It is worth range, and extends the value range for determining the demodulation pilot tone frequency domain period according to the maximum delay；
Obtain from the signal demodulation scheme set pre-established includes the order of modulation, the demodulation pilot tone time domain period
The candidate signal demodulation scheme subset of value range and the value range in the demodulation pilot tone frequency domain period；
Determine the number of the corresponding historical throughput of each candidate signal demodulation scheme in the candidate signal demodulation scheme subset
Whether setting quantity is reached；
If the number of the corresponding historical throughput of each candidate signal demodulation scheme is equal in the candidate signal demodulation scheme subset
Reach setting quantity, then the maximum signal demodulation scheme of average throughput is determined as selected signal demodulation scheme.
3. method according to claim 2, which is characterized in that further include:
If candidate signal demodulation scheme is concentrated at least one corresponding historical throughput of candidate signal demodulation scheme
Number not up to sets quantity, then chooses a signal demodulation scheme from the candidate signal demodulation scheme subset, selected
Determine signal demodulation scheme.
4. method according to claim 2, which is characterized in that determine demodulation pilot tone time domain according to the maximum doppler frequency
The value range in period, specifically includes:
The value range in demodulation pilot tone time domain period is determined according to the following equation:
Wherein, DPIt indicates demodulation pilot tone time domain period, fdopplerIndicate that maximum doppler frequency, T indicate the week of OFDM symbol
Phase.
5. method according to claim 2, which is characterized in that extended according to the maximum delay and determine demodulation pilot tone frequency domain week
The value range of phase, specifically includes:
The value range in demodulation pilot tone frequency domain period is determined according to the following equation:
Wherein, DPIf indicates demodulation pilot tone frequency domain period, σmaxIndicate maximum time domain extension, Δ f indicates the subcarrier of OFDM symbol
Interval.
6. method a method as claimed in any one of claims 1 to 5, which is characterized in that the method also includes:
Receive the corresponding real-time throughput of the selected signal demodulation scheme that the AP of the movement is sent；
Determine described in the signal demodulation scheme set select the corresponding historical throughput of signal demodulation scheme number whether
Reach setting quantity；
If the number of the corresponding historical throughput of the selected signal demodulation scheme reaches the setting quantity, the choosing is calculated
The average value for determining the corresponding average throughput of signal demodulation scheme and the real-time throughput is described flat by average value replacement
Equal throughput；If the number of historical throughput corresponding with the selected signal demodulation scheme is not up to the setting quantity,
The number of the corresponding historical throughput of the signal demodulation scheme is added one, and it is corresponding to calculate the selected signal demodulation scheme
The average value is replaced the average throughput by the average value of average throughput and the real-time throughput.
7. a kind of signal demodulating equipment, applied in fixed AP, which is characterized in that described device includes:
Broadcast module, for the parameter value of broadcast preamble parameter, so as to receive the parameter value of the leading parameter and have acquisition
After parameter value of the AP of the movement of data requirements according to the parameter value calculation setup parameter of the leading parameter, return described in carrying
The data acquisition request message of the parameter value of setup parameter；
Obtain module, the parameter value of the setup parameter for sending according to the AP of the movement and the signal solution pre-established
The average throughput of each signal demodulation scheme obtains selected signal from the signal demodulation scheme set in tune scheme set
Demodulation scheme, the selected signal demodulation scheme include order of modulation, demodulation pilot tone assign subscheme and channel estimation subscheme；
Modulation module, for assigning subscheme according to the order of modulation and demodulation pilot tone that include in the selected signal demodulation scheme
The data obtained are modulated, modulation data is obtained；
Sending module, the data acquisition response message for that will carry the modulation data and the selected signal demodulation scheme are sent out
The AP of the movement is given, so that the AP of the movement demodulates the modulation data according to the selected signal demodulation scheme, is obtained
To the data of the acquisition.
8. device as claimed in claim 7, which is characterized in that if the parameter value of setup parameter includes signal and interference plus noise
It is extended than SINR value, maximum doppler frequency and maximum delay, it includes demodulation pilot tone time domain that the demodulation pilot tone, which assigns subscheme,
Period and demodulation pilot tones domain period, then the acquisition module, the setup parameter for being sent according to the AP of the movement
Parameter value and the signal demodulation scheme set that pre-establishes in each signal demodulation scheme average throughput from the signal
Selected signal demodulation scheme is obtained in demodulation scheme set, is specifically used for:
Order of modulation is determined according to the SINR value, and taking for demodulation pilot tone time domain period is determined according to the maximum doppler frequency
It is worth range, and extends the value range for determining the demodulation pilot tone frequency domain period according to the maximum delay；
Obtain from the signal demodulation scheme set pre-established includes the order of modulation, the demodulation pilot tone time domain period
The candidate signal demodulation scheme subset of value range and the value range in the demodulation pilot tone frequency domain period；
Determine the number of the corresponding historical throughput of each candidate signal demodulation scheme in the candidate signal demodulation scheme subset
Whether setting quantity is reached；
If the number of the corresponding historical throughput of each candidate signal demodulation scheme is equal in the candidate signal demodulation scheme subset
Reach setting quantity, then the maximum signal demodulation scheme of average throughput is determined as selected signal demodulation scheme.
9. device as claimed in claim 8, which is characterized in that the acquisition module is also used to:
If candidate signal demodulation scheme is concentrated at least one corresponding historical throughput of candidate signal demodulation scheme
Number not up to sets quantity, then chooses a signal demodulation scheme from the candidate signal demodulation scheme subset, selected
Determine signal demodulation scheme.
10. device as claimed in claim 8, which is characterized in that the acquisition module, for according to the maximum Doppler frequency
The value range for determining the demodulation pilot tone time domain period is moved, is specifically used for:
The value range in demodulation pilot tone time domain period is determined according to the following equation:
Wherein, DPIt indicates demodulation pilot tone time domain period, fdopplerIndicate that maximum doppler frequency, T indicate the week of OFDM symbol
Phase.
11. device as claimed in claim 8, which is characterized in that the acquisition module, for being extended according to the maximum delay
The value range for determining the demodulation pilot tone frequency domain period, is specifically used for:
The value range in demodulation pilot tone frequency domain period is determined according to the following equation:
Wherein, DPIf indicates demodulation pilot tone frequency domain period, σmaxIndicate maximum time domain extension, Δ f indicates the subcarrier of OFDM symbol
Interval.
12. the device as described in claim 7-11 is any, which is characterized in that described device further include:
Receiving module, the corresponding real-time throughput of the selected signal demodulation scheme that the AP for receiving the movement is sent；
Determining module, for determining that selecting the corresponding history of signal demodulation scheme described in the signal demodulation scheme set handles up
Whether the number of rate reaches setting quantity；
Computing module, if the number for the corresponding historical throughput of the selected signal demodulation scheme reaches the setting number
Amount, then calculate the average value of the selected signal demodulation scheme corresponding average throughput and the real-time throughput, will be described
Average value replaces the average throughput；If the number of historical throughput corresponding with the selected signal demodulation scheme is not up to
The number of the corresponding historical throughput of the signal demodulation scheme is then added one, and calculates the selected letter by the setting quantity
The average value of number corresponding average throughput of demodulation scheme and the real-time throughput is averagely gulped down average value replacement is described
Spit rate.
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