CN101527699A - Self-adapting pilot frequency dispensing device and self-adapting pilot frequency dispensing method in OFDMA system - Google Patents
Self-adapting pilot frequency dispensing device and self-adapting pilot frequency dispensing method in OFDMA system Download PDFInfo
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Abstract
The invention provides a self-adapting pilot frequency dispensing device and a self-adapting pilot frequency dispensing method in an OFDMA system. A transmitting end comprises a pilot frequency configuration determination module, a pilot frequency power determination module and a pilot frequency dispenser, wherein the pilot frequency configuration determination module is used for selecting corresponding pilot frequency configurations from preset pilot frequency configurations and sending the corresponding pilot frequency configurations to the pilot frequency dispenser according to the speed grade of a terminal and channel condition; the pilot frequency power determination module is used for determining a corresponding pilot frequency power according to the distance between the terminal and the transmitting end and sending the corresponding pilot frequency power to the pilot frequency dispenser; and the pilot frequency dispenser is used for carrying out pilot frequency distribution adaptively for different terminals according to the related information sent by the pilot frequency configuration determination module and the pilot frequency power determination module. The device and the method give comprehensive consideration to the self-adaptation of the pilot frequency configuration and the pilot frequency power, reduce the consumption of the pilot frequency power, and improve the estimated performance of a whole channel.
Description
Technical field
The present invention relates to moving communicating field, adaptive pilot distributor and method in the particularly a kind of OFDMA system.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing Access, OFDM) technology and advance to have more (Multiple-Input Multiple-Out-put more, MIMO) technology is the super third generation (the Beyond Third Generation of system, B3G) system and fourth-generation system (Forth Generation, 4G) mainstream technology that is adopted in the evolution process.The MIMO-OFDM system that two kinds of technology combine has both advantages concurrently.Wherein, the MIMO technology can improve the capacity of system effectively, improves the performance of system, can also improve the coverage of network and the reliability of transmission significantly; And the OFDM technology also has been subjected to common attention because of characteristics such as its anti-multipath delay character that has, anti-frequency selective fading and high spectrum utilization.The MIMO-OFDM system resolves into one group of parallel flat fading channel to frequency selective fading channels by OFDM modulation, and utilizes MIMO to improve the capacity of channel, becomes the core solution of future mobile.
In the MIMO-OFDM system,, need carry out channel estimating in order to characterize the state of mimo channel.Usually the method that adopts is pilot signal transmitted and relevant signaling, and receiving terminal can utilize known pilot frequency information and relevant signaling that channel is estimated.Fixedly pilot tone can satisfy fixed-line subscriber, low speed user and higher translational speed user's requirement.But for high-speed mobile user (for example more than the 350km/h), then will increase the quantity of pilot tone, the increase of pilot number will inevitably cause the reduction of the availability of frequency spectrum.For the contradiction between the balance pilot number and the availability of frequency spectrum, each company has proposed the thought of adaptive pilot design.
For example, number of patent application is that 09800406.2 Chinese patent application " is used for distributing in the orthogonal frequency division multiple access system self adaptation method and apparatus of pilot tone ", number of patent application is 200410088876.2 Chinese patent application " method that adaptive pilot inserts in the ofdm system " and number of patent application is 200580031388.0 Chinese patent application " adaptive pilot inserts in the MIMO-OFDM system ".
Wherein, No. 03800406.2 Chinese patent application has the following disadvantages: in this patent, what adopt on pilot frequency configuration adaptively selected is to compare with pre-set threshold, but definite relatively difficulty of threshold value, do not give the concrete foundation of determining in the patent, in the pilot tone adaptive process, only considered the self adaptation of pilot frequency configuration, do not consider the self adaptation of pilot power.
No. 200410088876.2 Chinese patent application has the following disadvantages: in this patent, though provided adaptive foundation of pilot tone and implementation, do not consider the self adaptation of pilot power.
No. 200580031388.0 Chinese patent application has the following disadvantages: the pilot tone self-adapting distribution method that this piece patent is proposed is only applicable to 802.11 systems, and range of application has certain limitation, and does not consider the self adaptation of pilot frequency configuration.
Summary of the invention
The objective of the invention is to, the adaptive pilot distributor in a kind of OFDMA system is provided, take all factors into consideration the self adaptation of pilot frequency configuration and the self adaptation of pilot power;
Another object of the present invention is to, the adaptive pilot distribution method in a kind of OFDMA system is provided, take all factors into consideration the self adaptation of pilot frequency configuration and the self adaptation of pilot power.
Adaptive pilot distributor in the OFDMA of the present invention system, comprise at transmitting terminal: pilot frequency configuration determination module, pilot power determination module, and pilot frequency distribution device, wherein, described pilot frequency configuration determination module, pilot frequency configuration is sent to the pilot frequency distribution device to be used for selecting correspondingly according to the speed class of terminal and channel status from pre-set pilot frequency configuration; Described pilot power determination module is used for determining that according to the distance of terminal and transmitting terminal correspondingly pilot power is sent to the pilot frequency distribution device; Described pilot frequency distribution device is used for the relevant information of sending according to described pilot frequency configuration determination module and described pilot power determination module, for different terminals carries out pilot frequency distribution adaptively.
Wherein, described pilot frequency configuration determination module, comprise channel status and moving speed estimation device, and pilot number and position determiner, wherein, described channel status and moving speed estimation device are used for according to the pilot signal of each subchannel current channel condition and translational speed being estimated, and estimated result are sent to pilot number and position determiner; Described pilot number and position determiner are used for determining according to the estimated result of channel status and speed estimator the quantity and the position of pilot tone, then pilot number and the positional information of determining are sent to described pilot frequency distribution device.
Wherein, described pilot frequency configuration determination module is used to channel status user preferably, distributes less pilot frequency configuration, is the relatively poor user of channel status, distributes more pilot frequency configuration.
In addition, described pilot power determination module comprises distance estimations device, pilot power determiner, and wherein, described distance estimations device is used for the distance between user terminal and base station is measured, and measurement result is sent to the pilot power determiner; Described pilot power determiner is used for described measurement result and pre-set threshold that the distance estimations device measures are compared, and determines pilot power according to comparative result, and the pilot power information of determining is sent to the pilot frequency distribution device.
Wherein, described pilot power determination module is used for actual range d and the pre-set threshold d that will measure
0Compare, if between a certain user and base station apart from d＞d
0, then to increase this user's pilot power; Otherwise, if d＜d
0, then to reduce corresponding pilot power.
Adaptive pilot distribution method in the OFDMA of the present invention system comprises the following steps:
Steps A: receiving terminal is selected correspondingly pilot frequency configuration according to the speed class and the channel status of terminal from pre-set pilot frequency configuration, and determines correspondingly pilot power according to the distance of terminal and transmitting terminal;
Step B: pilot frequency configuration and pilot power according to the selection in the steps A are that different terminals carries out pilot frequency distribution adaptively.
Wherein, in described steps A, speed class and channel status according to terminal are selected correspondingly pilot frequency configuration from pre-set pilot frequency configuration, comprise the following steps: current channel condition and translational speed to be estimated, and determine the quantity and the position of pilot tone according to estimated result according to the pilot signal of each subchannel.
In addition, in described steps A, described pilot tone join for, to channel status user preferably, distribute less pilot frequency configuration, to the relatively poor user of channel status, distribute more pilot frequency configuration.
Further, in described steps A, determine correspondingly pilot power according to the distance of terminal and transmitting terminal, comprise the following steps: the distance between terminal and base station is measured, and measurement result and pre-set threshold compared, determine pilot power according to comparative result.
Wherein, described definite correspondingly pilot power is actual range d and the pre-set threshold d that will measure
0Compare, if between a certain user and base station apart from d＞d
0, then to increase this user's pilot power; Otherwise, if d＜d
0, then to reduce corresponding pilot power.
The invention has the beneficial effects as follows: according to adaptive pilot distributor and the method in the OFDMA of the present invention system, translational speed and distance between the base station and channel status according to the user, for the user who is in good sub-channel environment distributes less pilot tone and pilot power, thereby reduce pilot power consumption; For the user who is in low bad channel circumstance distributes more pilot tone and pilot power, take all factors into consideration the self adaptation of pilot frequency configuration and the self adaptation of pilot power, improved the overall channel estimation performance.
Description of drawings
Fig. 1 is the schematic diagram of the adaptive pilot distributor of the embodiment of the invention;
Fig. 2 is the operational flowchart that is used to receive adaptive pilot of the embodiment of the invention;
Fig. 3 is the adaptive pilot distribution method flow chart in the OFDMA of the present invention system;
Fig. 4 is the flow chart of the adaptive pilot distribution method of the embodiment of the invention.
Embodiment
Below, 1～4 adaptive pilot distributor and the method for describing in detail in the OFDMA of the present invention system with reference to the accompanying drawings.
Core concept of the present invention is: because the configuration of pilot tone is directly connected to accuracy of channel estimation, pilot number is too much, can cause the waste of frequency spectrum resource, therefore in order to make performance for estimating channel more accurate, do not waste simultaneously too much frequency spectrum resource again, best mode is exactly to distribute pilot frequency configuration and the pilot power that adapts to it for each user.
Selection for pilot frequency configuration, best pilot frequency configuration is selected according to the speed class and the channel status of each terminal in the base station from pre-set pilot frequency configuration, be channel status user preferably, distribute less pilot frequency configuration, be the relatively poor user of channel status, distribute more pilot frequency configuration, pilot frequency configuration can design according to conditions such as different channel statuss and translational speeds, all is known for transmitting-receiving two-end.
And for the determining of pilot power, because pilot signal power usually will be much larger than the power of data-signal, so the power of pilot signal directly affects coverage, and still, pilot power is excessive also can to cause interference to the minizone.In order to satisfy the requirement of channel estimating, the user nearer for the distance base station can distribute less pilot power, and for distance base station user far away, then will distribute bigger pilot power.
As shown in Figure 1, schematic diagram for the adaptive pilot distributor of the embodiment of the invention, in this embodiment, transmitting terminal according to from the relevant feedback information of the preceding guide of a plurality of user terminals in the ofdma communication system to each subchannel self adaptation distribution pilot tone.Particularly, this device comprises pilot frequency configuration determination module, pilot power determination module, and the pilot frequency distribution device.
Wherein, the pilot frequency configuration determination module, pilot frequency configuration is sent to the pilot frequency distribution device to be used for selecting correspondingly according to the speed class of terminal and channel status from pre-set pilot frequency configuration, for example, be channel status user preferably, distribute less pilot frequency configuration, be the relatively poor user of channel status, distribute more pilot frequency configuration;
The pilot power determination module is used for determining that according to the distance of terminal and transmitting terminal correspondingly pilot power is sent to the pilot frequency distribution device;
The pilot frequency distribution device is used for sending to corresponding user according to the relevant information that pilot frequency configuration determination module and pilot power determination module send, thereby realizes the pilot tone self adaptation between different terminals.
Further, the pilot frequency configuration determination module comprises channel status and moving speed estimation device, and pilot number and position determiner.Wherein, channel status and moving speed estimation device are used for according to the pilot signal of each subchannel current channel condition and translational speed being estimated, and this estimated result are sent to pilot number and position determiner; Pilot number and position determiner are used for determining according to the estimated result of channel status and speed estimator the quantity and the position of pilot tone.
Further, the pilot power determination module comprises distance estimations device, pilot power determiner.Wherein, the distance estimations device is used for the distance between user terminal and base station is measured, and measurement result is sent to the pilot power determiner; The pilot power determiner, this actual measured results and the pre-set threshold that are used for the distance estimations device is measured compare, and the result after the comparison is sent to the pilot frequency distribution device.For example, with the actual range d and the pre-set threshold d that measure
0Compare, if between a certain user and base station apart from d＞d
0, then to increase this user's pilot power; Otherwise, if d＜d
0, then to reduce corresponding pilot power.
In addition, need to prove that above-mentioned pilot frequency configuration is predefined according to friction speed grade and channel conditions at transmitting terminal, can select the proper pilot configuration for different terminals adaptively according to feedback information and metrical information; Pilot power can be set at the function of base station and user terminal distance, also can pre-set several values, use apart from d and threshold value d
0Compare, select adaptively.After terminal is determined proper pilot configuration and pilot power, just can carry out pilot frequency distribution adaptively for different terminals.
In addition, based on as mentioned above, carrying out translational speed, channel status, and between terminal and base station during the measurement of distance, when the TDD mode, because the symmetry of up-downgoing channel, transmitting terminal can directly utilize uplink information to know down channel characteristic and velocity information; Under the FDD mode, terminal can report transmitting terminal with translational speed and the channel condition information that measures by feedback channel, the mode that translational speed reports has a lot, the simplest mode is the feedback speed grade, as representing low speed (10km/h is following) with 00, with 10 represent middling speed (10～120km/h), with 01 represent at a high speed (120～350km/h), represent ultrahigh speed (more than the 350km/h) with 11.Simultaneously, the base station will be measured the distance between user terminal and base station, can carry out the measurement of distance based on the sounding signal.
As shown in Figure 2, be the operational flowchart that is used to receive adaptive pilot of the embodiment of the invention, when from a base station, receiving in the processing at Fig. 1, use with the pilot frequency configuration and the power related information that are used for described base station and carry out this operation.In Fig. 2, user terminal will receive the subchannel that comprises with relevant information such as the quantity of pilot tone of distributing to this terminal and position and data, and detects the quantity and the position of pilot tone, extracts pilot frequency information and also carries out channel estimating.And as required metrical information is reported transmitting terminal.
As shown in Figure 3, be the adaptive pilot distribution method flow chart in the OFDMA of the present invention system, this method comprises the following steps:
Step 100: terminal is to current speed class and the channel status of transmitting terminal feedback;
Step 200: the distance between each terminal of base station measurement and base station;
Step 300: according to the speed class of terminal and the pilot frequency configuration that channel status is selected and this terminal adapts;
Step 400: according to the pilot transmit power that distance is selected and this terminal adapts between terminal and base station;
Step 500: by determining good pilot frequency configuration and transmitting power, in each user's data, insert corresponding pilot frequency information, insert the packet of pilot frequency information for the terminal emission.
Fig. 4 is the flow chart of the adaptive pilot distribution method of the embodiment of the invention.As shown in Figure 4, quantity and the position of determining pilot tone according to the translational speed grade and the channel condition information of terminal, base station.If f (v, snr)＜f
1, then adopt the bigger pilot frequency configuration of pilot interval 1, if f
1≤ f (v, snr)≤f
2, then adopt the moderate pilot frequency configuration of pilot interval 2, if f (v, snr)＞f
2, then adopt the less pilot frequency configuration of pilot interval 3.Simultaneously, with record apart from d and pre-set threshold value d
0Compare, and determine the transmitting power of pilot tone according to result relatively.The distribution ratio of pilot power is more flexible, but also can bring a lot of problems, as the interference of minizone, power source etc.The simplest mode can be provided with two performance number P that are suitable for the different distance scope
1, P
2P
1＜P
2, as d＜d
0The time, pilot power is set to P
1Otherwise, then be set to P
2The pilot frequency distribution device sends to corresponding user together according to the information of the pilot power that the pilot number that receives from pilot number and position determiner and position and pilot power determiner are determined.Wherein, f
1, f
2, f
3Be three predetermined threshold value; (v is snr) for representing the function of translational speed grade and signal condition for f.Say simply, when big and signal to noise ratio is big when speed, then reduce pilot number and position; Otherwise, then increase pilot number and position.
In sum, according to adaptive pilot distributor and the method in the OFDMA of the present invention system, according to user's translational speed and distance between the base station and channel status,, thereby reduce pilot power consumption for the user who is in good sub-channel environment distributes less pilot tone and pilot power; For the user who is in low bad channel circumstance distributes more pilot tone and pilot power, take all factors into consideration the self adaptation of pilot frequency configuration and the self adaptation of pilot power, improved the overall channel estimation performance.
More than be in order to make those of ordinary skills understand the present invention; and to detailed description that the present invention carried out; but can expect; in the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.
Claims (10)
1. the adaptive pilot distributor in the OFDMA system is characterized in that, comprises at transmitting terminal: pilot frequency configuration determination module, pilot power determination module, and pilot frequency distribution device, wherein,
Described pilot frequency configuration determination module, pilot frequency configuration is sent to the pilot frequency distribution device to be used for selecting correspondingly according to the speed class of terminal and channel status from pre-set pilot frequency configuration;
Described pilot power determination module is used for determining that according to the distance of terminal and transmitting terminal correspondingly pilot power is sent to the pilot frequency distribution device;
Described pilot frequency distribution device is used for the relevant information of sending according to described pilot frequency configuration determination module and described pilot power determination module, for different terminals carries out pilot frequency distribution adaptively.
2. the adaptive pilot distributor in the OFDMA as claimed in claim 1 system is characterized in that described pilot frequency configuration determination module comprises channel status and moving speed estimation device, and pilot number and position determiner, wherein,
Described channel status and moving speed estimation device are used for according to the pilot signal of each subchannel current channel condition and translational speed being estimated, and estimated result are sent to pilot number and position determiner;
Described pilot number and position determiner are used for determining according to the estimated result of channel status and speed estimator the quantity and the position of pilot tone, then pilot number and the positional information of determining are sent to described pilot frequency distribution device.
3. the adaptive pilot distributor in the OFDMA as claimed in claim 2 system is characterized in that described pilot frequency configuration determination module, be used to channel status user preferably, distribute less pilot frequency configuration, be the relatively poor user of channel status, distribute more pilot frequency configuration.
4. the adaptive pilot distributor in the OFDMA as claimed in claim 1 system is characterized in that described pilot power determination module comprises distance estimations device, pilot power determiner, wherein,
Described distance estimations device is used for the distance between user terminal and base station is measured, and measurement result is sent to the pilot power determiner;
Described pilot power determiner is used for described measurement result and pre-set threshold that the distance estimations device measures are compared, and determines pilot power according to comparative result, and the pilot power information of determining is sent to the pilot frequency distribution device.
5. the adaptive pilot distributor in the OFDMA as claimed in claim 4 system is characterized in that described pilot power determination module is used for actual range d and the pre-set threshold d that will measure
0Compare, if between a certain user and base station apart from d＞d
0, then to increase this user's pilot power; Otherwise, if d＜d
0, then to reduce corresponding pilot power.
6. the adaptive pilot distribution method in the OFDMA system is characterized in that, comprises the following steps:
Steps A: receiving terminal is selected correspondingly pilot frequency configuration according to the speed class and the channel status of terminal from pre-set pilot frequency configuration, and determines correspondingly pilot power according to the distance of terminal and transmitting terminal;
Step B: pilot frequency configuration and pilot power according to the selection in the steps A are that different terminals carries out pilot frequency distribution adaptively.
7. the adaptive pilot distribution method in the OFDMA as claimed in claim 6 system, it is characterized in that, in described steps A, from pre-set pilot frequency configuration, select correspondingly pilot frequency configuration according to the speed class and the channel status of terminal, comprise the following steps:
Pilot signal according to each subchannel is estimated current channel condition and translational speed, and is determined the quantity and the position of pilot tone according to estimated result.
8. the adaptive pilot distribution method in the OFDMA as claimed in claim 7 system is characterized in that, in described steps A, described pilot tone join for, to channel status user preferably, distribute less pilot frequency configuration, to the relatively poor user of channel status, distribute more pilot frequency configuration.
9. the adaptive pilot distribution method in the OFDMA as claimed in claim 6 system is characterized in that, in described steps A, determines correspondingly pilot power according to the distance of terminal and transmitting terminal, comprises the following steps:
Distance between terminal and base station is measured, and measurement result and pre-set threshold are compared, determine pilot power according to comparative result.
10. the adaptive pilot distribution method in the OFDMA as claimed in claim 9 system is characterized in that, describedly determines correspondingly pilot power, is actual range d and the pre-set threshold d that will measure
0Compare, if between a certain user and base station apart from d＞d
0, then to increase this user's pilot power; Otherwise, if d＜d
0, then to reduce corresponding pilot power.
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| CN200810008037A CN101527699A (en) | 2008-03-04 | 2008-03-04 | Self-adapting pilot frequency dispensing device and self-adapting pilot frequency dispensing method in OFDMA system |
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| CN200810008037A CN101527699A (en) | 2008-03-04 | 2008-03-04 | Self-adapting pilot frequency dispensing device and self-adapting pilot frequency dispensing method in OFDMA system |
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Cited By (8)
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| CN102685915A (en) * | 2012-05-02 | 2012-09-19 | 北京交通大学 | Self-adaptive dispatching method of uplink signal channel detection pilot frequency |
| CN104584654A (en) * | 2012-01-30 | 2015-04-29 | 奥普蒂斯蜂窝技术有限责任公司 | Method and apparatus for pilot power allocation in a multi antenna communication system |
| WO2015124029A1 (en) * | 2014-02-19 | 2015-08-27 | 中国移动通信集团公司 | Channel status information reference signal reconfiguration method and device |
| WO2016082127A1 (en) * | 2014-11-26 | 2016-06-02 | 华为技术有限公司 | Information transmission method, apparatus and system |
| CN107395334A (en) * | 2017-07-19 | 2017-11-24 | 安徽大学 | The extensive mimo system pilot distribution methods of TDD based on Game with Coalitions |
| WO2018077116A1 (en) * | 2016-10-25 | 2018-05-03 | 索尼公司 | Communication device and method used for multi-user spatial modulation |
| CN108702271A (en) * | 2016-02-26 | 2018-10-23 | 杜塞尔多夫华为技术有限公司 | Transmitting and receiving device processing synthesis pilot signal |
| CN109995685A (en) * | 2017-12-29 | 2019-07-09 | 北京三星通信技术研究有限公司 | Method and apparatus for channel estimation |
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| CN104584654A (en) * | 2012-01-30 | 2015-04-29 | 奥普蒂斯蜂窝技术有限责任公司 | Method and apparatus for pilot power allocation in a multi antenna communication system |
| CN102685915A (en) * | 2012-05-02 | 2012-09-19 | 北京交通大学 | Self-adaptive dispatching method of uplink signal channel detection pilot frequency |
| CN102685915B (en) * | 2012-05-02 | 2014-12-17 | 北京交通大学 | Self-adaptive dispatching method of uplink signal channel detection pilot frequency |
| WO2015124029A1 (en) * | 2014-02-19 | 2015-08-27 | 中国移动通信集团公司 | Channel status information reference signal reconfiguration method and device |
| WO2016082127A1 (en) * | 2014-11-26 | 2016-06-02 | 华为技术有限公司 | Information transmission method, apparatus and system |
| CN108702271B (en) * | 2016-02-26 | 2021-02-23 | 杜塞尔多夫华为技术有限公司 | Transmitting and receiving apparatus processing composite pilot signal |
| CN108702271A (en) * | 2016-02-26 | 2018-10-23 | 杜塞尔多夫华为技术有限公司 | Transmitting and receiving device processing synthesis pilot signal |
| WO2018077116A1 (en) * | 2016-10-25 | 2018-05-03 | 索尼公司 | Communication device and method used for multi-user spatial modulation |
| CN109863699A (en) * | 2016-10-25 | 2019-06-07 | 索尼公司 | Communication device and method for Multi-User Dimension modulation |
| US10756789B2 (en) | 2016-10-25 | 2020-08-25 | Sony Corporation | Communication device and method used for multi-user spatial modulation |
| US11152978B2 (en) | 2016-10-25 | 2021-10-19 | Sony Corporation | Communication device and method used for multi-user spatial modulation |
| US11303331B2 (en) | 2016-10-25 | 2022-04-12 | Sony Corporation | Communication device and method used for multiuser spatial modulation |
| CN107395334B (en) * | 2017-07-19 | 2019-08-13 | 安徽大学 | The extensive mimo system pilot distribution method of TDD based on Game with Coalitions |
| CN107395334A (en) * | 2017-07-19 | 2017-11-24 | 安徽大学 | The extensive mimo system pilot distribution methods of TDD based on Game with Coalitions |
| CN109995685A (en) * | 2017-12-29 | 2019-07-09 | 北京三星通信技术研究有限公司 | Method and apparatus for channel estimation |
| CN109995685B (en) * | 2017-12-29 | 2024-03-01 | 北京三星通信技术研究有限公司 | Method and apparatus for channel estimation |
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Application publication date: 20090909 |