CN101179317A - 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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- CN101179317A CN101179317A CNA2006101385670A CN200610138567A CN101179317A CN 101179317 A CN101179317 A CN 101179317A CN A2006101385670 A CNA2006101385670 A CN A2006101385670A CN 200610138567 A CN200610138567 A CN 200610138567A CN 101179317 A CN101179317 A CN 101179317A
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Abstract
The invention discloses a method for transmitting a pilot signal in a multiple transmit antenna system based on orthogonal division multiplexing, which includes the processes: dividing all the antennas in the multiple transmit antenna system into transmit antenna in a first kind and transmit antenna in a second kind, transmitting pilot symbols which are evenly distributed in a frequency domain with an interval of M sub carriers on a first pilot symbol and a second pilot symbol on each sub frame in a transmitting interval for the transmit antenna in the first kind, and transmitting pilot symbols which are evenly distributed in a frequency domain with an interval of times of the M sub carriers on the first pilot symbol and the second pilot symbol on each sub frame in a transmitting interval for the transmit antenna in the second kind. The invention presents cost saving, high performance and easy implementation.
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 OFDM.
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.
At present, based on the pilot signal transmission method of orthogonal frequency division multiplexi and single transmitting antenna comparative maturity.Accompanying drawing 1 has provided a kind of single transmit antenna pilot signal based on the OFDM technology and has sent schematic diagram (frequency pilot sign is in the drawings with there being the rectangle frame of horizontal line shade to represent).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.Frequency pilot sign has following characteristics: frequency pilot sign is equally distributed at frequency domain, pilot symbol interval be M (in the figure.M=6) individual subcarrier.Being arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign is staggered at frequency domain.
But in the system of comprehensive utilization OFDM (OFDM) and multiple-input and multiple-output (MIMO) technology, how pilot signal transmitted is a relatively problem of difficulty.
A kind of method of launching the multi-antenna pilot signal is the pilot signal transmission method that directly adopts based on the single transmit antenna.The advantage of this method is compatible good with a single aerial system, and the system of being convenient to realizes.Shortcoming is: the expense of pilot signal transmitted is linear increasing along with the increase of the number of transmitting antenna, when the number of transmitting antenna many, such as there being 4 or more for a long time, this expense is intolerable often.Such as the pilot signal expense of single transmit antenna is 5% can receive in general communication system, but expense becomes 20% and just makes us and can't receive during four antennas.
The method of another emission multi-antenna pilot signal is that above a kind of method is the basis, but when number of transmit antennas is many, when being 4 such as number of transmit antennas, the transmission frequency of pilot signal is that half of last a kind of method and the position of pilot signal transmission are subclass that goes up a kind of method.The advantage of this method is that the expense of pilot signal is a kind of littler than last, has also kept the compatibility with a single aerial system simultaneously.Shortcoming is: because pilot signal reduces too much, the accuracy of channel estimating greatly reduces, and the performance of system has been subjected to having a strong impact on.
In sum, for the system that utilizes OFDM (OFDM) and multiple-input and multiple-output (MIMO) technology, propose a kind of pilot signal distribution method of many antennas newly, the performance of taking all factors into consideration expense and system 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 the multi-transmitting antenna system based on orthogonal frequency division multiplexi, to pare down expenses and the elevator system performance.
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 orthogonal frequency division multiplexi, this method comprises:
(1) all antennas with multi-transmitting antenna system are divided into the first kind transmitting antenna and the second class transmitting antenna;
(2) for first kind transmitting antenna, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in Transmission Time Interval, frequency pilot sign evenly distribute on frequency domain, are spaced apart M subcarrier;
(3) for the second class transmitting antenna, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in Transmission Time Interval, frequency pilot sign evenly distribute on frequency domain, and sub-carrier number at interval is the multiple of M.
Wherein, described step (2) also comprises, is arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign and is staggered on frequency domain.
Wherein, described step (3) also comprises, is arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign and is staggered on frequency domain.
Wherein, described step (3) also comprises, between the different subframes in same transmission time interval, is arranged in the frequency pilot sign of first frequency pilot sign or the frequency pilot sign of second frequency pilot sign, is staggered on frequency domain.
Adopt method provided by the invention, taken all factors into consideration accuracy that the overhead channel of multi-transmitting antenna system pilot signal transmitted estimates, with factor such as single transmit antenna system compatibility, it is little to have expense, performance height, plurality of advantages such as realization easily.
Description of drawings
Fig. 1 is the schematic diagram of single transmit antenna system pilot signal transmitted.
Fig. 2 is the schematic diagram according to the multiaerial system pilot signal transmitted of embodiment of the invention proposition.
Fig. 3 is the schematic diagram of the multiaerial system pilot signal transmitted that proposes according to a further embodiment of the invention.
Fig. 4 is the schematic diagram of the multiaerial system pilot signal transmitted that another embodiment proposes according to the present invention.
Embodiment
For the explanation the present invention who is without loss of generality, the number of transmitting antenna is made as N, use antenna 1 respectively, antenna 2... and antenna N represent.Wherein antenna 1 is corresponding to the transmitting antenna in the single transmit antenna system.The pilot sending method that the present invention proposes can be described as:
Transmitting antenna is divided into two classes: transmitting antenna 1...K is a Class1; Transmitting antenna K+1...N is a type 2.K＜N, the representative value of K is N/2.
In same OFDM symbol, antenna 1,2...N adopt the mode pilot symbol transmitted of frequency division multiplexing, that is: when certain antenna on the carrier wave of certain OFDM symbol during pilot symbol transmitted, other antenna does not send any data on the carrier wave of this OFDM symbol.
For the antenna of Class1, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in TTI, frequency pilot sign is equally distributed at frequency domain, pilot symbol interval is M (the individual subcarrier of M＞=N).Being arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign is staggered at frequency domain.
Antenna for type 2.The pattern that following two kinds of pilot signal transmitteds are arranged:
Pattern 1: pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in TTI, frequency pilot sign is equally distributed at frequency domain, pilot symbol interval is the multiple of M subcarrier, is preferably 2M subcarrier.Being arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign is staggered at frequency domain.
Pattern 2: pilot symbol transmitted on first frequency pilot sign of each subframe or second frequency pilot sign in TTI, frequency pilot sign is equally distributed at frequency domain, pilot symbol interval is a M subcarrier.Being arranged in the frequency pilot sign of first frequency pilot sign or the frequency pilot sign of second frequency pilot sign is staggered at frequency domain.
Further, the power of each pilot signal is 2 times of power of each pilot signal in the Class1 in the type 2.
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.
Fig. 2 has provided the schematic diagram that comprises a multiaerial system pilot signal transmitted of the present invention.In this schematic diagram, number of transmit antennas is 4.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 the figure, in same OFDM symbol, antenna 1,2...4 adopt the mode pilot symbol transmitted of frequency division multiplexing.The Class1 antenna comprises antenna 1 and antenna 2; Type 2 antennas comprise antenna 3 and antenna 4.
For the Class1 antenna, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in TTI, frequency pilot sign is equally distributed at frequency domain, pilot symbol interval is the individual subcarrier of M=6 (M=6 is greater than number of transmit antennas 4).Being arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign is staggered at frequency domain.
For type 2 antennas, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in TTI, frequency pilot sign is equally distributed at frequency domain, pilot symbol interval is the individual subcarrier of 2M=12 (M=6 is greater than number of transmit antennas 4).Being arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign is staggered at frequency domain.
Fig. 3 has provided the schematic diagram that comprises another one multiaerial system pilot signal transmitted of the present invention.In this schematic diagram, number of transmit antennas is 4.The Class1 antenna comprises antenna 1 and antenna 2; Type 2 antennas comprise antenna 3 and antenna 4.Difference is: when transmitting antenna 3 is with 4 pilot symbol transmitteds among Fig. 4 among used interlace mode and Fig. 3 transmitting antenna 3 different with 4 used interlace modes.
Fig. 4 has provided the schematic diagram that comprises another one multiaerial system pilot signal transmitted of the present invention.In this schematic diagram, number of transmit antennas is 4.The Class1 antenna comprises antenna 1 and antenna 2; Type 2 antennas comprise antenna 3 and antenna 4.In this schematic diagram, the mode of the antenna transmission pilot signal of Class1 is identical with Fig. 2, Fig. 3 description.For the transmitting antenna of type 2, the first frequency pilot sign pilot symbol transmitted of each subframe in TTI only then, frequency pilot sign is equally distributed at frequency domain, pilot symbol interval is a M subcarrier.Between subframe 1 and subframe 2, the frequency pilot sign that is arranged in first frequency pilot sign is staggered at frequency domain.
Claims (10)
1. pilot signal transmission method based on the multi-transmitting antenna system of OFDM comprises:
(1) all antennas with multi-transmitting antenna system are divided into the first kind transmitting antenna and the second class transmitting antenna;
(2) for first kind transmitting antenna, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in Transmission Time Interval, frequency pilot sign evenly distribute on frequency domain, are spaced apart M subcarrier;
(3) for the second class transmitting antenna, pilot symbol transmitted on first frequency pilot sign of each subframe and second frequency pilot sign in Transmission Time Interval, frequency pilot sign evenly distribute on frequency domain, and sub-carrier number at interval is the multiple of M.
2. the method for claim 1 is characterized in that, described step (2) also comprises, is arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign and is staggered on frequency domain.
3. the method for claim 1 is characterized in that, described step (3) also comprises, is arranged in the frequency pilot sign of first frequency pilot sign and the frequency pilot sign of second frequency pilot sign and is staggered on frequency domain.
4. the method for claim 1, it is characterized in that described step (3) also comprises, between the different subframes in same transmission time interval, be arranged in the frequency pilot sign of first frequency pilot sign or the frequency pilot sign of second frequency pilot sign, on frequency domain, be staggered.
5. the method for claim 1 is characterized in that, described frequency division multiplexing mode is: when on the carrier wave of certain antenna at certain OFDM symbol during pilot symbol transmitted, other antennas do not send any data on this OFDM symbol.
6. the method for claim 1 is characterized in that, the quantity N of described multiple transmit antennas＞=4.
7. the method for claim 1 is characterized in that, the quantity N of described M＞=multiple transmit antennas.
8. the method for claim 1 is characterized in that, the quantity of described first kind transmitting antenna equates with the quantity of the described second class transmitting antenna.
9. the method for claim 1 is characterized in that, for the second class transmitting antenna, the power of each pilot signal is greater than the power of each pilot signal in the first kind transmitting antenna.
10. the method for claim 1 is characterized in that, for the second class transmitting antenna, the power of each pilot signal is 2 times of power of each pilot signal in the first kind transmitting antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101385670A CN101179317A (en) | 2006-11-09 | 2006-11-09 | Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101385670A CN101179317A (en) | 2006-11-09 | 2006-11-09 | Orthogonal frequency division multiplexing based pilot signal transmitting method of multi-transmission antenna system |
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| CN101179317A true CN101179317A (en) | 2008-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006101385670A Withdrawn CN101179317A (en) | 2006-11-09 | 2006-11-09 | 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 |
|---|---|---|---|---|
| CN101841506B (en) * | 2009-03-20 | 2013-05-15 | 富士通株式会社 | Multi-antenna wireless communication system and transmitting method thereof |
| WO2014173292A1 (en) * | 2013-04-23 | 2014-10-30 | 电信科学技术研究院 | Method and device for transmitting pilot signal |
| CN111988074A (en) * | 2019-05-24 | 2020-11-24 | 普天信息技术有限公司 | Downlink pilot frequency method and base station |
-
2006
- 2006-11-09 CN CNA2006101385670A patent/CN101179317A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841506B (en) * | 2009-03-20 | 2013-05-15 | 富士通株式会社 | Multi-antenna wireless communication system and transmitting method thereof |
| WO2014173292A1 (en) * | 2013-04-23 | 2014-10-30 | 电信科学技术研究院 | Method and device for transmitting pilot signal |
| US9948562B2 (en) | 2013-04-23 | 2018-04-17 | China Academy Of Telecommunications Technology | Method and device for transmitting pilot signal |
| CN111988074A (en) * | 2019-05-24 | 2020-11-24 | 普天信息技术有限公司 | Downlink pilot frequency method and base station |
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