CN101184073A - Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system - Google Patents
Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system Download PDFInfo
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- CN101184073A CN101184073A CNA2006101381716A CN200610138171A CN101184073A CN 101184073 A CN101184073 A CN 101184073A CN A2006101381716 A CNA2006101381716 A CN A2006101381716A CN 200610138171 A CN200610138171 A CN 200610138171A CN 101184073 A CN101184073 A CN 101184073A
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Abstract
The invention discloses a transmit method of the pilot signal of a multiple-issue antenna system based on Orthogonal Frequency Division Multiplexity, which is characterized in that N pilot patterns are divided into M pilot pattern groups; the N transmitting antenna are divided into M groups; at the original time, a transmitter distributes a pilot pattern group to each group of transmitting antenna; each transmitting antenna in each antenna group chooses a pilot pattern of the distributed pilot pattern group; wherein, at least one transmitting antenna sends the pilot signal according to the distributed pilot pattern. The invention has the advantages of solving the problems of imbalance and the difficult dispatching of the transmitting antenna signal; simultaneously, the invention considers the pilot frequency overhead and the system performance of the multiple-issue 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 imbalance of different transmit antennas.Because the pilot signal expense difference that different transmit antennas sends, receiver is to (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 difference of different transmit antennas,), correspondingly, the difference of signal after demodulation from different transmit antennas is more remarkable, and this link stability for mimo system, maximum capacity are very disadvantageous;
2. receiver is to the quality difference from the indication of 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, the uneven and scheduling complicated problems with the signal that has solved multiple transmit antennas.
For solving the problems of the technologies described above, the invention provides a kind of pilot signal transmission method of the multi-transmitting antenna system based on OFDM, the antenna amount of described 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 described 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;
Receiver receives the pilot signal that transmitter sends, and utilizes this signal to carry out channel quality measurement, then the channel quality indication is fed back to transmitter;
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;
Every time T, transmitter is 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, described transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is pilot frequency design group different with the current pilot pattern groups of each transmitting antenna set of dispense again.
Wherein, described transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is designated as pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives.
Wherein, described time T is the pilot frequency design assignment period, comprises one or more transmission time intervals.
Wherein, described 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, described 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.
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 schematic diagram of multiaerial system pilot signal transmitted.
Fig. 2 is according to the schematic diagram of the described multiaerial system pilot signal transmitted of the embodiment of the invention (open loop approach).
Fig. 3 is according to the flow diagram of the described multiaerial system pilot signal transmitted of embodiments of the invention (closed-loop fashion).
Embodiment
Embodiment of the present invention proposes a kind of pilot signal transmission method at N (N>=2) system of transmit antennas, is applicable to the different situation of pilot signal expense that different transmit antennas sends.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, wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes, other selected transmission antenna group can be according to the pilot frequency design pilot signal transmitted that distributes, also pilot signal transmitted not.
(T is the cycle that pilot frequency design distributes every time T, 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, wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes, other selected transmission antenna group can be according to the pilot frequency design pilot signal transmitted that distributes, also pilot signal transmitted not.Transmitter can be each transmitting antenna set of dispense pilot frequency design group according to one of following dual mode:
Open loop approach: every time T, transmitter is 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: every time 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, then the channel quality indication is sent to transmitter).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, the present invention is described in further detail.
The pilot signal that Fig. 1 has provided a kind of multiple transmit antennas based on the OFDM technology sends schematic diagram, 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 schematic diagram, a transmission time interval (TTI) comprises two subframes, each subframe comprises 6 or 7 OFDM symbols (schematic diagram 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) 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; Have the rectangle frame of the oblique line in left side shade to represent pilot frequency design 4, as can be seen 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 schematic diagram (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.As can be seen from this figure, at odd number TTI, antenna sets 1 adopts pilot frequency design group 1 pilot signal transmitted, and 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 schematic diagram, 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 diagram (closed-loop fashion) that comprises a multiaerial system pilot signal transmitted of the present invention:
Step 301 transmitting antenna and pilot frequency design initial packet, initial packet: 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.
Step 302 pilot frequency design original allocation: at initial time (t=0), the pilot signal transmission machine 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, wherein has a transmission antenna group at least according to the pilot frequency design pilot signal transmitted that distributes.
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, then the channel quality indication is fed back to transmitter.
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: every time T (T is the cycle that pilot frequency design distributes), transmitter is each transmitting antenna set of dispense pilot frequency design group again, 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.Channel quality is indicated the less pilot frequency design of set of dispense expense preferably.
Step 306 pilot signal sends: transmitting antenna is according to the pilot frequency design pilot signal transmitted of distributing.
Repeated execution of steps 303-306.
Claims (6)
1. pilot signal transmission method based on the multi-transmitting antenna system of OFDM, the antenna amount of described 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 described 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;
Receiver receives the pilot signal that transmitter sends, and utilizes this signal to carry out channel quality measurement, then the channel quality indication is fed back to transmitter;
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;
Every time T, transmitter is 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, described transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is 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, described transmitter is the step of each transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is designated as pilot frequency design group of each transmitting antenna set of dispense according to the channel quality that receives.
4. as claim 1,2 or 3 described methods, described time T is the pilot frequency design assignment period, comprises one or more transmission time intervals.
5. method as claimed in claim 2, described 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.
6. method as claimed in claim 3, described 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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CNA2006101381716A CN101184073A (en) | 2006-11-14 | 2006-11-14 | Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system |
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CNA2006101381716A CN101184073A (en) | 2006-11-14 | 2006-11-14 | Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011003312A1 (en) * | 2009-07-04 | 2011-01-13 | 中兴通讯股份有限公司 | Method for sending middle pilot |
WO2011020342A1 (en) * | 2009-08-18 | 2011-02-24 | 中兴通讯股份有限公司 | Method and system for sending channel measurement pilot frequency |
WO2012159303A1 (en) * | 2011-06-28 | 2012-11-29 | 华为技术有限公司 | Method and apparatus for antenna group allocation in distributed antenna system |
-
2006
- 2006-11-14 CN CNA2006101381716A patent/CN101184073A/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011003312A1 (en) * | 2009-07-04 | 2011-01-13 | 中兴通讯股份有限公司 | Method for sending middle pilot |
US8761128B2 (en) | 2009-07-04 | 2014-06-24 | Zte Corporation | Method for sending a middle pilot |
WO2011020342A1 (en) * | 2009-08-18 | 2011-02-24 | 中兴通讯股份有限公司 | Method and system for sending channel measurement pilot frequency |
RU2518493C2 (en) * | 2009-08-18 | 2014-06-10 | Зте Корпарейшен | Method and system for sending channel measurement reference signal |
US9313677B2 (en) | 2009-08-18 | 2016-04-12 | Zte Corporation | Method and system for sending a channel measurement reference signal |
WO2012159303A1 (en) * | 2011-06-28 | 2012-11-29 | 华为技术有限公司 | Method and apparatus for antenna group allocation in distributed antenna system |
CN103098381A (en) * | 2011-06-28 | 2013-05-08 | 华为技术有限公司 | Method, system and apparatus providing secure infrastructure |
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