CN101202727B - 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
CN101202727B
CN101202727B CN2006101658926A CN200610165892A CN101202727B CN 101202727 B CN101202727 B CN 101202727B CN 2006101658926 A CN2006101658926 A CN 2006101658926A CN 200610165892 A CN200610165892 A CN 200610165892A CN 101202727 B CN101202727 B CN 101202727B
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China
Prior art keywords
subcarrier
subcarriers
group
data
centrosymmetric
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CN2006101658926A
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Chinese (zh)
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CN101202727A (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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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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    • 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 residential quarters simultaneously, how to isolate each cell signal, thus the technology of avoiding adjacent cell to disturb.
Background technology
Be convenient narration, the below only describes the residential quarter; 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 transmission bandwidth is divided into some sub-bands, uses concurrently mutually orthogonal subcarrier transmitting data information on every sub-frequency bands, 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.
Continuous renewal along with communication service, various new business demands constantly occur, the OFDMA technology is also generally used gradually, it is as the basis take 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 more complicated.
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.
The technology of usually using now is that the guide symbol signal with each residential quarter when carrying out/frequency isolated, and perhaps separates by signal processing technology at receiving terminal, isolated signal is carried out the processing at alone family.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) distribute identical data at centrosymmetric two subcarriers of the group of residential quarter to one's name;
C) after receiving terminal extracts data, centrosymmetric two subcarrier additions in the group are merged, carry out subsequent treatment with the data of summation as the alternate data of these two subcarriers.
The present invention realizes that simply, the inter-carrier interference that frequency deviation is caused has neutralization effect, and is high with existing correlation technique compatibility.
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 copies 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 residential quarter has been adopted the strategy of symmetrical distribution subcarrier in each group, and has placed identical transmitting data at symmetrical subcarrier.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 residential quarter concept of mentioning in this article comprises the sector, and the concepts such as relay station, characteristics are that receiving terminal receives simultaneously from the signal of homology not.
The present invention is mainly by two function compositions, 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 require to occupy subcarrier take little group switching centre as symmetric points.Two kinds of situations of odd number and even subcarriers may be arranged, as shown in Figure 1, subcarrier on the frequency domain is divided into the group that some adjacent sub-carriers consist of, then the subcarrier in each group is carried out Further Division, when the number of sub carrier wave of each group is odd number, can give a residential quarter with an allocation of carriers at center, then take this carrier wave as symmetrical centre, two symmetrical subcarriers are given a residential quarter in the distribution group successively.When the number of sub carrier wave of each group is even number, can give a residential quarter with two allocation of carriers at center, then take these two carrier waves as symmetrical centre, two symmetrical subcarriers are given a residential quarter in the distribution group successively.
Following rule is satisfied in each residential quarter when the transmitting data of determining on guide symbol, two data of launching on the inherent occupied paired symmetrical subcarrier of each group are identical data.
The receive data that receiving terminal needs will be on the symmetric position carries out addition, with the foundation of addition result as subsequent treatment.
Under this processing mode, when the signal from each residential quarter had frequency departure for receiver, it was because the mutual partial offset of the interference that causes of frequency departure.
Here, make an explanation as example for detection of the double sign structure of frequency deviation take a tradition, empirical tests, 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 back unloaded ripple of adding can be used as to isolate between group, carries out successively, until subcarrier assigns, inadequate one group subcarrier can be set to unloaded ripple, consists of altogether H group.
[1，2，3，4，5]，6，[7，8，9，10，11]，12，....
In this group under the odd subcarriers method of salary distribution,
1,5 two subcarrier is given residential quarter 1 in the group, and this two subcarriers are given in Random assignment 1 or-1, require identical.
2,4 two subcarriers are given residential quarter 2 in the group, and this two subcarriers are given in Random assignment 1 or-1, require identical.
3 give residential quarter 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 processed, obtain the frequency domain data of these two symbols, receiving terminal is divided according to the residential quarter subcarrier, with the symmetric data addition summation of the residential quarter under own in each group. Y ( h ) = Y c , h 1 + Y c , h 2 ,
Figure GSB00000680261000043
Represent respectively the data that receive on article one subcarrier of h group small area c and its symmetrical subcarrier.Then can estimate frequency deviation according to following formula:
Figure GSB00000680261000044
Y 1(h)Y 2(h)
Represent respectively the symbol that the merging of h group in first symbol and second symbol forms.

Claims (4)

1. the building method of a guide symbol comprises step:
A) subcarrier on the frequency domain is divided into the group that is made of some adjacent sub-carriers;
B) in each group, the subcarrier of each residential quarter is adopted the strategy of symmetrical distribution subcarrier, and belonging to the identical data of centrosymmetric two subcarriers distribution of a residential quarter and group;
C) after receiving terminal extracts data, the data addition on centrosymmetric two subcarriers in the group is merged, carry out subsequent treatment with the data of summation as the alternate data of these two subcarriers.
2. method according to claim 1 is characterized in that described step a) comprising:
When if the number of sub carrier wave of each group is odd number, then a subcarrier at center is given a residential quarter, then take this subcarrier as symmetrical centre, give different residential quarters with centrosymmetric two strip allocation of carriers in turn.
3. method according to claim 1 is characterized in that described step a) comprising:
When if the number of sub carrier wave of each group is even number, then two subcarriers at center are given a residential quarter, then take these two subcarriers as symmetrical centre, give different residential quarters with centrosymmetric two strip allocation of carriers in turn.
4. method according to claim 1 is characterized in that the occupied subcarrier bandwidth of each group is no more than coherence bandwidth.
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

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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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