CN105119666B - The method that adaptive combined channel estimates channel quality - Google Patents
The method that adaptive combined channel estimates channel quality Download PDFInfo
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- CN105119666B CN105119666B CN201510410397.6A CN201510410397A CN105119666B CN 105119666 B CN105119666 B CN 105119666B CN 201510410397 A CN201510410397 A CN 201510410397A CN 105119666 B CN105119666 B CN 105119666B
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Abstract
The method that adaptive combined channel proposed by the present invention estimates channel quality, it is desirable to provide it is a kind of more comprehensively, method more accurate, that transmission link decay and the characteristic of channel can be reflected simultaneously, the technical scheme is that：The reception signal influenceed by transmission link amplitude versus frequency characte, phase-frequency characteristic, group delay is demodulated by demodulation module first, giving signal-to-noise ratio (SNR) estimation module demodulation result carries out signal-to-noise ratio (SNR) estimation；A power estimation is carried out by the power estimation module docking collection of letters number simultaneously, giving signal-to-noise ratio computation module together power estimated result and current operating state carries out signal-to-noise ratio computation；The signal-to-noise ratio (SNR) estimation result obtained by demodulation module demodulating data and obtained signal-to-noise ratio computation result is calculated by signal-to-noise ratio computation module and gives Combined estimator module together, Combined estimator module is analyzed the signal-to-noise ratio (SNR) estimation result obtained from above-mentioned two different paths, judges output transmission link channel quality estimation result.
Description
Technical field
It is applied to the method estimated transmission channel quality during Adaptive Transmission the present invention relates to a kind of, mainly
For carrying out adaptive combined estimation to transmission channel situation during Adaptive Transmission.
Background technology
Bandwidth and power are two topmost limiting factors in radio communication, are on the one hand wished as far as possible using limited
Bandwidth resources, improve the channel capacity of system；On the other hand wish to transmit more information under lower transmission power.Tradition
Communication plan transmission of the signal in space link is completed using fixed modulation and coded system.Using fixed coding and
Modulation system generally requires reserved more system margin, can enter to ensure to decline in rain, under the severe link condition such as multipath
Row normal transmission.These power headroom are that occasional is used, and the most of the time will be idle, and cause system resource seriously unrestrained
Take.Data can more efficiently be transmitted using Adaptive Transmission system, limited bandwidth and power resource is fully used.
Adaptive Transmission can adjust transmission means in real time according to channel quality：When channel quality is bad by reduce order of modulation and
Transmission quality is ensured using modes such as the bigger codings of coding gain；When channel quality is preferable by improve order of modulation and
Transmission rate is improved using modes such as the higher encoder bit rates of code check.During Adaptive Transmission, to transmission channel quality
Estimation be select transmission means important evidence, transmission quality and efficiency of transmission are played an important role.It is adaptive at present
The channel quality estimation method that transmitting procedure is used only is estimated the link attenuation in transmitting procedure mostly, to transmission link
The influence collected mail number of the factor such as amplitude versus frequency characte, phase-frequency characteristic, group delay docking consider inadequate, cause in Adaptive Transmission process
In be difficult to select optimal transmission means, influence efficiency of transmission.Therefore, the situation for how more fully reacting transmission link is to carry
The key factor of high Adaptive Transmission mode communication efficiency.
The content of the invention
The purpose of the present invention be for estimation of the prior art to transmission channel quality it is not comprehensive enough the problem of there is provided one kind
More comprehensively, estimation is more accurate, can reflect simultaneously transmission link decay and the characteristic of channel method, can to fading channel and
The method that the characteristic of channel is estimated simultaneously, particularly solves to estimate channel quality in real time during satellite communication Adaptive Transmission
The method of meter.
The above-mentioned purpose of the present invention can be achieved through the following technical solutions, and a kind of adaptive combined channel estimates channel
The method of quality, it is characterised in that comprise the following steps：In receiver transmission link signal receiving end, demodulation module and work(are set
Rate estimation module, and demodulation module and power estimation module output end set respectively series connection Combined estimator module signal to noise ratio
Estimation module and signal-to-noise ratio computation module；Receiver receives signal and is transfused to demodulation module and power estimation module respectively, wherein,
The demodulation module docking collection of letters number is demodulated, and giving signal-to-noise ratio (SNR) estimation module data demodulation result carries out signal-to-noise ratio (SNR) estimation；Work(
The docking collection of letters number of rate estimation module carries out a power estimation, and signal to noise ratio meter is given together power estimated result and current operating state
Calculate module and carry out signal-to-noise ratio computation；Signal-to-noise ratio (SNR) estimation result and calculated by signal-to-noise ratio computation module that signal-to-noise ratio (SNR) estimation module is obtained
Obtained signal-to-noise ratio computation result gives Combined estimator module together, and Combined estimator module from above-mentioned two different paths to obtaining
To signal to noise ratio analyzed, judge output transmission link channel quality estimation result.
The present invention has the advantages that compared to prior art：
The present invention can only be estimated link attenuation for existing quality of wireless channel method of estimation, it is impossible to chain
The deficiency that the influence of the factors such as amplitude, phase, group delay in road is estimated, by the signal to noise ratio for demodulation being followed by the collection of letters number
Estimated result is contrasted with calculating obtained signal-to-noise ratio computation result from receiving power, is solved in conventional transmission channel estimation
The problem of being estimated just for link attenuation.So as to more fully reflect the situation of transmission channel, so that preferably to be adaptive
The switching of transmission state in transmitting procedure is answered to provide foundation.
The power that the present invention docks the collection of letters number by power estimation module is estimated, power estimated result and current work
Make state and give signal-to-noise ratio computation module progress signal-to-noise ratio computation together；Finally the signal-to-noise ratio (SNR) estimation knot obtained by demodulating data
Fruit and the signal-to-noise ratio computation result obtained by received signal power calculating give Combined estimator module, Combined estimator module pair together
The signal to noise ratio that two kinds of distinct methods are obtained is analyzed, and obtains final channel quality estimation result.With art methods phase
Than the decay of transmission link can not only be reflected, additionally it is possible to the amplitude versus frequency characte in transmission link, phase-frequency characteristic, group delay etc.
The influence of factor is estimated, and more fully reflects the situation of transmission link.Combined estimator module is sentenced to transmission link situation
It is disconnected, important evidence can be provided for the selection of transmission means.
The present invention is especially suitable for the quality of transmission link is estimated in wireless broadband communication.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the theory diagram of adaptive combined channel quality estimation process of the present invention.
Embodiment
Refering to Fig. 1.In preferred embodiment described below, according to the present invention, in receiver transmission link letter
Number receiving terminal sets demodulation module and power estimation module, and is set respectively in the output end of demodulation module and power estimation module
The signal-to-noise ratio (SNR) estimation module and signal-to-noise ratio computation module for Combined estimator module of connecting；It is special by transmission link amplitude versus frequency characte, phase frequency
Property, group delay influence reception signal pass through demodulation module and power estimation module respectively.The demodulation module docking collection of letters number is carried out
After demodulation, give noise power estimation module demodulation result and carry out signal-to-noise ratio (SNR) estimation.The power estimation module docking collection of letters number is entered
Row power is estimated, and the result and current operating state that power is estimated give signal-to-noise ratio computation module and carry out signal to noise ratio meter together
Calculate.Finally, the signal-to-noise ratio (SNR) estimation result obtained by signal-to-noise ratio (SNR) estimation module and the signal to noise ratio obtained by signal-to-noise ratio computation module
Result of calculation gives Combined estimator module together, and the signal to noise ratio that Combined estimator module is obtained to two kinds of distinct methods is analyzed,
Final channel quality estimation result is obtained, and channel quality estimation result is exported.Wherein, signal-to-noise ratio (SNR) estimation result is to connect
Estimate what is obtained according to the progress of demodulation module demodulation result after the locking of receipts machine.The power of the signal-to-noise ratio (SNR) estimation module docking collection of letters number is estimated
Meter is carried out before demodulation.Signal-to-noise ratio computation module signal-to-noise ratio computation result is joined according to power estimated result and work at present
Number carries out calculating what is obtained.The estimation of signal-to-noise ratio (SNR) estimation module channel quality is signal-to-noise ratio computation module signal-to-noise ratio (SNR) estimation result
It is compared with signal-to-noise ratio computation result, channel quality is determined according to difference therebetween.If signal-to-noise ratio (SNR) estimation mould
The signal-to-noise ratio (SNR) estimation result of block is consistent with the signal-to-noise ratio computation result of signal-to-noise ratio computation module, then illustrates that the characteristic of channel is good
Good, the principal element of influence transmission quality is link attenuation；If signal-to-noise ratio (SNR) estimation module signal-to-noise ratio (SNR) estimation result and signal to noise ratio
The signal-to-noise ratio computation result difference of computing module is larger, then the factor of explanation influence transmission quality includes link attenuation and poor
The aspect of link property two.
Claims (5)
1. a kind of method that adaptive combined channel estimates channel quality, it is characterised in that comprise the following steps：Passed in receiver
Transmission link signal receiving end sets demodulation module and power estimation module, and in demodulation module and the output end of power estimation module
The signal-to-noise ratio (SNR) estimation module and signal-to-noise ratio computation module of series connection Combined estimator module are set respectively；Receiver receive signal respectively by
Demodulation module and power estimation module are inputted, demodulation module, signal-to-noise ratio (SNR) estimation module produce the signal power in signal to noise ratio, in letter
Obtained before number demodulation, demodulation module docking, which is collected mail, number to be demodulated, and giving signal-to-noise ratio (SNR) estimation module data demodulation result is carried out
Signal-to-noise ratio (SNR) estimation；The power estimation module docking collection of letters number carries out a power estimation, power estimated result and current operating state one
Rise and give signal-to-noise ratio computation module progress signal-to-noise ratio computation, Combined estimator module is signal-to-noise ratio (SNR) estimation module signal-to-noise ratio (SNR) estimation result
It is compared with signal-to-noise ratio computation result, channel quality is determined according to difference between the two；Signal-to-noise ratio (SNR) estimation module is obtained
Signal-to-noise ratio (SNR) estimation result and obtained signal-to-noise ratio computation result calculated by signal-to-noise ratio computation module give Combined estimator mould together
Block, Combined estimator module is analyzed the signal to noise ratio obtained from two different paths, judges output transmission link channel matter
Measure estimated result.
2. the method that the adaptive combined channel as described in claim 1 estimates channel quality, it is characterised in that signal-to-noise ratio (SNR) estimation
Result is estimated after receiver locking according to demodulation module demodulation result.
3. the method that the adaptive combined channel as described in claim 1 estimates channel quality, it is characterised in that signal-to-noise ratio computation
Module signal-to-noise ratio computation result is calculated according to power estimated result and current operating parameters.
4. the method that the adaptive combined channel as described in claim 1 estimates channel quality, it is characterised in that signal-to-noise ratio (SNR) estimation
Estimation of the module to channel quality, is that signal-to-noise ratio computation module signal-to-noise ratio (SNR) estimation result and signal-to-noise ratio computation result are compared
Compared with determining channel quality according to difference therebetween.
5. the method that the adaptive combined channel as described in claim 1 estimates channel quality, it is characterised in that：If signal to noise ratio
The signal-to-noise ratio (SNR) estimation result of estimation module is consistent with the signal-to-noise ratio computation result of signal-to-noise ratio computation module, then the characteristic of channel is good
It is good；If the signal-to-noise ratio computation result difference of signal-to-noise ratio (SNR) estimation module signal-to-noise ratio (SNR) estimation result and signal-to-noise ratio computation module is larger,
Then the factor of influence transmission quality includes link attenuation and the poor aspect of link property two.
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| CN105871506B (en) * | 2016-03-23 | 2019-01-11 | 中国电子科技集团公司第十研究所 | Wirelessly communicate adaptive transmission method |
| US9960866B1 (en) * | 2016-10-28 | 2018-05-01 | Samsung Electronics Co., Ltd | Method and apparatus for signal-to-noise ratio (SNR) estimation |
| CN107508774B (en) * | 2017-08-21 | 2020-11-03 | 安徽师范大学 | Millimeter wave MIMO channel estimation method combining channel representation and beam design |
| CN107911323A (en) * | 2017-11-03 | 2018-04-13 | 西安电子科技大学 | The joint frequency phase method of estimation closed based on partly decoupled |
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| CN102932110A (en) * | 2012-11-23 | 2013-02-13 | 哈尔滨工业大学 | Conjoint method for AMC and adaptive threshold adjustment |
| US20130336432A1 (en) * | 2012-06-19 | 2013-12-19 | General Dynamics C4 Systems, Inc. | Methods and systems for processing a digital signal by estimating signal energy and noise power density |
| US20140348328A1 (en) * | 2013-05-22 | 2014-11-27 | Texas Instruments Incorporated | Signal quality estimation and control |
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| US20050282500A1 (en) * | 2004-06-16 | 2005-12-22 | Wang Yi-Pin E | Benign interference suppression for received signal quality estimation |
| CN1960200A (en) * | 2005-11-01 | 2007-05-09 | 凌阳科技股份有限公司 | Diversity receiver |
| CN101499818A (en) * | 2008-02-03 | 2009-08-05 | 中兴通讯股份有限公司 | Signal-to-noise ratio estimating method in mobile communication system and system thereof |
| US20130336432A1 (en) * | 2012-06-19 | 2013-12-19 | General Dynamics C4 Systems, Inc. | Methods and systems for processing a digital signal by estimating signal energy and noise power density |
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| US20140348328A1 (en) * | 2013-05-22 | 2014-11-27 | Texas Instruments Incorporated | Signal quality estimation and control |
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