CN101179281B - Method of eliminating co-channel transmitter signal interference - Google Patents
Method of eliminating co-channel transmitter signal interference Download PDFInfo
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- CN101179281B CN101179281B CN2006101385717A CN200610138571A CN101179281B CN 101179281 B CN101179281 B CN 101179281B CN 2006101385717 A CN2006101385717 A CN 2006101385717A CN 200610138571 A CN200610138571 A CN 200610138571A CN 101179281 B CN101179281 B CN 101179281B
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Abstract
The invention discloses a method for eliminating the same frequency transmitter signal interference. The method includes the following steps: a binary sequence is generated according to initial information of a transmitter and the initial information includes a network number, a regional series number or a program key; a scrambling sequence is generated with adoption of a scrambler with a polynomial structure and the scrambler takes the binary sequence as an initialization vector; the scrambling sequence is mapped into a complex scrambling sequence and time slot data is scrambled by means of the complex scrambling sequence. The invention eliminates signal interference of other same frequency transmitters, improves service quality at network borders and effectively improves the service quality in a single-frequency network with the same time slot in different service conditions.
Description
Technical field
The present invention relates to air interface (AirInterface) technology between the transmitter and terminal in a kind of mobile multimedia communication field, specifically, relate to a kind of method that co-channel transmitter signal disturbs of eliminating.
Background technology
Orthogonal frequency division multiplexi (OFDM) is the new modulation technique that occurs in recent years, has characteristics such as transmission rate height, anti-multipath interference performance are strong, spectrum efficiency height, adopts OFDM can realize Complex Channel environment high speed wireless digital communication.In the multimedia broadcasting technical field, adopt the OFDM technology to become a kind of trend.At present at digital audio broadcasting (DAB, Digital Audio Broadcasting), digital video broadcasting (DVB, Digital Video Broadcasting) with based on the WLAN (WLAN of IEEE802.11 standard, Wireless Local Area Networks) etc. the field all obtains practical application, also mainly all adopts the OFDM modulation technique in the follow-up evolution of third generation mobile.
In recent years, developed rapidly based on digital multimedia Single Frequency Network (SFN, the Single Frequency Networks) technology of OFDM, for example the multimedia broadcasting network of Stimi standard.
The main feature of this Single Frequency Network is:
The transmitting set that is in synchronous regime (transmitting base station or transmitting station) by a plurality of different locations, the same signal of same frequency emission at one time,, to realize broadcasting covering to certain service area, compare with existing 3G/2G network, adopt the high-power form of major station, be convenient to save frequency resource and cut operating costs.
As shown in Figure 1, in the existing technical specification of Stimi, program is divided according to time slot, and all time slots adopt identical scrambler structure, to data subcarrier in the time slot and pilot sub-carrier scrambling, realizes the randomization of data.
As shown in Figure 2, in the real network operation, Stimi Single Frequency Network system is except the service that sends whole network, also will send part has the service of areal variation, region intersection in co-channel transmitter or the same covering of base station frequently, disturb each other between the different service of identical time slot, influenced network service quality.So at this actual conditions, need provide a kind of new data scrambling method, eliminate the interference signal of other co-channel transmitter.
Summary of the invention
Technical problem solved by the invention provides a kind of method that co-channel transmitter signal disturbs of eliminating, and has eliminated the interference signal of other co-channel transmitter.
Technical scheme is as follows:
The method step of eliminating the co-channel transmitter signal interference is as follows:
(1) initialization information according to transmitter or base station generates binary sequence, and described initialization information comprises network number, zone number or program key;
(2) utilize generator polynomial structure scrambler, described scrambler with described binary sequence as initialization vector, the alignment of the effective subcarrier of first of the initial condition of scrambler and time slot generates two-way scrambler Si and Sq, with described two-way scrambler Si and Sq as scramble sequence;
(3) with two-way scrambler Si and Sq with
Mode be mapped to real number field, and generate multiple scrambler sequence with the form of Si+jSq, utilize and should multiple scrambler sequence carry out scrambling the time slot data.
Preferably, in the step (1), comprise at least one transmitter or base station.
Preferably, step (1) is specially:
Each transmitter or base station to Single Frequency Network are divided according to the region, give each transmitter or the different zone number of base station assigns; Give each different different program key of service program distribution; Utilize zone number, program key and network number to be arranged in binary sequence.
Preferably, in the described binary sequence of step (1), the 29th to 26 is network number, and the 25th to the 19th is zone number, and the 9th of 18-is program key.
Preferably, step (2) is specially:
According to generator polynomial x
30+ x
29+ x
28+ x
7+ 1 structure scrambler, as initialization vector, the alignment of the effective subcarrier of first of the initial condition of scrambler and time slot generates the two-way scrambler with described binary sequence, with described two-way scrambler as scramble sequence.
The present invention has eliminated the interference of other co-channel transmitter signal, has improved the service quality at network boundary place, has improved the service quality under the different conditions of service of identical time slot in the Single Frequency Network effectively.
Description of drawings
Fig. 1 is the scrambler structure that the Stimi standard adopts in the prior art;
Fig. 2 is the schematic diagram that the different services of identical time slot are disturbed each other in the existing Single Frequency Network;
Fig. 3 is the binary sequence that generates according to various numberings among the present invention;
Fig. 4 is the schematic diagram that the initialization scrambler generates scrambler sequence among the present invention.
Embodiment
With reference to the accompanying drawings, the preferred embodiments of the present invention are described in detail.
As shown in Figure 3 and Figure 4, the method step of elimination co-channel transmitter signal interference is as follows:
1, generates binary sequence according to emitter initialization info.
Initialization information comprises network number, zone number or program key.
Each transmitter or base station to Single Frequency Network are divided according to the region, give each transmitter or the different zone number of base station assigns, give each different different program key of service program distribution, add initialization informations such as network number, become a binary sequence according to certain sequence arrangement.
Network number, zone number and program key according to each different transmitters generate binary sequence, and wherein, the 29th to 26 is network number, and the 25th to the 19th is zone number, and the 18th to the 9th is program key, and remaining is to keep the position.
2, with binary sequence as initialization vector or mask, generate scramble sequence.
According to generator polynomial x
30+ x
29+ x
28+ x
7+ 1 structure scrambler, as initialization vector, the effective subcarrier of first of the initial condition of scrambler and time slot alignment (structure such as Fig. 4) generates I and Q two-way scrambler Si and Sq with above-mentioned binary sequence, with the two-way scrambler as scramble sequence.
3, the scramble sequence mapping is generated multiple scrambler sequence, utilize and multiple scrambler sequence to carry out scrambling the time slot data.
The scrambling process is exactly the process of input data and scramble sequence complex multiplication.Si (Sq) original series that scrambler generates is a binary data.In the system, what scrambler was imported is a plural number, so will shine upon binary data earlier, addition obtains plural scrambler sequence.First hardware consulting table is realized data map in the real system, calls complex multiplier then, just can finish the data scrambling process.
Two-way scrambler Si and Sq with
Mode be mapped to real number field, and with S
i+ jS
qForm generate multiple scrambler sequence, to the time slot data scrambling.
Claims (5)
1. eliminate the method that co-channel transmitter signal disturbs for one kind, step is as follows:
(1) initialization information according to transmitter or base station generates binary sequence, and described initialization information comprises network number, zone number or program key;
(2) utilize generator polynomial structure scrambler, described scrambler with described binary sequence as initialization vector, the alignment of the effective subcarrier of first of the initial condition of scrambler and time slot generates two-way scrambler Si and Sq, with described two-way scrambler Si and Sq as scramble sequence;
(3) with " 0 " that occurs among two-way scrambler Si and the Sq with
Replace, " 1 " with
Replace, be mapped to real number field, and generate multiple scrambler sequence, utilize and multiple scrambler sequence to carry out scrambling the time slot data with the form of Si+jSq.
2. the method that elimination co-channel transmitter signal according to claim 1 disturbs is characterized in that, in the step (1), comprises at least one transmitter or base station.
3. the method that elimination co-channel transmitter signal according to claim 2 disturbs is characterized in that step (1) is specially:
Each transmitter or base station to Single Frequency Network are divided according to the region, give each transmitter or the different zone number of base station assigns; Give each different different program key of service program distribution; Utilize zone number, program key and network number to be arranged in binary sequence.
4. the method that elimination co-channel transmitter signal according to claim 3 disturbs is characterized in that in the described binary sequence of step (1), the 29th to 26 is network number, and the 25th to the 19th is zone number, and the 9th of 18-is program key.
5. the method that elimination co-channel transmitter signal according to claim 1 disturbs is characterized in that step (2) is specially:
According to generator polynomial x
30+ x
29+ x
28+ x
7+ 1 structure scrambler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101385717A CN101179281B (en) | 2006-11-09 | 2006-11-09 | Method of eliminating co-channel transmitter signal interference |
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| CN2006101385717A CN101179281B (en) | 2006-11-09 | 2006-11-09 | Method of eliminating co-channel transmitter signal interference |
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| CN101179281A CN101179281A (en) | 2008-05-14 |
| CN101179281B true CN101179281B (en) | 2011-06-22 |
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| CN104753838B (en) * | 2013-12-26 | 2020-03-17 | 中兴通讯股份有限公司 | Interference processing method and device, network control unit and terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518253A (en) * | 2003-01-15 | 2004-08-04 | 华为技术有限公司 | A device and method for modulation and demodulation of orthogonal frequency division multiplexing |
| CN1753397A (en) * | 2004-09-20 | 2006-03-29 | 北京三星通信技术研究有限公司 | Transmission method and synchronization method of training symbols |
| CN101179282A (en) * | 2006-11-09 | 2008-05-14 | 中兴通讯股份有限公司 | Method of eliminating co-channel transmitter signal interference using scrambling |
| CN100505559C (en) * | 2006-10-10 | 2009-06-24 | 中兴通讯股份有限公司 | A Method for Eliminating Signal Interference of Same-frequency Transmitters |
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2006
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518253A (en) * | 2003-01-15 | 2004-08-04 | 华为技术有限公司 | A device and method for modulation and demodulation of orthogonal frequency division multiplexing |
| CN1753397A (en) * | 2004-09-20 | 2006-03-29 | 北京三星通信技术研究有限公司 | Transmission method and synchronization method of training symbols |
| CN100505559C (en) * | 2006-10-10 | 2009-06-24 | 中兴通讯股份有限公司 | A Method for Eliminating Signal Interference of Same-frequency Transmitters |
| CN101179282A (en) * | 2006-11-09 | 2008-05-14 | 中兴通讯股份有限公司 | Method of eliminating co-channel transmitter signal interference using scrambling |
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