CN101174866B - Pilot signal sending method of multi-transmitting antenna system based on orthogonal frequency division multiplexing - Google Patents
Pilot signal sending method of multi-transmitting antenna system based on orthogonal frequency division multiplexing Download PDFInfo
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Abstract
The invention discloses a pilot signal sending method of a multi-transmitting antenna system based on orthogonal frequency division multiplexing, which comprises the steps of dividing N pilot patterns into M pilot pattern groups, and dividing N transmitting antennas into M groups; at an initial moment, a transmitter selects at least one transmitting antenna group, a pilot pattern group is allocated to each selected transmitting antenna group, and the selected transmitting antenna group transmits pilot signals according to the allocated pilot patterns; and at intervals of T, the transmitter reselects at least one transmitting antenna group, reallocates a pilot pattern group for each selected transmitting antenna group and transmits pilot signals according to the allocated pilot pattern by the selected transmitting antenna group. The invention solves the problems of unbalanced signals and complex scheduling of the multiple transmitting antennas, and also considers the pilot frequency overhead and the system performance of the multiple transmitting antenna system.
Description
Technical field
The present invention relates to multi-transmitting antenna system, relate to pilot signal transmission method particularly based on the multiaerial system of orthogonal frequency division multiplexi.
Background technology
Wireless communication technology develops to the direction of broadband wireless access.And for the high power capacity of the high efficiency, two-forty and the system that realize wireless transmission, comprehensive utilization OFDM (OFDM) and multiple-input and multiple-output (MIMO) technology are the selections of following wireless communication technology.
Compare with the single transmit antenna, under the mimo system pilot-frequency expense of multi-transmitting antenna system and performance the compromise be one must not irrespective problem.For pilot-frequency expense and the systematic function of taking into account multi-transmitting antenna system, the pilot-frequency expense of different transmit antennas usually is different.
But the pilot signal that multiple transmit antennas sends different expenses has following drawback:
1. the signal quality of different transmit antennas is uneven.Because the pilot signal expense that different transmit antennas is sent is different; Receiver is to different (receiver is also more accurate to the channel estimating of the signal of the big transmitting antenna of pilot signal expense from the channel estimating quality of different transmit antennas;); Correspondingly, more remarkable from the difference of signal after demodulation of different transmit antennas, this link stability for mimo system, maximum capacity are very disadvantageous;
2. receiver is different to the quality of indicating from the channel quality of different transmit antennas, and this has increased the complexity that transmitter utilizes the channel quality indication to dispatch, and is unfavorable for the realization of system.
For the system that utilizes OFDM (OFDM) and multiple-input and multiple-output (MIMO) technology, a kind of pilot signal distribution method of many antennas is newly proposed, the influence that addresses the above problem is very important.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of pilot signal transmission method of multi-transmitting antenna system of enhancing, with the signal that has solved multiple transmit antennas uneven with the scheduling complicated problems.
For solving the problems of the technologies described above; The present invention provides a kind of pilot signal transmission method of the multi-transmitting antenna system based on OFDM; The antenna amount of said multi-transmitting antenna system is N, adopts N pilot frequency design, the corresponding a kind of expense of each pilot frequency design; The expense of total M kind pilot frequency design is different, and said method comprises the steps:
According to the expense of pilot frequency design, N pilot frequency design is divided into M pilot frequency design group, each pilot frequency design group comprises the identical N/M of an expense pilot frequency design; Accordingly, N transmitting antenna is divided into the M group, every group comprises N/M transmitting antenna;
At initial time, transmitter is that every group of transmitting antenna distributes a pilot frequency design group, and each transmitting antenna in each antenna sets is selected a pilot frequency design in this pilot frequency design group that is assigned with for use; Wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes;
Per interval T, transmitter are each transmitting antenna set of dispense pilot frequency design group again, and each transmitting antenna in each antenna sets is selected a pilot frequency design in this pilot frequency design group that is assigned with for use; Wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes.
Wherein, said transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter are pilot frequency design group different with the current pilot pattern groups of each transmitting antenna set of dispense again.
Wherein, said transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter is designated as pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives.
Wherein, said is the step of a pilot frequency design group different with the current pilot pattern groups of each transmitting antenna set of dispense, comprising:
If the current use pilot frequency design of certain antenna sets group m pilot signal transmitted then distributes constantly at the next one, transmitter comes pilot signal transmitted for this group antenna assignment pilot frequency design group [(m+p) Mod M], wherein, m=0,1,2 ... M-1; P be one greater than 0 but less than the integer of M.
Wherein, said transmitter is indicated through following steps receive channel quality:
Receiver receives the pilot signal from pilot transmitter, utilizes this pilot signal to carry out channel quality measurement, then the channel quality indication is sent to transmitter.
Wherein, said transmitter is designated as the step of a pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives, and comprising:
Transmitter is the little pilot frequency design group of the good transmission antenna group assignment overhead of channel quality.
The present invention and then a kind of pilot signal transmission method of the multi-transmitting antenna system based on OFDM is provided; The antenna amount of said multi-transmitting antenna system is N; Adopt N pilot frequency design; The corresponding a kind of expense of each pilot frequency design, the expense of total M kind pilot frequency design is different, and said method comprises the steps:
According to the expense of pilot frequency design, N pilot frequency design is divided into M pilot frequency design group, each pilot frequency design group comprises the identical N/M of an expense pilot frequency design; Accordingly, N transmitting antenna is divided into the M group, every group comprises N/M transmitting antenna;
At initial time; Transmitter is selected at least one transmission antenna group from M transmission antenna group; Be each selected pilot frequency design group of transmitting antenna set of dispense; Each transmitting antenna in each selected transmission antenna group is selected a pilot frequency design in this pilot frequency design group that is assigned with for use, by the pilot frequency design pilot signal transmitted of the said transmission antenna group that is chosen according to distribution;
Per interval T; Transmitter is selected at least one transmission antenna group from M transmission antenna group again; Again be each selected pilot frequency design group of transmitting antenna set of dispense; Each transmitting antenna in each selected transmission antenna group is selected a pilot frequency design in this pilot frequency design group that is assigned with for use, by the pilot frequency design pilot signal transmitted of the said transmission antenna group that is chosen according to distribution.
Wherein, said transmitter is the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter are each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense again.
Wherein, said transmitter is the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter is designated as each selected pilot frequency design group of transmitting antenna set of dispense according to the channel quality that receives.
Wherein, said step for each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense comprises:
If the current use pilot frequency design of the antenna sets group m pilot signal transmitted that certain is selected then distributes constantly at the next one, transmitter comes pilot signal transmitted for this selected group antenna assignment pilot frequency design group [(m+p) Mod M], wherein, m=0,1,2 ... M-1; P be one greater than 0 but less than the integer of M.
Wherein, said transmitter is indicated through following steps receive channel quality:
Receiver receives the pilot signal from pilot transmitter, utilizes this pilot signal to carry out channel quality measurement, then the channel quality indication is sent to transmitter.
Wherein, said transmitter is designated as the step of each selected pilot frequency design group of transmitting antenna set of dispense according to the channel quality that receives, and comprising:
Transmitter is the little pilot frequency design group of the good transmission antenna group assignment overhead of channel quality.
Adopt method provided by the invention, under the situation that does not increase extra pilot-frequency expense, promptly effectively solved the uneven and scheduling complicated problems of signal of multiple transmit antennas, also take into account the pilot-frequency expense and the systematic function of multi-transmitting antenna system simultaneously.
Description of drawings
Fig. 1 is a kind of sketch map of multiaerial system pilot signal transmitted.
Fig. 2 is the sketch map (open loop approach) according to the multiaerial system pilot signal transmitted of first embodiment of the present invention proposition.
Fig. 3 is the flow chart (closed-loop fashion) according to a multiaerial system pilot signal transmitted of the first embodiment of the present invention.
Embodiment
First embodiment:
Present embodiment proposes a kind of pilot signal transmission method to N (N＞=2) system of transmit antennas, is applicable to the pilot signal expense condition of different that different transmit antennas is sent.For being without loss of generality, N transmitting antenna used antenna 1 respectively, antenna 2... and antenna N.Each transmitting antenna is according to a kind of known pilot frequency design pilot signal transmitted, and every kind of corresponding a kind of expense of pilot frequency design.The expense of total M kind pilot frequency design different mutually (N/M is an integer normally).The pilot sending method that the present invention proposes can be described as:
According to the expense of pilot frequency design, dividing N pilot frequency design is M pilot frequency design group, and each pilot frequency design group comprises N/M pilot frequency design, and the expense of these pilot frequency designs is all identical; Correspondingly, dividing N transmitting antenna is the M group, and every group comprises N/M transmitting antenna.
At initial time (t=0), transmitter is that every group of transmitting antenna distributes a pilot frequency design group.Each transmitting antenna in the antenna sets is selected a pilot frequency design pilot signal transmitted in the pilot frequency design group for use.
Per interval T (T is the cycle that pilot frequency design distributes, and it can be one or more transmission time interval), transmitter is each transmitting antenna set of dispense pilot frequency design group again.Each transmitting antenna is selected a pilot frequency design pilot signal transmitted in the pilot frequency design group for use.Transmitter can be each transmitting antenna set of dispense pilot frequency design group according to one of following dual mode:
Open loop approach: per interval T, transmitter are one of each transmitting antenna set of dispense and the different pilot frequency design group of pilot frequency design group at present again.Such as, establish certain antenna sets use at present pilot frequency design group m pilot signal transmitted (m=0,1,2 ... M-1), then at the next one constantly, transmitter distributes the pilot frequency design group: [(m+P) Mod M] is this antenna sets.Here P be one greater than 0 but less than the integer of M.
Closed-loop fashion: per interval T; Transmitter is designated as each transmitting antenna set of dispense one pilot frequency design group according to the channel quality that receives, and (receiver receives the pilot signal from pilot transmitter; Utilize this pilot signal to carry out channel quality measurement, send to transmitter to the channel quality indication then).Such as: transmitter can be the little pilot frequency design group of the good transmission antenna group assignment overhead of channel quality.Channel quality is good more, and the pilot frequency design group of distribution can be more little.
For ease of profound understanding the present invention, be example with the frame structure shown in the accompanying drawing 1 below, provide some and comprise embodiments of the invention.
The pilot signal that Fig. 1 has provided a kind of multiple transmit antennas based on OFDM technology is sent sketch map, and (frequency pilot sign that antenna 1 sends is in the drawings with there being the rectangle frame of horizontal line shade to represent; The frequency pilot sign that antenna 2 sends is in the drawings with there being the rectangle frame of vertical line shade to represent; The frequency pilot sign that antenna 3 sends is represented with the rectangle frame that right tiltedly line shade is arranged in the drawings; The frequency pilot sign that antenna 4 sends is represented with the rectangle frame that the oblique line in left side shade is arranged in the drawings).In this sketch map; A transmission time interval (TTI) comprises two sub-frame; Each subframe comprises 6 or 7 OFDM symbols (sketch map is 7 OFDM symbols); Frequency pilot sign is arranged in two OFDM symbols (first OFDM symbol and third from the bottom OFDM symbol are called first frequency pilot sign and second frequency pilot sign below respectively) of subframe.The pilot signal that antenna 1/2 sends is the twice of the pilot signal expense of antenna 3/4 transmission in expense.
This figure has also provided four kinds of pilot frequency designs simultaneously, and the rectangle frame that is provided with the horizontal line shade is represented pilot frequency design 1; There is the rectangle frame of vertical line shade to represent pilot frequency design 2; There is the rectangle frame of right tiltedly line shade to represent pilot frequency design 3; There is the rectangle frame of the oblique line in left side shade to represent pilot frequency design 4, can finds out that from this figure pilot frequency design 1 has identical expense with pilot frequency design 2; Pilot frequency design 3 has identical expense with pilot frequency design 4.And the time domain density of pilot frequency design 1/2 is the twice of the time domain density of pilot frequency design 3/4, and corresponding, the expense of pilot frequency design 1/2 also is 2 times of pilot frequency design 3/4 expense.
Use the method that the present invention proposes, according to the expense of pilot frequency design, 4 pilot frequency designs are divided into 2 pilot frequency design groups, and each pilot frequency design group comprises 2 pilot frequency designs, and the expense of these pilot frequency designs is all identical; Correspondingly, dividing 4 transmitting antennas is 2 groups, and every group comprises 2 transmitting antennas.For being without loss of generality, establishing transmitting antenna 1/2 is an antenna sets; Transmitting antenna 3/4 is an antenna sets.If the duration of pilot frequency design is a TTI, accompanying drawing 2 has provided the sketch map (open loop approach) of the multiaerial system pilot signal transmitted of the present invention's proposition, and wherein, the frequency pilot sign that antenna 1 sends is in the drawings with there being the rectangle frame of horizontal line shade to represent; The frequency pilot sign that antenna 2 sends is in the drawings with there being the rectangle frame of vertical line shade to represent; The frequency pilot sign that antenna 3 sends is represented with the rectangle frame that right tiltedly line shade is arranged in the drawings; The frequency pilot sign that antenna 4 sends is represented with the rectangle frame that the oblique line in left side shade is arranged in the drawings.Can find out that from this figure at odd number TTI, antenna sets 1 adopts pilot frequency design group 1 pilot signal transmitted, antenna sets 2 adopts pilot frequency design group 2 pilot signal transmitteds; At even number TTI, antenna sets 1 adopts pilot frequency design group 2 pilot signal transmitteds, and antenna sets 2 adopts pilot frequency design group 1 pilot signal transmitted.Need to prove, in this sketch map, all odd numbers (perhaps even number) TTI; The employing same pilot pattern pilot signal transmitted that transmitting antenna in the antenna sets is always fixing; In fact, this transmitting antenna also can adopt different pilot frequency design pilot signal transmitteds, as long as expense is identical.Both of these case is all contained by claim of the present invention.
Fig. 3 has provided the flow chart (closed-loop fashion) that comprises a multiaerial system pilot signal transmitted of the present invention:
Step 303 channel quality measurement and feedback: receiver receives the pilot signal that transmitter sends, and utilizes this signal to carry out channel quality measurement, feeds back to transmitter to the channel quality indication then.
Step 304 transmitting antenna divides into groups again: transmitter sorts to transmitting antenna according to the quality of channel quality indication, and the transmitting antenna order according to ordering is divided into the M group to transmitting antenna then, and every group comprises N/M transmitting antenna.
Step 305 pilot frequency design is redistributed: per interval T (cycle that the T pilot frequency design distributes), and transmitter is each transmitting antenna set of dispense pilot frequency design group again, channel quality is indicated the less pilot frequency design of set of dispense expense preferably.
Step 306 pilot signal is sent: transmitting antenna is according to the pilot frequency design pilot signal transmitted of distributing.
Repeated execution of steps 303-306.
Second embodiment:
Explanation with reference to above-mentioned first embodiment provides the second embodiment of the present invention below again.
The second embodiment of the present invention provides a kind of pilot signal transmission method of multi-transmitting antenna system of enhancing; The antenna amount of said multi-transmitting antenna system is N; Adopt N pilot frequency design; The corresponding a kind of expense of each pilot frequency design, the expense of total M kind pilot frequency design is different, and said method comprises the steps:
According to the expense of pilot frequency design, N pilot frequency design is divided into M pilot frequency design group, each pilot frequency design group comprises the identical N/M of an expense pilot frequency design; Accordingly, N transmitting antenna is divided into the M group, every group comprises N/M transmitting antenna;
At initial time, transmitter is that every group of transmitting antenna distributes a pilot frequency design group, and each transmitting antenna in each antenna sets is selected a pilot frequency design in this pilot frequency design group that is assigned with for use; Wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes;
Per interval T, transmitter are each transmitting antenna set of dispense pilot frequency design group again, and each transmitting antenna in each antenna sets is selected a pilot frequency design in this pilot frequency design group that is assigned with for use; Wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes.
Equally, transmitter can be each transmitting antenna set of dispense pilot frequency design group according to following open loop and closed loop dual mode:
Open loop approach: per interval T, transmitter are pilot frequency design group different with the current pilot pattern groups of each transmitting antenna set of dispense again.
Closed-loop fashion: per interval T, transmitter is designated as pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives.
Concrete allocation example can repeat no more at this with reference to the explanation of above-mentioned first embodiment.
The main distinction of second embodiment and first embodiment is: no matter be initial time; It still is the later moment of sub-distribution again; After being each transmitting antenna set of dispense pilot frequency design; Second embodiment no longer requires each transmission antenna group according to the pilot frequency design emission pilot signal of distributing; But selected wherein at least one transmission antenna group is according to the pilot frequency design pilot signal transmitted that distributes, and other selected transmission antenna group can be according to the pilot frequency design pilot signal transmitted that distributes, also pilot signal transmitted not.
The 3rd embodiment:
With reference to above-mentioned first, second embodiment, the third embodiment of the present invention is provided below again.
The third embodiment of the present invention provides a kind of pilot signal transmission method of multi-transmitting antenna system of enhancing; The antenna amount of said multi-transmitting antenna system is N; Adopt N pilot frequency design; The corresponding a kind of expense of each pilot frequency design, the expense of total M kind pilot frequency design is different, and said method comprises the steps:
According to the expense of pilot frequency design, N pilot frequency design is divided into M pilot frequency design group, each pilot frequency design group comprises the identical N/M of an expense pilot frequency design; Accordingly, N transmitting antenna is divided into the M group, every group comprises N/M transmitting antenna;
At initial time; Transmitter is selected at least one transmission antenna group from M transmission antenna group; Be each selected pilot frequency design group of transmitting antenna set of dispense; Each transmitting antenna in each selected transmission antenna group is selected a pilot frequency design in this pilot frequency design group that is assigned with for use, by the pilot frequency design pilot signal transmitted of the said transmission antenna group that is chosen according to distribution;
Per interval T; Transmitter is selected at least one transmission antenna group from M transmission antenna group again; Again be each selected pilot frequency design group of transmitting antenna set of dispense; Each transmitting antenna in each selected transmission antenna group is selected a pilot frequency design in this pilot frequency design group that is assigned with for use, by the pilot frequency design pilot signal transmitted of the said transmission antenna group that is chosen according to distribution.
Equally, transmitter can be each selected transmitting antenna set of dispense pilot frequency design group according to following open loop and closed loop dual mode:
Open loop approach: per interval T, transmitter are each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense again.
Closed-loop fashion: per interval T, transmitter is designated as each selected pilot frequency design group of transmitting antenna set of dispense according to the channel quality that receives.
Concrete allocation example can repeat no more at this with reference to the explanation of above-mentioned first embodiment.
The main distinction of the 3rd embodiment and second embodiment is: the 3rd embodiment is each transmitting antenna set of dispense pilot frequency design no longer in advance; And then the selected transmission antenna group that is used to launch pilot signal; But the at first selected transmission antenna group that is used to launch pilot signal, then only to selected transmitting antenna set of dispense pilot frequency design.This has further improved efficient.
Claims (12)
1. pilot signal transmission method based on the multi-transmitting antenna system of OFDM; The antenna amount of said multi-transmitting antenna system is N; Adopt N pilot frequency design; The corresponding a kind of expense of each pilot frequency design, the expense of total M kind pilot frequency design is different, and said method comprises the steps:
According to the expense of pilot frequency design, N pilot frequency design is divided into M pilot frequency design group, each pilot frequency design group comprises the identical N/M of an expense pilot frequency design; Accordingly, N transmitting antenna is divided into the M group, every group comprises N/M transmitting antenna;
At initial time, transmitter is that every group of transmitting antenna distributes a pilot frequency design group, and each transmitting antenna in each antenna sets is selected a pilot frequency design in this pilot frequency design group that is assigned with for use; Wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes;
Per interval T, transmitter are each transmitting antenna set of dispense pilot frequency design group again, and each transmitting antenna in each antenna sets is selected a pilot frequency design in this pilot frequency design group that is assigned with for use; Wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes.
2. the method for claim 1, wherein said transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter are pilot frequency design group different with the current pilot pattern groups of each transmitting antenna set of dispense again.
3. the method for claim 1, wherein said transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter is designated as pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives.
4. method as claimed in claim 2, wherein, said is the step of a pilot frequency design group different with the current pilot pattern groups of each transmitting antenna set of dispense, comprising:
If the current use pilot frequency design of certain antenna sets group m pilot signal transmitted then distributes constantly at the next one, transmitter comes pilot signal transmitted for this group antenna assignment pilot frequency design group [(m+p) Mod M], wherein, m=0,1,2 ... M-1; P be one greater than 0 but less than the integer of M.
5. method as claimed in claim 3, wherein, said transmitter is indicated through following steps receive channel quality:
Receiver receives the pilot signal from pilot transmitter, utilizes this pilot signal to carry out channel quality measurement, then the channel quality indication is sent to transmitter.
6. method as claimed in claim 3, wherein, said transmitter is designated as the step of a pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives, and comprising:
Transmitter is the little pilot frequency design group of the good transmission antenna group assignment overhead of channel quality.
7. pilot signal transmission method based on the multi-transmitting antenna system of OFDM; The antenna amount of said multi-transmitting antenna system is N; Adopt N pilot frequency design; The corresponding a kind of expense of each pilot frequency design, the expense of total M kind pilot frequency design is different, and said method comprises the steps:
According to the expense of pilot frequency design, N pilot frequency design is divided into M pilot frequency design group, each pilot frequency design group comprises the identical N/M of an expense pilot frequency design; Accordingly, N transmitting antenna is divided into the M group, every group comprises N/M transmitting antenna;
At initial time; Transmitter is selected at least one transmission antenna group from M transmission antenna group; Be each selected pilot frequency design group of transmitting antenna set of dispense; Each transmitting antenna in each selected transmission antenna group is selected a pilot frequency design in this pilot frequency design group that is assigned with for use, by the pilot frequency design pilot signal transmitted of the said transmission antenna group that is chosen according to distribution;
Per interval T; Transmitter is selected at least one transmission antenna group from M transmission antenna group again; Again be each selected pilot frequency design group of transmitting antenna set of dispense; Each transmitting antenna in each selected transmission antenna group is selected a pilot frequency design in this pilot frequency design group that is assigned with for use, by the pilot frequency design pilot signal transmitted of the said transmission antenna group that is chosen according to distribution.
8. method as claimed in claim 7, wherein, said transmitter is the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter are each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense again.
9. method as claimed in claim 7, wherein, said transmitter is the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Per interval T, transmitter is designated as each selected pilot frequency design group of transmitting antenna set of dispense according to the channel quality that receives.
10. method as claimed in claim 8, wherein, said step for each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense comprises:
If the current use pilot frequency design of the antenna sets group m pilot signal transmitted that certain is selected then distributes constantly at the next one, transmitter comes pilot signal transmitted for this selected group antenna assignment pilot frequency design group [(m+p) Mod M], wherein, m=0,1,2 ... M-1; P be one greater than 0 but less than the integer of M.
11. method as claimed in claim 9, wherein, said transmitter is indicated through following steps receive channel quality:
Receiver receives the pilot signal from pilot transmitter, utilizes this pilot signal to carry out channel quality measurement, then the channel quality indication is sent to transmitter.
12. method as claimed in claim 9, wherein, said transmitter is designated as the step of each selected pilot frequency design group of transmitting antenna set of dispense according to the channel quality that receives, and comprising:
Transmitter is the little pilot frequency design group of the good transmission antenna group assignment overhead of channel quality.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101377602A CN101174866B (en) | 2006-10-30 | 2006-10-30 | Pilot signal sending method of multi-transmitting antenna system based on orthogonal frequency division multiplexing |
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| CN2006101377602A CN101174866B (en) | 2006-10-30 | 2006-10-30 | Pilot signal sending method of multi-transmitting antenna system based on orthogonal frequency division multiplexing |
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| CN101174866B true CN101174866B (en) | 2012-05-09 |
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| CN101771640B (en) * | 2008-12-31 | 2013-01-16 | 中兴通讯股份有限公司 | Transmission method for dedicated pilot frequency |
| DK3002888T3 (en) | 2010-06-23 | 2017-09-04 | ERICSSON TELEFON AB L M (publ) | HANDLING OF REFERENCE SIGNAL INTERFERENCE IN DEPLOYMENTS OF HETEROGENIC NETWORKS |
| CN103178889B (en) * | 2011-12-24 | 2015-09-30 | 华为技术有限公司 | The method and apparatus that pilot tone sends |
| KR20160098435A (en) * | 2013-12-16 | 2016-08-18 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Pilot signal transmission method, base station, and user device |
| US10243713B2 (en) * | 2015-03-13 | 2019-03-26 | Qualcomm Incorporated | DMRS based DL for low latency |
| WO2023077390A1 (en) * | 2021-11-05 | 2023-05-11 | Nokia Shanghai Bell Co., Ltd. | Positioning enhancement for near-far field scenario |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1476270A (en) * | 2002-08-12 | 2004-02-18 | 华为技术有限公司 | Selection method of transmitting antenna in multiantenna communication environment |
| CN1787506A (en) * | 2004-12-09 | 2006-06-14 | 中兴通讯股份有限公司 | Method for guiding frequency distribution of orthogonal frequency division multiplex system and apparatus thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1476270A (en) * | 2002-08-12 | 2004-02-18 | 华为技术有限公司 | Selection method of transmitting antenna in multiantenna communication environment |
| CN1787506A (en) * | 2004-12-09 | 2006-06-14 | 中兴通讯股份有限公司 | Method for guiding frequency distribution of orthogonal frequency division multiplex system and apparatus thereof |
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