CN101202727A - Method for constructing sub carrier wave interference self-counteract guide symbol - Google Patents

Method for constructing sub carrier wave interference self-counteract guide symbol Download PDF

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Publication number
CN101202727A
CN101202727A CNA2006101658926A CN200610165892A CN101202727A CN 101202727 A CN101202727 A CN 101202727A CN A2006101658926 A CNA2006101658926 A CN A2006101658926A CN 200610165892 A CN200610165892 A CN 200610165892A CN 101202727 A CN101202727 A CN 101202727A
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China
Prior art keywords
subcarrier
sub
data
subcarriers
group
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CNA2006101658926A
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Chinese (zh)
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CN101202727B (en
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仲川
梁宗国
王家城
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Application filed by Beijing Samsung Telecommunications Technology Research Co Ltd, Samsung Electronics Co Ltd filed Critical Beijing Samsung Telecommunications Technology Research Co Ltd
Priority to CN2006101658926A priority Critical patent/CN101202727B/en
Priority to PCT/KR2007/006542 priority patent/WO2008072928A1/en
Publication of CN101202727A publication Critical patent/CN101202727A/en
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Publication of CN101202727B publication Critical patent/CN101202727B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

A construction method for a subcarrier interference self-cancellation pilot symbol includes the steps that the subcarrier on a frequency domain is divided into a plurality of small groups consisting of neighboring subcarriers; same data is distributed on two centrosymmetric subcarriers of the small group belonging to a self-owned distinct; the two centrosymmetric subcarriers in the small group are added and combined after a receiving terminal extracts the data, and subsequent treatment is carried through by taking the summing data as the replaced data of the two subcarriers. The invention is easy to realize and has cancellation effect on the interference between the carriers caused by the frequency deviation. The invention has a high compatibility with the existing relevant technology.

Description

The building method of sub carrier wave interference self-counteract guide symbol
Technical field
The invention belongs to the field of information transmission in OFDM (hereinafter to be referred as OFDM)/OFDM access (OFDMA) system, be particularly related to ofdm system or OFDMA system under many cell conditions, when Cell Edge User receives the superposed signal of a plurality of sub-districts simultaneously, how to isolate each cell signal, thereby avoid the technology of adjacent area interference.
Background technology
For convenient narration, the sub-district is only described below; In fact, similar with cell conditions, the present invention is equally applicable to the sector situation.
OFDM is a kind of sound communication technology of carrying out the effective information transmission in channel.This technology utilizes a plurality of subcarriers (sub-carrier frequency) parallel, the transmission low-rate data to realize the communication of high data rate.Its technical essential is that the Channel Transmission bandwidth is divided into the plurality of sub frequency band, uses the subcarrier transmitting data information of mutually orthogonal on each sub-band concurrently, utilizes the orthogonality of its each subcarrier at receiving terminal, isolates the data message of parallel transmission.
The OFDM technology successfully has been applied in many communication systems, for example, digital broadcasting (DAB) and Digital Television (DVB) the employing OFDM technology formulated by european telecommunications standards institute ETSI are the wireless transmission standards of air interface, and WLAN standard IEEE802.11 and wireless metropolitan area network standard IEEE802.16 have also adopted the OFDM technology in addition.
Continual renovation along with communication service, various new business demands constantly occur, the OFDMA technology is also generally used gradually, it is based on the OFDM technology, form different subchannels by in running time-frequency resource, dividing different Resource Block, carry out different traffic assignments, can reach greater flexibility.
But ofdm system be one to the highstrung technology of frequency offset error, in the time of frequency of occurrences deviation, originally the interference that the data of transmitting on should each subcarrier of quadrature will produce other subcarriers, especially when travelling carriage received signal from different base station, different frequency departures will cause the problem of this inter-carrier interference complicated more.
And guide symbol, can be very helpful to the accuracy of estimating if can find a kind of method that the interference between this sub-carrier can be reduced undoubtedly as the estimation foundation of each physical parameter.
Now usually the technology of using is guide symbol signal with each sub-district when carrying out/frequency isolation, perhaps separates by signal processing technology at receiving terminal, isolated signal is carried out single user's processing.Adopt above solution, or can cause the reduction of resource utilization, perhaps launch the complicated of reception technique.
Summary of the invention
The building method that the purpose of this invention is to provide a kind of sub carrier wave interference self-counteract guide symbol.
For achieving the above object, a kind of building method of sub carrier wave interference self-counteract guide symbol comprises step:
A) subcarrier on the frequency domain is divided into the group that is made of some adjacent sub-carriers;
B) on centrosymmetric two subcarriers of group of sub-district to one's name, distribute identical data;
C) after receiving terminal extracts data, centrosymmetric two subcarrier additions in the group are merged, carry out subsequent treatment as the alternate data of these two subcarriers with the data of summation.
The present invention realizes that simply, the inter-carrier interference that frequency deviation is caused has neutralization effect, with existing related techniques compatibility height.
Description of drawings
Fig. 1 is the guide symbol organigram;
Fig. 2 is that one of the method construct that utilizes the present invention to describe duplicates the double sign structure.
Embodiment
The present invention divides into groups to the subcarrier of frequency domain by a kind of new guide symbol form of design, the subcarrier of each sub-district has been adopted the strategy of symmetrical distribution subcarrier in each group, and placed identical emission data on the subcarrier of symmetrical distribution.Also changed accordingly in logic at receiving terminal, satisfied under the prerequisite of these conditions, will self be cancelled out each other to a great extent by the interference that frequency deviation causes.The sub-district notion of mentioning in this article comprises the sector, and relay station etc. are remembered with gratitude, and characteristics are that receiving terminal receives simultaneously from the signal of homology not.
The present invention mainly is made up of two functions, and one is the guide symbol building method of emitting side, comprises sub-carrier wave distribution method and corresponding code word characteristic, and another is the corresponding logical changes of receiving terminal.
At first the subcarrier on the frequency domain is divided into the group that is made of some adjacent sub-carriers, the occupied subcarrier bandwidth of each group preferably is no more than coherence bandwidth.When being each cell allocation subcarrier, but requirement is that symmetric points occupy subcarrier with little group switching centre.Have two kinds of situations of odd and even number subcarrier, as shown in Figure 1, subcarrier on the frequency domain is divided into the group that some adjacent sub-carriers constitute, then the subcarrier in each group is further divided, when the number of sub carrier wave of each group is odd number, can give a sub-district with an allocation of carriers at center, be symmetrical centre with this carrier wave then, and two subcarriers of symmetry are given a sub-district in the distribution group successively.When the number of sub carrier wave of each group is even number, can give a sub-district with two allocation of carriers at center, be symmetrical centre with these two carrier waves then, two subcarriers of symmetry are given a sub-district in the distribution group successively.
Following rule is satisfied in each sub-district when the emission data of determining on guide symbol, two data of being launched on the subcarrier of the paired symmetrical distribution that each group is inherent occupied are identical data.
The reception data that receiving terminal needs will be on the symmetric position are carried out addition, with the foundation of addition result as subsequent treatment.
Under this processing mode, when the signal from each sub-district had frequency departure for receiver, it was because the interference that causes of frequency departure partial offset mutually.
Here, the double sign structure that is used to detect frequency deviation with a tradition is that example makes an explanation, empirical tests, and the method for introducing by this paper, in the end precision increases on the result that detects of frequency deviation.All number of sub carrier wave is for being 2048 subcarriers.
In first symbol, each group is made of 5 continuous subcarriers, and the back adds a unloaded ripple can make the usefulness of isolating between group, carries out successively, finishes until subcarrier allocation, and not enough one group subcarrier can be changed to unloaded ripple, constitutes H group altogether.
[1,2,3,4,5], 6, [7,8,9,10,11], and 12 .... in this group under the odd subcarriers method of salary distribution,
1,5 two subcarrier is given sub-district 1 in the group, and this two subcarriers are given in Random assignment 1 or-1, require identical.
2,4 two subcarriers are given sub-district 2 in the group, and this two subcarriers are given in Random assignment 1 or-1, require identical.
3 give sub-district 3 in the group, and this subcarrier is given in Random assignment 1 or-1.
This division is known to receiving terminal.
Second symbol is the copy of first symbol.The result as shown in Figure 2.
At the receiving terminal place, to finish when corresponding/after frequency is handled, obtain the frequency domain data of these two symbols, receiving terminal is divided according to the sub-district subcarrier, with the symmetric data addition summation of the sub-district under own in each group. Y ( h ) = Y c , h 1 + Y c , h 2 , Y C, h 1Y C, h 2Represent the data that receive on article one subcarrier of sub-district c in the h group and its symmetrical subcarrier respectively.Can estimate frequency deviation according to following formula then:
Y 1(h) Y 2(h) represent the symbol that the merging of h group in first symbol and second symbol forms respectively.

Claims (5)

1. the building method of a sub carrier wave interference self-counteract guide symbol comprises step:
A) subcarrier on the frequency domain is divided into the group that is made of some adjacent sub-carriers;
B) on centrosymmetric two subcarriers of group of sub-district to one's name, distribute identical data;
C) after receiving terminal extracts data, centrosymmetric two subcarrier additions in the group are merged, carry out subsequent treatment as the alternate data of these two subcarriers with the data of summation.
2. method according to claim 1 is characterized in that described step a) comprises:
If be odd number bar subcarrier, then the center subcarrier is given a sub-district, distributes to different sub-districts with centrosymmetric two in turn then.
3. method according to claim 1 is characterized in that described step a) comprises:
If be even number bar subcarrier, then give a sub-district for two of the center, distribute to different sub-districts with centrosymmetric two in turn then.
4. method according to claim 1 is characterized in that the occupied subcarrier bandwidth of each group is no more than coherence bandwidth.
5. method according to claim 1 is characterized in that described step b) comprises:
With not to one's name the subcarrier of sub-district be changed to unloaded ripple.
CN2006101658926A 2006-12-14 2006-12-14 Method for constructing sub carrier wave interference self-counteract guide symbol Expired - Fee Related CN101202727B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2006101658926A CN101202727B (en) 2006-12-14 2006-12-14 Method for constructing sub carrier wave interference self-counteract guide symbol
PCT/KR2007/006542 WO2008072928A1 (en) 2006-12-14 2007-12-14 Method for constructing sub-carrier interference self-cancellation preamble

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2006101658926A CN101202727B (en) 2006-12-14 2006-12-14 Method for constructing sub carrier wave interference self-counteract guide symbol

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CN101202727A true CN101202727A (en) 2008-06-18
CN101202727B CN101202727B (en) 2013-03-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102045287A (en) * 2009-10-19 2011-05-04 北京三星通信技术研究有限公司 Method for mapping and de-mapping data, transmitting device and receiving device
CN102594765A (en) * 2012-03-23 2012-07-18 清华大学深圳研究生院 Base-band symbol mapping and demapping methods for onboard orthogonal frequency division multiplexing (OFDM) communication system

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KR100664018B1 (en) * 2001-05-24 2007-01-03 엘지전자 주식회사 Synchronous signal detection apparatus for ofdm receiver
KR100555721B1 (en) * 2001-08-20 2006-03-03 삼성전자주식회사 Method for creating Symmetric-Identical preamble and method for synchronizing symbol and frequency of Orthogonal Frequency Division Multiplexed signals by using the Symmetric-Identical preamble
CN1205770C (en) * 2001-08-29 2005-06-08 西安电子科技大学 Orthogonal frequency division multiplex transmission system for digital surface broadcasting
US7123670B2 (en) * 2001-09-24 2006-10-17 Atheros Communications, Inc. Fine frequency offset estimation and calculation and use to improve communication system performance
US7305053B2 (en) * 2001-11-06 2007-12-04 Nxp B.V. Dat-aided frequency offset detection using phase unwrapping
KR20030090390A (en) * 2002-05-23 2003-11-28 주식회사 신영텔레콤 Apparatus for acquisition of synchronization in wireless lan system which is using orthogonal frequency division multiplexing
DE10241676A1 (en) * 2002-09-09 2004-03-18 Infineon Technologies Ag Estimation method for RF signals distortion caused by IQ-asymmetries, requires using sub-carriers arranged symmetrically to one another in transmission spectrum
CN1567764B (en) * 2003-06-23 2010-05-12 北京三星通信技术研究有限公司 New sub-channel generating and allocating method of multi-user OFDMA system
CN1753397B (en) * 2004-09-20 2011-01-12 北京三星通信技术研究有限公司 Transmission method of training symbol and synchronization method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102045287A (en) * 2009-10-19 2011-05-04 北京三星通信技术研究有限公司 Method for mapping and de-mapping data, transmitting device and receiving device
US9319259B2 (en) 2009-10-19 2016-04-19 Samsung Electronics Co., Ltd. Methods for mapping and de-mapping data, transmitting device and receiving device
CN102594765A (en) * 2012-03-23 2012-07-18 清华大学深圳研究生院 Base-band symbol mapping and demapping methods for onboard orthogonal frequency division multiplexing (OFDM) communication system

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WO2008072928A1 (en) 2008-06-19

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