CN103379070B - A kind of RE detection methods and device - Google Patents
A kind of RE detection methods and device Download PDFInfo
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- CN103379070B CN103379070B CN201210115364.5A CN201210115364A CN103379070B CN 103379070 B CN103379070 B CN 103379070B CN 201210115364 A CN201210115364 A CN 201210115364A CN 103379070 B CN103379070 B CN 103379070B
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- 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
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
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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
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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
- H04L27/2647—Arrangements specific to the receiver only
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Abstract
The invention discloses a kind of RE detection methods and device, it is related to communication technology, it is determined that at least two neighbouring RE are a RE group, and filter factor is determined by a RE in the RE groups, each RE in the RE groups is filtered using the filter factor, determines testing result.So, for each RE group, all only need to determine a filter factor, reduce the complexity of RE detections.
Description
Technical field
The present invention relates to communication technology, more particularly to a kind of RE detection methods and device.
Background technology
In current OFDM (Orthogonal Frequency Division Multiplexing, OFDM)
In broadband system, it is to support that big bandwidth causes receiver computational processing very big, so as to bring than larger limit to realization
System, is limited to fulfillment capability, and many receivers are difficult to the more excellent algorithm of performance, simultaneously as amount of calculation is high and bring
Receiver energy consumption increases, and chip area is also greatly thing followed problem.
Specifically, OFDM is a kind of transmission method of multicarrier.Frequency band is divided into the transmission of multiple sub-channel parallels for it
Data.Due to its availability of frequency spectrum height, and can be to anti-multipath fading, so being widely used in high-speed radio (wired) communication system
In system, including ADSL/DVB/DAB (Asymmetric Digital Subscriber Line, asymmetrical digital subscriber ring
Road/Digital Video Broadcasting, data video broadcast/Digital Audio Broadcasting, data tones
Frequency is broadcasted) etc. more ripe communication system, and by 802.11 (the Institute of of standard IEEE of WLAN
Electrical and Electronics Engineers, IEEE-USA) serial and ETSI
HiperLan (European Telecommunications Standards Institute HIPERLAN, european telecommunication mark
Zhun Hua associations WLAN (WLAN) agreement) adopt.It is believed that OFDM is a kind of very promising transmission technology.
In an ofdm system, the system based on IFFT/FFT (Fast Fourier Transform Inverse/fast Fourier transform) is realized
Flow process is as shown in figure 1, for input signal carries out serial/parallel conversion, carry out QPSK (Quadrature to the signal after conversion
Phase Shift Keying, QPSK) modulation, IFFT conversion, insertion CP (Cyclic Prefix) process, then to process after
Signal carry out parallel/serial conversion；For the signal of output, serial/parallel conversion is carried out first, the signal after conversion is carried out removing CP
Process, FFT, QPSK demodulation, then parallel/serial conversion is carried out to the signal after demodulation.
As ofdm signal is made up of multiple subcarriers of parallel transmission, so frequency domain Selective intensity and narrow-band impulse are dry
Disturb and only can destroy several subcarriers therein, most of signals remain able to correctly recover, therefore ofdm signal is not
Can be totally disrupted as single-carrier signal, most of subchannels have simply distorted a bit slightly, even if no forward error correction
(FEC) auxiliary, error performance is still better than single-carrier system.
In addition in OFDM technology using the method for insertion CP reducing intersymbol interference, and OFDM has used FFT technique
The division of subchannel is realized, therefore the equilibrium of ofdm communication system is for single-carrier system, can be simple.
The advantage of OFDM technology has：Spectrum efficiency is high, (Inter Symbol Interference, intersymbol do anti-ISI
Disturb) ability is strong.The demand of Future Data business cause necessarily use big bandwidth, now OFDM under common communication condition, than
Traditional DS-CDMA (Direct Sequence-Code Division Multiple Access, direct sequence CDMA)
Advantageously.
At present OFDM technology has application in many fields, using the communication system of ofdm system in, locate inside receiver
Reason includes channel estimation, detects, the process such as decoding.LTE system is a typical communication system using OFDM technology, while
Due to introducing MIMO (Multiple In Multiple Out, multiple-input and multiple-output) technology, the processing procedure of receiver is more
Plus it is complicated.
As shown in Fig. 2 with LTE (Long Term Evolution, Long Term Evolution) it is descending as a example by, give in LTE system
Basic resource structures.In this structure, in time domain, the frame of each LTE is divided into 10 subframes, and each subframe is divided into 2 again
Time slot, each time slot are divided into multiple OFDM symbols again, for each OFDM symbol, are divided into multiple subcarriers in whole bandwidth, that
The single sub-carrier transmitted in each OFDM symbol is a basic resource units (RE, Resource elements),
Here, 1 time slot of time domain is defined, the Resource Block of 180KHz is a PRB on frequency domain, for the receiver of LTE system, is entered
The ultimate unit of row channel estimation and detection is single RE, in the case where descending 20M bandwidth MIMO of LTE is configured to 2*2, is received
Detection needs to process 2400 RE machine every time, and each subcarrier needs independent channel estimation, and carries out independent detection, presses
Scale after this manner, terminal receiver are very high to chip processing capabilities requirement, meanwhile, chip area, the cost that power consumption is brought are asked
Topic is all the problem for needing to face.
In current LTE system, as a result of MIMO technology, in studying at present, commonplace detection algorithm has very
It is many, detect comprising ML (maximum likelihood), ZF (Zero Forcing, ZF) detections, most MMSE (least mean-square error) detections, SD
The detection methods such as (spherical) detection.Wherein, the computational complexity of ML detection methods best performance, but ML detection method is too high, difficult
To apply in practice；And the complexity of the linearity test method such as ZF, MMSE is although relatively low, but poor-performing；It is spherical
Although the non-linear detection algorithms such as SD detections are close to ML detection methods in performance, complexity is very high.
As shown in figure 3, receiver is described by taking descending MMSE detection algorithms as an example carries out data receiver in single sub-carrier
Detailed step：
Step S301, docking collection of letters r carry out CP, obtain signal r1；
Step S302, time-frequency conversion is carried out to r1, obtain data r of frequency domain parallel transmission, the data on each subcarrier
It is expressed as rK, l, wherein k ∈ (0,1 ...., K-1), l ∈ (0,1 ...., L-1)；K determined by transmission bandwidth, for example, 20M bands
Wide lower K=1200；L is the corresponding OFDM symbol number of subframe, and the lower L-value of conventional CP configurations is 14.
Step S303, channel estimation is carried out to pilot tone, obtain channel estimation H under each portP, wherein P is port number；
Step S304, row interpolation is entered to each pilot channel estimation, obtain under whole resource each in each OFDM symbol
The channel estimation of subcarrier
Step S305, carry out Data Detection in units of single RE, by taking MMSE linear detection algorithms as an example, enter according to the following formula
Row is processed：
It is step S306, rightIt is demodulated and soft bit information feeding decoder is entered into row decoding；Obtain final demodulation
Bit information b.
In above-mentioned handling process, what computation complexity was higher is channel estimation and detection part, wherein detect
Amount of calculation is maximum, account for substantially the 70% of all amounts of calculation, after adding MIMO technology, and it is multiply-add and invert to carry out matrix,
Computation complexity is higher, and it is o (N particularly to invert with the increase complexity of reception antenna3), for broadband system, if will
Substantial amounts of subcarrier is processed, it is very high to the performance requirement of hardware, also do not have effectively reduce amount of calculation simultaneously in current industry
And the less scheme of performance loss.
The content of the invention
The embodiment of the present invention provides a kind of RE detection methods and device, to realize reducing the complexity of RE detections.
A kind of RE detection methods, including：
The Resource Unit RE that at least two are closed on is divided into one group, and in per group determines a center RE；
For each RE group, determine the filter factor of center RE, and each RE in the group is carried out according to the filter factor
Filtering, determines testing result.
A kind of RE detection means, including：
Determining unit, the Resource Unit RE at least two are closed on are divided into one group, and in per group determine one
Center RE；
Detector unit, for for each RE group, determining the filter factor of center RE, and according to the filter factor to the group
Interior each RE is filtered, and determines testing result.
The embodiment of the present invention provides a kind of RE detection methods and device, it is determined that at least two neighbouring RE are a RE group,
And filter factor is determined by a RE in the RE groups, each RE in the RE groups is filtered using the filter factor, really
Determine testing result.So, for each RE group, all only need to determine a filter factor, reduce the complexity of RE detections.
Description of the drawings
Fig. 1 be prior art in schematic flow sheet is realized based on the system of IFFT/FFT；
Fig. 2 is LTE system resource schematic diagram in prior art；
Fig. 3 be prior art in receiver single sub-carrier receiving data flow chart；
Fig. 4 is RE detection methods flow chart provided in an embodiment of the present invention；
Fig. 5 is one of RE groups schematic diagram provided in an embodiment of the present invention；
Fig. 6 is flow chart of the receiver provided in an embodiment of the present invention in single sub-carrier receiving data；
Fig. 7 is RE partition methods schematic diagram provided in an embodiment of the present invention；
Fig. 8 a- Fig. 8 c are that RE provided in an embodiment of the present invention detects performance simulation comparison diagram；
Fig. 9 for RE groups schematic diagram provided in an embodiment of the present invention two；
Figure 10 is RE structure of the detecting device schematic diagram provided in an embodiment of the present invention.
Specific embodiment
The embodiment of the present invention provides a kind of RE detection methods and device, it is determined that at least two neighbouring RE are a RE group,
And filter factor is determined by a RE in the RE groups, each RE in the RE groups is filtered using the filter factor, really
Determine testing result.So, for each RE group, all only need to determine a filter factor, reduce the complexity of RE detections.
As shown in figure 4, RE detection methods provided in an embodiment of the present invention include：
Step S401, the Resource Unit RE closed at least two are divided into one group, and in per group determine a center
RE；
Step S402, for each RE group, determine the filter factor of center RE, and according to the filter factor to every in the group
Individual RE is filtered, and determines testing result.
It is due at least including two RE in each RE group, and for each RE group, all only true according to center RE therein
A fixed filter factor, each RE in the group are filtered according to the filter factor, and then reduce amount of calculation, reduce RE inspections
The complexity of survey.
Due between adjacent RE channel difference less, so generally, the filter factor difference of the several RE in a group compared with
It is little, therefore, do not lost to detecting performance substantially using RE detection methods provided in an embodiment of the present invention under common scenarios, only
Have under more severe channel circumstance, detection performance there are some to lose.
As between adjacent RE, channel difference is less, so when RE packets are carried out, it may be determined that composition cross shape
Five RE are a RE group, as shown in figure 5, so, per group in be located at the RE at center and have four RE adjacent thereto.
Now, a center RE is determined in per group, then be specially：It is determined that in five RE of composition cross shape, with which
RE centered on its four RE adjacent RE.
When implementing, as shown in fig. 6, the method for carrying out RE detections is specifically included：
Step S601, docking collection of letters r carry out CP, obtain signal r1；
Step S602, time-frequency conversion is carried out to r1, obtain data r of frequency domain parallel transmission, the data on each subcarrier
It is expressed as rK, l, wherein k ∈ (0,1 ...., K-1), l ∈ (0,1 ...., L-1)；K is determined by transmission bandwidth, such as in 20M bands
Wide lower K=1200；L is the corresponding OFDM symbol number of subframe, is 14 under conventional CP configurations.
Step S603, channel estimation is carried out to pilot tone, obtain channel estimation H under each portP, wherein P is port number；
Step S604, row interpolation is entered to each pilot channel estimation, obtain under whole resource each in each OFDM symbol
The channel estimation of subcarrier
Step S605, according to one RE group of pattern definition of cruciate flower, a cruciate flower RE group as shown in figure 5, its acceptance of the bid
Number for 5 RE centered on RE.Due to the particularity of the pattern of cruciate flower, occur that some RE cannot be with complete at the edge of Resource Block
Whole cruciate flower RE groups occur, as shown in fig. 7, specific RE components prescription is illustrated by taking 2 PRB in the range of dotted line as an example
Formula：It is divided into one group with the pattern of cruciate flower per 5 RE, it is center RE to be designated 5, it is center RE to be designated 1,2,3,4
Adjacent R E, the resource of the PRB edges that in addition UE is taken, it may appear that the center RE of some cruciate flower groups is not present in money
The RE identified with oblique line in situation in source block, such as Fig. 7.
Step S606, according to the order of time domain after first frequency domain, the cruciate flower resource group in UE resources is identified, for
Q-th cruciate flower resource group, according to formulaDetermine the filter factor w of center REq, its
In,The channel estimation value of center RE, k are sequence numbers of the center RE in frequency domain, and l is the sequence number of center RE places OFDM symbol；
Step S607, for RE in q-th cruciate flower resource group, be filtered, calculate testing result；Determine center RE's
Testing result is：
Step S608, the direct filter factor using center RE are filtered to other RE in the group, calculate testing result；
The testing result for determining other RE group Nei is：
After determining testing result, you can further testing result is demodulated and enters soft bit information feeding decoder
Row decoding, obtains final demodulation bit information.
As each cruciate flower RE groups are during filter factor is calculated, the filter factor of center RE is all only calculated, it is right
When in the group, other RE are filtered, using the filter factor, so computation complexity is effectively reduced, so as to big
Reduce greatly the computation complexity of whole receiver.
In due to a cruciate flower RE resource group, the channel estimation and adjacent R E of center RE have very strong dependency, therefore,
Thus the error very little that simplification brings, under general channel circumstance, performance is not lost substantially, only in frequency selectivity and time
Select, under all extremely strong channel circumstance, obvious difference, therefore this simplified algorithm just to be had under higher modulation system
Application is extremely strong in the implementation, and as the amount of calculation of detection part can descend to original 1/4 or so, computation complexity
Having obviously reduces, and is a kind of comparatively ideal implementation.
Link throughput performance comparison figure when Fig. 8 a are EVA5, link throughput performance comparison when Fig. 8 b are EVA30
Figure, link throughput performance comparison figure when Fig. 8 c are ETU30, specific simulation parameter are as shown in table 1：
Table 1
| Simulation parameter | Parameter value |
| Bandwidth | 20MHz |
| Traffic Channel | PDSCH |
| PRB quantity | 10 |
| Channel estimation method | LSMMSE1D |
| Detection algorithm | MMSE |
| Simulated channel | ETU300、EVA5、EPA30 |
| Antenna configurations | 8Tx2Rx DPL_ULA |
| Code word | 1 |
| Transmission mode | TXD |
| CFI | 0 |
| Carrier frequency | 2.6GHz |
| HARQ | YES |
| AMC | YES |
According to simulation result as can be seen that under general channel circumstance (such as EVA5, EPA30), the embodiment of the present invention
It is no performance loss that the RE detection methods of offer are compared with traditional method, under the channel circumstance of very severe (for example：
ETU300), there is certain loss in performance, but totally sees serious, thus, it will be seen that the present invention is that a kind of performance is more excellent,
The stronger simplified algorithm of robustness.
The embodiment of the present invention is illustrated with LTE system in the performance of technical scheme description and scheme, and the present invention is real
Apply the technical scheme of example offer in actual applications, may apply in other OFDM multicarrier systems.
Certainly, in RE detection methods provided in an embodiment of the present invention, when RE packets are carried out, can enter otherwise
Row packet, for example, it may be determined that foursquare nine RE of composition are a RE group, as shown in figure 9, determining that the RE that numbering is 5 is
Center RE, that is, in determining foursquare nine RE of composition, positioned at RE centered on the RE of square center.
The packet mode that those skilled in the art can also provide according to embodiments of the present invention, expands other packet sides
Formula, as long as the RE that at least two are closed on point is one group, and is detected according to RE detection methods provided in an embodiment of the present invention,
Can reduction computation complexity larger in the case of performance loss is less.
The embodiment of the present invention correspondingly provides a kind of RE detection means, as shown in Figure 10, including：
Determining unit 1001, the Resource Unit RE at least two are closed on are divided into one group, and determine in per group
One center RE；
Detector unit 1002, for for each RE group, determining the filter factor of center RE, and according to the filter factor pair
In the group, each RE is filtered, and determines testing result.
Wherein it is determined that the Resource Unit RE that unit 1001 is closed at least two is divided into one group, specifically include：
It is determined that five RE of composition cross shape are a RE group.
Now, determining unit 1001 determines a center RE in per group, specifically includes：
It is determined that in five RE of composition cross shape, RE centered on the RE adjacent with other four RE.
Or, the Resource Unit RE that determining unit 1001 is closed at least two is divided into one group, specifically includes：
It is determined that foursquare nine RE of composition are a RE group.
Now, determining unit 1001 determines a center RE in per group, specifically includes：
It is determined that in foursquare nine RE of composition, positioned at RE centered on the RE of square center.
The embodiment of the present invention provides a kind of RE detection methods and device, it is determined that at least two neighbouring RE are a RE group,
And filter factor is determined by a RE in the RE groups, each RE in the RE groups is filtered using the filter factor, really
Determine testing result.So, for each RE group, all only need to determine a filter factor, reduce the complexity of RE detections.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or with reference to the reality in terms of software and hardware
Apply the form of example.And, the present invention can be using the computer for wherein including computer usable program code at one or more
The computer program implemented in usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) is produced
The form of product.
The present invention be with reference to method according to embodiments of the present invention, equipment (system), and computer program flow process
Figure and/or block diagram are describing.It should be understood that can be by computer program instructions flowchart and/or each stream in block diagram
The combination of journey and/or square frame and flow chart and/or flow process and/or square frame in block diagram.These computer programs can be provided
The processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices
The device of the function of specifying in present one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory is produced to be included referring to
Make the manufacture of device, the command device realize in one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or
The function of specifying in multiple square frames.
These computer program instructions can be also loaded in computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented process, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow process of flow chart or multiple flow processs and/or block diagram one
The step of function of specifying in individual square frame or multiple square frames.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into the had altered of the scope of the invention and change.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (8)
1. a kind of RE detection methods, it is characterised in that include：
The Resource Unit RE that at least two are closed on is divided into one group, and in per group determines a center RE；
For each RE group, determine the filter factor of center RE, and each RE in the group be filtered according to the filter factor,
Determine testing result；
Wherein, it is described that a center RE is determined in per group, specifically include：
For any one RE group, determine minimum with the Euclidean distance sum of other RE RE in the RE groups as center RE；
The Resource Unit RE that at least two are closed on is divided into one group, specifically includes：
It is determined that five RE of composition cross shape are a RE group.
2. the method for claim 1, it is characterised in that described that a center RE is determined in per group, specifically includes：
It is determined that in five RE of composition cross shape, RE centered on the RE adjacent with other four RE.
3. the method for claim 1, it is characterised in that the Resource Unit RE closed at least two is divided into
Group, specifically includes：
It is determined that foursquare nine RE of composition are a RE group.
4. method as claimed in claim 3, it is characterised in that described that a center RE is determined in per group, specifically includes：
It is determined that in foursquare nine RE of composition, positioned at RE centered on the RE of square center.
5. a kind of RE detection means, it is characterised in that include：
Determining unit, the Resource Unit RE at least two are closed on are divided into one group, and in per group determine a center
RE；
Detector unit, for for each RE group, determining the filter factor of center RE, and according to the filter factor to every in the group
Individual RE is filtered, and determines testing result；
Wherein, the determining unit determines a center RE in per group, specifically includes：
For any one RE group, determine minimum with the Euclidean distance sum of other RE RE in the RE groups as center RE；
The Resource Unit RE that the determining unit is closed at least two is divided into one group, specifically includes：
It is determined that five RE of composition cross shape are a RE group.
6. device as claimed in claim 5, it is characterised in that the determining unit determines a center RE, tool in per group
Body includes：
It is determined that in five RE of composition cross shape, RE centered on the RE adjacent with other four RE.
7. device as claimed in claim 5, it is characterised in that the Resource Unit RE that the determining unit is closed at least two
One group is divided into, is specifically included：
It is determined that foursquare nine RE of composition are a RE group.
8. device as claimed in claim 7, it is characterised in that the determining unit determines a center RE, tool in per group
Body includes：
It is determined that in foursquare nine RE of composition, positioned at RE centered on the RE of square center.
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| CN201210115364.5A CN103379070B (en) | 2012-04-18 | 2012-04-18 | A kind of RE detection methods and device |
| PCT/CN2013/072514 WO2013155908A1 (en) | 2012-04-18 | 2013-03-13 | Re detection method and device |
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| CN201210115364.5A CN103379070B (en) | 2012-04-18 | 2012-04-18 | A kind of RE detection methods and device |
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| US10333609B2 (en) | 2014-04-27 | 2019-06-25 | Lg Electronics Inc. | Method of generating transmission signal using preprocessing filter of MIMO transmitter |
| JP6640741B2 (en) * | 2014-05-06 | 2020-02-05 | エルジー エレクトロニクス インコーポレイティド | Method for adaptively using covariance matrix to reduce complexity of MIMO receiver sharing pre-processing filter in group |
| US10182447B2 (en) | 2014-05-08 | 2019-01-15 | Lg Electronics Inc. | Method for processing received signal by forming RE group in MIMO receiver |
| WO2015178599A1 (en) * | 2014-05-22 | 2015-11-26 | 엘지전자 주식회사 | Method by which mimo transmitter forms re group |
| EP3171527B1 (en) * | 2014-07-15 | 2019-06-19 | LG Electronics Inc. | Method by which mimo receiver processes reception signal by aligning plurality of layers by re group unit |
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| US6690791B1 (en) * | 1998-05-08 | 2004-02-10 | Siemens Aktiengesellschaft | Method and array for echo compensation in partial bands |
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| CN101471907A (en) * | 2007-12-28 | 2009-07-01 | 三星电子株式会社 | Pre-coding method of multi-input multi-output system and device using the method |
| CN101964706B (en) * | 2009-07-24 | 2015-05-20 | 中兴通讯股份有限公司 | Pilot frequency multiplexing determination method and device based on hybrid multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6690791B1 (en) * | 1998-05-08 | 2004-02-10 | Siemens Aktiengesellschaft | Method and array for echo compensation in partial bands |
| CN101820301A (en) * | 2010-04-27 | 2010-09-01 | 安徽创毅通信科技有限公司 | Method for generating random access pilot in low complexity in long term evolution system |
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| CN103379070A (en) | 2013-10-30 |
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