CN101374019B - Method for reflecting system information through relative modulation phase sequence in frequency domain - Google Patents
Method for reflecting system information through relative modulation phase sequence in frequency domain Download PDFInfo
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- CN101374019B CN101374019B CN2007101475296A CN200710147529A CN101374019B CN 101374019 B CN101374019 B CN 101374019B CN 2007101475296 A CN2007101475296 A CN 2007101475296A CN 200710147529 A CN200710147529 A CN 200710147529A CN 101374019 B CN101374019 B CN 101374019B
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Abstract
A method for reflecting system information in a frequency domain through a relative phase modulation sequence, which is used in an orthogonal frequency division multiplexing (OFDM) system, comprises the steps of (1) setting a phase modulation sequence of a second reference signal relative to a first reference signal, and system information for reflection; (2) sending the first reference signal without attaching system information by system equipment; (3) selecting the phase modulation required by the second reference signal according to the system information, and sending the second reference signal; and (4) after the system equipment receives the signal, obtaining the phase modulation of the second reference signal relative to the first reference signal, carrying out accumulation to obtain a local phase modulation sequence, and matching the local phase modulation sequence with a set phase modulation sequence to obtain system information. By using the inventive method, the OFDM system can reflex additional system information via the known relative phase modulation sequence, guide user equipment to complete cell searching, read broadcast messages and the like, and expand the system information required to be reflected.
Description
Technical field
The present invention relates to GSM, the GSM that particularly adopts OFDM (OFDM) technology is in the method for frequency domain through relative modulation phase sequence reflecting system information.
Background technology
In GSM, the consideration of aspects such as the deciphering of the Cell searching of subscriber equipment, system message and channel estimating reference for ease generally has descending master sync signal, descending from synchronizing signal and downlink reference signal etc.As in WCDMA (WCDMA) GSM, has primary synchronization channel (P-SCH), from synchronizing channel (S-SCH) and CPICH Common Pilot Channel (CPICH) etc.; In TD SDMA (TD-SCDMA) GSM, then have downlink pilot frequency channel (DWPCH), Primary Common Control Physical Channel (P-CCPCH) etc.The combination of these channel informations has just reflected the relevant information of specific cell, thereby makes that subscriber equipment can read system message, and can receive the service that the network equipment provides.
The OFDM technology is divided into many orthogonal sub-channels with configurating channel in frequency domain, on each subchannel, use a number of sub-carrier to modulate, and each number of sub-carrier parallel transmission.Therefore, be particularly suitable for existing transmitting high speed data in the wireless mobile channel of multipath transmisstion and Doppler frequency shift, become main candidate's transmission technology of future mobile communications evolution at present.In the GSM that adopts the OFDM technology, signal is in time domain and frequency domain expansion, therefore with the third generation (3G) GSM based on CDMA technology difference arranged slightly.But descending master sync signal, descending from synchronizing signal and downlink reference signal etc. remains the option that must have.
In the TD-SCDMA GSM; Adopted the time domain relative phase modulation technique of downlink synchronous sequence (SYNC-DL) with respect to P-CCPCH; Through the border of modulated phase sequence message reflection P-CCPCH, this way has made things convenient for the deciphering of UE to system message.But because OFDM is a subcarrier transmission information of utilizing quadrature, therefore, this method is not suitable for the GSM that adopts the OFDM technology, and needs the information of reflection few yet.
In sum, current needs a kind of in based on the GSM of OFDM technology the technical scheme through relative modulation phase sequence reflecting system information, and can further expand the system information of required reflection.
Summary of the invention
Technical problem to be solved by this invention provides a kind of in the method for frequency domain through relative modulation phase sequence reflecting system information, makes that the GSM that adopts the OFDM technology can be through known relative modulation phase sequence reflection extra system information.
In order to address the above problem, the invention provides and a kind ofly be applied to GSM based on orthogonal frequency division multiplexi in the method for frequency domain through relative modulation phase sequence reflecting system information, comprise system equipment and subscriber equipment, may further comprise the steps,
A, set the modulation phase sequence of second reference signal with respect to first reference signal, and the system information that is used to reflect;
B, system equipment send not first reference signal of additional system information; According to said system information, select the required phase modulation of second reference signal, and send second reference signal;
After c, subscriber equipment are received first reference signal and second reference signal; Obtain the phase modulation of second reference signal with respect to first reference signal; And after adding up to obtain local modulation phase sequence; Subscriber equipment obtains said system information according to the local modulation phase sequence of modulation phase sequence coupling of said setting.
Further; Said method also can comprise; Among the said step b, said system equipment is selected the required extra phase modulation of second reference signal according to the system information of needs reflection; And all multiply by the pairing signal of phase modulation at all subcarriers of second reference signal, send second reference signal simultaneously.
Further; Said method also can comprise; Among the said step c, after said subscriber equipment is received first reference signal and second reference signal, first reference signal and second reference signal are carried out channel estimating respectively; Draw the channel estimation results of each subcarrier, obtain the phase modulation of second reference signal with respect to first reference signal.
Further, said method can comprise that also among the said step a, the modulation phase sequence of said setting is formulated according to the interval and the demodulation signal to noise ratio of operative scenario, first reference signal and second reference signal of system.
Further, said method can comprise that also said system information comprises the deversity scheme indication of system and/or the Transmission Time Interval border of system information.
Further, said method can comprise that also said reference signal comprises from synchronous channel signal and primary synchronization channel signal.
Further, said method can comprise that also said first reference signal and second reference signal are little at interval, and the phase place rotation that makes channel variation introduce is little, with the many system informations of relative phase modulation reflection.
Compared with prior art; Use the present invention; Make that the GSM that adopts the OFDM technology can be through known relative modulation phase sequence reflection extra system information; Like the Transmission Time Interval border of deversity scheme indication, system message etc., thus guides user equipment accomplish cell search process, read broadcast message etc., and expanded the system information of required reflection.
Description of drawings
Fig. 1 is comprehensive structure of time slot figure in the specific embodiment of the invention;
Fig. 2 is at the method flow diagram of frequency domain through relative phase modulation reflecting system information in the specific embodiment of the invention;
Fig. 3 is the structure of time slot figure of the frame structure Class1 of 3GPP LTE in the present invention's first embodiment;
Fig. 4 is the structure of time slot figure of the frame structure type 2 of 3GPP LTE in the present invention's second embodiment.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the invention is described further.
Main design of the present invention: as in structure of time slot figure shown in Figure 1; Reference signal 1 and reference signal 2 have taken the symbol of OFDM respectively; Two intersymbol intervals are less; So that the phase place that channel variation is introduced rotation is less, thus can be with the more system information of relative phase modulation reflection.
As shown in Figure 2, a kind ofly be applied to GSM based on orthogonal frequency division multiplexi in the method for frequency domain through relative modulation phase sequence reflecting system information, may further comprise the steps,
The modulation phase sequence of setting can be according to formulations such as the interval of operative scenario, reference signal 1 and the reference signal 2 of system and demodulation signal to noise ratios.
System information comprises the deversity scheme indication of system and/or the Transmission Time Interval border of system information etc.
The relative modulation phase sequence information of frequency domain can reflect the deversity scheme indication of system and/or the Transmission Time Interval border of system information etc.
Reference signal comprises S-SCH signal and P-SCH signal etc.
System equipment when sending reference signal 1, additional modulation phase information (being system information) not.
The system information that step 130, system equipment reflect according to needs is selected reference signal 2 required extra phase modulations, and all multiply by the pairing signal of phase modulation at all subcarriers of reference signal 2, sends reference signal 2 simultaneously;
After step 140, subscriber equipment are received reference signal 1 and reference signal 2, reference signal 1 and reference signal 2 are carried out channel estimating, draw the channel estimation results of each subcarrier;
Subscriber equipment carries out channel estimating respectively to reference signal 1 and reference signal 2, draws the channel estimation results of each subcarrier.
Below in conjunction with instantiation the present invention is described further.
First embodiment,
The frame structure type of 3G (Third Generation) Moblie gpp (3GPP) Long Term Evolution (LTE) shown in Figure 3 is used the phase-modulated information reflection CCPCH Transmission Time Interval border of S-SCH with respect to P-SCH.
Have P-SCH and S-SCH in the frame structure type of 3GPP LTE among Fig. 3, all be positioned at simultaneously on time slot 0 and the time slot 10, and its mark space is shorter; The channel that P-SCH and S-SCH experienced like this has good correlation; S-SCH is as shown in table 1 with respect to four phase-modulated information of P-SCH in definition; Through the coupling of phase place, subscriber equipment just can find the border of CCPCH, i.e. the border of the Transmission Time Interval of broadcast message, thus assisting users equipment is deciphered.
Applied four phase places of table 1:S-SCH
| Title | Four phase places | Implication |
| P0 | 225，315，45，315 | Four sub-frame have CCPCH down |
| P1 | 45，225，135，135 | Four sub-frame do not have CCPCH down |
Second embodiment,
Shown in Figure 4, application S-SCH can still be that 10ms has random access time slot one time at 5ms with respect to the phase-modulated information reflection user of P-SCH.
Have P-SCH and S-SCH in the frame structure type of 3GPP LTE among Fig. 4; Wherein P-SCH is positioned at DWPCH; S-SCH is positioned at last symbol of time slot 0, and these two intersymbol intervals are shorter, so the channel that P-SCH and S-SCH experienced has good correlation; S-SCH is as shown in table 2 with respect to the two phase modulation intelligence of P-SCH in definition; Through the coupling of phase place, it is P0 or P1 that subscriber equipment just can find the two phase of system's practical application, thereby the optional random access time slot of clear and definite 10ms has only 1 still to be that every 5ms all has access slot, and correct entering random access procedure.
The applied two phase of table 2:S-SCH
| Title | Two phase | Implication |
| P0 | 315，45 | System allows every 5ms to insert |
| P1 | 135，225 | System only allows 10ms to insert |
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. one kind in the method for frequency domain through relative modulation phase sequence reflecting system information, is applied to the GSM based on orthogonal frequency division multiplexi, comprises system equipment and subscriber equipment, it is characterized in that, may further comprise the steps,
A, set the modulation phase sequence of second reference signal with respect to first reference signal, and the system information that is used to reflect;
B, system equipment send not first reference signal of additional system information; According to said system information, select the required phase modulation of second reference signal, all multiply by the pairing signal of phase modulation at all subcarriers of second reference signal, and send second reference signal;
After c, subscriber equipment are received first reference signal and second reference signal; First reference signal and second reference signal are carried out channel estimating respectively; Draw the channel estimation results of each subcarrier, obtain the phase modulation of second reference signal with respect to first reference signal, and after adding up to obtain local modulation phase sequence; Subscriber equipment obtains said system information according to the local modulation phase sequence of setting of modulation phase sequence coupling.
2. the method for claim 1 is characterized in that, among the said step a, the modulation phase sequence of said setting is formulated according to the interval and the demodulation signal to noise ratio of operative scenario, first reference signal and second reference signal of system.
3. the method for claim 1 is characterized in that, said system information comprises the deversity scheme indication of system and/or the Transmission Time Interval border of system information.
4. the method for claim 1 is characterized in that, said first reference signal and second reference signal comprise from synchronous channel signal and primary synchronization channel signal.
5. the method for claim 1 is characterized in that, said first reference signal and second reference signal are little at interval, and the phase place rotation that makes channel variation introduce is little, with the many system informations of relative phase modulation reflection.
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| CN108282309B (en) * | 2017-01-06 | 2021-09-07 | 华为技术有限公司 | Reference signal transmission method and device |
| CN107707502A (en) * | 2017-11-04 | 2018-02-16 | 中国人民解放军国防科技大学 | Method for realizing frequency domain expansion in OFDM system |
Citations (5)
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|---|---|---|---|---|
| US6704374B1 (en) * | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
| CN1595856A (en) * | 2003-09-10 | 2005-03-16 | 凯明信息科技股份有限公司 | Method and apparatus for mobile communication system terminal to acquire broadcasting information device |
| CN2757444Y (en) * | 2004-12-02 | 2006-02-08 | 凯明信息科技股份有限公司 | Device for obtaining broadcast information site for mobile communication system terminal |
| CN1783752A (en) * | 2004-12-02 | 2006-06-07 | 凯明信息科技股份有限公司 | Method for obtaining broadcast information position in time-division duplex mobile communication system |
| CN1783751A (en) * | 2004-12-02 | 2006-06-07 | 凯明信息科技股份有限公司 | Method for obtaining broadcast information position in time-division duplex mobile communication system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6704374B1 (en) * | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
| CN1595856A (en) * | 2003-09-10 | 2005-03-16 | 凯明信息科技股份有限公司 | Method and apparatus for mobile communication system terminal to acquire broadcasting information device |
| CN2757444Y (en) * | 2004-12-02 | 2006-02-08 | 凯明信息科技股份有限公司 | Device for obtaining broadcast information site for mobile communication system terminal |
| CN1783752A (en) * | 2004-12-02 | 2006-06-07 | 凯明信息科技股份有限公司 | Method for obtaining broadcast information position in time-division duplex mobile communication system |
| CN1783751A (en) * | 2004-12-02 | 2006-06-07 | 凯明信息科技股份有限公司 | Method for obtaining broadcast information position in time-division duplex mobile communication system |
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