CN102594428A - Signal-to-noise ratio feedback method and device - Google Patents
Signal-to-noise ratio feedback method and device Download PDFInfo
- Publication number
- CN102594428A CN102594428A CN2011100049832A CN201110004983A CN102594428A CN 102594428 A CN102594428 A CN 102594428A CN 2011100049832 A CN2011100049832 A CN 2011100049832A CN 201110004983 A CN201110004983 A CN 201110004983A CN 102594428 A CN102594428 A CN 102594428A
- Authority
- CN
- China
- Prior art keywords
- feedback
- signal
- noise ratio
- bits
- length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a signal-to-noise ratio feedback method and a signal-to-noise ratio feedback device and relates to the communication field. The signal-to-noise ratio feedback method and the signal-to-noise ratio feedback device solve the problem that the feedback error of signal-to-noise ratio is larger. The signal-to-noise ratio feedback method comprises the steps of determining the signal-to-noise ratio distribution range of a space-time stream; determining feedback bit, or feedback step or both the feedback bit and the feedback step according to the signal-to-noise ratio distribution range; and adopting the feedback bit to transmit the signal-to-noise ratio of the space-time stream, or adopting the feedback step to transmit the signal-to-noise ratio of the space-time stream, or adopting the feedback bit and the feedback step to transmit the signal-to-noise ratio of the space-time stream. The signal-to-noise ratio feedback method and the signal-to-noise ratio feedback device can be applied in multi-antenna systems such as multiple input multiple output (MIMO) systems.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of signal-noise-ration feedback method and device.
Background technology
(multiple input multiple output, MIMO) in the system, transmitting terminal adopts beam forming technique that data are carried out precoding, flows during through a plurality of sky and gives receiving terminal with said transfer of data at multiple-input and multiple-output.Receiving terminal need to transmitting terminal feed back each stream when empty signal to noise ratio (Signal to Noise Ratio, SNR) so that transmitting terminal different through-put power of flow distribution when be each sky according to said SNR.
In mimo system; Stream was in every carrier signal to noise ratio (PT-SNR) of the average signal-to-noise ratio (SNR_average) of all subcarriers stream when empty etc. when the SNR of stream can comprise sky when empty, and prior art adopts the mode of equal bits number and equal step-length to feed back the SNR that each flows when empty.For example: adopt 8 bits (10dB to 53.75dB), step-length is the SNR_average that the mode of 0.25dB is fed back each stream when empty; Adopt 4 bits (8dB to 7dB), step-length is the PT-SNR that the mode of 1dB is fed back each stream when empty.
Yet, because the SNR difference in dynamic range of stream is bigger when each is empty in the mimo system, adopt the mode of equal bits number and equal step-length to feed back SNR, may cause the problem of feedback overhead waste.For example: according to prior art PT-SNR with 4 bits; Step-length is that 1dB feeds back, and can cover the dynamic range of 16dB, and when MIMO adopts 8 space-time flow transmission; The SNR distribution of first space-time stream is 4.48dB, the dynamic range that can feed back much smaller than standard.
Summary of the invention
Embodiments of the invention provide a kind of signal-noise-ration feedback method and device, can reduce the feedback overhead of signal to noise ratio, save the communication resource that the feedback signal to noise ratio takies.
On the one hand, a kind of signal-noise-ration feedback method is provided, has comprised: the signal to noise ratio distribution of stream when confirming sky; Confirm number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length according to said signal to noise ratio distribution; Adopt said number of bits of feedback to send the said signal to noise ratio of stream when empty, perhaps, adopt said feedback step-length to send the signal to noise ratio of said space-time stream, perhaps, the signal to noise ratio that adopts said number of bits of feedback and feedback step-length to send said space-time stream.
On the other hand, a kind of SNR feedback device in use is provided, has comprised:
First determination module, the signal to noise ratio distribution of stream when being used for confirming sky;
Second determination module is used for confirming number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length according to the signal to noise ratio distribution that said first determination module is confirmed;
Sending module; The number of bits of feedback that is used to adopt said second determination module to confirm is sent the said signal to noise ratio of stream when empty; Perhaps; The feedback step-length that adopts said second determination module to confirm is sent the signal to noise ratio of said space-time stream, perhaps, and the signal to noise ratio that adopts definite number of bits of feedback of said second determination module and feedback step-length to send said space-time stream.
Signal-noise-ration feedback method that the embodiment of the invention provides and device; The signal to noise ratio distribution that flows in the time of can be according to sky is confirmed number of bits of feedback and/or feedback step-length; And adopt this number of bits of feedback and/or feedback step-length to send the said signal to noise ratio of stream when empty, thus reduced the feedback overhead of signal to noise ratio, save the communication resource that the feedback signal to noise ratio takies; Solve prior art and adopted equal bits number and equal step-length feedback signal to noise ratio, the problem that feedback overhead is bigger.
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; Obviously, the 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 signal-noise-ration feedback method flow chart that Fig. 1 provides for the embodiment of the invention;
The SNR feedback device in use structural representation one that Fig. 2 provides for the embodiment of the invention;
The structural representation one of second determination module in the SNR feedback device in use that Fig. 3 provides for the embodiment of the invention shown in Figure 2;
The structural representation two of second determination module in the SNR feedback device in use that Fig. 4 provides for the embodiment of the invention shown in Figure 2;
The SNR feedback device in use structural representation two that Fig. 5 provides for the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, 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 are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
For the bigger problem of feedback error that solves signal to noise ratio, the embodiment of the invention provides a kind of signal-noise-ration feedback method and device.
Present embodiment sends signal to noise ratio, and (Signal-to-noise ratio, method SNR) are that beam receiver (beamformee) is carried out the SNR feedback to beam forming device (beamformer) in wlan system.This flow process is to describe with the handling process of beam receiver.Signal-noise-ration feedback method as shown in Figure 1, that the embodiment of the invention provides comprises:
Wherein, the SNR of stream can comprise when empty: stream is at the average signal-to-noise ratio (SNR_average) of all subcarriers when empty, or every carrier signal to noise ratio (PT-SNR) or the above-mentioned both of stream comprises etc. when empty; Further, in order to save the bit resource that transmission takies, in the present embodiment, PT-SNR flows the difference of the SNR_average that when the actual SNR of each subcarrier and this sky, flows when being empty.The SNR that flows during in the present embodiment, mainly with sky is that PT-SNR is that example describes.
Stream position in the stream when total sky was relevant when the number of stream was with this sky when the SNR dynamic range of stream was with total sky when empty; In multiaerial system (like mimo system); Number of antenna is at most 8; Corresponding when total empty the stream number be 1-8, table 1 show total when empty the stream number be under the situation of 1-8, the SNR distribution of stream size when each is empty.
Table 1: (unit: dB)
In the present embodiment; The number that flows when the flow amount indicating bit was confirmed total sky when the feedback that step 101 can comprise according to the signal to noise ratio feedback request frame of Correspondent Node transmission was empty; Confirm stream when empty in total position in stream when empty according to sending the aerial position of stream when empty, according to total when empty the number of stream when empty stream in total SNR distribution that flows when the location lookup table 1 in the stream is confirmed this sky when empty.
In the present embodiment; Bits of original number and the initial step length of the SNR that flows in the time of can being provided for feeding back sky in advance; Present embodiment is 4 with the bits of original number; Initial step length is that 1dB is that example describes, and in the use of reality, can also be set to other numerical value according to communication requirement bits of original number and initial step length, repeats no more here.
Then further; Step 102 confirms that according to the SNR distribution concrete steps of number of bits of feedback can comprise: at first; Obtain the initial step length of the SNR that flows when being used to feed back sky, then, confirm number of bits of feedback according to initial step length and SNR distribution; Particularly, present embodiment can adopt following formula (1) to confirm number of bits of feedback:
Wherein, x is the SNR distribution, and z is initial step length (z=1 in the present embodiment), and b is a number of bits of feedback.
In the present embodiment, if the number of space-time stream is N, N be more than or equal to 2 and smaller or equal to 8 integer, then the number of bits of feedback B={b that flows of all space-times
i}
I=N, wherein, b
iBe i the corresponding number of bits of feedback of space-time stream, and all b
iDo not equate entirely.
The SNR number of bits of feedback of stream was as shown in table 2 when each that stream SNR distribution is obtained when adopting empty shown in above formula (1) and the table 1 was empty.
Table 2: (unit: bit)
And/or; Further, step 102 confirms that according to the SNR distribution concrete steps of feedback step-length can comprise: at first, obtain the bits of original number of the SNR that flows when being used to feed back sky; Then; Confirm the feedback step-length according to bits of original number and SNR distribution, particularly, present embodiment can adopt following formula (2) to confirm number of bits of feedback:
Wherein, x is the SNR distribution, and a is that (in the present embodiment, a=4), d is the feedback step-length to the bits of original number.
In the present embodiment, if the number of space-time stream is N, N be more than or equal to 2 and smaller or equal to 8 integer, then the feedback step-length D={d that flows of all space-times
i}
I=N, wherein, d
iBe i the corresponding number of bits of feedback of space-time stream, and all d
iDo not equate entirely.
The SNR feedback step-length of stream was as shown in table 3 when each that stream SNR distribution is obtained when adopting empty shown in above formula (2) and the table 1 was empty.Need to prove that the feedback step-length shown in the table 3 quantizes result afterwards for the feedback step-length that formula (2) is obtained.
Table 3: (unit: dB)
Need to prove that in the present embodiment, step 102 both can only be made amendment to original bit number or original step-length according to the SNR distribution, also can all make amendment to original bit number and original step-length according to the SNR distribution.
Whether need to revise in order to make step 102 can judge original bit number and/or original step-length exactly, alternatively, can also comprise the step of obtaining the feedback system control information before the step 102.Wherein, the feedback system control information is used to indicate the rule change of number of bits of feedback and feedback step-length.
Present embodiment can the pre-configured feedback system control information in this locality, also can receive the feedback system control information of being sent by Correspondent Node.Present embodiment does not limit the concrete form of feedback system control information, in the use of reality, can adopt any attainable form to represent this feedback system control information.For example: can represent the feedback system control information with 2 bits, wherein, the 1st bit is used to represent the rule change of number of bits of feedback; When this bit is 1; Expression is confirmed the feedback bits position according to the SNR distribution, and when this bit was 0, expression feedback bits position was the bits of original position; The 2nd bit is used to represent to feed back the rule change of step-length, and when this bit was 1, expression was confirmed the feedback step-length according to the SNR distribution, and when this bit was 0, expression feedback step-length was an initial step length.Every kind of situation is not given unnecessary details one by one here.
Then this moment, step 102 can be according to SNR distribution and feedback system control information, confirm number of bits of feedback with/feed back step-length.
Need to prove; If step 102 has been confirmed number of bits of feedback or has been fed back step-length according to the SNR distribution; The SNR of stream when then step 103 adopts number of bits of feedback and original step-length to send sky, perhaps, the SNR of stream when step 103 adopts original bit number and the transmission of feedback step-length empty.
The signal-noise-ration feedback method that the embodiment of the invention provides; The signal to noise ratio distribution that flows in the time of can be according to sky is confirmed number of bits of feedback and/or feedback step-length; And adopt this number of bits of feedback and/or feedback step-length to send the said signal to noise ratio of stream when empty, thus reduced the feedback overhead of signal to noise ratio, save the communication resource that the feedback signal to noise ratio takies; Solve prior art and adopted equal bits number and equal step-length feedback signal to noise ratio, the problem that feedback overhead is bigger
Further, as shown in table 3, the technical scheme that provides when the embodiment of the invention is according to the SNR distribution; Confirm the feedback step-length, and adopt in the time of to feed back step-length feedback SNR, improved the precision of feedback SNR; Make that system feedback SNR is more accurate, and then improved the feedback performance of system.
The feedback of average signal-to-noise ratio also can be handled according to above-mentioned method.
Be that beam receiver is carried out the SNR feedback to Beam-former in wlan system.In single user's multiaerial system (SU-MIMO), beam receiver both can be that access point (AP) also can be a work station (station), and Beam-former both can be that access point also can be a work station.In MU-MIMO, beam receiver is a work station, and Beam-former is an access point.The SNR feedback device in use of the embodiment of the invention can be beam receiver.
As shown in Figure 2, the embodiment of the invention also provides a kind of SNR feedback device in use, comprising:
Wherein, the SNR of stream can comprise when empty: when empty stream at the average signal-to-noise ratio (SNR_average) of all subcarriers, and/or when empty stream in every carrier signal to noise ratio (PT-SNR) etc.; Further, in order to save the bit resource that transmission takies, in the present embodiment, PT-SNR flows the difference of the SNR_average that when the actual SNR of each subcarrier and this sky, flows when being empty.The SNR that flows during in the present embodiment, mainly with sky is that PT-SNR is that example describes.
Sending module 203; The signal to noise ratio of stream when being used to adopt second determination module, 202 definite number of bits of feedback to send sky; Perhaps; The signal to noise ratio that adopts second determination module, 202 definite feedback step-lengths to send said space-time stream, perhaps, the number of bits of feedback that adopts second determination module 202 to confirm is sent the signal to noise ratio that said space-time flows with the feedback step-length.
Further, as shown in Figure 3, second determination module 202 can comprise:
First obtains submodule 2021, is used to obtain be used to feed back the said initial step length of the signal to noise ratio of stream when empty;
First confirms submodule 2022, is used for obtaining the signal to noise ratio distributions that initial step length that submodule 2021 obtains and first determination module 201 confirm according to first and confirms number of bits of feedback.
Further, as shown in Figure 4, second determination module 202 can comprise:
Second obtains submodule 2023, is used to obtain the bits of original number of the signal to noise ratio that flows when being used to feed back sky;
Second confirms submodule 2024, is used for obtaining the signal to noise ratio distributions that bits of original number that submodule 2023 obtains and first determination module 201 confirm according to second and confirms the feedback step-length.
As shown in Figure 5, the SNR feedback device in use that the embodiment of the invention provides can also comprise:
Need to prove; In the use of reality; More than the SNR feedback device in use that provides to the embodiment of the invention shown in Figure 5 like Fig. 2 a plurality of modules of dividing, can not give unnecessary details through a module or a functional module realization that has similar functions with said a plurality of modules here yet.
The concrete implementation method of the SNR feedback device in use that the embodiment of the invention provides can be said referring to the signal-noise-ration feedback method that the embodiment of the invention provides, and repeats no more here.
The SNR feedback device in use that the embodiment of the invention provides; The signal to noise ratio distribution that flows in the time of can be according to sky is confirmed number of bits of feedback and/or feedback step-length; And adopt this number of bits of feedback and/or feedback step-length to send the said signal to noise ratio of stream when empty, thus reduced the feedback overhead of signal to noise ratio, save the communication resource that the feedback signal to noise ratio takies; Solve prior art and adopted equal bits number and equal step-length feedback signal to noise ratio, the problem that feedback overhead is bigger
The signal-noise-ration feedback method that the embodiment of the invention provides can be applied in as in the multiaerial systems such as MIMO with device.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules 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; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by said protection range with claim.
Claims (12)
1. a signal-noise-ration feedback method is characterized in that, comprising:
The moving distribution of the signal to noise ratio of stream when confirming sky;
Confirm number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length according to said signal to noise ratio distribution;
Adopt said number of bits of feedback to send the said signal to noise ratio of stream when empty, perhaps, adopt said feedback step-length to send the signal to noise ratio of said space-time stream, perhaps, the signal to noise ratio that adopts said number of bits of feedback and feedback step-length to send said space-time stream.
2. method according to claim 1 is characterized in that, saidly confirms that according to said signal to noise ratio distribution number of bits of feedback comprises:
Obtain and be used to feed back the said initial step length of the signal to noise ratio of stream when empty;
Confirm number of bits of feedback according to said initial step length and said signal to noise ratio distribution.
3. method according to claim 2 is characterized in that, saidly confirms that according to said initial step length and said signal to noise ratio distribution number of bits of feedback comprises:
According to said initial step length z and said signal to noise ratio distribution x, according to formula
Confirm number of bits of feedback b.
4. method according to claim 1 is characterized in that, saidly confirms that according to said signal to noise ratio distribution the feedback step-length comprises:
Obtain and be used to feed back the said bits of original number of the signal to noise ratio of stream when empty;
Confirm the feedback step-length according to said bits of original number and said signal to noise ratio distribution.
5. method according to claim 4 is characterized in that, saidly confirms that according to said bits of original number and said signal to noise ratio distribution the feedback step-length comprises:
Count a and said signal to noise ratio distribution x according to said bits of original, according to formula
Confirm feedback step-length d.
6. method according to claim 1 is characterized in that, also comprises:
Obtain the feedback system control information, said feedback system control information is used to indicate the rule change of number of bits of feedback and feedback step-length;
Then saidly confirm that according to said signal to noise ratio distribution number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length are:
According to said signal to noise ratio distribution and said feedback system control information, confirm number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length.
7. according to any described method of claim 1-6, it is characterized in that, said when empty the signal to noise ratio of stream comprise: said when empty stream at the average signal-to-noise ratio SNR_average of all subcarriers, and/or said every carrier signal to noise ratio PT-SNR of stream when empty.
8. according to any described method of claim 1-6, it is characterized in that,
If comprise N space-time stream, the said number of bits of feedback of then said employing send said when empty the signal to noise ratio of stream comprise: sending the number of bits of feedback that signal to noise ratio adopted that i space-time flows is b
i, and b
I-1≤b
i, all b
iDo not equate entirely that wherein, N is more than or equal to 2 and smaller or equal to 8 integer, i is more than or equal to 2 and smaller or equal to the integer of N; Or,
If comprise N space-time stream, the signal to noise ratio that the said feedback step-length of then said employing is sent said space-time stream comprises: the feedback step-length that signal to noise ratio adopted of sending i space-time stream is d
i, and d
I-1≤d
i, all d
iDo not equate entirely that wherein, N is more than or equal to 2 and smaller or equal to 8 integer, i is more than or equal to 2 and smaller or equal to the integer of N.
9. a SNR feedback device in use is characterized in that, comprising:
First determination module, the signal to noise ratio distribution of stream when being used for confirming sky;
Second determination module is used for confirming number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length according to the signal to noise ratio distribution that said first determination module is confirmed;
Sending module; The number of bits of feedback that is used to adopt said second determination module to confirm is sent the said signal to noise ratio of stream when empty; Perhaps; The feedback step-length that adopts said second determination module to confirm is sent the signal to noise ratio of said space-time stream, perhaps, and the signal to noise ratio that adopts definite number of bits of feedback of said second determination module and feedback step-length to send said space-time stream.
10. device according to claim 9 is characterized in that, said second determination module comprises:
First obtains submodule, is used to obtain be used to feed back the said initial step length of the signal to noise ratio of stream when empty;
First confirms submodule, is used for obtaining the signal to noise ratio distribution that initial step length that submodule obtains and said first determination module confirm according to said first and confirms number of bits of feedback.
11. device according to claim 9 is characterized in that, said second determination module comprises:
Second obtains submodule, is used to obtain be used to feed back the said bits of original number of the signal to noise ratio of stream when empty;
Second confirms submodule, is used for obtaining bits of original number and the definite definite feedback of the signal to noise ratio distribution step-length of said first determination module that submodule obtains according to said second.
12. device according to claim 9 is characterized in that, also comprises:
Acquisition module is used to obtain the feedback system control information, and said feedback system control information is used to indicate the rule change of number of bits of feedback and feedback step-length;
Said second determination module, number of bits of feedback or feedback step-length or number of bits of feedback and feedback step-length are confirmed in the feedback system control information that signal to noise ratio distribution that also is used for confirming according to said first determination module and said acquisition module obtain.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110004983.2A CN102594428B (en) | 2011-01-11 | 2011-01-11 | Signal-to-noise ratio feedback method and device |
| PCT/CN2011/080307 WO2012094907A1 (en) | 2011-01-11 | 2011-09-28 | Method and device for signal to noise ratio feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110004983.2A CN102594428B (en) | 2011-01-11 | 2011-01-11 | Signal-to-noise ratio feedback method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102594428A true CN102594428A (en) | 2012-07-18 |
| CN102594428B CN102594428B (en) | 2015-01-21 |
Family
ID=46482670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110004983.2A Expired - Fee Related CN102594428B (en) | 2011-01-11 | 2011-01-11 | Signal-to-noise ratio feedback method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102594428B (en) |
| WO (1) | WO2012094907A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1832369A (en) * | 2005-03-12 | 2006-09-13 | 中兴通讯股份有限公司 | Transmitting method, device and system for multiple input-output comunication system |
| US20090316610A1 (en) * | 2008-06-19 | 2009-12-24 | Daniel Yellin | Balancing capacity between link directions using variable feedback rates |
| CN101754343A (en) * | 2008-12-18 | 2010-06-23 | 华为技术有限公司 | Channel transmission quality feedback method, system and device |
| CN101868018A (en) * | 2010-07-15 | 2010-10-20 | 华中科技大学 | Method for allocating low-bit feedback user frequencies of MIMO |
-
2011
- 2011-01-11 CN CN201110004983.2A patent/CN102594428B/en not_active Expired - Fee Related
- 2011-09-28 WO PCT/CN2011/080307 patent/WO2012094907A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1832369A (en) * | 2005-03-12 | 2006-09-13 | 中兴通讯股份有限公司 | Transmitting method, device and system for multiple input-output comunication system |
| US20090316610A1 (en) * | 2008-06-19 | 2009-12-24 | Daniel Yellin | Balancing capacity between link directions using variable feedback rates |
| CN101754343A (en) * | 2008-12-18 | 2010-06-23 | 华为技术有限公司 | Channel transmission quality feedback method, system and device |
| CN101868018A (en) * | 2010-07-15 | 2010-10-20 | 华中科技大学 | Method for allocating low-bit feedback user frequencies of MIMO |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102594428B (en) | 2015-01-21 |
| WO2012094907A1 (en) | 2012-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2726850C2 (en) | System and method of transmitting subset selection information | |
| CN101675602B (en) | Method and arrangement for adapting a multi-antenna transmission | |
| US8594218B2 (en) | Method of transmitting a precoding matrix in a multi-input multi-output (MIMO) system | |
| CN102119492B (en) | Method and apparatus for supporting distributed MIMO in a wireless communication system | |
| CN101383647B (en) | Method and device for calibrating operation antenna | |
| EP3780443A1 (en) | Channel state information reporting method and device, and channel state information receiving method and device | |
| CN103782533B (en) | Method for determining precoding matrix indicator, user equipment and base station | |
| CN101032109B (en) | A method of processing received signals in a multi-input multi-output (MIMO) system | |
| US8175184B2 (en) | Method for transmitting beam forming information and a method for tracking position of a mobile station in multi input multi output system using codebook-based beam forming scheme | |
| CN101517922B (en) | Beamforming method, system and device | |
| CN101969363B (en) | Channel state information feedback method and terminal | |
| CN102291228B (en) | Channel state information feedback and receiving methods and equipment | |
| US20070249401A1 (en) | Method for transmitting data in a communication system | |
| CN110635883B (en) | Information feedback method and device, storage medium and electronic device | |
| CN102668434A (en) | Multi-granular feedback reporting and feedback processing for precoding in telecommunications | |
| US8442140B2 (en) | Method of designing codebook for network multiple input multiple output communication system and method of using the codebook | |
| CN102550079A (en) | Asymmetrical feedback for coordinated transmission systems | |
| CN101582712B (en) | Method for realizing precoding and method for generating precoding matrices | |
| CN105637773A (en) | Transmit antenna selection | |
| CN108809391A (en) | Determine method, receiving device and the sending device of pre-coding matrix instruction | |
| US20110045782A1 (en) | Devices and methods for transmitting and receiving data using precoding matrix | |
| WO2012014064A2 (en) | A method and device for obtaining precoding matrix | |
| JP2012514877A (en) | Dynamic feedback channel information transmitting apparatus and method in MIMO system | |
| CN101183890A (en) | Code book based CQI feedback method for multi-user precoding system | |
| CN104303442B (en) | Feedback method, receiving terminal and the transmitting terminal of pre-coding matrix instruction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20160111 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |