CN101184074A - 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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- CN101184074A CN101184074A CNA2006101381720A CN200610138172A CN101184074A CN 101184074 A CN101184074 A CN 101184074A CN A2006101381720 A CNA2006101381720 A CN A2006101381720A CN 200610138172 A CN200610138172 A CN 200610138172A CN 101184074 A CN101184074 A CN 101184074A
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Abstract
The invention discloses a pilot signal sending method for an OFDM-based multiple transmitting antenna system (Orthogonal Furequency Division Multiplexity). The invention is characterized in that N pilot frequency patterns are divided into M groups of pilot frequency patterns, and N transmitting antennas are divided into M groups (N and M represent numbers); at the initial moment, a transmitter chooses at least one transmitting antenna group from M transmitting antenna groups and allocates each fixed transmitting antenna group with one group of pilot frequency patterns; and the fixed transmitting antenna group is responsible for sending the pilot signals according to the allocated pilot frequency patterns; every other T time, the transmitter again selects at least one transmitting antenna group from M transmitting antenna groups and again allocates each fixed transmitting antenna group with one group of pilot frequency patterns; the fixed transmitting antennas group is responsible for sending the pilot signals according to the allocated pilot frequency patterns. The invention has the advantages that the method solves the problems of unbalanced signals and complex dispatch of multiple transmitting antennas and at the same time keeps a low overhead of the multiple transmitting antenna system and excellent system performance.
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:
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 described chosen transmission antenna group 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 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 described chosen transmission antenna group according to the pilot frequency design pilot signal transmitted that distributes.
Wherein, described transmitter is the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense again.
Wherein, described transmitter is the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time 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, described time T is the pilot frequency design assignment period, comprises one or more transmission time intervals.
Wherein, described 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, described 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 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 the embodiment of the invention (closed-loop fashion).
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
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 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 described chosen transmission antenna group according to the pilot frequency design pilot signal transmitted that distributes.
Every time 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 described chosen transmission antenna group according to the pilot frequency design pilot signal transmitted that distributes.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 selected at least one transmission antenna group from M transmission antenna group, is one of each selected transmitting antenna set of dispense and the present different pilot frequency design group of pilot frequency design group.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 selected at least one transmission antenna group from M transmission antenna group again, again (receiver receives the pilot signal from pilot transmitter for each selected pilot frequency design group of transmitting antenna set of dispense, 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 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 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 described chosen transmission antenna group 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 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 described chosen transmission antenna group according to the pilot frequency design pilot signal transmitted that distributes.
2. the method for claim 1, described transmitter are the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is each selected pilot frequency design group different with the current pilot pattern groups of transmitting antenna set of dispense again.
3. the method for claim 1, described transmitter are the step of each selected transmitting antenna set of dispense pilot frequency design group again, comprising:
Every time T, transmitter is designated as each selected pilot frequency design group of 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 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.
6. method as claimed in claim 3, described 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101381720A CN101184074A (en) | 2006-11-14 | 2006-11-14 | Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101381720A CN101184074A (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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| Publication Number | Publication Date |
|---|---|
| CN101184074A true CN101184074A (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101381720A Withdrawn CN101184074A (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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178889A (en) * | 2011-12-24 | 2013-06-26 | 华为技术有限公司 | Method and device for sending pilot frequencies |
| CN104753573A (en) * | 2013-12-31 | 2015-07-01 | 中兴通讯股份有限公司 | Space division multiplexing implementation method, system, base station and terminal |
-
2006
- 2006-11-14 CN CNA2006101381720A patent/CN101184074A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178889A (en) * | 2011-12-24 | 2013-06-26 | 华为技术有限公司 | Method and device for sending pilot frequencies |
| CN103178889B (en) * | 2011-12-24 | 2015-09-30 | 华为技术有限公司 | The method and apparatus that pilot tone sends |
| CN104753573A (en) * | 2013-12-31 | 2015-07-01 | 中兴通讯股份有限公司 | Space division multiplexing implementation method, system, base station and terminal |
| WO2015100939A1 (en) * | 2013-12-31 | 2015-07-09 | 中兴通讯股份有限公司 | Method for realizing space division multiplexing, base station and terminal |
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