CN102369707B - Method and device for eliminating co-channel interference on pilot frequency - Google Patents

Method and device for eliminating co-channel interference on pilot frequency Download PDF

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CN102369707B
CN102369707B CN201180001820.7A CN201180001820A CN102369707B CN 102369707 B CN102369707 B CN 102369707B CN 201180001820 A CN201180001820 A CN 201180001820A CN 102369707 B CN102369707 B CN 102369707B
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signal
path position
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interfered cell
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CN102369707A (en
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刘佳迪
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • 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
    • H04L25/0218—Channel estimation of impulse response with detection of nulls
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements

Abstract

The invention discloses a method and a device for eliminating a co-channel interference on a pilot frequency, relating to the communication technology, and used for solving the problem that a channel estimation based on the pilot frequency or a time-frequency synchronization performance in the prior art is worse. The technical scheme provided by the embodiment of the invention comprises the stepsof carrying out a time domain channel estimation on an interference cell to obtain a time domain channel estimation signal of the interference cell; acquiring a path position of the interference cell; setting zero for the time domain channel estimation signal at the path position to obtain a time domain channel estimation signal eliminated interference; carrying out a reconstruction on the time domain channel estimation signal eliminated interference to obtain a reconstructed frequency domain receiving signal. The embodiment of the invention can be used in an orthogonal frequency division multiplexing(OFDM) system.

Description

Eliminate the method and apparatus of the co-channel interference on the pilot tone
Technical field
The present invention relates to the communication technology, relate in particular to a kind of method and apparatus of eliminating the co-channel interference on the pilot tone.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is as a kind of multi-carrier modulation technology, and advantage is widely used in the present mobile communication technology because availability of frequency spectrum robustness high and multipath channel is good etc.In the radio communication, when the user receives the signal of Serving cell transmission, also can receive the interference signal from homogeneous-frequency adjacent-domain; In order to eliminate the co-channel interference signal that receives simultaneously when the user receives the Serving cell signal, can adopt interference coordination technique or adopt merging (Interference Rejection Combining, the IRC) technology of suppressing of disturbing at receiver side in base station side.Yet, when the subcarrier of the pilot signal of carrying interfered cell and Serving cell is identical and synchronous the pilot tone of the Pilot Interference Serving cell of interfered cell (time), can't eliminate co-channel interference on the Serving cell pilot tone by interference coordination technique or IRC technology.
If n receives signal is Y n, this Y nSatisfy formula 1, wherein X SnBe Serving cell pilot signal, H SnBe X SnChannel impulse response, X InBe interfered cell pilot signal, H InBe X InChannel impulse response; X InAnd X SnCan be according to the ID of Serving cell and interfered cell, and corresponding agreement generates;
Y n=H SnX Sn+ H InX InPublic
Formula 1
Receive signal Y nChannel impulse response for the interfered cell pilot tone is shown in the formula 2;
H n＝Y n/X In＝H SnX Sn/X In+H In
Formula 2
Since in the coherence bandwidth, the H of all pilot signals SnAnd H InCan be considered as constantly, be made as H S, H I, therefore obtain formula 3;
1 n Σ n H n = 1 n Σ n H Sn X S / X In + H I Formula 3
Because the Serving cell pilot signal is uncorrelated with the interfered cell pilot signal, when n is abundant,
1 n Σ n H Sn X S / X In ≈ 0 , Substitution formula 3 can obtain formula 4;
1 n Σ n H n ≈ H I Formula 4
We have just obtained the channel impulse response of interfered cell like this, ask H from formula 1 Sn, obtain formula 5;
H Sn=(Y n-H InX In)/X SnFormula 5
With formula 4 substitution formula 5, obtain formula 6;
H Sn = ( Y n - 1 n Σ n H n X In ) / X Sn
Formula 6
Therefore can with
Figure BDA0000100976050000024
Eliminate as the co-channel interference on the pilot tone, thus the channel impulse response of the Serving cell pilot signal after the co-channel interference on the pilot tone that is eliminated
Figure BDA0000100976050000025
Can use this H SnCarry out channel estimating or Time and Frequency Synchronization based on pilot tone.
State in realization in the process of eliminating co-channel interference, the inventor finds prior art, and there are the following problems at least: in order to improve the availability of frequency spectrum, pilot distribution is more sparse, at coherence bandwidth hour (channel that frequency selective fading is bigger), the pilot tone of interfered cell is less in the coherence bandwidth band
Figure BDA0000100976050000026
Therefore the co-channel interference of eliminating on the pilot tone by said process can produce error, causes the poor-performing based on channel estimating or the Time and Frequency Synchronization of pilot tone.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus of eliminating the co-channel interference on the pilot tone, can improve based on the channel estimating of pilot tone or the performance of Time and Frequency Synchronization.
On the one hand, provide a kind of method of eliminating the co-channel interference on the pilot tone, having comprised: interfered cell has been carried out time domain channel estimate, obtain the time domain channel estimated signal of described interfered cell; Obtain the path position of described interfered cell; With the described time domain channel estimated signal zero setting at described path position place, obtain disturbing the time domain channel estimated signal after the elimination; Time domain channel estimated signal after described interference eliminated is reconstructed, and the frequency domain that obtains after the reconstruct receives signal.
On the other hand, provide a kind of device of eliminating the co-channel interference on the pilot tone, having comprised:
The time domain estimation module is used for that interfered cell is carried out time domain channel and estimates, obtains the time domain channel estimated signal of described interfered cell;
The path position acquisition module is for the path position that obtains described interfered cell;
The first zero setting module is used for the described time domain channel estimated signal zero setting with described path position place, obtains disturbing the time domain channel estimated signal after the elimination;
Reconstructed module, the time domain channel estimated signal after being used for described interference eliminated is reconstructed, and the frequency domain that obtains after the reconstruct receives signal.
The method and apparatus of the co-channel interference on the elimination pilot tone that the embodiment of the invention provides by the time domain channel estimated signal zero setting with path position, is reconstructed after obtaining disturbing the time domain channel estimated signal after the elimination, and the frequency domain that obtains after the reconstruct receives signal.Because the energy of interference signal mainly concentrates on the path position place of time domain channel estimated signal, therefore with the time domain channel estimated signal zero setting of path position, can effectively eliminate the interference on the pilot signal, thereby can improve based on the channel estimating of pilot tone or the performance of Time and Frequency Synchronization.The technical scheme that the embodiment of the invention provides has solved in the prior art because the co-channel interference of eliminating on the pilot tone can produce error, causes the problem based on the poor-performing of the channel estimating of pilot tone or Time and Frequency Synchronization.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The flow chart of the method for the co-channel interference on the elimination pilot tone that Fig. 1 provides for the embodiment of the invention one;
The flow chart of the method for the co-channel interference on the elimination pilot tone that Fig. 2 provides for the embodiment of the invention two;
The flow chart one of the method for the co-channel interference on the elimination pilot tone that Fig. 3 provides for the embodiment of the invention three;
The flowchart 2 of the method for the co-channel interference on the elimination pilot tone that Fig. 4 provides for the embodiment of the invention three;
The structural representation one of the device of the co-channel interference on the elimination pilot tone that Fig. 5 provides for the embodiment of the invention four;
The structural representation two of the device of the co-channel interference on the elimination pilot tone that Fig. 6 provides for the embodiment of the invention four;
Fig. 7 is the structural representation of time domain estimation module in the device of the co-channel interference on the elimination pilot tone shown in Figure 5;
Fig. 8 is the structural representation of reconstructed module in the device of the co-channel interference on the elimination pilot tone shown in Figure 5;
Fig. 9 is the structural representation one of path position acquisition module in the device of the co-channel interference on the elimination pilot tone shown in Figure 5;
Figure 10 is the structural representation two of path position acquisition module in the device of the co-channel interference on the elimination pilot tone shown in Figure 5;
Figure 11 is the structural representation three of path position acquisition module in the device of the co-channel interference on the elimination pilot tone shown in Figure 5.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides a kind of method and apparatus of eliminating the co-channel interference on the pilot tone, can solve in the prior art problem based on the poor-performing of the channel estimating of pilot tone or Time and Frequency Synchronization.
As shown in Figure 1, the method for the co-channel interference on the elimination pilot tone that the embodiment of the invention one provides comprises:
Step 101 is carried out channel estimating to interfered cell, obtains the time domain channel estimated signal of this interfered cell.
In the present embodiment, interfered cell can be one of residential quarter adjacent with home cell in the step 101, and the pilot signal of the pilot signal of this adjacent residential quarter and home cell belongs to same frequency range.Carrying out channel estimating by step 101 pair interfered cell can estimate for the pilot signal of interfered cell being carried out time domain channel; Wherein, the pilot signal of interfered cell can (Identity, ID) or the adjacent area pilot frequency sequence, and corresponding agreement generates according to adjacent area sequence of cells number.The specific implementation of this process S101 can be carried out with reference to prior art, and present embodiment is not done this and given unnecessary details.
Step 102 is obtained the path position of this interfered cell.
In the present embodiment, obtain the path position of interfered cell by step 102, can obtain the power-delay spectrum for the time domain channel estimated signal that obtains according to step 101, and obtain the path position of interfered cell according to this power-delay spectrum and the coefficient of efficiency that sets in advance; Also can for by based on Cyclic Prefix (Cyclic Prefix, mode CP) is obtained the path position of interfered cell; Also can for by based on master sync signal (PrimarySynchronization Channel, mode P-SCH) is obtained the path position of interfered cell; Can also obtain the path position of interfered cell by other means, give unnecessary details no longer one by one at this.Wherein, the footpath in the wireless channel because the transmission path that reflection or refraction form between transmitter and receiver, the time delay in the initial moment of reception data that the moment that a kind of path position can arrive UE through transmission path for transmitting and UE safeguard.Introduced the path position that how to obtain a residential quarter in the prior art, present embodiment can be carried out with reference to existing method.
Step 103 with the time domain channel estimated signal zero setting at path position place, obtains disturbing the time domain channel estimated signal after the elimination.
In the present embodiment, because when interfered cell is carried out the time domain channel estimation, energy from the interference signal of adjacent area mainly concentrates on the path position place, and the energy of Serving cell roughly is evenly distributed on all sampling points, therefore can under the less situation of useful signal loss, greatly eliminate the co-channel interference on the pilot tone by the time domain channel estimated signal zero setting with the path position place.
Step 104, the time domain channel estimated signal after this interference eliminated is reconstructed, and the frequency domain that obtains after the reconstruct receives signal.
In the present embodiment, the process that in the step 104 the time domain channel estimated signal of disturbing after eliminating is reconstructed, can comprise: (Fourier transform FFT), obtains disturbing the frequency domain channel estimated signal after the elimination at first will to disturb time domain channel estimated signal after eliminating to carry out the frequency domain conversion; Then this frequency domain channel estimated signal is reconstructed, obtains disturbing the frequency domain after the elimination to receive signal.Can be directly to disturbing the time domain channel estimated signal after eliminating to be reconstructed by step 104; Also can before reconstruct, at first to disturbing the time domain channel estimated signal after eliminating to handle, be reconstructed by the time domain channel estimated signal after the elimination of the interference after the step 104 pair processing, give unnecessary details no longer one by one at this.
In the present embodiment, when at least two of the interfered cells of Serving cell, can at first disturb elimination based on receiving signal to one of them interfered cell by said process, the frequency domain that obtains after first reconstruct receives signal; And then receive signal by the frequency domain of said process after based on first reconstruct another interfered cell is disturbed elimination, the frequency domain that obtains after second reconstruct receives signal; Up to the interference of eliminating all interfered cells by said process.
The method of co-channel interference on the elimination pilot tone that the embodiment of the invention provides by the time domain channel estimated signal zero setting with path position, is reconstructed after obtaining disturbing the time domain channel estimated signal after the elimination, and the frequency domain that obtains after the reconstruct receives signal.Because the energy of interference signal mainly concentrates on the path position place of time domain channel estimated signal, therefore with the time domain channel estimated signal zero setting of path position, can effectively eliminate the interference on the pilot signal, thereby can improve based on the channel estimating of pilot tone or the performance of Time and Frequency Synchronization.The technical scheme that the embodiment of the invention provides has solved in the prior art because the co-channel interference of eliminating on the pilot tone can produce error, causes the problem based on the poor-performing of the channel estimating of pilot tone or Time and Frequency Synchronization.
As shown in Figure 2, the method for the co-channel interference on the elimination pilot tone that the embodiment of the invention two provides comprises:
Step 201 is carried out time domain channel to interfered cell and is estimated to step 202, obtains the time domain channel estimated signal of this interfered cell, and obtains the path position of interfered cell.Detailed process is similar to step 102 to step 101 shown in Figure 1, gives unnecessary details no longer one by one at this.
Step 203 with the time domain channel estimated signal zero setting of the default number position in this path position and path position both sides, obtains disturbing the time domain channel estimated signal after the elimination.
In this enforcement, because after interfered cell being carried out the time domain channel estimation, energy from the interference signal of adjacent area mainly concentrates on the path position place, and also can concentrate the energy of the pilot signal of interfered cell on several sampling points of path position both sides, therefore can on the time domain channel estimated signal of disturbing after eliminating, path position and path position both sides be preset the time domain channel estimated signal zero setting of number by step 203, thereby can further eliminate the co-channel interference on the pilot tone.
Step 204 is reconstructed the time domain channel estimated signal after the zero setting.Detailed process is similar to step 104 shown in Figure 1, gives unnecessary details no longer one by one at this.
In the present embodiment, when at least two of the interfered cells of Serving cell, can at first disturb elimination based on receiving signal to one of them interfered cell by said process, the frequency domain that obtains after first reconstruct receives signal; And then receive signal by the frequency domain of said process after based on first reconstruct another interfered cell is disturbed elimination, the frequency domain that obtains after second reconstruct receives signal; Up to the interference of eliminating all interfered cells by said process.
The method of co-channel interference on the elimination pilot tone that the embodiment of the invention provides by the time domain channel estimated signal zero setting with path position, is reconstructed after obtaining disturbing the time domain channel estimated signal after the elimination, and the frequency domain that obtains after the reconstruct receives signal.Because the energy of interference signal mainly concentrates on the path position place of time domain channel estimated signal, therefore with the time domain channel estimated signal zero setting of path position, can effectively eliminate the interference on the pilot signal, thereby can improve based on the channel estimating of pilot tone or the performance of Time and Frequency Synchronization.The technical scheme that the embodiment of the invention provides has solved in the prior art because the co-channel interference of eliminating on the pilot tone can produce error, causes the problem based on the poor-performing of the channel estimating of pilot tone or Time and Frequency Synchronization.
As shown in Figure 3, the method for the co-channel interference on the elimination pilot tone that the embodiment of the invention three provides comprises:
Step 301 is obtained the pilot signal of interfered cell and the pilot signal that frequency domain receives.
In the present embodiment, the pilot signal of interfered cell can be according to residential quarter, adjacent area ID or adjacent area pilot frequency sequence in the step 301, and corresponding agreement generates.The pilot signal that step 301 frequency domain receives can be obtained by the pilot signal that time domain receives, and gives unnecessary details no longer one by one at this.
Step 302 is carried out division or conjugation multiplying with the pilot signal of frequency domain reception and the pilot signal of interfered cell, obtains the frequency domain channel estimated signal of interfered cell.
In the present embodiment, the frequency domain channel estimated signal H of the interfered cell that obtains by step 302 InterCell_fd=R/P InterCellWherein, R is the pilot signal that frequency domain receives, P InterCellBe the pilot signal of interfered cell, H InterCell_fdFrequency domain channel estimated signal for interfered cell.
Step 303, the two ends zero padding with the frequency domain channel estimated signal obtains first signal.
In the present embodiment, because when signal carried out the frequency domain to time domain conversion, frequency-region signal length need satisfy 2 integral number power.Therefore by the two ends zero padding of step 303 with the frequency domain channel estimated signal, first signal length that zero padding is obtained is 2 integral number power.
Step 304 is carried out inverse Fourier transform with first signal, obtains the time domain channel estimated signal.
Step 305 is obtained the path position of interfered cell.
In the present embodiment, obtain the path position of interfered cell by step 305, can obtain the power-delay spectrum for the time domain channel estimated signal that obtains according to step 304, and obtain the path position of interfered cell according to this power-delay spectrum and the coefficient of efficiency that sets in advance; Also can be for by obtain the path position of interfered cell based on the mode of CP; Also can be for by obtain the path position of interfered cell based on the mode of P-SCH; Can also obtain the path position of interfered cell by other means, give unnecessary details no longer one by one at this.
Wherein, obtain the power-delay spectrum according to the time domain channel estimated signal, and obtain the detailed process of the path position of interfered cell according to this power-delay spectrum and the coefficient of efficiency that sets in advance specifically can be referring to prior art, below it done briefly introduce, this process can comprise: at first, the time domain channel estimated signal is carried out computing module-square, obtain the channel power spectrum; Obtain this channel power most powerful path position then; According to this most powerful path position and the coefficient of efficiency that sets in advance, obtain path position at last.Be appreciated that those skilled in the art also can obtain the path position of a residential quarter by other prior art, do not do concrete expansion herein.
The detailed process of the path position by obtaining interfered cell based on the mode of CP can comprise: at first, the pilot signal that time domain is received is carried out likelihood and is estimated, obtains first correlation; Then, obtain the most powerful path position of interfered cell according to this first correlation; According to this most powerful path position and the coefficient of efficiency that sets in advance, obtain path position at last, this path position is the local maximum of first correlation.Wherein, the pilot signal that time domain receives is carried out the likelihood estimation, obtain first correlation, can calculate y by formula 7 1It is first correlation, L is the length of the Cyclic Prefix of agreement regulation, the pilot signal that r (x) receives for time domain, k is CP sequence index (being k element of CP sequence), (namely Xiang Guan original position is with respect to the skew of default OFDM symbol 0 position for the relevant offset index of sliding for d, negative value is illustrated in before 0 position, just is being illustrated in after 0 position), N is the data length of an OFDM symbol; Obtain the most powerful path position of interfered cell according to first correlation and can calculate d by formula 8 tBe the most powerful path position; Obtain path position according to most powerful path position and the coefficient of efficiency that sets in advance, can calculate by formula 9, p is path position, and a is the coefficient of efficiency that sets in advance.
y 1 = | Σ k = 0 L - 1 r ( k + d ) r * ( k + d + N ) | - 1 2 Σ k = 0 L - 1 ( | r ( k + d ) | 2 + | r ( k + d + N ) | 2 ) Formula 7
d t = arg max d y 1
Formula 8
p≥d t*a
Formula 9
The detailed process of the path position by obtaining interfered cell based on the mode of P-SCH can comprise: at first the pilot signal that time domain is received and the time-domain pilot signal of interfered cell carry out computing cross-correlation, obtain second correlation; Obtain the most powerful path position of interfered cell according to this second correlation; According to this most powerful path position and the coefficient of efficiency that sets in advance, obtain path position, this path position is the local maximum of second correlation.Wherein, the pilot signal of time domain reception and the time-domain pilot signal of interfered cell are carried out computing cross-correlation, obtain second correlation, can calculate by formula 10;
y 2 = | Σ n = 0 N - 1 r ( N + n + d ) s * ( N + n ) | Formula 10
In order to overcome the influence of frequency deviation, can obtain second correlation by formula 11, M is time domain segmentation cumulative number, s (x) is time domain master's synchronizing pilot signal of the local interfered cell that generates, time domain master's synchronizing pilot signal that r (x) receives for time domain, N is the master sync signal sequence length, n is the SCH sequence index, d is that (relevant original position is with respect to the skew of default master sync signal 0 position for slip relative offset index, negative value is illustrated in before 0 position, just be illustrated in after 0 position), m is the segments index; After obtaining path position according to second correlation, obtain the process of path position according to most powerful path position and the coefficient of efficiency that sets in advance, and by obtain the similar process of the path position of interfered cell based on the mode of CP, give unnecessary details no longer one by one at this.
y 2 = Σ m = 0 M - 1 | Σ n = 0 N M - 1 r ( m N M + n + d ) s * ( m N M + n ) | Formula 11
Step 306 with the time domain channel estimated signal zero setting at path position place, obtains disturbing the time domain channel estimated signal after the elimination.Detailed process is similar to step 103 shown in Figure 1, gives unnecessary details no longer one by one at this.
Step 307 with disturbing the time domain channel estimated signal after eliminating to carry out the frequency domain conversion, obtains the reconstructed frequency domain signal.Time domain channel estimated signal after described interference eliminated is reconstructed, and obtains frequency domain after the reconstruct and receives signal and can also can adopt alternate manner to carry out with reference to embodiment before.Such as, when interfered cell being carried out the time domain channel estimation, if the frequency domain channel estimated signal length of the interfered cell that generates is 2 integral number power, then do not need zero padding, therefore when being reconstructed, do not need the two ends result of reconstruct frequency-region signal is removed.Obtain the reconstructed frequency domain signal as for how the time domain channel estimated signal after the described interference elimination being carried out the frequency domain conversion, and how the pilot signal of described reconstructed frequency domain channel estimating signal and described interfered cell is carried out multiplying and obtain frequency domain after the reconstruct and receive signal and can carry out with reference to prior art, do not do expansion herein.
Step 308 is removed the two ends result of reconstructed frequency domain signal, obtains reconstructed frequency domain channel estimating signal.
In the present embodiment, the two ends result with the reconstructed frequency domain signal removes by step 308, and the position of this removal is with identical with the position of two ends zero padding by step 303.
Step 309 is carried out multiplying with the pilot signal of reconstructed frequency domain channel estimating signal and interfered cell, and the frequency domain that obtains after the reconstruct receives signal.
Further, as shown in Figure 4, eliminate the method for the co-channel interference on the pilot tone in the present embodiment, step 306 can also for: with the time domain channel estimated signal zero setting of the default number position of this path position and path position both sides, obtain disturbing the time domain channel estimated signal after the elimination.
In the present embodiment, when at least two of the interfered cells of Serving cell, can at first disturb elimination based on receiving signal to one of them interfered cell by said process, the frequency domain that obtains after first reconstruct receives signal; And then receive signal by the frequency domain of said process after based on first reconstruct another interfered cell is disturbed elimination, the frequency domain that obtains after second reconstruct receives signal; Up to the interference of eliminating all interfered cells by said process.
The method of co-channel interference on the elimination pilot tone that the embodiment of the invention provides by the time domain channel estimated signal zero setting with path position, is reconstructed after obtaining disturbing the time domain channel estimated signal after the elimination, obtains disturbing the frequency domain after the elimination to receive signal.Because the energy of interference signal mainly concentrates on the path position place of time domain channel estimated signal, therefore with the time domain channel estimated signal zero setting of path position, can effectively eliminate the interference on the pilot signal, thereby can improve based on the channel estimating of pilot tone or the performance of Time and Frequency Synchronization.The technical scheme that the embodiment of the invention provides has solved in the prior art because the co-channel interference of eliminating on the pilot tone can produce error, causes the problem based on the poor-performing of the channel estimating of pilot tone or Time and Frequency Synchronization.
As shown in Figure 5, the device of the co-channel interference on the elimination pilot tone that the embodiment of the invention four provides comprises:
Time domain estimation module 501 is used for that interfered cell is carried out time domain channel and estimates, obtains the time domain channel estimated signal of interfered cell.
In the present embodiment, interfered cell can be one of residential quarter adjacent with home cell in the time domain estimation module 501, and the pilot signal of the pilot signal of this adjacent residential quarter and home cell belongs to same frequency range.Carrying out channel estimating by 501 pairs of interfered cells of time domain estimation module can estimate for the pilot signal of interfered cell being carried out time domain channel; Wherein, the pilot signal of interfered cell can be according to residential quarter, adjacent area ID or adjacent area pilot frequency sequence, and corresponding agreement generates.
Path position acquisition module 502 is for the path position that obtains interfered cell.
In the present embodiment, obtain the path position of interfered cell by path position acquisition module 502, can obtain the power-delay spectrum for the time domain channel estimated signal that obtains according to time domain estimation module 501, and obtain the path position of interfered cell according to the coefficient of efficiency that this power-delay is composed and set in advance; Also can be for by obtain the path position of interfered cell based on the mode of CP; Also can be for by obtain the path position of interfered cell based on the mode of P-SCH; Can also obtain the path position of interfered cell by other means, give unnecessary details no longer one by one at this.Wherein, the footpath is in the wireless channel because the transmission path that reflection or refraction form between transmitter and receiver.
The first zero setting module 503 is used for the time domain channel estimated signal zero setting with the path position place, obtains disturbing the time domain channel estimated signal after the elimination.
In the present embodiment, because when interfered cell is carried out the time domain channel estimation, energy from the interference signal of adjacent area mainly concentrates on the path position place, and the energy of Serving cell roughly is evenly distributed on all sampling points, therefore can under the less situation of useful signal loss, greatly eliminate the co-channel interference on the pilot tone by the time domain channel estimated signal zero setting with the path position place.
Reconstructed module 504 is used for disturbing the time domain channel estimated signal after eliminating to be reconstructed, and the frequency domain that obtains after the reconstruct receives signal.
In the present embodiment, the process that in the reconstructed module 504 the time domain channel estimated signal of disturbing after eliminating is reconstructed, can comprise: (Fourier transform FFT), obtains disturbing the frequency domain channel estimated signal after the elimination at first will to disturb time domain channel estimated signal after eliminating to carry out the frequency domain conversion; Frequency domain channel after then this interference being eliminated is estimated to be reconstructed, and obtains disturbing the frequency domain after the elimination to receive signal.Can be directly to disturbing the time domain channel estimated signal after eliminating to be reconstructed by reconstructed module 504; Also can before reconstruct, at first to disturbing the time domain channel estimated signal after eliminating to handle, be reconstructed by the time domain channel estimated signal after the elimination of the interference after 504 pairs of processing of reconstructed module, give unnecessary details no longer one by one at this.
Further, as shown in Figure 6, the first zero setting module 503 in the device of the co-channel interference on the elimination pilot tone that present embodiment provides can comprise:
Zero setting submodule 5031 is used for the time domain channel estimated signal zero setting with the default number position of path position and path position both sides, obtains disturbing the time domain channel estimated signal after the elimination.
In this enforcement, because after interfered cell being carried out the time domain channel estimation, energy from the interference signal of adjacent area mainly concentrates on the path position place, and also can concentrate the energy of the pilot signal of interfered cell on several sampling points of path position both sides, therefore can on the time domain channel estimated signal of disturbing after eliminating, path position and path position both sides be preset the signal zero setting of number by zero setting submodule 5031, thereby can further eliminate the co-channel interference on the pilot tone.
Further, as shown in Figure 7, time domain estimation module 501 in the present embodiment can also comprise:
Signal obtains submodule 5011, is used for obtaining the pilot signal of interfered cell and the pilot signal that frequency domain receives.
In the present embodiment, signal obtains the pilot signal of interfered cell in the submodule 5011 can be according to residential quarter, adjacent area ID or adjacent area pilot frequency sequence, and corresponding agreement generates.Signal obtains the pilot signal of submodule 5011 frequency domain reception and can obtain by the pilot signal that time domain receives, and gives unnecessary details no longer one by one at this.
Frequency domain obtains submodule 5012, is used for the pilot signal of frequency domain reception and the pilot signal of interfered cell are carried out division or conjugation multiplying, obtains the frequency domain channel estimated signal of interfered cell.
In the present embodiment, obtain the frequency domain channel estimated signal H of the interfered cell that submodule 5012 obtains by frequency domain InterCell_fd=R/P InterCellWherein, R is the pilot signal that frequency domain receives, P InterCellBe the pilot signal of interfered cell, H InterCell_fdFrequency domain channel estimated signal for interfered cell.
Zero padding submodule 5013 is used for the two ends zero padding with the frequency domain channel estimated signal, obtains first signal, and first signal length is 2 integral number power.
In the present embodiment, because when signal carried out the frequency domain to time domain conversion, frequency-region signal length need satisfy 2 integral number power.Therefore by the two ends zero padding of zero padding submodule 5013 with the frequency domain channel estimated signal, first signal length that zero padding is obtained is 2 integral number power.
The first Fourier transform submodule 5014 is used for first signal is carried out inverse Fourier transform, obtains the time domain channel estimated signal of interfered cell.
Further, as shown in Figure 8, reconstructed module 504 in the present embodiment, can also comprise:
Frequency domain transformation submodule 5041 is used for disturbing the time domain channel estimated signal after eliminating to carry out the frequency domain conversion, obtains the reconstructed frequency domain signal.
Remove submodule 5042, be used for the two ends result of reconstructed frequency domain signal is removed, obtain reconstructed frequency domain channel estimating signal.
In the present embodiment, by removing submodule 5042 with the two ends result removal of reconstructed frequency domain signal, the position of this removal is with identical with the position of two ends zero padding by zero padding submodule 5013.
Reconstruct submodule 5043 is used for the pilot signal of reconstructed frequency domain channel estimating signal and interfered cell is carried out multiplying, obtains the frequency domain reception signal after the reconstruct.
Further, as shown in Figure 9, path position acquisition module 502 can comprise in the present embodiment:
Mould prescription module 5021 is used for the time domain channel estimated signal is carried out computing module-square, obtains the channel power spectrum.
First most powerful path obtains submodule 5022, is used for obtaining the most powerful path position of channel power spectrum.
First footpath obtains submodule 5023, is used for obtaining path position according to most powerful path position and the coefficient of efficiency that sets in advance.
As shown in figure 10, this path position acquisition module 502 can also comprise:
First correlation obtains submodule 5024, is used for that the pilot signal that time domain receives is carried out likelihood and estimates, obtains first correlation.
In the present embodiment, first correlation obtains submodule 5024 and can calculate y by formula 7 1It is first correlation, L is the length of the Cyclic Prefix of agreement regulation, the pilot signal that r (x) receives for time domain, k is CP sequence index (being k element of CP sequence), (namely Xiang Guan original position is with respect to the skew of default OFDM symbol 0 position for the relevant offset index of sliding for d, negative value is illustrated in before 0 position, just is being illustrated in after 0 position), N is the data length of an OFDM symbol.
y 1 = | Σ k = 0 L - 1 r ( k + d ) r * ( k + d + N ) | - 1 2 Σ k = 0 L - 1 ( | r ( k + d ) | 2 + | r ( k + d + N ) | 2 ) Formula 7
Second most powerful path obtains submodule 5025, is used for the most powerful path position that obtains interfered cell according to first correlation.
In the present embodiment, second most powerful path obtains submodule 5025 and can obtain most powerful path position, d by formula 8 tBe the most powerful path position.
d t = arg max d y 1 Formula 8
Second footpath obtains submodule 5026, is used for obtaining path position according to most powerful path position and the coefficient of efficiency that sets in advance, and path position is the local maximum of first correlation.
In the present embodiment, second footpath obtains submodule 5026 and can obtain path position by formula 9, and p is path position, and a is the coefficient of efficiency that sets in advance.
p≥d t*a
Formula 9
As shown in figure 11, path position acquisition module in the present embodiment can also comprise:
Second correlation obtains submodule 5027, is used for the pilot signal of time domain reception and the time-domain pilot signal of interfered cell are carried out computing cross-correlation, obtains second correlation.
In the present embodiment, obtain submodule 5027 by second correlation and obtain second correlation, can calculate by formula 10; In order to improve interference elimination performance, can obtain second correlation by formula 5, M is time domain segmentation cumulative number, and s (x) is the time-domain pilot signal of interfered cell, the pilot signal that r (x) receives for time domain, N is the master sync signal sequence length, n is the SCH sequence index, and d is that (relevant original position is with respect to the skew of default master sync signal 0 position, and negative value is illustrated in before 0 position for slip relative offset index, just be illustrated in after 0 position), m is the segments index.
y 2 = | Σ n = 0 N M - 1 r ( m N M + n + d ) s * ( m N M + n ) | Formula
10
In order to overcome the influence of frequency deviation, can obtain second correlation by formula 11, M is time domain segmentation cumulative number, s (x) is time domain master's synchronizing pilot signal of the local interfered cell that generates, time domain master's synchronizing pilot signal that r (x) receives for time domain.
y 2 = Σ m = 0 M - 1 | Σ n = 0 N M - 1 r ( m N M + n + d ) s * ( m N M + n ) | Formula 11
The 3rd most powerful path obtains submodule 5028, is used for the most powerful path position that obtains interfered cell according to second correlation.
The 3rd footpath obtains submodule 5029, is used for obtaining path position according to most powerful path position and the coefficient of efficiency that sets in advance, and path position is the local maximum of second correlation.
In the present embodiment, obtain submodule 5028 and the 3rd by the 3rd most powerful path and directly obtain the process that submodule 5029 obtains path position, directly obtain the similar process that submodule 5026 obtains path position with obtain submodule 5025 and second by second most powerful path, give unnecessary details no longer one by one at this.
In the present embodiment, when at least two of the interfered cells of Serving cell, can at first disturb elimination based on receiving signal to one of them interfered cell by said process, the frequency domain that obtains after first reconstruct receives signal; And then receive signal by the frequency domain of said process after based on first reconstruct another interfered cell is disturbed elimination, the frequency domain that obtains after second reconstruct receives signal; Up to the interference of eliminating all interfered cells by said process.
The device of co-channel interference on the elimination pilot tone that the embodiment of the invention provides by the time domain channel estimated signal zero setting with path position, is reconstructed after obtaining disturbing the time domain channel estimated signal after the elimination, and the frequency domain that obtains after the reconstruct receives signal.Because the energy of interference signal mainly concentrates on the path position place of time domain channel estimated signal, therefore with the time domain channel estimated signal zero setting of path position, can effectively eliminate the interference on the pilot signal, thereby can improve based on the channel estimating of pilot tone or the performance of Time and Frequency Synchronization.The technical scheme that the embodiment of the invention provides has solved in the prior art because the co-channel interference of eliminating on the pilot tone can produce error, causes the problem based on the poor-performing of the channel estimating of pilot tone or Time and Frequency Synchronization.
The method and apparatus of the co-channel interference on the elimination pilot tone that the embodiment of the invention provides can be applied in the ofdm system, for example in the LTE system.The device of the co-channel interference on the elimination pilot tone in the various embodiments of the present invention can be arranged in a wireless receiver or baseband signal processor, described time domain estimation module 501, path position acquisition module 502, the first zero setting module 503 and reconstructed module 504 can be respectively different processor units, be used for carrying out signal by the method for carrying out the embodiment of the invention and handle, with the co-channel interference on the pilot tone in the erasure signal.When described time domain estimation module 501 is processor unit, described signal obtains the input that submodule 5011 can be this processor unit, frequency domain obtain submodule 5012, zero padding submodule 5013 and the first Fourier transform submodule 5014 be respectively applied to the signal that this input is accepted handle obtain interfered cell the time domain channel estimated signal as output.In a kind of specific implementation, described device can comprise: described signal obtains submodule 5011, and it is as an input; Also can comprise processor, described processor can comprise that frequency domain obtains each processor unit such as submodule 5012, zero padding submodule 5013, the first Fourier transform submodule 5014 and path position acquisition module 502, the first zero setting module 503 and reconstructed module 504, and present embodiment is not done restriction to concrete hardware annexation.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.

Claims (14)

1. a method of eliminating the co-channel interference on the pilot tone is characterized in that, comprising:
Interfered cell is carried out time domain channel estimate, obtain the time domain channel estimated signal of described interfered cell;
Obtain the path position of described interfered cell;
With the described time domain channel estimated signal zero setting at described path position place, obtain disturbing the time domain channel estimated signal after the elimination;
Time domain channel estimated signal after described interference eliminated is reconstructed, and the frequency domain that obtains after the reconstruct receives signal.
2. the method for the co-channel interference on the elimination pilot tone according to claim 1 is characterized in that, described described time domain channel estimated signal zero setting with described path position place obtains disturbing the time domain channel estimated signal after the elimination to comprise:
With the described time domain channel estimated signal zero setting of the default number position in described path position and described path position both sides, obtain disturbing the time domain channel estimated signal after the elimination.
3. the method for the co-channel interference on the elimination pilot tone according to claim 1 and 2 is characterized in that, describedly interfered cell is carried out time domain channel estimates, comprising:
Obtain the pilot signal of described interfered cell and the pilot signal that frequency domain receives;
The pilot signal of described frequency domain reception and the pilot signal of described interfered cell are carried out division or conjugation multiplying, obtain the frequency domain channel estimated signal of described interfered cell;
Two ends zero padding with described frequency domain channel estimated signal obtains first signal, and the length of described first signal is 2 integral number power;
Described first signal is carried out inverse Fourier transform.
4. the method for the co-channel interference on the elimination pilot tone according to claim 1 and 2 is characterized in that, described time domain channel estimated signal after described interference is eliminated is reconstructed, and comprising:
Time domain channel estimated signal after the described interference elimination is carried out the frequency domain conversion, obtain the reconstructed frequency domain signal;
The two ends result of described reconstructed frequency domain signal is removed, obtain reconstructed frequency domain channel estimating signal;
The pilot signal of described reconstructed frequency domain channel estimating signal and described interfered cell is carried out multiplying.
5. the method for the co-channel interference on the elimination pilot tone according to claim 1 and 2 is characterized in that, the described path position that obtains described interfered cell comprises:
Described time domain channel estimated signal is carried out computing module-square, obtain the channel power spectrum;
Obtain the most powerful path position of described channel power spectrum;
According to described most powerful path position and the coefficient of efficiency that sets in advance, obtain described path position.
6. the method for the co-channel interference on the elimination pilot tone according to claim 1 and 2 is characterized in that, the described path position that obtains described interfered cell comprises:
The pilot signal that time domain receives is carried out the likelihood estimation, obtain first correlation;
Obtain the most powerful path position of described interfered cell according to described first correlation;
According to described most powerful path position and the coefficient of efficiency that sets in advance, obtain described path position, described path position is the local maximum of described first correlation.
7. the method for the co-channel interference on the elimination pilot tone according to claim 1 and 2 is characterized in that, the described path position that obtains described interfered cell comprises:
The pilot signal of time domain reception and the time-domain pilot signal of described interfered cell are carried out computing cross-correlation, obtain second correlation;
Obtain the most powerful path position of described interfered cell according to described second correlation;
According to described most powerful path position and the coefficient of efficiency that sets in advance, obtain described path position, described path position is the local maximum of described second correlation.
8. a device of eliminating the co-channel interference on the pilot tone is characterized in that, comprising:
The time domain estimation module is used for that interfered cell is carried out time domain channel and estimates, obtains the time domain channel estimated signal of described interfered cell;
The path position acquisition module is for the path position that obtains described interfered cell;
The first zero setting module is used for the described time domain channel estimated signal zero setting with described path position place, obtains disturbing the time domain channel estimated signal after the elimination;
Reconstructed module, the time domain channel estimated signal after being used for described interference eliminated is reconstructed, and the frequency domain that obtains after the reconstruct receives signal.
9. the device of the co-channel interference on the elimination pilot tone according to claim 8 is characterized in that, the described first zero setting module comprises:
The zero setting submodule is used for the described time domain channel estimated signal zero setting with the default number position of described path position and described path position both sides, obtains disturbing the time domain channel estimated signal after the elimination.
10. according to Claim 8 or the device of the co-channel interference on the 9 described elimination pilot tones, it is characterized in that described time domain estimation module comprises:
Signal obtains submodule, is used for obtaining the pilot signal of described interfered cell and the pilot signal that frequency domain receives;
Frequency domain obtains submodule, is used for the pilot signal of described frequency domain reception and the pilot signal of described interfered cell are carried out division or conjugation multiplying, obtains the frequency domain channel estimated signal of described interfered cell;
The zero padding submodule is used for the two ends zero padding with described frequency domain channel estimated signal, obtains first signal, and the length of described first signal is 2 integral number power;
The first Fourier transform submodule is used for described first signal is carried out inverse Fourier transform, obtains the time domain channel estimated signal of described interfered cell.
11. according to Claim 8 or the device of the co-channel interference on the 9 described elimination pilot tones, it is characterized in that described reconstructed module comprises:
The frequency domain transformation submodule is used for the time domain channel estimated signal after the described interference elimination is carried out the frequency domain conversion, obtains the reconstructed frequency domain signal;
Remove submodule, be used for the two ends result of described reconstructed frequency domain signal is removed, obtain reconstructed frequency domain channel estimating signal;
The reconstruct submodule is used for the pilot signal of described reconstructed frequency domain channel estimating signal and described interfered cell is carried out multiplying, obtains the frequency domain reception signal after the described reconstruct.
12. according to Claim 8 or the device of the co-channel interference on the 9 described elimination pilot tones, it is characterized in that described path position acquisition module comprises:
Mould prescription module is used for described time domain channel estimated signal is carried out computing module-square, obtains the channel power spectrum;
First most powerful path obtains submodule, is used for obtaining the most powerful path position of described channel power spectrum;
First footpath obtains submodule, is used for obtaining described path position according to described most powerful path position and the coefficient of efficiency that sets in advance.
13. according to Claim 8 or the device of the co-channel interference on the 9 described elimination pilot tones, it is characterized in that described path position acquisition module comprises:
First correlation obtains submodule, is used for that the pilot signal that time domain receives is carried out likelihood and estimates, obtains first correlation;
Second most powerful path obtains submodule, is used for the most powerful path position that obtains described interfered cell according to described first correlation;
Second footpath obtains submodule, is used for obtaining described path position according to described most powerful path position and the coefficient of efficiency that sets in advance, and described path position is the local maximum of described first correlation.
14. according to Claim 8 or the device of the co-channel interference on the 9 described elimination pilot tones, it is characterized in that described path position acquisition module comprises:
Second correlation obtains submodule, is used for the pilot signal of time domain reception and the time-domain pilot signal of described interfered cell are carried out computing cross-correlation, obtains second correlation;
The 3rd most powerful path obtains submodule, is used for the most powerful path position that obtains described interfered cell according to described second correlation;
The 3rd footpath obtains submodule, is used for obtaining described path position according to described most powerful path position and the coefficient of efficiency that sets in advance, and described path position is the local maximum of described second correlation.
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