CN103491031B - Time domain CIR estimating circuits and method of estimation - Google Patents
Time domain CIR estimating circuits and method of estimation Download PDFInfo
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Abstract
The invention discloses a kind of time domain CIR estimating circuits and method of estimation, wherein, this method includes：Receive the CIR estimation arrays after carrying out modulus computing；CIR estimations array is pre-processed；Pretreated CIR estimations array will be carried out and be sent to time totalizer progress accumulated time.The present invention solves the technical problem for being difficult to ensure that higher signal to noise ratio under fast fading channel in the prior art in incoherent accumulated time, has reached the technique effect for the signal to noise ratio for improving channel.
Description
Technical field
The present invention relates to the communications field, is responded in particular to a kind of time domain channel impulse（Channel Impulse
Response, referred to as CIR）Estimating circuit and method of estimation.
Background technology
At present, Long Term Evolution（Long Time Evaluation, referred to as LTE）Channel in system in receiver time
Impulse response（Channel Impulse Response, referred to as CIR）Method of estimation, mainly by the way of as shown in Figure 1.
Receiver is by the aerial signal received through radio frequency（Radio Frequency, referred to as RF）Module and FFT
（FFT Fast Fourier Transform, referred to as FFT）Module is sent to reference signal（Reference Signal, referred to as
For RS）Extract and the actual storage in l-th of OFDM symbol on descrambling module generation reception antenna 0 and antenna 1（Real
Storage, referred to as RS）Signal collection：{RS(l)}0、{RS(l)}1。
Again by RS signals collection { RS (l) }0、{RS(l)}1It is sent into inverse Fourier transform（Inverse Discrete Fourier
Transform, referred to as IDFT）Module carries out computing respectively, and the result to being obtained after IDFT computings carries out modulus, after modulus
Obtain the time domain CIR estimations of the 1st OFDM symbol：{CIR(l)}0、{CIR(l)}1.It is worth noting that：It is right in this step
IDFT operation result modulus be in order to reality fast fading channel under avoid coherent accumulation caused by performance degradation.
However, in order to improve CIR estimations { CIR (l) }0{ CIR (l) }1Signal to noise ratio, typically tired out using time totalizer
{ CIR (l+) } of product " continuous "0L and { CIR (l+) }1Obtain { CIRave}0{ CIRave}1Give follow-up channel estimation
With smart sign synchronization（Fine Symbol Synchronization, referred to as FSS）Module.
In above-mentioned traditional CIR accumulated time methods, in order to overcome the influence of fast fading channel and to IDFT computing knots
The modulus processing that fruit is carried out, the gain for inevitably leading to this incoherent accumulated time do not reach coherence time cumulative increasing
Benefit；On the other hand, { CIR () } is estimated because fast fading channel can cause the time to be separated by longer CIR0、{CIR(·)}1Between
Correlation it is relatively low, so as to reduce the cumulative gain of incoherent time, cause to be difficult to obtain from prolonged accumulation needed for
SNR gain.
On the other hand, channel estimation module and FSS modules are to input signal：{CIRave}0{ CIRave}1Signal to noise ratio
（Signal Noise Ratio, referred to as SNR）Have higher requirements, so that its performance can be improved to greatest extent, particularly in LTE systems
Occur operation of receiver in this extremely low signal of such as cell edge and interference plus signal to noise ratio in system（Signal to
Interference Noise Ratio, referred to as SINR）Situation in environment, such as：SINR=-10dB.In such case
Under, it is necessary to the longer time accumulation of CIR estimations will can obtain enough SINR gains, however, passing through above-mentioned mode
Just it is difficult to reach required gain.
For it is above-mentioned the problem of, not yet propose effective solution at present.
The content of the invention
The invention provides a kind of time domain CIR estimating circuits and method of estimation, at least to solve rapid fading in the prior art
The technical problem of higher signal to noise ratio is difficult to ensure that under channel in incoherent accumulated time.
According to an aspect of the invention, there is provided a kind of time domain channel impulse response CIR estimating circuits, including：Modulus
Module and time totalizer, in addition to：Related pretreatment module, is connected with modulo block and time totalizer, related pre- place
Reason module is used to estimate that array pre-processes to the CIR by modulo block, and will carry out pretreated CIR estimations array
It is sent to time totalizer and carries out accumulated time.
Preferably, related pretreatment module includes：Peak value searching module and pretreatment module, wherein, peak value searching module,
For the pretreatment coefficient for determining to pre-process CIR estimations array；Pretreatment module, for the pretreatment system according to determination
It is several that CIR estimations array is pre-processed.
Preferably, peak value searching module, for determining that the CIR after modulus processing estimates member maximum in each element in array
Element, the pretreatment coefficient of array is estimated using the maximum element as the CIR.
Preferably, pretreatment module, for estimating that CIR each element in array carries out multiplication fortune with pretreatment coefficient
Calculate, time totalizer is sent to using the result obtained after computing as new CIR estimations array.
Preferably, time totalizer is used to carry out accumulated time according to the new CIR estimation arrays obtained after pretreatment.
According to another aspect of the present invention, there is provided a kind of time domain channel impulse response CIR method of estimation, including：Connect
Take in the estimation arrays of the CIR after row modulus computing；CIR estimations array is pre-processed；Pretreated CIR estimations will be carried out
Array is sent to time totalizer and carries out accumulated time.
Preferably, carrying out pretreatment to CIR estimations array includes：It is determined that the pre- place pre-processed to CIR estimations array
Manage coefficient；CIR estimations array is pre-processed according to the pretreatment coefficient of determination.
Preferably, it is determined that the pretreatment coefficient pre-processed to CIR estimations array includes：After determining modulus processing
Element maximum in each element in CIR estimation arrays；Pretreatment coefficient using the maximum element as CIR estimation arrays.
Preferably, carrying out pretreatment to CIR estimations array according to the pretreatment coefficient of determination includes：Array is estimated to CIR
In each element with pretreatment coefficient carry out multiplying；Using the result obtained after computing as new CIR estimation array hairs
Give time totalizer.
Preferably, after it will carry out pretreated CIR estimations array and be sent to time totalizer progress accumulated time,
The above method also includes：Time totalizer is used to estimate that array carries out accumulated time according to pretreated CIR.
In the present invention, by adding a related pretreatment module between modulo block and time totalizer,
Added up accumulator is re-send to after the advanced row pretreatment of estimation array after modulus, so as to solve in the prior art
The technical problem of higher signal to noise ratio is difficult to ensure that under fast fading channel in incoherent accumulated time, has reached the letter for improving channel
Make an uproar than technique effect.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the circuit diagram according to the time domain CIR estimating circuits of correlation technique；
Fig. 2 is the structural representation of time domain CIR estimating circuits according to embodiments of the present invention；
Fig. 3 is a kind of preferred flow charts of time domain CIR methods of estimation according to embodiments of the present invention；
Fig. 4 is a kind of preferred flow charts of the step of being pre-processed to CIR estimations array according to embodiments of the present invention；
Fig. 5 is that the pretreatment coefficient according to embodiments of the present invention according to determination is pre-processed to CIR estimations array
A kind of preferred flow charts；
Fig. 6 is the circuit diagram of time domain CIR estimating circuits according to embodiments of the present invention；
Fig. 7 is that Conventional temporal according to embodiments of the present invention is accumulated and illustrated using the waveform of the accumulated time of pretreatment
Figure.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
The invention provides a kind of preferable time domain CIR estimating circuits, as shown in Fig. 2 including：Modulo block 202 and when
Between accumulator 204, related pretreatment module 206, be connected with modulo block 202 and time totalizer 204, the correlation pretreatment
Module is used to estimate that array pre-processes to the CIR by modulo block 202, and will carry out pretreated CIR estimative figures
Group is sent to time totalizer 204 and carries out accumulated time.
In the preferred embodiment, by adding a related pretreatment between modulo block and time totalizer
Module, after the advanced row pretreatment of estimation array after by modulus re-sending to accumulator is added up, existing so as to solve
There is the technical problem for being difficult to ensure that higher signal to noise ratio in technology under fast fading channel in incoherent accumulated time, reached raising
The technique effect of the signal to noise ratio of channel.
It is for instance possible to use estimation array of the mode of pretreatment parameter to each channel pre-processes, it is excellent at one
Select in embodiment, related pretreatment module includes：Peak value searching module and pretreatment module, wherein, peak value searching module, use
In it is determined that the pretreatment coefficient pre-processed to CIR estimations array；Pretreatment module, for the pretreatment coefficient according to determination
CIR estimations array is pre-processed.
It can will estimate coefficient of the element as pretreatment of peak value maximum in array, in a preferred embodiment,
Peak value searching module, for determining that the CIR after modulus processing estimates element maximum in each element in array, by the maximum member
Pretreatment coefficient of the element as CIR estimation arrays.
It can be that a coefficient is multiplied by each element in estimation array for above-mentioned pretreatment, will be obtained after multiplication
The result arrived the array new as one carries out accumulating operation, in a preferred embodiment, pretreatment module, for pair
Each element in CIR estimation arrays carries out multiplying with pretreatment coefficient, using the result obtained after computing as new CIR
Estimation array is sent to time totalizer.
Preferably, above-mentioned time totalizer is used to carry out the time according to the new CIR estimation arrays obtained after pretreatment
Accumulation.
Based on above-mentioned time domain CIR estimating circuit, the present embodiment additionally provides a kind of time domain channel impulse response CIR's
Method of estimation, as shown in figure 3, comprising the following steps：
Step S302：Receive the CIR estimation arrays after carrying out modulus computing；
Step S304：CIR estimations array is pre-processed；
Step S306：Pretreated CIR estimations array will be carried out and be sent to time totalizer progress accumulated time.
In the preferred embodiment, by being pre-processed before accumulated time to the estimation array after modulus, so as to
Solve the technical problem for being difficult to ensure that higher signal to noise ratio under fast fading channel in the prior art in incoherent accumulated time, reach
To the technique effect for the signal to noise ratio for improving channel.
Can be carried out by the coefficient of a pretreatment when CIR estimations array is pre-processed, it is excellent at one
Select in embodiment, estimate the step of array pre-processes as shown in figure 4, comprising the following steps CIR：
Step S402：It is determined that the pretreatment coefficient pre-processed to CIR estimations array；
Step S404：CIR estimations array is pre-processed according to the pretreatment coefficient of determination.
The difference of the signal received in view of every antenna, the maximum in estimation array corresponding to the antenna can be used
Element, in a preferred embodiment, it is determined that the pretreatment coefficient pre-processed to CIR estimations array includes：It is determined that ask
Element maximum in each element in CIR estimation arrays after mould processing；Using the maximum element as the pre- of CIR estimation arrays
Processing coefficient.
, can be real by the way of each element in array is multiplied by a predetermined coefficient for above-mentioned pretreatment
It is existing, in a preferred embodiment, CIR estimations array is pre-processed according to the pretreatment coefficient of determination as shown in figure 5,
Comprise the following steps：
Step S502：Estimate that CIR each element in array carries out multiplying with pretreatment coefficient；
Step S502：Time totalizer is sent to using the result obtained after computing as new CIR estimations array.
After above-mentioned steps S306, the above method also includes：Time totalizer is used to be estimated according to pretreated CIR
Array carries out accumulated time.
The embodiment of the present invention additionally provides a kind of preferred embodiment further to be explained to the present invention, but is worth
It is noted that the preferred embodiment is intended merely to the preferably description present invention, does not form and the present invention is improperly limited.
The circuit that a kind of raising LTE receiver time domains CIR estimates incoherent accumulated time is provided in the present embodiment, as
Shown in Fig. 2, compared to the circuit diagram in background technology, in fig. 2, " a correlationization is added before time totalizer
Pretreatment " module（Related pretreatment module i.e., above）, i.e. the result that signal operation obtains is needed in experience correlationization
Handled in time totalizer corresponding to being input to again after pretreatment.
Illustrated by taking the signal on reception antenna 0 as an example, correlationization pretreatment module searches out the 1st OFDM symbol first
In CIR estimation arrays on number { CIR (l) }0Peak value P (l)0：
CIR { l, m } in above formula0Estimate array { CIR (l) } for CIR0In m-th of element, then, by peak value P (l)0Multiply
Return array { CIR (l) }0In first element obtain：
CIR'{l,m}0=P(l)0*CIR{l,m}0
Then, accumulated time is carried out using the CIR estimations after processing：
" correlationization pretreatment " is to array { CIR in Fig. 6ave}0Effect as shown in fig. 7, Fig. 7 " Conventional temporal tires out
In product " method, because the influence of fast fading channel is 5 OFDM symbols 0,4,7,11 in the time domain CIR estimation accumulated time cycles
Estimate peak power with the CIR on 14, and the power of each multipath is all unequal, and now additive white Gaussian noise
（Additive White Gauss ion Noise, referred to as AWGN）Power be it is the same, therefore, " Conventional temporal accumulation "
Method such as can regard as at the gain accumulation, wait gain accumulation theory to understand accumulation results { CIR now by knownave}0SNR
It can not reach maximum.
However, in " accumulation of correlationization processing time " method of the embodiment of the present invention, OFDM symbol 0,4,7,11 and 14
On the CIR estimations peak value element multiplication with each of which symbol respectively, now AWGN compositions be also multiplied and change with its peak value simultaneously
Become, respectively as shown in the second row " correlationization processing time accumulation method " in Fig. 7.Now, due to CIR caused by fast fading channel
Estimate peak power and power unequal AWGN compositions foundation corresponding with its in different OFDM symbols of each multipath
Correlation：High symbol its AWGN of CIR peak powers power is also high, such as：OFDM symbol 14；CIR peak powers are low
Its local AWGN power is also low, such as：OFDM symbol 7.Therefore, caused accumulated time and maximum-ratio combing（MRC）It is similar, by
Known MRC theories know accumulation results { CIR nowave}0SNR be higher than " Conventional temporal accumulation " equal gain combining.This hair
Bright embodiment is directed to the weakness of incoherent accumulated time under fast fading channel, and the incoherent time is improved with relatively low implementation complexity
The SINR gains of accumulation.
In another embodiment, a kind of software is additionally provided, the software is used to perform above-described embodiment and preferred reality
Apply the technical scheme described in mode.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned software is stored with the storage medium, should
Storage medium includes but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
As can be seen from the above description, the present invention realizes following technique effect：By in modulo block and time
A related pretreatment module is added between accumulator, is retransmited after the advanced row pretreatment of estimation array after by modulus
Added up to accumulator, so as to solve be difficult to ensure that under fast fading channel in the prior art in incoherent accumulated time it is higher
Signal to noise ratio technical problem, reached the technique effect for the signal to noise ratio for improving channel.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein
The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (4)
1. a kind of time domain channel impulse responds CIR estimating circuits, including：Modulo block and time totalizer, it is characterised in that also
Including：
Related pretreatment module, it is connected with the modulo block and the time totalizer, the related pretreatment module is used
Pre-processed in the CIR estimations array by the modulo block, and pretreated CIR estimations array will be carried out and sent
Accumulated time is carried out to the time totalizer；
The related pretreatment module includes：Peak value searching module and pretreatment module, wherein,
The peak value searching module, for determining that the CIR after modulus processing estimates element maximum in each element in array,
Pretreatment coefficient using the maximum element as CIR estimation arrays；
The pretreatment module, for estimating that the CIR each element in array carries out multiplication with the pretreatment coefficient
Computing, the time totalizer is sent to using the result obtained after computing as new CIR estimations array.
2. according to the circuit described in claim 1, it is characterised in that the time totalizer is used for according to being obtained after pretreatment
New CIR estimations array carry out accumulated time.
A kind of 3. time domain channel impulse response CIR method of estimation, it is characterised in that including：
Receive the CIR estimation arrays after carrying out modulus computing；
Determine element maximum in each element in the CIR estimation arrays after modulus processing；
Pretreatment coefficient using the maximum element as CIR estimation arrays；
Estimate that the CIR each element in array carries out multiplying with the pretreatment coefficient；
Time totalizer is sent to using the result obtained after computing as new CIR estimations array.
4. according to the method described in claim 3, it is characterised in that sent pretreated CIR estimations array will be carried out
After carrying out accumulated time to time totalizer, methods described also includes：
The time totalizer is used to estimate that array carries out accumulated time according to pretreated CIR.
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| CN101335725A (en) * | 2007-06-25 | 2008-12-31 | 中兴通讯股份有限公司 | Method and system for unit impact response estimation of channel |
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