WO2012071832A1 - 信道估计方法及系统 - Google Patents
信道估计方法及系统 Download PDFInfo
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- WO2012071832A1 WO2012071832A1 PCT/CN2011/071916 CN2011071916W WO2012071832A1 WO 2012071832 A1 WO2012071832 A1 WO 2012071832A1 CN 2011071916 W CN2011071916 W CN 2011071916W WO 2012071832 A1 WO2012071832 A1 WO 2012071832A1
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- Prior art keywords
- pilot
- frequency domain
- estimation
- point
- domain response
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1081—Reduction of multipath noise
-
- 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
- H04L25/022—Channel estimation of frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
Definitions
- the invention relates to a method and system for estimating ramps, and in particular to a method and system for estimating ramps including the £J super K path. Background technique
- the transmission transmitted by the transmitting end may arrive at the receiving end through different transmission paths (ie, ramps) of r ⁇ i. Therefore, the receiving end needs to detect the super K path to obtain an accurate channel estimation.
- the existing super long diameter test there are two methods for the existing super long diameter test -
- /7 /7 . + ⁇ , P. For the position label of the first spreading pilot, ⁇ is the M-space of the adjacent pilot, which is the pilot number, then the response at the pilot is:
- : Can be out, if there is a super diameter satisfying ' ⁇ + " > () , then use the spread
- the ramp estimate made by the pilot will be blurred, because the sum of ⁇ in the I: equation corresponds to the same result. That is to say, in the channel estimation method using the scattered pilot, the estimated range does not exceed that shown in FIG. 1.
- the scatter is utilized.
- the pilot performs the channel estimation, there is an aliasing component in the frequency domain response of the channel, which causes the channel estimation to be ambiguous. At this time, the method of channel estimation based only on the scattered pilot will be effective.
- the purpose of the wood invention is to provide a method and system for estimating roads.
- the channel estimation method provided by the present invention includes the following steps: 1) extracting each pilot signal from the received multipath information, and then, each channel guide. In the frequency spectrum, the channel and the second pilot are included; 2) based on the estimation of the delay of each pilot signal and the extracted pilot, the first estimated channel frequency domain is obtained.
- the channel estimation system of the present invention includes: an extraction module, configured to extract each pilot signal from the received multipath signal, wherein each pilot ⁇ - - - - - - - - - - - - - - - - - a second pilot; a frequency domain response estimation module for obtaining a channel frequency domain response of the initial estimation by using an estimate of the delay of each pilot signal and the extracted pilot frequency; And calculating, by using the channel frequency domain response of the first estimate of the frequency domain, an estimated frequency domain response of each pilot point in the second pilot, and obtaining, according to the extracted second pilot, each derivative in the second pilot The actual value of the frequency point, and then calculate the deviation between the frequency domain response estimate of each pilot point and the 3 ⁇ 4 interval; the detection module, whether there is an aliasing component in the channel frequency domain response of the initial estimation of the Chuan detection; After determining the presence of the aliasing component by using the ⁇ 3 ⁇ 4 detecting module, determining the position of each aliasing point
- the advantage of the ramp estimation method and system of the present invention is that the super K transmission path can be detected, thereby avoiding aliasing interference caused by signals transmitted by the ultra long transmission path, thereby obtaining more For superior performance.
- m i is the existing base f spread pilot iw f channel estimates the intent of the if ⁇ j time domain response.
- m 2 is a flowchart of Embodiment 1 of the i ⁇ j channel estimation method of the present invention.
- 1*1 3 is the estimated original intent of the channel estimation method.
- 1*1 4 is the small-intention of the cluster center position of the time domain correlation/style estimation adopted by the channel estimation method of the present invention.
- m 5 is a flowchart of Embodiment 2 of the channel estimation method according to the present invention.
- m 6 is a schematic structural diagram of the channel estimation system of the present invention.
- the channel estimation method of bursting will be described in detail below with reference to the accompanying drawings.
- the wood yim method ⁇ playing the communication system with the first-to-pilot and the second pilot, for example, a system using OFDM transmission technology, specifically, supporting the digital terrestrial television broadcasting system standard (ie, DVB-T) Or a system for mobile multimedia broadcast (ie, C), etc., wherein the first pilot is usually a spread pilot, and the second pilot may be a continuous pilot or system transmission information (ie, TPS, etc.) It can also be a continuous pilot: a total combination of the system and the transmission, and so on.
- step S1 after receiving the multipath ⁇ , the receiving end extracts each pilot from the multipath nickname, where each pilot signal includes ⁇ _ # ⁇ and second pilot.
- the receiving end may extract a pilot signal from the multipath signal by using a tap; the receiving end includes but is not limited to: a mobile station, a base station, and the like:
- step S2 the receiving end obtains the first estimated channel frequency domain response based on the estimated delay of each pilot debit and the extracted first frequency, for example, the estimated by the receiver
- the delay of the first signal transmitted by a transmission path is ⁇ ...
- the estimated delay of the first transmission path ft is 3 ⁇ 4 ⁇
- aliasing occurs based on the frequency domain estimation of the pilot containing the pilot from the superpath, as shown in Figure 3.
- the frequency domain response ff ⁇ J technique is estimated, such as ft interpolation, transform domain method, etc. It is known to those skilled in the art and will not be described in detail herein.
- step S3 the receiver calculates a frequency domain response estimation value of each pilot point in the second pilot according to the initially estimated channel frequency domain response, and obtains the second pilot based on the extracted second pilot.
- the actual value of each pilot point in the two pilots, and then the deviation between the frequency domain response estimate of each pilot point and the 3 ⁇ 4 interval is calculated.
- the second pilot obtained by the receiver obtains the actual value of each pilot point, that is, according to the impulse response obtained by the tap, and converts it into the frequency domain, for example, performing FFT transformation, and then obtaining the symbol pair
- the 3 ⁇ 4 value of each pilot point of the two pilots For example, for ⁇ Second Pilot Set:
- the tap response is noise, the tap response of the missed check, and /'" are additive noise, 'and the delay of the missed tap corresponding to the delay and the human, respectively, and nj is regarded as additive noise.
- the noise can be ⁇ small ⁇ ⁇ ⁇ , , , , ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- step S4 the receiving end detects whether the initial estimated channel frequency domain response has an aliasing component, and the detecting method includes but is not limited to:
- the first type of detection method is: performing statistics on the characteristics of the deviations of the pilot points, and comparing the statistical result with the estimated energy and noise of the frequency response of the second pilot to detect the first time Whether there is aliasing ⁇ in the estimated channel frequency domain response.
- the system nJ is based on the eigenvalues of the deviations of the partial pilot points, and nJ is based on the eigenvalues of the deviations of all the pilot points.
- the feature values include, but are not limited to, a norm, and the like. For example, the deviation of each pilot point represents
- the second detection method is: the sequence number of each pilot point is used, that is, the deviation of each pilot point is divided into two groups of parity, and the eigenvalues of the two groups are compared (for example, norm) to detect It is estimated that there is an aliasing in the frequency domain response. Because, under certain pilot distributions, if the deviation is ⁇ even, the value will not contain the total number of aliases. Thus, the subscripts in the difference are evenly divided into two sets, and the two subsets are divided into two sets. After the eigenvalues of the components of the ⁇ are statistically compared, it is also possible to determine whether or not aliasing exists.
- step S5 if the result of the detection indicates that there is a ⁇ 1 ⁇ 2 overlap display, the position of each aliasing component is determined according to each deviation.
- each aliasing component can be regarded as a forbidden first, so that the center position of the pilot point can be determined according to the deviation of each pilot point, and the deviation for the pilot point is:
- the number of elements which is the set of the elements corresponding to F marked with the number of turns in ⁇ ; then, in the de: except the center delay, the aliasing delay is limited to x /2 x s 2 )', where ⁇ F rounding;
- the conjugate gradient algorithm can be used to estimate the aliasing components. In the present embodiment, as shown in Fig. 3, after the processing is described, the position of an aliasing component can be obtained.
- ⁇ ⁇ Determining the cluster center position is performed in the frequency domain, ⁇ ⁇ , those skilled in the art should understand that it can also be observed in the time domain to obtain the cluster core position, such as The frame structure of the cyclic prefix, i 'to pass the loop correlation, the statistics one The correlation of the fixed length, by determining the corresponding amplitude is low to determine the received multipath signal 3 ⁇ 4 ⁇ ⁇ has the signal of the £J super K path, and determines the position of the ⁇ of the J ⁇ ⁇ , Small, ., "1" In the range of one OFDM, it is detected that the effective component exceeding N norm exists, and the position of the symbol to the heart can be regarded as the cluster heart.
- step S6 the receiver corrects the initially estimated channel frequency domain response according to the determined position of the aliasing.
- the obtained aliasing component is ⁇ ( , ), , ⁇ ,''',( , ⁇ ,
- the corrected channel frequency domain is estimated as: ' , where
- step S7 if the initially estimated channel frequency domain response ⁇ there is no aliasing component, the initially estimated channel frequency domain response is directly used as the final channel estimation result.
- Example 2 - See circle 5 this embodiment differs from the first embodiment in that the order of the steps is different, that is, after steps S1 and S2 are performed, and then, in step S3', the receiver detects the initial estimate. There is aliasing in the channel frequency domain response.
- the receiver can detect by using the third checking method described above; then, in step S4', the detection result indicates that there is an aliasing component, according to the Calculating the frequency domain response estimates of the pilot points in the second pilot in the initial estimated channel frequency domain response of the ⁇ symbol, and then calculating the frequency domain response estimates of the respective pilot points and the extracted second pilot based on The deviation between the obtained values of the pilot points is the same, and then steps S5 to S7 are the same as the embodiment, and will not be described here.
- FIG. 6 is a schematic diagram of the structure of the channel estimation system of the present invention.
- the channel estimation system includes: an extraction module 11, a channel frequency domain response estimation block 12, a deviation estimation block 13, a detection module 14, a positioning block 15, and a correction module 16, which can be installed in the receiver.
- the receiver may transmit and receive signals by using an OFDM transmission technology, including but not limited to: a mobile station, a base station, and the like.
- the extraction module n ⁇ extracts each pilot signal from the multipath ,, wherein each pilot (each channel includes a first pilot and a second pilot.
- the extraction module Extracting a pilot signal from the multipath signal; the first pilot is usually a spreading pilot, and the second pilot may be a continuous pilot or a system f transmission total (, TPS, etc.) It is also possible to combine continuous pilot and system transmission, and the like.
- the multiplier frequency domain sounds M estimates the block 12 ⁇ [ ⁇ based on the estimation of the delay of each pilot signal and the extracted pilot frequency, to obtain the first estimated if channel frequency domain response, for example, the track frequency domain * It should be estimated that the delay of the first signal transmitted by the first transmission path estimated by the module 12 is ⁇ ..., and the estimated signal delay transmitted by the estimated transmission path is ⁇ , etc., thereby obtaining the first time
- the channel frequency domain response estimation block 12 includes the frequency domain estimation of the pilot of the super K path, and aliasing occurs, as shown in FIG.
- the estimation of the frequency domain response ff ⁇ J technique according to the first pilot, such as the interpolation method, the transform domain method, etc., is known to those skilled in the art, and therefore will not be described in detail herein.
- the deviation estimation module 13 calculates the frequency domain response estimation value of each pilot point in the second pilot according to the obtained first estimated frequency channel frequency domain, and further calculates the frequency domain of each pilot point.
- the response between the estimated value and the base the deviation between the pilot points and the actual ⁇ obtained by the extracted second pilot.
- the deviation estimation correction block 13 obtains the actual value of each pilot point based on the extracted second pilot, that is, the impulse obtained according to the tap is converted into the frequency domain, for example, performing FFT transformation.
- the actual value of each pilot point of the second pilot is obtained, and a deviation between the second actual frequency domain response values can be obtained.
- the pilot point, the frequency range of each pilot point estimated by the deviation meter 13 is:
- ⁇ , ⁇ ⁇ , p(-/2nkT l ⁇ N)
- the detecting module 14 detects whether there is an aliasing component in the initially estimated channel frequency domain response.
- the verification block 1-1 may include a unified unit (the figure is not small), a first unit: a unit (not shown), and a first comparison unit (not shown).
- the statistical unit is configured to perform statistics on the eigenvalues of the deviations of the pilot points;
- the first unit is used to estimate the frequency domain response of the second pilot of the ⁇ 1 ⁇ 4 energy and the noise variance;
- the element compares the statistical result of the statistical unit with the calculation result of the first calculating unit to detect whether there is an overlapping component in the first estimated channel frequency domain response.
- 3 ⁇ 4 eigenvalue statistics can also be calculated based on the eigenvalues of the deviations of all pilot points.
- the special value includes ⁇ not limited to: a norm, and the like.
- the deviation table of each pilot point is small -
- 111 is a q -th order norm, th & a threshold according to the noise power and the estimation precision
- the detection block may include: a group u (not shown), a second calculation unit (not shown), and a second comparison unit (not shown).
- the grouping unit uses the sequence number of each pilot point, that is, the deviation of each pilot point is divided into two groups; the second bill counts the characteristics of the parity group (for example, norm); the second comparison unit The eigenvalues of the statistical parity groups are compared to detect whether there is an aliasing component in the first estimated channel frequency domain response. Because, under certain pilot distributions, if the values are even, the value will not contain the aliasing information. Thus, the subscripts in the deviation are divided into two subsets by the f, and the two subsets will be After the special & statistical comparison, the comparison can also be judged Broken is ⁇ ⁇ There is aliasing.
- the detection block may be: a correlation detection element (the picture is not small).
- the correlation detecting unit detects whether or not the aliasing component exists based on the temporal correlation of the cyclic prefix of each of the received multipath apostrophes.
- the positioning module 15 determines the position of each alias based on each deviation after determining that the correction block has an aliasing component.
- the positioning module 15 nJli includes: cluster center estimation ⁇ (not shown), and - positioning unit (not shown). ⁇ , cluster center estimation ⁇
- Each aliasing component is treated as a cluster, and the cluster core position is determined according to the deviation of each pilot point. The deviation from each pilot point is:
- ⁇ ,' ⁇ ⁇ ⁇ - ⁇ (-/2 ⁇ / ( I ⁇ )) exp(— ./2 / ⁇ ) + ⁇ + ⁇ + ⁇ m
- the cluster core estimate is the cluster core position JL: ⁇ arg(.) is the phase operation, II is the number of elements in the set, and is a subset of the elements corresponding to the -F flag.
- the sub-positioning unit removes the center delay, and the aliasing delay is limited to ⁇ ' ⁇ ⁇ ⁇ , and the sub-positioning unit uses the conjugate-like gradient algorithm to estimate the aliasing components.
- the position of an aliasing component can be obtained.
- ... 1 The estimation of the center position of the cluster by the estimation unit of the center is performed in the frequency domain, : ' ji: real... It should be understood by those skilled in the art that it can also Processing in the time domain, to the center position of the cluster, for example, for a frame structure containing a cyclic prefix, it is possible to determine the correlation of a certain length by cyclic correlation, and determine whether the received multipath signal is determined by determining the corresponding amplitude to be low.
- the letter from the super long path determines the position of the ⁇ of the ⁇ of the extra long path, tm shows, "i in the range of OFDM symbols, the effective component of the 3 ⁇ 4 over range is detected, and the obtained center position can be Think of it as a center.
- the correction module 16 corrects the channel frequency domain response of the initial estimation according to the determined position of the aliasing ⁇ , for example, the aliasing component obtained by the sub-positioning unit is " ⁇ , ⁇ ) ⁇ 5 "),..., ( , ⁇ , correspondingly, the modified module 16 is modified
- the channel frequency domain is estimated as: ' , where, If: fe ⁇ NJn, J:
- the received channel frequency domain response eliminates aliasing.
- the correction module 16 directly uses the initial estimated channel frequency domain response as the final channel estimation result.
- Summary 1 the method of estimating the channel A and the system Lichuan transmission parameter command (TPs) or the discontinuous pilot to detect the super long path, and using the information to correct the transform domain channel estimation result r ⁇ i This can be more accurate performance.
- TPs system Lichuan transmission parameter command
- TPs discontinuous pilot
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WO2019028702A1 (zh) * | 2017-08-09 | 2019-02-14 | 华为技术有限公司 | 一种导频处理方法及装置、系统 |
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CN104660540B (zh) * | 2013-11-21 | 2018-11-16 | 展讯通信(上海)有限公司 | 一种lte系统的同步跟踪方法 |
CN110808930B (zh) * | 2019-11-06 | 2022-06-07 | 紫光展锐(重庆)科技有限公司 | 信道估计方法、装置及存储介质 |
US11140014B1 (en) * | 2020-11-25 | 2021-10-05 | Silicon Laboratories Inc. | System and method for efficient timing estimation and tracking in an orthogonal frequency division multiplexing (OFDM) communication system |
JP2023120886A (ja) * | 2022-02-18 | 2023-08-30 | 株式会社Kddi総合研究所 | 無線通信における高精度なチャネル推定を実行する制御装置、制御方法、及びプログラム |
CN117411570B (zh) * | 2023-12-15 | 2024-03-22 | 深圳捷扬微电子有限公司 | 一种天线射频通路状态的检测方法及装置 |
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