CN104993917A - Asymmetric frequency band TDD communication system for asymmetric communication system - Google Patents
Asymmetric frequency band TDD communication system for asymmetric communication system Download PDFInfo
- Publication number
- CN104993917A CN104993917A CN201510393968.XA CN201510393968A CN104993917A CN 104993917 A CN104993917 A CN 104993917A CN 201510393968 A CN201510393968 A CN 201510393968A CN 104993917 A CN104993917 A CN 104993917A
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- China
- Prior art keywords
- communication system
- asymmetric
- frequency band
- band tdd
- ofdm
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses an asymmetric frequency band TDD communication system for an asymmetric communication system. The asymmetric frequency band TDD communication system uses an asymmetric solution that an uplink physical bandwidth is more than downlink physical bandwidth, and reduces the implementation cost of a terminal via a asymmetric frequency band TDD transmission method so as to reduce the implementation cost of the whole communication system.
Description
Technical field
The invention belongs to communication technical field.
Background technology
Such as in the communication system of supervisory control system, down going channel is many times for transmitting control command, and bandwidth occupancy is usually very little; But the multi-medium datas such as uploading channel often needs transmission of video, audio frequency, need higher bandwidth.TDD (time division multiplexing) technology is also often used in point-to-point, in the supervisory control system of point-to-multipoint, for realizing downstream transmission on the same frequency band.Current point-to-point based on TDD, the supervisory control system transmission design of point-to-multipoint is all generally symmetrical communication system, and namely up link and down link use Same Physical communication channel, as all used the physical channel of the 5.8GHz of 10MHz.In such a communications system, terminal also must realize the receiver system with local side same band.And usually, the receiver system realizing high band width in physical means and higher realizes cost.In addition, the cost that realizes of receiver realizes cost generally far above transmitter.Therefore, in design symmetrical at present, it is very high that terminal realizes cost.In the supervisory control system of one-to-many, terminal number is usually far away more than local side.If the instinct that is embodied as that can reduce terminal realizes cost by what greatly reduce whole system.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of asymmetric frequency band tdd communication system for asymmetric communication system, when not loss system performance, transmitted by asymmetric frequency band TDD, that reduces terminal realizes cost.
Technical scheme: for achieving the above object, technical scheme of the present invention is as follows:
For the asymmetric frequency band tdd communication system of asymmetric communication system, comprise up link and down link, described uplink physical bandwidth and Downlink Physical bandwidth asymmetric, uplink physical band is wider than Downlink Physical bandwidth.
Further, described uplink physical bandwidth be the N of Downlink Physical bandwidth doubly, described N be more than or equal to 2 integer.
Further, the FFT of the OFDM of described uplink signal process converts the M of the FFT sampling number of the OFDM being down link signal process that counts doubly, and N=M.
Beneficial effect: the present invention is when not loss system performance, and by asymmetric frequency band TDD transmission method, that reduces terminal realizes cost, thus reduce whole communication system realize cost.
Accompanying drawing explanation
Accompanying drawing 1 is up link of the present invention and the time dependent rule figure of downlink band broadband.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
When the telecommunication transmission system for Design of Monitoring and Control System TDD, current design all adopts the band width in physical of uplink and downlink symmetry, and like this, it is high that terminal equipment can realize cost compare usually.The present invention proposes the asymmetrical scheme that uplink physical band is wider than Downlink Physical bandwidth, as shown in Figure 1.
Because OFDM technology is widely used in plurality of communication systems now, the core of OFDM is FFT conversion, for the TDD asymmetric system adopting OFDM, can take a kind of design of simple possible.Usually can uplink physical bandwidth Design be the Integer N of Downlink Physical bandwidth doubly, N be more than or equal to 2 integer.Such as, Downlink Physical bandwidth is 10M, and uplink physical bandwidth is 20M, and so the sampling rate of terminal system is the half of CMTS sampling rate, and the time of a sampled point of terminal system is the twice of the time of a CMTS sampled point.
Then, then the integer M of the FFT sampling number being also designed to Downlink Physical bandwidth OFDM of the FFT of uplink physical bandwidth OFDM conversion being counted doubly, N=M.Such as, down link signal process adopts the ofdm system of 256 FFT, and uplink physical bandwidth adopts the ofdm system of 512 FFT, like this, the cell of each Downlink Physical bandwidth OFDM and the cell of uplink physical bandwidth OFDM completely the same in time span, this make the time slot of asymmetric tdd communication system design become very simple.
What more than provide is a design based on the asymmetric tdd communication system of OFDM, but adopts the design of the asymmetric tdd communication system of OFDM to be not limited thereto.And asymmetric tdd communication system also can adopt the modulation technique of single carrier (SC) easily.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1., for the asymmetric frequency band tdd communication system of asymmetric communication system, it is characterized in that: comprise up link and down link, described uplink bandwidth and downlink bandwidth asymmetric.
2., according to claim 1 for the asymmetric frequency band tdd communication system of asymmetric communication system, it is characterized in that: described uplink band is wider than downlink bandwidth.
3., according to claim 2 for the asymmetric frequency band tdd communication system of asymmetric communication system, it is characterized in that: described uplink bandwidth be the N of downlink bandwidth doubly, described N be more than or equal to 2 integer.
4. according to claim 3 for the asymmetric frequency band tdd communication system of asymmetric communication system, it is characterized in that: based on the asymmetric tdd communication system of OFDM, the FFT of the OFDM of described uplink signal process converts the M of the FFT sampling number of the OFDM being down link signal process that counts doubly, and N=M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510393968.XA CN104993917A (en) | 2015-07-07 | 2015-07-07 | Asymmetric frequency band TDD communication system for asymmetric communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510393968.XA CN104993917A (en) | 2015-07-07 | 2015-07-07 | Asymmetric frequency band TDD communication system for asymmetric communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104993917A true CN104993917A (en) | 2015-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510393968.XA Pending CN104993917A (en) | 2015-07-07 | 2015-07-07 | Asymmetric frequency band TDD communication system for asymmetric communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300870A (en) * | 2020-08-10 | 2021-08-24 | 阿里巴巴集团控股有限公司 | Access layer switch, upper layer switch and data center network system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772185A (en) * | 2009-01-06 | 2010-07-07 | 大唐移动通信设备有限公司 | Random access processing method and equipment in long-term evolution upgrading multi-carrier polymerizing system |
| CN101772131A (en) * | 2009-01-05 | 2010-07-07 | 大唐移动通信设备有限公司 | Method, system and device for sending random access feedback information |
| CN102026392A (en) * | 2010-12-10 | 2011-04-20 | 大唐移动通信设备有限公司 | Method, system and equipment for working on time division duplex (TDD) cell |
-
2015
- 2015-07-07 CN CN201510393968.XA patent/CN104993917A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772131A (en) * | 2009-01-05 | 2010-07-07 | 大唐移动通信设备有限公司 | Method, system and device for sending random access feedback information |
| CN101772185A (en) * | 2009-01-06 | 2010-07-07 | 大唐移动通信设备有限公司 | Random access processing method and equipment in long-term evolution upgrading multi-carrier polymerizing system |
| CN102026392A (en) * | 2010-12-10 | 2011-04-20 | 大唐移动通信设备有限公司 | Method, system and equipment for working on time division duplex (TDD) cell |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300870A (en) * | 2020-08-10 | 2021-08-24 | 阿里巴巴集团控股有限公司 | Access layer switch, upper layer switch and data center network system |
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Application publication date: 20151021 |