CN103703730B - Channel parameter estimation method and device, the method and device of assessment dissemination channel environment - Google Patents
Channel parameter estimation method and device, the method and device of assessment dissemination channel environment Download PDFInfo
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- CN103703730B CN103703730B CN201280027882.XA CN201280027882A CN103703730B CN 103703730 B CN103703730 B CN 103703730B CN 201280027882 A CN201280027882 A CN 201280027882A CN 103703730 B CN103703730 B CN 103703730B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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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
- H04L25/0212—Channel estimation of impulse response
- H04L25/0216—Channel estimation of impulse response with estimation of channel length
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Abstract
The invention discloses a kind of channel parameter estimation method and device, the method includes according to the point of the time delay corresponding to power peak in the preset range found in the time delay power spectrum data of same snap, determines the required footpath number estimated of described snap；According to the footpath number estimated required for described fixed described snap, utilize channel parameter estimation algorithm that each footpath in the described footpath number taking required estimation soon is carried out channel parameter estimation, until estimating to obtain the channel parameter in each footpath of all snaps of channel.By the way, the present invention can improve accuracy and the convergence rate of channel parameter estimation.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of channel parameter estimation method and dress
Put, assess the method and device of dissemination channel environment.
Background technology
Channel is one of principal element of restriction communication system performance, and it is under various communication standards
The algorithm performance of link simulation and system emulation plays vital effect.Radio propagation channel
In the information that comprises have: the flood gentle angle of pitch, ripple of the number in footpath, the time delay in every footpath, ripple reaches
Level and the angle of pitch, Doppler and polarization information.
Utilize channel measuring device can obtain channel impulse response, arranged by diameter number and believe
Road parameter estimation algorithm can obtain above-mentioned channel parameter.Replace in prior art broad sense subspace
Expect maximum (SAGE, Space Alternating Generalized
Expectation-maximization), in algorithm, the setting of footpath number is an empirical value, each
Individual snap footpath number to be estimated is just as, it is impossible to enough carry out adaptive according to the change of scene
Adjust.In another prior art, respond according to channel delay, in certain dynamic range
DELAY RESPONSE is divided into multiple multipath bag, by estimating a number of multipath in these multipath bags,
Obtain relatively comprehensively channel estimation parameter.
Present inventor finds in long-term research and development, the setting of above-mentioned prior art diameter number
Can not corresponding to change snap, the footpath of estimation be concentrated in around prominent time delay or
Around several time delay points, the accuracy that impact is estimated, and convergence rate is slow.
Summary of the invention
The technical problem that present invention mainly solves be to provide a kind of channel parameter estimation method and device,
The method and device of assessment dissemination channel environment, it is possible to increase the accuracy of channel parameter estimation and receipts
Hold back speed.
A first aspect of the present invention provides a kind of channel parameter estimation method, including according to same
Corresponding to power peak in the preset range found in the time delay power spectrum data of snap time
Prolong a little, determine the required footpath number estimated of described snap；According to described fixed described snap institute
Need the footpath number estimated, utilize channel parameter estimation algorithm to the described footpath taking required estimation soon
Each footpath in number carries out channel parameter estimation, until estimating to obtain each footpath of all snaps of channel
Channel parameter.
In the first possible implementation of first aspect, described preset range is to preset time delay
Scope or predetermined power scope.
In conjunction with the first possible implementation of first aspect, the second in first aspect may
Implementation in, it is pre-that described basis has found in the time delay power spectrum data of same snap
If the time delay point corresponding to the power peak in scope, determine the required footpath number estimated of described snap
Step before, including: obtain the described same average time delay merit taking all subchannels soon
Rate modal data；According to the described time delay power spectrum data obtained, it is thus achieved that the described maximum work taken soon
Rate or the described peak power taken soon and average noise level；According to the described maximum work taken soon
Rate or the described peak power taken soon and average noise level, determine described predetermined power scope；
Described time delay power spectrum data is searched corresponding to the power peak in the range of described predetermined power
Time delay point.
In conjunction with the first possible implementation of first aspect or first aspect or first aspect
The implementation that the second is possible, in the third possible implementation of first aspect, described
According to the power peak in the preset range found in the time delay power spectrum data of same snap
Time delay point corresponding to value, before determining the step of the required footpath number estimated of described snap, including:
In the time delay power spectrum data of described same snap, if distinguish in time delay difference preset away from
From two multipaths, then according to found in the time delay power spectrum data of same snap preset
In the range of the point of the time delay corresponding to power peak, determine the time delay point corresponding to described power peak
The required footpath number estimated is predetermined number.
A second aspect of the present invention is to provide a kind of method assessing dissemination channel environment, including: root
According to the power peak in the preset range found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of described snap；According to described fixed
The required footpath number estimated of described snap, utilize channel parameter estimation algorithm to described take soon required
Each footpath in the number of footpath to be estimated carries out channel parameter estimation, until it is all soon to estimate to obtain channel
The channel parameter in each footpath clapped；Channel ginseng to each footpath of the described all snaps estimated and obtain
Number is added up, it is thus achieved that the statistical result of described channel, to assess the communication environments of described channel.
A third aspect of the present invention is to provide a kind of channel parameter estimation device, and described device includes:
First determines module and parameter estimation module；Described first determine module for according to same soon
The time delay corresponding to power peak in the preset range found in the time delay power spectrum data clapped
Point, determines the required footpath number estimated of described snap, and the footpath number will estimated required for described snap
Send to described parameter estimation module；Described parameter estimation module is used for receiving described first and determines mould
The required footpath number estimated of the described snap that block sends, needed for described fixed described snap
Footpath number to be estimated, utilizes channel parameter estimation algorithm to the described footpath number taking required estimation soon
In each footpath carry out channel parameter estimation, until estimating to obtain each footpath of channel all snaps
Channel parameter.
In the first possible implementation of the third aspect, described preset range is to preset time delay
Scope or predetermined power scope.
In conjunction with the first possible implementation of the third aspect, the second in the third aspect may
Implementation in, described device also includes: acquisition module, obtains module, second determine module
And lookup module；Described acquisition module described same takes all subchannels soon for obtaining
Average time delay power spectrum data, and send described time delay power spectrum data to described acquisition module；
Described acquisition module is for receiving the time delay power spectrum data that described acquisition module sends, according to acquisition
Described time delay power spectrum data, it is thus achieved that the described peak power taken soon or described take soon
High-power and average noise level, and determine that module sends the described maximum taken soon to described second
Power or the described peak power taken soon and average noise level；Described second determine module for
Receive the described peak power taken soon or the described maximum taken soon that described acquisition module sends
Power and average noise level, according to the described peak power taken soon or the described maximum taken soon
Power and average noise level, determine described predetermined power scope, and send to described lookup module
Described predetermined power scope；To determine that module sends pre-for receiving described second for described lookup module
If power bracket, described time delay power spectrum data is searched the power in the range of described predetermined power
Time delay point corresponding to peak value.
In conjunction with the first possible implementation of the third aspect or the third aspect or the third aspect
The implementation that the second is possible, in the third possible implementation of the third aspect, described
Device also includes that the 3rd determines module, and the described 3rd determines that module is at described same snap
In time delay power spectrum data, when time delay is distinguished two multipaths of difference predeterminable range, according to
Power peak institute in the preset range found in the time delay power spectrum data of same snap
Corresponding time delay point, determines that the footpath number of the required estimation of the time delay point corresponding to described power peak is
Predetermined number.
A fourth aspect of the present invention provides a kind of device assessing dissemination channel environment, described device bag
Include: first determines that module, parameter estimation module and statistical result obtain module；Described first true
Cover half block is for according to the preset range found in the time delay power spectrum data of same snap
The interior point of the time delay corresponding to power peak, determines the required footpath number estimated of described snap, and will
The required footpath number estimated of described snap sends to described parameter estimation module；Parameter estimation module is used
The footpath number estimated required for the described snap that module sends is determined, according to described in receiving described first
The required footpath number estimated of fixed described snap, utilize channel parameter estimation algorithm to described soon
The each footpath taken in the footpath number of required estimation carries out channel parameter estimation, until estimating to obtain letter
The channel parameter in each footpath of all snaps in road, and it is described to obtain module transmission to described statistical result
Estimate the channel parameter in each footpath of all snaps of channel obtained；Statistical result obtains module and is used for
Receive each footpath of all snaps of channel of the described estimation acquisition that described parameter estimation module sends
Channel parameter, the channel parameter in each footpath of all snaps of described acquisition is added up, obtains
Obtain the statistical result of described channel, to assess the communication environments of described channel.
The invention has the beneficial effects as follows: be different from the situation of prior art, the present invention is according to same
The point of the time delay corresponding to power peak found in the time delay power spectrum data of individual snap, when determining
Prolong a little required footpath number estimated, so that it is determined that the required footpath number estimated of this snap, this determine
Snap needs the mode of the footpath number estimated, can according to the concrete data adaptive of each snap really
The fixed footpath number needing to estimate；Utilize channel parameter estimation algorithm that this takes the footpath of required estimation soon
Each footpath in number carries out channel parameter estimation.In this way, it is possible to each snap is arranged
Suitably footpath number, thus improve accuracy and the convergence rate of channel parameter estimation.
Accompanying drawing explanation
Fig. 1 is the flow chart of channel parameter estimation method one embodiment of the present invention；
Fig. 2 is the time delay power spectrum of certain snap in channel；
Fig. 3 is the flow chart of channel parameter estimation method one embodiment of the present invention；
Fig. 4 is the flow chart of the another embodiment of channel parameter estimation method of the present invention；
Fig. 5 is the flow chart that the present invention assesses method one embodiment of dissemination channel environment；
Fig. 6 is the structural representation of channel parameter estimation device one embodiment of the present invention；
Fig. 7 is the structural representation of channel parameter estimation another embodiment of device of the present invention；
Fig. 8 is the structural representation of the another embodiment of channel parameter estimation device of the present invention；
Fig. 9 is the structural representation that the present invention assesses device one embodiment of dissemination channel environment；
Figure 10 is the structural representation of the another embodiment of channel parameter estimation device of the present invention.
Detailed description of the invention
The present invention will be described in detail with embodiment below in conjunction with the accompanying drawings.
It is the flow chart of channel parameter estimation method one embodiment of the present invention refering to Fig. 1, Fig. 1,
Including:
Step S101: according to the default model found in the time delay power spectrum data of same snap
Enclose the time delay point corresponding to interior power peak, determine the required footpath number estimated of this snap.
Snap is the unit of the piecewise analysis of measured data in time domain.In same snap, letter
The characteristic parameter in road is consistent, the state of channel impulse response held stationary.In wireless channel, many
Footpath refers to that radio signal arrives at the propagation phenomenon of reception antenna, example from transmitting antenna through multiple paths
Such as atmosphere to the scattering of electric wave, ionosphere to the reflection of electric wave and refraction, and the chain of mountains, building
On earth's surface object, the reflection of electric wave all can be caused multipath transmisstion.Multipath effect refers to that radio wave propagation is believed
The interference delay effect caused by Multipath Transmission phenomenon in road.
Time delay refer to a message or packet from required for one end of network is sent to the other end time
Between.In actual radio propagation channel, often there is the transmission path that many time delays are different.Respectively
Bar propagation path can change over, participate in interfere each component fields between mutual relation the most just with
Time and change, thus cause the change at random of wave field synthesis, thus form declining of total received field
Fall.
Due to the multipath of mobile telecommunication channel, the motion of mobile station and different scattering environments so that
Mobile channel in time, cause dispersion in frequency and in angle, time delay power spectrum (PDP,
Power Delay Profile) for describing channel dispersion in time, power is i.e. described with time delay
Variation relation, refer to the time delay power spectrum that Fig. 2, Fig. 2 are certain snaps in channel.
In preset range, find the power peak in the time delay power spectrum data of same snap,
Such that it is able to find the time delay point corresponding to this power peak, determine that each time delay point is required and estimate
Footpath number, such that it is able to further determine that the required footpath number estimated of snap, i.e. estimate required for snap
The footpath number of meter is equal to the required footpath number sum estimated of each time delay point.
Wherein, preset range includes but not limited to preset time delay range or predetermined power scope.Such as,
Default time delay range is given, then in can finding this time delay range preset in time delay power spectrum
Time delay point corresponding to power peak；In time delay power spectrum, provide default power bracket, then may be used
To find the time delay point corresponding to this power bracket internal power peak value preset.
As in figure 2 it is shown, there are six power peaks between preset range 0 to 1 microsecond, it is respectively
1 to peak, peak 6, these six power peaks the most corresponding 6 time delays point A, B, C, D, E with
And F, if the required footpath number estimated of each time delay point is 2, then estimate required for this snap
The footpath number of meter is 12；Between preset range-65 to-50 decibel, there are three power peaks, are respectively
Peak 1, peak 2 and peak 3, corresponding time delay point is A, B and C respectively, if each time delay point institute
Needing the footpath number estimated is all 2, then the required footpath number estimated of this snap is 6.
It is said that in general, in preset range time delay point more than one corresponding to this power peak, and
The probability of the vicinity concentrating on maximum power peak is the least, and the required footpath estimated of such snap will not
It is totally absorbed in the vicinity of maximum power peak, the appearance in pseudo-footpath can be greatly reduced, increase channel
The accuracy estimated.
Step S102: according to the footpath number estimated required for this snap fixed, utilize channel parameter
Algorithm for estimating carries out channel parameter estimation to this each footpath taken soon in the footpath number of required estimation,
Until estimating to obtain the channel parameter in each footpath of all snaps of channel.
After determining the footpath number estimated required for snap, can be right according to channel parameter estimation algorithm
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.Channel parameter is estimated
Calculating method includes but not limited to SAGE algorithm, initializes and search for the SAGE algorithm of improvement
(ISIS, Initialization and Searching Improved SAGE) etc..Use above-mentioned channel
Parameter estimation algorithm carries out the channel parameter estimation in each footpath, is prior art, thus the most not
Repeat again.
Channel parameter includes: time delay, angle, Doppler, polarization matrix etc..
According to the method until obtaining the channel parameter in each footpath of all snaps of channel.Each snap
Time delay power spectrum data different, power peak in the preset range that each snap finds institute is right
The time delay point answered is different, and the required footpath number estimated of each snap is also different, because of
This, each snap can be given by embodiment of the present invention suitably estimates footpath number, i.e. can basis
The change of scene, adaptive adjustment is made in the estimation of diameter number.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.By this side
Formula, it is possible to each snap is arranged suitable footpath number, thus improves the accuracy of channel parameter estimation
And convergence rate.
It is the flow chart of another embodiment of channel parameter estimation method of the present invention refering to Fig. 3, Fig. 3,
Including:
Step S201: obtain the same average time delay power spectrum number taking all subchannels soon
According to.
Extract the same channel impulse response data taking all subchannels soon, this is taken soon
The time delay power spectrum data of all subchannels is averaged, and can obtain this and take all subchannels soon
Average time delay power spectrum data.
In actual measurement system, sending and receiving end generally uses multiple antenna, and these antenna is the side with the time-division
Signal is launched and is received in the switching of formula poll, i.e. launches signal at some moment only one of which antenna
One antenna receiving signal, becomes a subchannel.
Such as, 7 reception antennas of transmission antenna 16 during actual measurement channel, same take bag soon
Switch in turn containing No. 3 antennas, then the number of subchannel is 7*16*3=336,336 sons are led to
The time delay power spectrum data in road is added, and then divided by 336, can obtain this and take all sons soon and lead to
The average time delay power spectrum data in road.
Step S202: according to the time delay power spectrum data obtained, it is thus achieved that this peak power taken soon
Or this peak power taken soon and average noise level.
After obtaining this average time delay power spectrum data taking all subchannels soon, can find
This peak power taken soon；If choosing noise region, it is also possible to obtain that this takes soon is average
Noise level.
Such as, as in figure 2 it is shown, choosing noise region is between-80 to-72 decibels, by this region
All performance numbers be added, then divided by the number of data, be this average noise water taken soon
Flat.
Step S203: the peak power taken soon according to this or this peak power taken soon are with average
Noise level, determines predetermined power scope.
Obtain this peak power Pmax taken soon, determine predetermined power scope, such as: preset
Power bracket deducts between 20dB to Pmax at Pmax, or predetermined power scope subtracts at Pmax
Go between 15dB to Pmax etc..
Or, it is thus achieved that this peak power Pmax taken soon and average noise level Pnoise, really
Determine predetermined power scope, such as: predetermined power scope adds between 3dB to Pmax at Pnoise,
Or predetermined power scope at Pnoise plus between 5dB to Pmax etc..
Step S204: search the power peak institute in the range of predetermined power in time delay power spectrum data
Corresponding time delay point.
After determining predetermined power scope, take the average time delay power spectrum of all subchannels soon at this
Data can be searched the point of the time delay corresponding to power peak in the range of this predetermined power.
Above-mentioned steps S201 to step S204 is to look for the time delay point in the range of predetermined power, it is possible to
To search this average time delay power spectrum number taking subchannel soon according to the time delay range preset
According to the time delay point corresponding to middle power peak.Or model can also be preset according to other conditional search
Enclose interior time delay point, no longer go to live in the household of one's in-laws on getting married at this and chat.
Step S205: according to the default model found in the time delay power spectrum data of same snap
Enclose the time delay point corresponding to interior power peak, determine the required footpath number estimated of snap.
In preset range, find the power peak in the time delay power spectrum data of same snap,
Such that it is able to find the time delay point corresponding to this power peak, determine that each time delay point is required and estimate
Footpath number, such that it is able to further determine that the required footpath number estimated of snap, i.e. estimate required for snap
The footpath number of meter is equal to the required footpath number sum estimated of each time delay point.
Wherein, preset range includes but not limited to preset time delay range or predetermined power scope.
Step S206: according to the footpath number estimated required for fixed snap, utilize channel parameter to estimate
Calculating method carries out channel parameter estimation to each footpath in the footpath number taking required estimation soon, until
Estimate to obtain the channel parameter in each footpath of all snaps of channel.
After determining the footpath number estimated required for snap, can be right according to channel parameter estimation algorithm
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.Channel parameter is estimated
Calculating method includes but not limited to SAGE algorithm, initializes and search for the SAGE algorithm of improvement
(ISIS, Initialization and Searching Improved SAGE) etc..Use above-mentioned channel
Parameter estimation algorithm carries out the channel parameter estimation in each footpath, is prior art, thus the most not
Repeat again.
According to the method until obtaining the channel parameter in each footpath of all snaps of channel.Each snap
Time delay power spectrum data different, power peak in the preset range that each snap finds institute is right
The time delay point answered is different, and the required footpath number estimated of each snap is also different, because of
This, each snap can be given by embodiment of the present invention suitably estimates footpath number, i.e. can basis
The change of scene, adaptive adjustment is made in the estimation of diameter number.
In a word, the present invention is according to the power found in the time delay power spectrum data of same snap
Time delay point corresponding to peak value, determines the required footpath number estimated of time delay point, so that it is determined that this snap
The required footpath number estimated, the mode of this footpath number determining snap needs estimation, can be according to often
The determination of the concrete data adaptive of individual snap needs the footpath number estimated；Channel parameter estimation is utilized to calculate
Method carries out channel parameter estimation to this each footpath taken soon in the footpath number of required estimation.By this
The mode of kind, it is possible to each snap is arranged suitable footpath number, thus improves the standard of channel parameter estimation
Exactness and convergence rate.
It is the flow chart of the another embodiment of channel parameter estimation method of the present invention refering to Fig. 4, Fig. 4,
Including:
Step S301: in the time delay power spectrum data of same snap, if distinguish in time delay
Difference predeterminable range two multipaths, then according in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range found, determines corresponding to power peak
The required footpath number estimated of time delay point is predetermined number.
Use different channel measuring device, if difference predeterminable range can be distinguished in time delay
Two multipaths, then according to found in the time delay power spectrum data of same snap preset
In the range of the point of the time delay corresponding to power peak, needed for determining the time delay point corresponding to power peak
Footpath number to be estimated is predetermined number.
In the environment of city macrocell and suburb macrocell, base station location is high, and surrounding compares
Spaciousness, scattering object is less, uses the channel measuring device that bandwidth ratio is bigger, for example with 100M
Channel is measured in the time delay power spectrum data of acquisition by the channel measuring device of bandwidth, in time delay
On can distinguish difference two multipaths of 3 meters, now, the power peak in the preset range found
After time delay point corresponding to value, each time delay point found only need to estimate a footpath, so can in case
The estimation in pseudo-footpath, improves the accuracy that channel is estimated, reduces the time of channel parameter estimation, can
In the channel data of real-time online is analyzed.
Step S302: according to the default model found in the time delay power spectrum data of same snap
Enclose the time delay point corresponding to interior power peak, determine the required footpath number estimated of this snap.
In preset range, find the power peak in the time delay power spectrum data of same snap,
Such that it is able to find the time delay point corresponding to this power peak, each owing to step S301 determining
The required footpath number estimated of time delay point is predetermined quantity, such that it is able to further determine that required for snap
The required footpath number estimated of the footpath number of estimation, i.e. snap is pre-equal to the required estimation of each time delay point
The footpath number sum of determined number.
Wherein, preset range includes but not limited to preset time delay range or predetermined power scope.Such as,
Default time delay range is given, then in can finding this time delay range preset in time delay power spectrum
Time delay point corresponding to power peak；In time delay power spectrum, provide default power bracket, then may be used
To find the time delay point corresponding to this power bracket internal power peak value preset.
It is said that in general, in preset range time delay point more than one corresponding to this power peak, and
The probability of the vicinity concentrating on maximum power peak is the least, and the required footpath estimated of such snap will not
It is totally absorbed in the vicinity of maximum power peak, the appearance in pseudo-footpath can be greatly reduced, increase channel
The accuracy estimated.
Step S303: according to the footpath number estimated required for this snap fixed, utilize channel parameter
Algorithm for estimating carries out channel parameter estimation to this each footpath taken soon in the footpath number of required estimation,
Until estimating to obtain the channel parameter in each footpath of all snaps of channel.
According to the method until obtaining the channel parameter in each footpath of all snaps of channel.Each snap
Time delay power spectrum data different, power peak in the preset range that each snap finds institute is right
The time delay point answered is different, and the required footpath number estimated of each snap is also different, because of
This, each snap can be given by embodiment of the present invention suitably estimates footpath number, i.e. can basis
The change of scene, adaptive adjustment is made in the estimation of diameter number.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.By this side
Formula, it is possible to each snap is arranged suitable footpath number, thus improves the accuracy of channel parameter estimation
And convergence rate.
It is the stream that the present invention assesses method one embodiment of dissemination channel environment refering to Fig. 5, Fig. 5
Cheng Tu, including:
Step S401: according to the default model found in the time delay power spectrum data of same snap
Enclose the time delay point corresponding to interior power peak, determine the required footpath number estimated of snap.
Step S402: according to the footpath number estimated required for fixed snap, utilize channel parameter to estimate
Calculating method carries out channel parameter estimation to each footpath in the footpath number taking required estimation soon, until
Estimate to obtain the channel parameter in each footpath of all snaps of channel.
Step S403: the channel parameter in each footpath estimating all snaps obtained is added up,
Obtain the statistical result of channel, to assess the communication environments of channel.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation, to estimating to obtain
The channel parameter in each footpath of all snaps add up, it is thus achieved that the statistical result of channel, to comment
Estimate the communication environments of channel.In this way, it is possible to each snap is arranged suitable footpath number,
Thus improve accuracy and the convergence rate of channel parameter estimation, and can to the quality of channel and
Communication environments makes correct evaluation.
It is the structural representation of channel parameter estimation device one embodiment of the present invention refering to Fig. 6, Fig. 6
Figure, this device includes: first determines module 101 and parameter estimation module 102.
First determines that module 101 is for according to looking in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range arrived, determines the required estimation of this snap
Footpath number, and the footpath number estimated required for this snap is sent to parameter estimation module 102.
In preset range, find the power peak in the time delay power spectrum data of same snap,
Such that it is able to find the time delay point corresponding to this power peak, determine that each time delay point is required and estimate
Footpath number, such that it is able to further determine that the required footpath number estimated of snap, i.e. estimate required for snap
The footpath number of meter is equal to the required footpath number sum estimated of each time delay point.
Wherein, preset range includes but not limited to preset time delay range or predetermined power scope.Such as,
Default time delay range is given, then in can finding this time delay range preset in time delay power spectrum
Time delay point corresponding to power peak；In time delay power spectrum, provide default power bracket, then may be used
To find the time delay point corresponding to this power bracket internal power peak value preset.
It is said that in general, in preset range time delay point more than one corresponding to this power peak, and
The probability of the vicinity concentrating on maximum power peak is the least, and the required footpath estimated of such snap will not
It is totally absorbed in the vicinity of maximum power peak, the appearance in pseudo-footpath can be greatly reduced, increase channel
The accuracy estimated.
Parameter estimation module 102 determines required for this snap that module 101 sends for receiving first
The footpath number estimated, according to the footpath number estimated required for this snap fixed, utilizes channel parameter to estimate
Calculating method carries out channel parameter estimation, directly to this each footpath taken soon in the footpath number of required estimation
To estimating to obtain the channel parameter in each footpath of all snaps of channel.
According to the method until obtaining the channel parameter in each footpath of all snaps of channel.Each snap
Time delay power spectrum data different, power peak in the preset range that each snap finds institute is right
The time delay point answered is different, and the required footpath number estimated of each snap is also different, because of
This, each snap can be given by embodiment of the present invention suitably estimates footpath number, i.e. can basis
The change of scene, adaptive adjustment is made in the estimation of diameter number.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.By this side
Formula, it is possible to each snap is arranged suitable footpath number, thus improves the accuracy of channel parameter estimation
And convergence rate.
Show refering to the structure that Fig. 7, Fig. 7 are channel parameter estimation another embodiments of device of the present invention
Be intended to, this device includes: acquisition module 201, obtain module 202, second determine module 203,
Search module 204, first determine module 205 and parameter estimation module 206.
Acquisition module 201 is for obtaining the same average time delay power taking all subchannels soon
Modal data, and to obtaining module transmission delay power spectrum data.
Extract the same channel impulse response data taking all subchannels soon, this is taken soon
The time delay power spectrum data of all subchannels is averaged, and can obtain this and take all subchannels soon
Average time delay power spectrum data.
Obtain module 202 to be used for receiving the time delay power spectrum data that acquisition module 201 sends, according to
The time delay power spectrum data obtained, it is thus achieved that the peak power taken soon or the peak power taken soon and
Average noise level, and determine that module 203 sends the peak power taken soon or takes soon to second
Peak power and average noise level.
After obtaining this average time delay power spectrum data taking all subchannels soon, can find
This peak power taken soon；If choosing noise region, it is also possible to obtain that this takes soon is average
Noise level.
Second determines that module 203 obtains, for receiving, the peak power taken soon that module 202 sends
Or the peak power that takes soon and average noise level, according to the peak power taken soon or take soon
Peak power and average noise level, determine predetermined power scope, and to searching module 204
Send predetermined power scope.
Obtain this peak power Pmax taken soon, determine predetermined power scope, such as: preset
Power bracket deducts between 20dB to Pmax at Pmax, or predetermined power scope subtracts at Pmax
Go between 15dB to Pmax etc..
Or, it is thus achieved that this peak power Pmax taken soon and average noise level Pnoise, really
Determine predetermined power scope, such as: predetermined power scope adds between 3dB to Pmax at Pnoise,
Or predetermined power scope at Pnoise plus between 5dB to Pmax etc..
Search module 204 and determine, for receiving second, the predetermined power scope that module 203 sends,
Time delay power spectrum data is searched the point of the time delay corresponding to power peak in the range of predetermined power.
Above-mentioned module is to look for the time delay point in the range of predetermined power, it is also possible to according to default time delay
Range-based searching this to take power peak institute in the average time delay power spectrum data of subchannel soon right
The time delay point answered.Or can also according to the time delay point in other conditional search preset range,
This no longer goes to live in the household of one's in-laws on getting married and chats.
First determines that module 205 is for according to looking in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range arrived, determines the required estimation of this snap
Footpath number, and the footpath number estimated required for this snap is sent to parameter estimation module 206.
In preset range, find the power peak in the time delay power spectrum data of same snap,
Such that it is able to find the time delay point corresponding to this power peak, determine that each time delay point is required and estimate
Footpath number, such that it is able to further determine that the required footpath number estimated of snap, i.e. estimate required for snap
The footpath number of meter is equal to the required footpath number sum estimated of each time delay point.
Wherein, preset range includes but not limited to preset time delay range or predetermined power scope.
Parameter estimation module 206 determines required for this snap that module 205 sends for receiving first
The footpath number estimated, according to the footpath number estimated required for this snap fixed, utilizes channel parameter to estimate
Calculating method carries out channel parameter estimation, directly to this each footpath taken soon in the footpath number of required estimation
To estimating to obtain the channel parameter in each footpath of all snaps of channel.
After determining the footpath number estimated required for snap, can be right according to channel parameter estimation algorithm
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.Channel parameter is estimated
Calculating method includes but not limited to SAGE algorithm, initializes and search for the SAGE algorithm of improvement
(ISIS, Initialization and Searching Improved SAGE) etc..Use above-mentioned channel
Parameter estimation algorithm carries out the channel parameter estimation in each footpath, is prior art, thus the most not
Repeat again.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.By this side
Formula, it is possible to each snap is arranged suitable footpath number, thus improves the accuracy of channel parameter estimation
And convergence rate.
Show refering to the structure that Fig. 8, Fig. 8 are the another embodiments of channel parameter estimation device of the present invention
Being intended to, this device includes: the 3rd determines module 301, first determine that module 302 and parameter are estimated
Meter module 303.
3rd determine module 301 in the time delay power spectrum data of same snap, in time delay
On distinguish difference predeterminable range two multipaths time, according to the time delay power spectrum at same snap
Time delay point corresponding to power peak in the preset range found in data, determines power peak
The required footpath number estimated of corresponding time delay point is predetermined number.
Use different channel measuring device, if difference predeterminable range can be distinguished in time delay
Two multipaths, then according to found in the time delay power spectrum data of same snap preset
In the range of the point of the time delay corresponding to power peak, needed for determining the time delay point corresponding to power peak
Footpath number to be estimated is predetermined number.
In the environment of city macrocell and suburb macrocell, base station location is high, and surrounding compares
Spaciousness, scattering object is less, uses the channel measuring device that bandwidth ratio is bigger, for example with 100M
Channel is measured in the time delay power spectrum data of acquisition by the channel measuring device of bandwidth, in time delay
On can distinguish difference two multipaths of 3 meters, now, the power peak in the preset range found
After time delay point corresponding to value, each time delay point found only need to estimate a footpath, so can in case
The estimation in pseudo-footpath, improves the accuracy that channel is estimated, reduces the time of channel parameter estimation, can
In the channel data of real-time online is analyzed.
First determines that module 302 is for according to looking in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range arrived, determines the required estimation of this snap
Footpath number, and the footpath number estimated required for this snap is sent to parameter estimation module 303.
Parameter estimation module 303 determines required for this snap that module 302 sends for receiving first
The footpath number estimated, according to the footpath number estimated required for this snap fixed, utilizes channel parameter to estimate
Calculating method carries out channel parameter estimation, directly to this each footpath taken soon in the footpath number of required estimation
To estimating to obtain the channel parameter in each footpath of all snaps of channel.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.By this side
Formula, it is possible to each snap is arranged suitable footpath number, thus improves the accuracy of channel parameter estimation
And convergence rate.
It is the knot that the present invention assesses device one embodiment of dissemination channel environment refering to Fig. 9, Fig. 9
Structure schematic diagram, this device includes: first determines module 401, parameter estimation module 402 and system
Meter result obtains module 403.
First determines that module 401 is for according to looking in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range arrived, determines the required footpath estimated of snap
Number, and the footpath number estimated required for snap is sent to parameter estimation module 402.
Parameter estimation module 402 is estimated required for reception first determines the snap that module 401 sends
The footpath number of meter, according to the footpath number estimated required for fixed snap, utilizes channel parameter estimation to calculate
Method carries out channel parameter estimation to each footpath in the footpath number taking required estimation soon, until estimating
Obtain the channel parameter in each footpath of all snaps of channel, and obtain module 403 to statistical result
Send the channel parameter in each footpath of all snaps of channel estimating acquisition.
Statistical result obtains the estimation acquisition that module 403 sends for receiving parameter estimation module 402
The channel parameter in each footpath of all snaps of channel, the letter to each footpath of all snaps obtained
Road parameter is added up, it is thus achieved that the statistical result of channel, to assess the communication environments of channel.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation, to estimating to obtain
The channel parameter in each footpath of all snaps add up, it is thus achieved that the statistical result of channel, to comment
Estimate the communication environments of channel.In this way, it is possible to each snap is arranged suitable footpath number,
Thus improve accuracy and the convergence rate of channel parameter estimation, and can to the quality of channel and
Communication environments makes correct evaluation.
It is the structure of the another embodiment of channel parameter estimation device of the present invention refering to Figure 10, Figure 10
Schematic diagram, this device includes processor 601 and the memorizer 602 coupled with this processor 601.
Memorizer 602 storage has the time delay power spectrum data of all snaps in channel, same snap
The point of the time delay corresponding to power peak in the preset range found in lower time delay power spectrum data
Information and channel parameter estimation algorithm routine.
Processor 601 is for pre-according to found in the time delay power spectrum data of same snap
If the time delay point corresponding to the power peak in scope, determine the required footpath number estimated of snap, and
This footpath number is stored in memorizer 602.
Processor 601 is further used for the footpath number estimated required for fixed snap, utilizes
Channel parameter estimation algorithm carries out channel ginseng to each footpath in the footpath number taking required estimation soon
Number is estimated, until estimating to obtain the channel parameter in each footpath of all snaps of channel, and by this channel
Parameter is stored in memorizer 602.
The present invention is according to the power peak found in the time delay power spectrum data of same snap
Corresponding time delay point, determines the required footpath number estimated of time delay point, so that it is determined that needed for this snap
Footpath number to be estimated, this determines that snap needs the mode of footpath number estimated, can according to each soon
The determination of the concrete data adaptive clapped needs the footpath number estimated；Utilize channel parameter estimation algorithm pair
This each footpath taken soon in the footpath number of required estimation carries out channel parameter estimation.By this side
Formula, it is possible to each snap is arranged suitable footpath number, thus improves the accuracy of channel parameter estimation
And convergence rate.
In several embodiments provided by the present invention, it should be understood that disclosed system,
Apparatus and method, can realize by another way.Such as, device described above is implemented
Mode is only schematically, such as, described module or the division of unit, it is only a kind of logic
Function divides, and actual can have other dividing mode when realizing, and the most multiple unit or assembly can
To combine or to be desirably integrated into another system, or some features can be ignored, or does not performs.
Another point, shown or discussed coupling each other or direct-coupling or communication connection can be
By INDIRECT COUPLING or the communication connection of some interfaces, device or unit, can be electrical, machinery
Or other form.
The described unit illustrated as separating component can be or may not be physically separate
, the parts shown as unit can be or may not be physical location, i.e. may be located at
One place, or can also be distributed on multiple NE.Can select according to the actual needs
Select some or all of unit therein to realize the purpose of present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a process
In unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit
Integrated in a unit.Above-mentioned integrated unit both can realize to use the form of hardware, it is possible to
To use the form of SFU software functional unit to realize.
If described integrated unit realizes and as independent product using the form of SFU software functional unit
When product are sold or use, can be stored in a computer read/write memory medium.Based on so
Understanding, part that prior art is contributed by technical scheme the most in other words or
Completely or partially can embodying with the form of software product of this technical scheme of person, this computer
Software product is stored in a storage medium, including some instructions with so that a computer sets
Standby (can be personal computer, server, or the network equipment etc.) or processor (processor)
Perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage is situated between
Matter includes: USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory),
Random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are each
Plant the medium that can store program code.
The foregoing is only embodiments of the present invention, not thereby limit the patent model of the present invention
Enclosing, every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process become
Change, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the present invention's
In scope of patent protection.
Claims (10)
1. a channel parameter estimation method, it is characterised in that including:
According in the preset range found in the time delay power spectrum data of same snap
Time delay point corresponding to power peak, determines the required footpath number estimated of described snap, described soon
Clap the required footpath number estimated equal to the required footpath number sum estimated of each time delay point；
According to the footpath number estimated required for described fixed described snap, channel parameter is utilized to estimate
Calculating method carries out channel parameter to each footpath in the described footpath number taking required estimation soon and estimates
Meter, until estimating to obtain the channel parameter in each footpath of all snaps of channel.
Method the most according to claim 1, it is characterised in that described preset range is pre-
If time delay range or predetermined power scope.
Method the most according to claim 2, it is characterised in that described basis is same
Corresponding to power peak in the preset range found in the time delay power spectrum data of snap
Time delay point, before determining the step of the required footpath number estimated of described snap, including:
Obtain the described same average time delay power spectrum data taking all subchannels soon；
According to obtain described time delay power spectrum data, it is thus achieved that the described peak power taken soon or
The described peak power taken soon and average noise level；
According to the described peak power taken soon or the described peak power taken soon and averagely make an uproar
Sound level, determines described predetermined power scope；
The power peak in the range of described predetermined power is searched in described time delay power spectrum data
Corresponding time delay point.
4. according to the method described in any one of claims 1 to 3, it is characterised in that described
According to the power peak in the preset range found in the time delay power spectrum data of same snap
Time delay point corresponding to value, before determining the step of the required footpath number estimated of described snap, bag
Include:
In the time delay power spectrum data of described same snap, if distinguishing difference in time delay
Two multipaths of predeterminable range, then according to looking in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range arrived, determines that described power peak institute is right
The required footpath number estimated of the time delay point answered is predetermined number.
5. the method assessing dissemination channel environment, it is characterised in that including:
According in the preset range found in the time delay power spectrum data of same snap
Time delay point corresponding to power peak, determines the required footpath number estimated of described snap, described soon
Clap the required footpath number estimated equal to the required footpath number sum estimated of each time delay point；
According to the footpath number estimated required for described fixed described snap, channel parameter is utilized to estimate
Calculating method carries out channel parameter to each footpath in the described footpath number taking required estimation soon and estimates
Meter, until estimating to obtain the channel parameter in each footpath of all snaps of channel；
The channel parameter in each footpath of the described all snaps estimated and obtain is added up, it is thus achieved that
The statistical result of described channel, to assess the communication environments of described channel.
6. a channel parameter estimation device, it is characterised in that described device includes: first is true
Cover half block and parameter estimation module；
Described first determines that module is for according in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range found, needed for determining described snap
Footpath number to be estimated, the required footpath number estimated of described snap is estimated required for each time delay point
The footpath number sum of meter, and by the footpath number estimated required for described snap to described parameter estimation module
Send；
Described parameter estimation module determines, for receiving described first, the described snap that module sends
The required footpath number estimated, according to the footpath number estimated required for described fixed described snap,
Utilize channel parameter estimation algorithm to each footpath in the described footpath number taking required estimation soon
Carry out channel parameter estimation, until estimating to obtain the channel parameter in each footpath of all snaps of channel.
Device the most according to claim 6, it is characterised in that described preset range is pre-
If time delay range or predetermined power scope.
Device the most according to claim 7, it is characterised in that described device also includes:
Acquisition module, obtain module, second determine module and search module；
Described acquisition module described same takes the average of all subchannels soon for obtaining
Time delay power spectrum data, and send described time delay power spectrum data to described acquisition module；
Described acquisition module is for receiving the time delay power spectrum data that described acquisition module sends, root
According to obtain described time delay power spectrum data, it is thus achieved that the described peak power taken soon or described soon
The peak power taken and average noise level, and determine that module transmission is described soon to described second
The peak power taken or the described peak power taken soon and average noise level；
Described second determines that module described takes soon for receive that described acquisition module sends
Peak power or the described peak power taken soon and average noise level, take soon according to described
Peak power or the described peak power taken soon and average noise level, determine described presetting
Power bracket, and send described predetermined power scope to described lookup module；
Described lookup module determines, for receiving described second, the predetermined power scope that module sends,
The power peak institute in the range of described predetermined power is searched right in described time delay power spectrum data
The time delay point answered.
9. according to the device described in any one of claim 6 to 8, it is characterised in that described dress
Putting and also include that the 3rd determines module, the described 3rd determines that module is at described same snap
In time delay power spectrum data, when time delay is distinguished two multipaths of difference predeterminable range, root
According to the power peak in the preset range found in the time delay power spectrum data of same snap
Time delay point corresponding to value, determines the required estimation of the time delay point corresponding to described power peak
Footpath number is predetermined number.
10. the device assessing dissemination channel environment, it is characterised in that described device includes:
First determines that module, parameter estimation module and statistical result obtain module；
Described first determines that module is for according in the time delay power spectrum data of same snap
Time delay point corresponding to power peak in the preset range found, needed for determining described snap
Footpath number to be estimated, the required footpath number estimated of described snap is estimated required for each time delay point
The footpath number sum of meter, and by the footpath number estimated required for described snap to described parameter estimation module
Send；
Parameter estimation module for receive described first determine the described snap that module sends needed for
Footpath number to be estimated, according to the footpath number estimated required for described fixed described snap, utilizes
Each footpath in the described footpath number taking required estimation soon is carried out by channel parameter estimation algorithm
Channel parameter estimation, until estimating to obtain the channel parameter in each footpath of all snaps of channel, and
Obtain module to described statistical result and send each of the described all snaps of channel estimated and obtain
The channel parameter in footpath；
Statistical result obtains module for receiving the described estimation that described parameter estimation module sends
The channel parameter in each footpath of all snaps of channel obtained, to all snaps of described acquisition
The channel parameter in each footpath is added up, it is thus achieved that the statistical result of described channel, described with assessment
The communication environments of channel.
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| CN106980879A (en) * | 2017-04-28 | 2017-07-25 | 厦门大学 | Based on the sea channel parameter estimation method for improving SVMs and Motar transport |
| CN112054972B (en) * | 2020-07-24 | 2022-10-28 | 东南大学 | Dense multipath parameter estimation method using multi-polarization broadband extension array response |
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