CN101291306A - WiMAX compatible systematic pilot design method and channel estimating method based on the pilot - Google Patents
WiMAX compatible systematic pilot design method and channel estimating method based on the pilot Download PDFInfo
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- CN101291306A CN101291306A CNA2007100937828A CN200710093782A CN101291306A CN 101291306 A CN101291306 A CN 101291306A CN A2007100937828 A CNA2007100937828 A CN A2007100937828A CN 200710093782 A CN200710093782 A CN 200710093782A CN 101291306 A CN101291306 A CN 101291306A
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Abstract
The invention relates to a pilot frequency design method for an evolution system of a compatible microwave access global intercommunication WiMAX system. The method is as follows: lead codes of the WiMAX system are used as common pilot frequencies; special pilot frequencies are interpolated according to users; and different users interpolate the special pilot frequencies according to set interpolation proportions. The invention also provides a channel estimation method under the pilot frequency means. The method is as follows: firstly, each receiver utilizes the pilot frequencies to perform channel estimation on subcarrier positions which are provided with common pilot frequencies or special pilot frequencies; prediction rules of a channel in a time slice from the common pilot frequencies to the special pilot frequencies are measured and calculated by utilization of estimation results on positions which are not only provided with the common pilot frequencies but also provided with the special pilot frequencies; prediction is performed on subcarriers between every two predicted value positions by utilization of rules of the two predicted values, and channel estimation of subcarriers in an user area is obtained; or channel estimation values of the user area are predicted on subcarrier positions which are only provided with the common pilot frequencies according to the prediction rules; and channel estimation values of other subcarriers are obtained through interpolation by utilization of the predicted channel estimation values and the obtained estimation results.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of based on the method for designing of the public guide frequency of the wireless system of compatible IEEE802.16e (WiMAX, micro-wave access global inter communication) frequently and dedicated pilot and based on the channel estimation methods of this pilot tone.
Background technology
Based on the demand of smooth evolution and operator, must relate to the problem that on existing system, develops more advanced new wireless communication system, this problem is embodied in the new system design of compatible original system frequently.Shown in Figure 1 is the frame structure schematic diagram of a WiMAX compatible system.Existing system is normally placed Preamble (lead code) at frame head, and inserts dedicated pilot in each OFDM symbol.Such design often can not adapt to the demand of modern system: not enough for high-speed mobile user pilot tone, and cause receiver performance to descend, and for fixing or low speed mobile subscriber, pilot-frequency expense seem too much, can not give play to the spectrum efficiency of system.In addition, present Preamble (lead code) only provides cell IDinformation (cell identity information), a bit waste.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of pilot interposition method, and it is lower to the efficient of the utilization of resources to solve existing pilot interposition method, the problem that can not meet consumers' demand.
The pilot design method of the evolution system of a kind of compatible micro-wave access global inter communication WiMAX system, it is characterized in that: with the lead code of WiMAX system as public guide frequency, dedicated pilot inserts by the user, and different users inserts dedicated pilot according to the insertion ratio of setting.
Further, said method also can have following characteristics: according to user's radio transmission conditions maybe needs set the insertion ratio of dedicated pilot.
Further, said method also can have following characteristics: its dedicated pilot of the user that translational speed is fast or noise jamming is big inserts the user that ratio is slow greater than translational speed or noise jamming is little.
Further, said method also can have following characteristics: less than 1km or fixedly during point-to-point transmission, do not insert dedicated pilot in transmission range.
Further, said method also can have following characteristics: during greater than 60km/h, the ratio of inserting dedicated pilot is 1/7 or 1/8 or 1/10 at user moving speed.
Further, said method also can have following characteristics: during greater than 120km/h, the ratio of inserting dedicated pilot is 1/4 or 1/3 or 1/2 at user moving speed.
Further, said method also can have following characteristics: when described system was many antennas, the public guide frequency of described a plurality of antennas is redesigned, and was orthogonal.
Another technical problem that the present invention will solve provides a kind of channel estimation methods under above-mentioned pilot tone inserted mode.
A kind of channel estimation methods comprises following steps:
(a) each receiver utilizes public guide frequency to carry out channel estimating in the sub-carrier positions with public guide frequency, and the memory channel results estimated;
(b) each receiver sub-carrier positions of having dedicated pilot in user area separately utilizes dedicated pilot to carry out channel estimating, and the memory channel estimated result;
(c) at those existing public guide frequencies, there is the position of dedicated pilot to utilize step (a) again, (b) channel estimation results in calculates from the public guide frequency to the dedicated pilot prediction rule of upper signal channel during this period of time; According to this prediction rule, there is not on the sub-carrier positions of dedicated pilot the subcarrier channel estimation in predictive user district having only public guide frequency; Utilize the sub-carrier channels estimated value of above-mentioned prediction and the channel estimation results of being stored, the channel of other subcarrier of user area is carried out interpolation.
A kind of channel estimation methods comprises following steps:
(a) each receiver utilizes public guide frequency to carry out channel estimating in the sub-carrier positions with public guide frequency, and the memory channel results estimated;
(b) each receiver sub-carrier positions of having dedicated pilot in user area separately utilizes dedicated pilot to carry out channel estimating, and the memory channel estimated result;
(c) at those existing public guide frequencies, there is the position of dedicated pilot to utilize step (a) again, (b) channel estimation results in calculates from the public guide frequency to the dedicated pilot prediction rule of upper signal channel during this period of time; Utilize the rule of these two predicted values to predict to the subcarrier between per two predicted value positions, obtain the channel estimating of this part subcarrier of user area.
The present invention adopts lead code as public guide frequency, insert dedicated pilot by the user, reach preferable laser propagation effect, and propose a kind of method of utilizing public guide frequency and special pilot frequency for user to finish channel estimating jointly, the present invention has the not newly-increased common pilot overhead of following advantages (1); (2) with user be the insertion that unit carries out dedicated pilot, more accurate to the adaptation meeting of wireless channel; (3) strengthened the robustness of channel estimating.
Description of drawings
Fig. 1 is the frame structure schematic diagram of IMT-Adv WiMAX compatible;
Fig. 2 is the pattern schematic diagram of the public guide frequency-Preamble of single antenna of the present invention and many antennas;
Fig. 3 is a channel estimation methods flow chart of the present invention;
Fig. 4 is the schematic diagram that channel estimating is carried out in dedicated pilot of the present invention and public guide frequency combination.
Embodiment
Characteristics of the present invention are to utilize the lead code of original system as public guide frequency, and dedicated pilot inserts according to the user.Different users carries out the insertion of dedicated pilot according to its transmission environment and needs, is aided with public guide frequency, reaches the most effective laser propagation effect.
The present invention utilizes the Preamble (lead code) of original system (being the WiMAX system) as public guide frequency.In the different user's running time-frequency resource district of the aft section of frame structure, the dedicated pilot that carries out different proportion inserts then, and this dedicated pilot still is used for channel estimating.Obviously in the frequency spectrum that WiMAX takies, public guide frequency is that Preamble is a full bandwidth, thereby its channel estimating is effective.And in the user area, pilot tone then only takies the part bandwidth, and still, the pilot density of user area can select to arrange the ratio of pilot tone according to this user's radio transmission conditions, in relatively more static environment, can insert less pilot tone, even can be without dedicated pilot; And in the fast moving environment or disturb when big, can select to insert more pilot tone.Radio transmission conditions can be weighed according to CQI (channel quality indication), also can weigh according to the reception SNR that is calculated by pilot tone, and method is more, is not limited to above-mentioned parameter here.
From the angle of best performance, for example closely (＜1km), fixing point-to-point transmission can be inserted dedicated pilot, and the user who moves for low speed (＜60km/h), can adopt less ratio to insert dedicated pilot for example, evenly the ratio of inserting is 1/7,1/8,1/10 etc.; Move for higher speed that (＞120km/h) user can adopt bigger ratio to mix dedicated pilot (for example 1/4,1/3,1/2 etc.).Insertion ratio of the present invention is not limited to the above-mentioned example that provides.
Carry out channel estimating based on above-mentioned pilot tone, under the single-antenna case, at first each user can utilize Preamble to carry out channel estimating, the dedicated pilot that in each user area then is basis oneself carries out channel estimating, because dedicated pilot is plug-type pilot tone, need carry out the interpolation of frequency domain, (relatively accurately) channel that at this moment can utilize public guide frequency to estimate carries out the time-frequency two-dimensional interpolation, to improve the quality of channel estimating.
Channel estimation methods detailed step of the present invention is as shown in Figure 3:
Step 310: each receiver carries out (full frequency band) channel estimating with public guide frequency earlier, and the memory channel results estimated;
Step 320: each receiver utilizes dedicated pilot to carry out channel estimating in user area separately, and the memory channel estimated result;
Step 330: interpolation, obtain not having the subcarrier channel estimation of pilot tone, concrete grammar is as follows:
(1), there is the position of dedicated pilot to calculate from the public guide frequency to the dedicated pilot prediction rule of upper signal channel during this period of time again at those existing public guide frequencies;
(2) have only public guide frequency and do not have on the subcarrier of dedicated pilot the channel in predictive user district at those;
Concrete forecast method is more, provides a kind of simple method explanation here, with reference to Fig. 4.If forecast model is H
Ded=α H
Pub, utilize the channel estimation results of position 1,3 place's public guide frequency and dedicated pilot, (available least square) can obtain the value of α.And then the forecast model that utilizes the front can obtain the subscriber channel of position 2.Forecasting Methodology of the present invention is not limited to this.The similar understanding of the Forecasting Methodology of back.
(3) utilize the sub-carrier channels estimated value and the step 310 of above-mentioned prediction, each sub-carrier channels results estimated that step 320 obtains is carried out interpolation to the channel of other subcarrier of user area, obtains other subcarrier channel estimation.
In another embodiment of the present invention, step 310,320 is the same, and the interpolation method in the step 330 is as follows: (1) at those existing public guide frequencies, have the position of dedicated pilot to calculate from the public guide frequency to the dedicated pilot prediction rule of upper signal channel during this period of time again;
(2) utilize the rule of these two predicted values to predict to the subcarrier between per two predicted value positions, obtain the channel estimating of this part subcarrier of user area; Thereby finish interpolation process.
Under many antennas situation, the processing method of channel estimating is identical.Just public guide frequency is designed specially, and the public guide frequency on the different antennae should keep quadrature each other.An example of many antennas has two antennas as shown in Figure 2, and its public guide frequency is orthogonal.
Example one
Shown in Figure 4 is to utilize the inventive method to carry out the schematic diagram of channel estimating, if public guide frequency is according to 1,3,5 ... sub-carrier positions arrange, dedicated pilot then is according to 1,5,9,13, ... the position arrangement of subcarrier, so, odd positions can obtain channel by public guide frequency to the prediction of special pilot frequency for user time period (1,5,9 just have special pilot frequency for user), thus utilize this prediction to dope the channel of the user area of even number position.Utilize the estimated result interpolation of the position 1～8 that has just obtained to mend out the channel of other position.
The advantage that the present invention finishes channel estimating jointly with this public guide frequency and special pilot frequency for user is: (1) not newly-increased common pilot overhead; (2) carry out the insertion of dedicated pilot take the user as unit, right The adaptation meeting of wireless channel is more accurate; (3) strengthened the robustness of channel estimating.
Claims (9)
1, the pilot design method of the evolution system of a kind of compatible micro-wave access global inter communication WiMAX system, it is characterized in that: with the lead code of WiMAX system as public guide frequency, dedicated pilot inserts by the user, and different users inserts dedicated pilot according to the insertion ratio of setting.
2, the method for claim 1 is characterized in that: according to user's radio transmission conditions maybe needs set the insertion ratio of dedicated pilot.
3, method as claimed in claim 2 is characterized in that: its dedicated pilot of the user that translational speed is fast or noise jamming is big inserts the user that ratio is slow greater than translational speed or noise jamming is little.
4, method as claimed in claim 2 is characterized in that: less than 1km or fixedly during point-to-point transmission, do not insert dedicated pilot in transmission range.
5, method as claimed in claim 2 is characterized in that: during greater than 60km/h, the ratio of inserting dedicated pilot is 1/7 or 1/8 or 1/10 at user moving speed.
6, method as claimed in claim 2 is characterized in that: during greater than 120km/h, the ratio of inserting dedicated pilot is 1/4 or 1/3 or 1/2 at user moving speed.
7, the method for claim 1 is characterized in that: when described system was many antennas, the public guide frequency of described a plurality of antennas is redesigned, and was orthogonal.
8, a kind of channel estimation methods comprises following steps:
(a) each receiver utilizes public guide frequency to carry out channel estimating in the sub-carrier positions with public guide frequency, and the memory channel results estimated;
(b) each receiver sub-carrier positions of having dedicated pilot in user area separately utilizes dedicated pilot to carry out channel estimating, and the memory channel estimated result;
(c) at those existing public guide frequencies, there is the position of dedicated pilot to utilize step (a) again, (b) channel estimation results in calculates from the public guide frequency to the dedicated pilot prediction rule of upper signal channel during this period of time; According to this prediction rule, there is not on the sub-carrier positions of dedicated pilot the subcarrier channel estimation in predictive user district having only public guide frequency; Utilize the sub-carrier channels estimated value of above-mentioned prediction and the channel estimation results of being stored, the channel of other subcarrier of user area is carried out interpolation.
9, a kind of channel estimation methods comprises following steps:
(a) each receiver utilizes public guide frequency to carry out channel estimating in the sub-carrier positions with public guide frequency, and the memory channel results estimated;
(b) each receiver sub-carrier positions of having dedicated pilot in user area separately utilizes dedicated pilot to carry out channel estimating, and the memory channel estimated result;
(c) at those existing public guide frequencies, there is the position of dedicated pilot to utilize step (a) again, (b) channel estimation results in calculates from the public guide frequency to the dedicated pilot prediction rule of upper signal channel during this period of time; Utilize the rule of these two predicted values to predict to the subcarrier between per two predicted value positions, obtain the channel estimating of this part subcarrier of user area.
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| CN2007100937828A CN101291306B (en) | 2007-04-18 | 2007-04-18 | WiMAX compatible systematic pilot design method and channel estimating method based on the pilot |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800570A (en) * | 2009-02-05 | 2010-08-11 | 中兴通讯股份有限公司 | Method for obtaining channel quality indication (CQI) information |
| CN101997810A (en) * | 2009-08-17 | 2011-03-30 | 大唐移动通信设备有限公司 | Transmission method and device of downlink data of advanced long term evolution system |
| CN101662434B (en) * | 2009-09-27 | 2012-05-02 | 上海大学 | WiMAX channel estimation method designed by utilizing pilot frequency format |
| CN103117784A (en) * | 2011-11-17 | 2013-05-22 | 鼎桥通信技术有限公司 | Method and system improving group descending covering |
| CN104883327A (en) * | 2014-11-21 | 2015-09-02 | 广东省电信规划设计院有限公司 | Channel estimation method and system based on two-dimensional interpolation |
| US9564932B1 (en) | 2015-07-16 | 2017-02-07 | LGS Innovations LLC | Software defined radio front end |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1859056B (en) * | 2005-10-25 | 2010-05-05 | 华为技术有限公司 | Method and device for optimizing pilot frequency in honey comb communication system |
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2007
- 2007-04-18 CN CN2007100937828A patent/CN101291306B/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800570A (en) * | 2009-02-05 | 2010-08-11 | 中兴通讯股份有限公司 | Method for obtaining channel quality indication (CQI) information |
| CN101800570B (en) * | 2009-02-05 | 2013-11-06 | 中兴通讯股份有限公司 | Method for obtaining channel quality indication (CQI) information |
| CN101997810A (en) * | 2009-08-17 | 2011-03-30 | 大唐移动通信设备有限公司 | Transmission method and device of downlink data of advanced long term evolution system |
| CN101997810B (en) * | 2009-08-17 | 2013-03-20 | 电信科学技术研究院 | Transmission method and device of downlink data of advanced long term evolution system |
| CN101662434B (en) * | 2009-09-27 | 2012-05-02 | 上海大学 | WiMAX channel estimation method designed by utilizing pilot frequency format |
| CN103117784A (en) * | 2011-11-17 | 2013-05-22 | 鼎桥通信技术有限公司 | Method and system improving group descending covering |
| CN104883327A (en) * | 2014-11-21 | 2015-09-02 | 广东省电信规划设计院有限公司 | Channel estimation method and system based on two-dimensional interpolation |
| CN104883327B (en) * | 2014-11-21 | 2019-01-08 | 广东省电信规划设计院有限公司 | Channel estimation methods and system based on two-dimensional interpolation |
| US9647705B2 (en) | 2015-07-16 | 2017-05-09 | LGS Innovations LLC | Digital self-interference residual cancellation |
| US9660674B2 (en) | 2015-07-16 | 2017-05-23 | LGS Innovations LLC | Self-interference cancellation antenna systems and methods |
| US9787460B2 (en) | 2015-07-16 | 2017-10-10 | LGS Innovations LLC | Self-interference channel estimation system and method |
| US10090989B2 (en) | 2015-07-16 | 2018-10-02 | LGS Innovations LLC | Software defined radio front end |
| US10164756B2 (en) | 2015-07-16 | 2018-12-25 | LGS Innovations LLC | Self-interference cancellation antenna systems and methods |
| US9564932B1 (en) | 2015-07-16 | 2017-02-07 | LGS Innovations LLC | Software defined radio front end |
| US10574428B2 (en) | 2015-07-16 | 2020-02-25 | LGS Innovations LLC | Self-interference channel estimation system and method |
| US10594469B2 (en) | 2015-07-16 | 2020-03-17 | LGS Innovations LLC | Secure radio methods and apparatus |
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Effective date of registration: 20180103 Address after: 221000 Xuzhou Province, Jiawang District Public Space Industrial Park, room 210 Patentee after: Xuzhou Master Mechanical Technology Co., Ltd. Address before: 518057 Nanshan District high tech Industrial Park, Guangdong, South Road, science and technology, ZTE building, legal department Patentee before: ZTE Corporation |
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Granted publication date: 20111207 Termination date: 20180418 |