CN102347920A - Enhanced channel estimation method and device - Google Patents
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Abstract
本发明公开了一种增强的信道估计方法及装置，此方法包括：根据接收到的公共导频信道符号计算得到非实时信道估计值；计算此非实时信道估计值与历史非实时信道估计值的偏差值，或者计算当前公共导频信道符号值与历史公共导频信道符号值的偏差值；将所述非实时信道估计值与所述偏差值进行加权求和计算得到实时信道估计值。本发明在计算实时信道的估计值时，参考了非实时信道估计值的历史值或者公共导频信道符号的历史值，从而提高了实时信道估计的准确性，有效改善了信道的解调性能，并且对硬件资源的消耗较小，实现简单。
The invention discloses an enhanced channel estimation method and device. The method includes: calculating a non-real-time channel estimation value according to received common pilot channel symbols; calculating the non-real-time channel estimation value and the historical non-real-time channel estimation value deviation value, or calculate the deviation value between the current common pilot channel symbol value and the historical common pilot channel symbol value; perform weighted summation on the non-real-time channel estimation value and the deviation value to obtain the real-time channel estimation value. When calculating the estimated value of the real-time channel, the present invention refers to the historical value of the non-real-time channel estimated value or the historical value of the common pilot channel symbol, thereby improving the accuracy of the real-time channel estimation and effectively improving the demodulation performance of the channel. Moreover, the consumption of hardware resources is small, and the implementation is simple.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of channel estimation methods and device of enhancing.
Background technology
In WCDMA (Wideband Code Division Multiple Access is called for short WCDMA) communication system, CPICH Common Pilot Channel (Common Pilot Channel is called for short CPICH) is commonly used to do channel estimating for other channels.The effect of channel estimation technique in the downlink data receiving course is very important, and the precision of its estimation directly influences the performance of portable terminal receiver.In order to eliminate influences such as noise effectively, portable terminal adopts filtered CPICH symbol as channel estimation value usually.
Existing channel estimation methods comprises finite impulse response (FIR) filtering (average like frequency pilot sign) method, finite impulse response (IIR) filtering method, adaptive filter method etc.Filter commonly used is divided into causal filter and non-causal filter.In order to obtain preferable performance; The non real-time channel is Dedicated Physical Data Channel (Dedicated Physical Data CHannel for example; Abbreviation DPDCH) channel estimating is generally selected non-causal filter for use, and it has also utilized current time CPICH symbol afterwards except utilizing current time and current time CPICH symbol before; But need the data symbol of buffer memory current time like this, thereby cause the time-delay of demodulation.For Real-time Channel promptly to the demanding channel of real-time Dedicated Physical Control Channel (Dedicated Physical Control CHannel for example; Be called for short DPCCH); Related protocol is handled sequential to it and has been made strict restriction; Be difficult to adopt the channel estimation value of non-causal filter output, utilize nearest non-causal filter output approximate usually, carry out under the situation that low speed moves for the person of holding of portable terminal as channel estimation value; Channel fading changes very slow, and this method is less to the demodulation performance influence of Real-time Channel; The person of holding of portable terminal carries out under the situation of high-speed mobile, and channel fading changes fast, causes Doppler frequency shift to become big, adopts nearest non-causal filter output to be similar to the demodulation performance that influences Real-time Channel that method as channel estimation value will be bigger.
Summary of the invention
Technical problem to be solved by this invention provides a kind of channel estimation methods and device of enhancing, improves the accuracy that Real-time Channel is estimated.
In order to solve the problems of the technologies described above, the invention provides a kind of channel estimation methods of enhancing, comprising: the CPICH Common Pilot Channel sign computation according to receiving obtains the non real-time channel estimation value; Calculate the deviate of this non real-time channel estimation value and historical non real-time channel estimation value, perhaps calculate the deviate of current CPICH Common Pilot Channel value of symbol and historical CPICH Common Pilot Channel value of symbol; Said non real-time channel estimation value and said deviate are carried out weighted sum calculate the Real-time Channel estimated value.
Further, said method can also have following characteristics:
After calculating deviate this deviate is carried out the IIR digital filtering, the deviate that will carry out the processing of IIR digital filtering again is used for the calculating real-time channel estimation value.
Further, said method can also have following characteristics:
According to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
Further, said method can also have following characteristics:
During the calculation deviation value; Discrete time point or CPICH Common Pilot Channel value of symbol that the non real-time channel estimation value is corresponding with historical non real-time channel estimation value differ X discrete time point with the corresponding discrete time point of historical CPICH Common Pilot Channel value of symbol, and X is the integer less than 5.
In order to solve the problems of the technologies described above, the invention provides a kind of channel estimating apparatus of enhancing, said device is arranged in portable terminal; Said channel estimating apparatus comprises non real-time channel estimation module, deviate computing module, Real-time Channel estimation module; The output of said non real-time channel estimation module is connected with the input of said deviate computing module; Said non real-time channel estimation module is used for obtaining the non real-time channel estimation value according to the CPICH Common Pilot Channel sign computation that receives, and exports the non real-time channel estimation value that obtains to said deviate computing module and said Real-time Channel estimation module; Said deviate computing module is used to calculate the deviate of non real-time channel estimation module non real-time channel estimation value of exporting and the historical non real-time channel estimation value of having deposited, and outputs to the Real-time Channel estimation module; Said Real-time Channel estimation module is used for that the deviate that the non real-time channel estimation value and the said deviate computing module of said non real-time channel estimation module output are exported is carried out weighted sum and calculates the Real-time Channel estimated value.
Further, said apparatus can also have following characteristics:
Said device also comprises the filtration module that is connected between said deviate computing module and the said Real-time Channel estimation module; Said filtration module is used for the deviate of said deviate computing module output is carried out inputing to said Real-time Channel estimation module behind the IIR digital filtering.
Further, said apparatus can also have following characteristics:
Said Real-time Channel estimation module; Also be used for according to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
In order to solve the problems of the technologies described above, the invention provides a kind of channel estimating apparatus of enhancing, said device is arranged in portable terminal; Said channel estimating apparatus comprises non real-time channel estimation module, deviate computing module, Real-time Channel estimation module; Said non real-time channel estimation module is used for obtaining the non real-time channel estimation value according to the CPICH Common Pilot Channel sign computation that receives, and exports the non real-time channel estimation value that obtains to said Real-time Channel estimation module; Said deviate computing module is used to calculate the deviate of CPICH Common Pilot Channel value of symbol that receives and the historical CPICH Common Pilot Channel value of symbol of having deposited, and outputs to the Real-time Channel estimation module; Said Real-time Channel estimation module is used for that the deviate that the non real-time channel estimation value and the said deviate computing module of said non real-time channel estimation module output are exported is carried out weighted sum and calculates the Real-time Channel estimated value.
Further, said apparatus can also have following characteristics:
Said device also comprises the filtration module that is connected between said deviate computing module and the said Real-time Channel estimation module; Said filtration module is used for the deviate of said deviate computing module output is carried out inputing to said Real-time Channel estimation module behind the IIR digital filtering.
Further, said apparatus can also have following characteristics:
Said Real-time Channel estimation module; Also be used for according to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
The present invention is when the estimated value of calculating real-time channel; With reference to history value or the history value of CPICH Common Pilot Channel symbol of non real-time channel estimation value; Thereby improved the accuracy that Real-time Channel is estimated; Effectively improved the demodulation performance of channel, and less to the consumption of hardware resource, realize simple.
Description of drawings
Fig. 1 is the composition structural representation of the channel estimating apparatus of enhancing among the embodiment one;
Fig. 2 is the composition structural representation of the channel estimating apparatus of enhancing among the embodiment two;
Fig. 3 is the detailed maps of the composition structure of the channel estimating apparatus of enhancing among the embodiment one;
Fig. 4 is the detailed maps of the composition structure of the channel estimating apparatus of enhancing among the embodiment two;
Fig. 5 is the method flow diagram of the channel estimating apparatus that strengthens among the embodiment.
Embodiment
As shown in Figure 1, the channel estimating apparatus that is arranged in the enhancing of portable terminal among the embodiment one comprises non real-time channel estimation module, deviate computing module, Real-time Channel estimation module.The output of non real-time channel estimation module is connected with the input of said deviate computing module.
Said non real-time channel estimation module is used for obtaining the non real-time channel estimation value according to the CPICH Common Pilot Channel sign computation that receives, and exports the non real-time channel estimation value that obtains to said deviate computing module and said Real-time Channel estimation module.
Said deviate computing module is used to calculate the deviate of non real-time channel estimation module non real-time channel estimation value of exporting and the historical non real-time channel estimation value of having deposited, and outputs to the Real-time Channel estimation module.
Said Real-time Channel estimation module is used for that the deviate of the non real-time channel estimation value of said non real-time channel estimation module output and the output of said deviate computing module is carried out weighted sum and calculates the Real-time Channel estimated value.
As shown in Figure 2, the channel estimating apparatus that is arranged in the enhancing of portable terminal among the embodiment one comprises non real-time channel estimation module, deviate computing module, Real-time Channel estimation module.
Said non real-time channel estimation module is used for obtaining the non real-time channel estimation value according to the CPICH Common Pilot Channel sign computation that receives, and exports the non real-time channel estimation value that obtains to said Real-time Channel estimation module.
Said deviate computing module is used to calculate the deviate of CPICH Common Pilot Channel value of symbol that receives and the historical CPICH Common Pilot Channel value of symbol of having deposited, and outputs to the Real-time Channel estimation module.
Said Real-time Channel estimation module is used for that the deviate of the non real-time channel estimation value of said non real-time channel estimation module output and the output of said deviate computing module is carried out weighted sum and calculates the Real-time Channel estimated value.
Can also comprise the filtration module that is connected between deviate computing module and the Real-time Channel estimation module in the device shown in above-mentioned two embodiment.This filtration module is used for the deviate of deviate computing module output is carried out inputing to the Real-time Channel estimation module behind the IIR digital filtering.The filter function of this filtration module assists in removing noise.
Among above-mentioned two embodiment; Can adopt following method during Real-time Channel estimation module calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
Specific embodiment one:
Channel estimating apparatus is as shown in Figure 3 in the specific embodiment one of embodiment one correspondence, and channel estimation methods comprises following content:
One, obtains current C PICH symbol
Obtaining CPICH symbol that current CPICH symbol comprises each footpath of reception, is after accomplishing the descrambling and de-spreading of CPICH channel via the descrambling and de-spreading module, and the symbol separation module carries out the CPICH symbol after the separating treatment to the frequency pilot sign of CPICH.
Two, non real-time channel estimating
When carrying out channel estimating to the CPICH symbol that receives, adopts the non real-time channel estimation module filtering method commonly used, for example a plurality of frequency pilot sign moving average methods.If the current CPICH symbol that receives is for being expressed as x (n), then non real-time channel estimating output y (n-1) be x (n), x (n-1), x (n-2) and x's (n-3) and mean value.Be that the output of non real-time channel estimating meets the following formula description:
The symbolic number that adds up of N in the formula, value can be 4 or 8.This non real-time channel estimation module adopts non-causal filter, has used the input of following CPICH symbol as the non real-time filter, and the offset data that the channel estimation value of current output is corresponding will be time-delay N/2-1 and handle.
Three, prediction non real-time channel estimation bias value
To utilize the nearest approximate deviation that causes channel estimating as channel estimation value of non-causal filter output in order overcoming, to use current non real-time channel estimation value and historical non real-time channel estimation value to dope non real-time channel estimation bias value here.If not the Real-time Channel estimated value is output as y (n-1), then is used for Real-time Channel this moment and estimates to predict that the deviate calculating that obtains is as follows:
δ(n)＝y(n-1)-y(n-3)
δ
f(n)＝(1-α)·δ
f(n-1)+α·δ(n)
In order to reduce the influence of noise jamming, adopted the first order IIR filtering device to carry out Filtering Processing here.α is the iir filter coefficient in the formula, generally can value 1/4, and can add computing by displacement and realize.
Four, Real-time Channel is estimated
The non real-time channel of current output output y (n-1) and prediction deviation offset are carried out estimated value
that weighted sum just obtains Real-time Channel promptly
β is the compensating factor of Real-time Channel output in the formula, and this compensating factor is one to be less than or equal to 1 non-zero real, generally can value 1/2 or 5/8.
Specific embodiment two:
Channel estimating apparatus is as shown in Figure 4 in the specific embodiment two of embodiment two correspondences, and channel estimation methods comprises following content:
First promptly obtains in content and the specific embodiment one that current C PICH symbol and second portion are the non real-time channel estimating identical.
Three, prediction non real-time channel estimation bias value
If the current CPICH symbol that obtains is x (n), the CPICH deviate that then calculates is:
δ(n)＝x(n)-x(n-2)
δ
f(n)＝(1-α)·δ
f(n-1)+α·δ(n)
Here adopted the first order IIR filtering device to carry out Filtering Processing equally.α is the iir filter coefficient, generally can value 1/4.
Four, Real-time Channel is estimated
The estimated value of Real-time Channel can be carried out weighting summation with non real-time filter output this moment by CPICH symbol deviate and obtained, and calculates as follows:
β is the compensating factor of Real-time Channel output in the formula, and this compensating factor is one to be less than or equal to 1 non-zero real, generally can value 1/2 or 5/8.
As shown in Figure 5, corresponding to said apparatus, the channel estimation methods of enhancing comprises: the CPICH Common Pilot Channel sign computation according to receiving obtains the non real-time channel estimation value; Calculate the deviate of this non real-time channel estimation value and historical non real-time channel estimation value, perhaps calculate the deviate of current CPICH Common Pilot Channel value of symbol and historical CPICH Common Pilot Channel value of symbol; Said non real-time channel estimation value and said deviate are carried out weighted sum calculate the Real-time Channel estimated value.
After calculating deviate this deviate is carried out the IIR digital filtering, the deviate that will carry out the processing of IIR digital filtering again is used for the calculating real-time channel estimation value.
According to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
During the calculation deviation value; Discrete time point or CPICH Common Pilot Channel value of symbol that the non real-time channel estimation value is corresponding with historical non real-time channel estimation value differ X discrete time point with the corresponding discrete time point of historical CPICH Common Pilot Channel value of symbol, and X is the integer less than 5.
The present invention with reference to history value or the history value of CPICH Common Pilot Channel symbol of non real-time channel estimation value, thereby has improved the accuracy that Real-time Channel is estimated when the estimated value of calculating real-time channel, effectively improved the demodulation performance of channel.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. the channel estimation methods of an enhancing is characterized in that,
CPICH Common Pilot Channel sign computation according to receiving obtains the non real-time channel estimation value; Calculate the deviate of this non real-time channel estimation value and historical non real-time channel estimation value, perhaps calculate the deviate of current CPICH Common Pilot Channel value of symbol and historical CPICH Common Pilot Channel value of symbol; Said non real-time channel estimation value and said deviate are carried out weighted sum calculate the Real-time Channel estimated value.
2. the method for claim 1 is characterized in that,
After calculating deviate this deviate is carried out the IIR digital filtering, the deviate that will carry out the processing of IIR digital filtering again is used for the calculating real-time channel estimation value.
3. the method for claim 1 is characterized in that,
According to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
4. the method for claim 1 is characterized in that,
During the calculation deviation value; Discrete time point or CPICH Common Pilot Channel value of symbol that the non real-time channel estimation value is corresponding with historical non real-time channel estimation value differ X discrete time point with the corresponding discrete time point of historical CPICH Common Pilot Channel value of symbol, and X is the integer less than 5.
5. the channel estimating apparatus of an enhancing, said device is arranged in portable terminal, it is characterized in that,
Said channel estimating apparatus comprises non real-time channel estimation module, deviate computing module, Real-time Channel estimation module; The output of said non real-time channel estimation module is connected with the input of said deviate computing module;
Said non real-time channel estimation module is used for obtaining the non real-time channel estimation value according to the CPICH Common Pilot Channel sign computation that receives, and exports the non real-time channel estimation value that obtains to said deviate computing module and said Real-time Channel estimation module;
Said deviate computing module is used to calculate the deviate of non real-time channel estimation module non real-time channel estimation value of exporting and the historical non real-time channel estimation value of having deposited, and outputs to the Real-time Channel estimation module:
Said Real-time Channel estimation module is used for that the deviate that the non real-time channel estimation value and the said deviate computing module of said non real-time channel estimation module output are exported is carried out weighted sum and calculates the Real-time Channel estimated value.
6. device as claimed in claim 5 is characterized in that,
Said device also comprises the filtration module that is connected between said deviate computing module and the said Real-time Channel estimation module;
Said filtration module is used for the deviate of said deviate computing module output is carried out inputing to said Real-time Channel estimation module behind the IIR digital filtering.
7. like claim 5 or 6 described devices, it is characterized in that,
Said Real-time Channel estimation module; Also be used for according to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
8. the channel estimating apparatus of an enhancing, said device is arranged in portable terminal, it is characterized in that,
Said channel estimating apparatus comprises non real-time channel estimation module, deviate computing module, Real-time Channel estimation module;
Said non real-time channel estimation module is used for obtaining the non real-time channel estimation value according to the CPICH Common Pilot Channel sign computation that receives, and exports the non real-time channel estimation value that obtains to said Real-time Channel estimation module;
Said deviate computing module is used to calculate the deviate of CPICH Common Pilot Channel value of symbol that receives and the historical CPICH Common Pilot Channel value of symbol of having deposited, and outputs to the Real-time Channel estimation module;
Said Real-time Channel estimation module is used for that the deviate that the non real-time channel estimation value and the said deviate computing module of said non real-time channel estimation module output are exported is carried out weighted sum and calculates the Real-time Channel estimated value.
9. device as claimed in claim 8 is characterized in that,
Said device also comprises the filtration module that is connected between said deviate computing module and the said Real-time Channel estimation module;
Said filtration module is used for the deviate of said deviate computing module output is carried out inputing to said Real-time Channel estimation module behind the IIR digital filtering.
10. like claim 8 or 9 described devices, it is characterized in that,
Said Real-time Channel estimation module; Also be used for according to following method calculating real-time channel estimation value: with said deviation multiply by behind the compensating factor with said non real-time signal estimated value and as the live signal estimated value, said compensating factor is one to be less than or equal to 1 non-zero real.
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| CN103916334A (en) * | 2012-12-30 | 2014-07-09 | 重庆重邮信科通信技术有限公司 | Channel estimation method and device |
| CN103986674A (en) * | 2014-04-18 | 2014-08-13 | 北京交通大学 | Uplink Time-Frequency Coding Cooperative MC-CDMA Channel Estimation Method in Mine Roadway |
| CN111079993A (en) * | 2019-12-02 | 2020-04-28 | 无锡大华锐频科技有限公司 | Traffic flow prediction method and device, electronic equipment and storage medium |
| CN114866167A (en) * | 2022-04-18 | 2022-08-05 | 哲库科技(北京)有限公司 | Channel parameter estimation method, device, equipment, storage medium and program product |
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| CN101577581A (en) * | 2008-05-09 | 2009-11-11 | 北京大学 | A Channel Estimation Method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103916334A (en) * | 2012-12-30 | 2014-07-09 | 重庆重邮信科通信技术有限公司 | Channel estimation method and device |
| CN103916334B (en) * | 2012-12-30 | 2017-03-29 | 锐迪科（重庆）微电子科技有限公司 | A kind of channel estimation methods and device |
| CN103986674A (en) * | 2014-04-18 | 2014-08-13 | 北京交通大学 | Uplink Time-Frequency Coding Cooperative MC-CDMA Channel Estimation Method in Mine Roadway |
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| CN111079993A (en) * | 2019-12-02 | 2020-04-28 | 无锡大华锐频科技有限公司 | Traffic flow prediction method and device, electronic equipment and storage medium |
| CN114866167A (en) * | 2022-04-18 | 2022-08-05 | 哲库科技(北京)有限公司 | Channel parameter estimation method, device, equipment, storage medium and program product |
| CN114866167B (en) * | 2022-04-18 | 2024-08-06 | 哲库科技(北京)有限公司 | Channel parameter estimation method, device, equipment, storage medium and program product |
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