CN105591845B - SC-FDMA uplink inter-cell interference suppressing methods based on time-variable filtering - Google Patents
SC-FDMA uplink inter-cell interference suppressing methods based on time-variable filtering Download PDFInfo
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- CN105591845B CN105591845B CN201610130792.3A CN201610130792A CN105591845B CN 105591845 B CN105591845 B CN 105591845B CN 201610130792 A CN201610130792 A CN 201610130792A CN 105591845 B CN105591845 B CN 105591845B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
Abstract
SC FDMA uplink inter-cell interference suppressing methods based on time-variable filtering, are related to mobile communication field.It is to realize effective inhibition to minizone co-channel interference.The present invention introduces snr measurement unit at SC FDMA uplink base stations end, according to the environment signal-to-noise ratio measured, it is determined whether enables time-variable filtering.If enabling time varing filter, base station determines that domain is led in filtering according to the time-frequency distributions and preset filter threshold that receive signal, and carries out time-variable filtering to signal using time-variable filtering unit.It can effectively inhibit SC FDMA uplink medium and small interval co-channel interferences by this method, promote the SINR performances of receiving terminal.The present invention is suitable for the higher environment of signal-to-noise ratio.
Description
Technical field
The present invention relates to mobile communication fields, and in particular to the SC-FDMA uplink channel interferences based on time-variable filtering inhibit
Technology inhibits the minizone co-channel interference of uplink.
Background technology
SC-FDMA is the uplink multi-address cut-in method of 3GPP LTE systems.The cell frequency multiplex factor of SC-FDMA systems
Be 1 so that between same group of subcarrier of neighboring community generate minizone co-channel interference, seriously affect system performance, need into
Row inter-cell interference inhibits.Existing inter-cell interference restraint method includes frequency distribution and power control.Frequency is distributed
Pass through rational frequency planning so that the user in neighboring community edge uses different subcarriers, such as soft frequency to be multiplexed SFR；
Power control is controlled by the transmission power to user so that it is produced under the premise of ensureing that throughput of system requires
Raw interference as small as possible.
According to subcarrier maps mode, SC-FDMA systems can be divided into centralized subcarrier maps mode (LFDMA) and divide
Cloth subcarrier maps mode (IFDMA).By to carrying out Choi- using the SC-FDMA signal of the LFDMA methods of salary distribution
Williams time frequency analysis, it has been found that the time-frequency spectrum of SC-FDMA signal not takes entire subband, and instant bandwidth is at any time
, there is the lower region of some energy in variation.In these low energy areas, useful signal energy very little, and interference and white noise
Energy but be can not ignore.At this point, according to time-variable filtering, time-frequency two-dimensional filter can be carried out according to the Energy distribution of useful signal
Wave can effectively inhibit interference and noise, lifting system Signal to Interference plus Noise Ratio.
Invention content
The present invention be in order to realize effective inhibition to minizone co-channel interference, it is a kind of based on time-variable filtering to provide
SC-FDMA uplink inter-cell interference suppressing methods, it is realized by following steps：
Step 1: the signal received is carried out down coversion for base station and A/D is converted, signal y (n) is obtained；
It is cached Step 2: signal y (n) is sent into buffer, while extracting pilot signal from signal y (n), be sent into letter
It makes an uproar and carries out snr measurement than measuring unit；
If the SNR value measured is not more than predetermined threshold value, snr measurement unit, which is exported control signal, makes buffer
Signal output end is connected with the signal input part of N points DFT, and executes step 5；N is positive integer；
If the SNR value measured is more than predetermined threshold value, snr measurement unit, which is exported control signal, makes time-variable filtering list
The signal output end of member is connected with the signal input part of N points DFT, and executes step 3；
Step 3: the reception signal y (n) cached in buffer, which is sent into filter field determination unit, carries out time frequency analysis,
And filter pass band frequency domain R is determined according to preset filter threshold；
Step 4: according to the filter pass band frequency domain R that step 3 determines, the reception signal y (n) cached in buffer is carried out
Time-variable filtering obtains signal z (n)；
Step 5: if the signal output end of buffer is connected with the signal input part of N points DFT, N is carried out to signal y (n)
Point DFT, then carries out OFDM demodulation, obtains the frequency domain data carried on N number of subcarrier；
If the signal output end of time-variable filtering unit is connected with the signal input part of N points DFT, N is carried out to signal z (n)
Point DFT, then carries out OFDM demodulation, obtains the frequency domain data carried on N number of subcarrier；
Step 6: according to the subcarrier maps position of user UE1, M carrying UE1 user's letter is selected from N number of subcarrier
Number subcarrier on frequency domain data；M is positive integer；
Step 7: carrying out the IDFT transformation of M points to the frequency domain data that step 6 generates, the time domain data of user UE1 is obtained.
The present invention introduces snr measurement unit at SC-FDMA uplink base stations end, according to the environment signal-to-noise ratio measured,
Determine whether to enable time-variable filtering.If enabling time varing filter, base station is according to receiving the time-frequency distributions of signal and preset
Filter threshold determines filter pass band frequency domain, and carries out time-variable filtering to signal using time-variable filtering unit.It can be with by this method
Effectively inhibit SC-FDMA uplink medium and small interval co-channel interferences, promotes the SINR performances of receiving terminal.This method is suitable for noise
Relatively high environment.
Description of the drawings
Fig. 1 is SC-FDMA uplink inter-cell interference model schematics；
Fig. 2 is SC-FDMA signal x1(n) time frequency distribution map；
Fig. 3 is signal x under SNR=10dB1(n) time frequency distribution map after by noise jamming；
Fig. 4 is signal x under SNR=5dB1(n) time frequency distribution map after by noise jamming；
Fig. 5 is the realization principle schematic diagram of the present invention.
Specific implementation mode
Specific implementation mode one, the SC-FDMA uplink inter-cell interference suppressing methods based on time-variable filtering, it by with
Lower step is realized：
Step 1: in base station end, the signal received from antenna obtains signal y by down coversion and A/D converter units
(n)；
It is cached Step 2: y (n) is sent into buffer, while extracting pilot signal from y (n), be sent into snr measurement
Unit carries out snr measurement and illustrates that noise power is larger if the SNR value measured is smaller, at this time due to being obtained from reception signal
The time-frequency distributions of useful signal seriously destroyed by noise, filter can not be used as to lead to domain to useful signal x1(n) had
Effect filtering, snr measurement unit output control signal makes the both ends A, C be connected, and directly executes step 5；If the SNR value measured
It is larger, illustrate that noise power is smaller, it is affected by noise smaller from the time-frequency distributions for receiving the useful signal that signal obtains at this time, it can
To lead to domain to useful signal x as filter1(n) time-variable filtering is carried out, snr measurement unit output control signal makes B, C two
End is connected, and executes step 3.
Step 3: the reception signal y (n) cached in buffer, which is sent into filter field determination unit, carries out time frequency analysis,
And filter pass band frequency domain R is determined according to preset filter threshold.Wherein time frequency analyzing tool can be Fourier's change in short-term
Change the Choi-Williams distributions of STFT or suppressing crossterms.
Step 4: according to the filter pass band frequency domain R that step 3 determines, the reception signal y (n) cached in buffer is carried out
Time-variable filtering obtains z (n).Time-variable filtering process can be linear time-varying (LTV) filter, can also be that can be loaded into filter again
The variable bandwidth filter of wave device coefficient.
If Step 5: the both ends A, C be connected, to signal y (n) carry out N point DFT, if the both ends B, C be connected, to signal z (n) into
Row N point DFT carry out OFDM demodulation, obtain the frequency domain data carried on N number of subcarrier.
Step 6: according to the subcarrier maps position of user UE1, M carrying UE1 user's letter is selected from N number of subcarrier
Number subcarrier on frequency domain data.
Step 7: carrying out the IDFT transformation of M points to the frequency domain data that step 6 generates, the time domain data of user UE1 is obtained.
The present invention proposes a kind of SC-FDMA uplink inter-cell co-channel interference suppressing methods based on time-variable filtering.
In the SC-FDMA systems using centralized sub-carrier distribution manner (LFDMA), the frequency spectrum of each subscriber signal has time-varying special
Property, centre frequency and bandwidth change over time, and not take distributed frequency band always.The present invention proposes a kind of time-varying filter
Wave device structure so that the passband of filter can change with characteristics of signals, realize effective inhibition to minizone co-channel interference.The party
Method is suitable for the higher environment of signal-to-noise ratio.
To the principle of the SC-FDMA uplink inter-cell co-channel interference suppressing methods based on time-variable filtering be described as
Under：System model by UE1 as shown in Figure 1, be wherein sent to the signal of base station BS 1 by the cell from user UE2 and user UE3
Between co-channel interference.Interference model is such as shown in (1).Wherein it is assumed that the reception power that user UE1 reaches base station end is 1, εiIt is interference
The interference factor of user UEi,It is white Gaussian noise.
X in formula (1)1(n) it is SC-FDMA signal, generates process such as shown in (2),
Wherein X1(k) (k=(q-1) * M+1 ..., q*M) is the M point DFT transforms of user UE1 time domain datas to be sent, X1
(k) other point data zero paddings in.M is the subband sub-carrier number that SC-FDMA systems distribute to user UE1, and N is that the total son of system carries
Wave number, then system can be Q=N/M with number of sub-bands.Q is the sub-band number that system distributes to user UE1, q ∈ [1, Q].
Same method can generate x2(n) and x3(n)。
By to signal x1(n) carry out Choi-Williams time frequency analysis, it has been found that the frequency spectrum of SC-FDMA signal with
Time change not takes always entire subband, as shown in Figure 2.The instant bandwidth of SC-FDMA signal changes over time, and occurs
Some energy lower regions.In these low energy areas, useful signal energy very little, and interfering can not with white noise energy
Ignore.At this point, according to time-variable filtering, time-frequency two-dimensional filtering can be carried out according to the Energy distribution of useful signal, can effectively pressed down
System interference and noise, lifting system Signal to Interference plus Noise Ratio.
Fig. 3 and Fig. 4 gives time frequency distribution map of the signal after by noise jamming, and the wherein signal-to-noise ratio of Fig. 3 is 10dB, Fig. 4
Signal-to-noise ratio be 5dB.It can be seen that when noise power is smaller, made an uproar from the time-frequency distributions for receiving the useful signal that signal obtains
Sound shadow sound is smaller, and filter can be used as to lead to domain to useful signal x1(n) time-variable filtering, lifting system performance are carried out.Noise work(
When rate is larger, due to seriously having been destroyed by noise from the time-frequency distributions for receiving the useful signal that signal obtains, filtering can not be used as
Device leads to domain to useful signal x1(n) it is effectively filtered, time varing filter should not be used at this time.
Claims (4)
1. the SC-FDMA uplink inter-cell interference suppressing methods based on time-variable filtering, it is characterized in that：It is by following steps reality
It is existing：
Step 1: the signal received is carried out down coversion for base station and A/D is converted, signal y (n) is obtained；
It is cached Step 2: signal y (n) is sent into buffer, while extracting pilot signal from signal y (n), be sent into signal-to-noise ratio
Measuring unit carries out snr measurement；
If the SNR value measured is not more than predetermined threshold value, snr measurement unit, which is exported control signal, makes the signal of buffer
Output end is connected with the signal input part of N points DFT, and executes step 5；N is positive integer；
If the SNR value measured is more than predetermined threshold value, snr measurement unit, which is exported control signal, makes time-variable filtering unit
Signal output end is connected with the signal input part of N points DFT, and executes step 3；
Step 3: the reception signal y (n) cached in buffer, which is sent into filter field determination unit, carries out time frequency analysis, and root
Filter pass band frequency domain R is determined according to preset filter threshold；
Step 4: according to the filter pass band frequency domain R that step 3 determines, time-varying is carried out to the reception signal y (n) cached in buffer
Filtering, obtains signal z (n)；
Step 5: if the signal output end of buffer is connected with the signal input part of N points DFT, N points are carried out to signal y (n)
Then DFT carries out OFDM demodulation, obtain the frequency domain data carried on N number of subcarrier；
If the signal output end of time-variable filtering unit is connected with the signal input part of N points DFT, N points are carried out to signal z (n)
Then DFT carries out OFDM demodulation, obtain the frequency domain data carried on N number of subcarrier；
Step 6: according to the subcarrier maps position of user UE1, M is selected from N number of subcarrier and carries UE1 subscriber signals
Frequency domain data on subcarrier；M is positive integer；
Step 7: carrying out the IDFT transformation of M points to the frequency domain data that step 6 generates, the time domain data of user UE1 is obtained.
2. the SC-FDMA uplink inter-cell interference suppressing methods according to claim 1 based on time-variable filtering, special
Sign is, time frequency analysis is carried out in step 3 using the Short Time Fourier Transform STFT or Choi-Williams of suppressing crossterms
Distribution is realized.
3. the SC-FDMA uplink inter-cell interference suppressing methods according to claim 2 based on time-variable filtering, special
Sign is in step 4 that time-variable filtering process is realized using linear time-varying filtering device.
4. the SC-FDMA uplink inter-cell interference suppressing methods according to claim 2 based on time-variable filtering, special
Sign is in step 4 that time-variable filtering process is realized using the variable bandwidth filter that can be loaded into filter coefficient again.
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| CN102025662A (en) * | 2010-12-06 | 2011-04-20 | 中兴通讯股份有限公司 | Channel estimation method and device for MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system |
| CN103634259A (en) * | 2013-12-03 | 2014-03-12 | 广东工业大学 | Multi-antenna single carrier wave frequency division multi-address system timing synchronous parallel interference eliminating method |
| CN105162434A (en) * | 2015-09-22 | 2015-12-16 | 哈尔滨工业大学 | Time-variant filtering parameter generating and realizing system and method based on time frequency analysis |
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2016
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| US5995565A (en) * | 1995-10-10 | 1999-11-30 | Nortel Networks Corp | Co-channel interference reduction |
| CN100367677C (en) * | 2001-08-23 | 2008-02-06 | 西门子公司 | Adaptive filtering method and filter for filtering a radio signal in a mobile radio-communication system |
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