CN1482820A - Mothod for common frequency transmission of WCDMA and GSM system - Google Patents
Mothod for common frequency transmission of WCDMA and GSM system Download PDFInfo
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- CN1482820A CN1482820A CNA031344364A CN03134436A CN1482820A CN 1482820 A CN1482820 A CN 1482820A CN A031344364 A CNA031344364 A CN A031344364A CN 03134436 A CN03134436 A CN 03134436A CN 1482820 A CN1482820 A CN 1482820A
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Abstract
The invention relates to a method for realizing mobile communication system expansion through the common frequency transmission of the GSM system and the WCDMA system, wherein the sending terminal of the GSM system first proceeding direct sequence spectrum spreading to the GSM signal before transmission, transforming the multiple address mode of the GSM into the hybrid CDMA/TDMA multiple address mode, then performing same frequency band transmission with the WCDMA system, the receiving end of the GSM system first de-expanding the received signal, transforming the CDMA/TDMA signal into TDMA signal, then resuming the primary signal of the GSM system through demodulation. By applying the invention, the system capacity can be expanded by at least three times.
Description
Technical field
The present invention relates to the mobile communication technology field, a kind of specifically new method of utilizing digital mobile cellular telecommunication (GSM) system and the transmission of broad band CDMA mobile communication (WCDMA) system same frequency to realize the mobile communication system dilatation.
Background technology
General travelling carriage mainly is made up of transceiver, signal processing, control and terminal interface four major parts, as shown in Figure 2.Wherein:
The transceiver part comprises antenna, transmitting element, receiving element, modem module.Wherein, antenna is finished the transmitting-receiving task to radiofrequency signal; Transmitting element is that signal to be transmitted is carried out power amplification, and carries out impedance matching with antenna, and radiofrequency signal is efficiently launched; Receiving element and antenna carry out impedance matching, and the signal power that receives is presented to greatest extent to next stage.Modem module is finished the modulation task to signal under the cooperation of frequency synthesizer and voltage controlled oscillator (VCO).
Signal processing comprises sending the signal processing partly and the signal processing of receiving unit.The signal processing that sends part comprises speech coding, and the time division multiple access of the chnnel coding under controller action, encryption, GSM (TDMA) frame forms, frequency hopping; The signal processing of receiving unit comprises demodulation, equilibrium, channel separation, deciphering, channel-decoding, tone decoding.Wherein the speech coding unit is finished the long-term linear predictive coding of the Regular-Pulse Excitation of voice signal (RPE-LTP), and the function of tone decoding unit is just in time opposite with the function of speech coding unit; The function of chnnel coding and decoding unit is to finish error control coding and decoding to signal by certain way (for example interweaving etc.); The encryption and decryption unit carries out encryption and decryption by cryptographic algorithm to user's information, guarantees safety of user information.
The function of control section is, whole travelling carriage is controlled and managed, and comprises the control of processes such as timing, frequency hopping, transceiver, base band signal process, interface and parts.
Terminal interface comprises man-machine interface (display, keyboard, SIM card), digital interface (digital terminal adapter), speech analog interface (A/D, D/A, microphone, loud speaker).Wherein keyboard, display be subscriber dialing, the parts of receiving and sending messages; SIM card is a Subscriber Identity Module, preserves user's relevant information; The mutual conversion of digital signal and analog signal is finished in A/D, D/A unit.
The signal flow process of travelling carriage is:
Signal sends (Lower Half of Fig. 2), by microphone sound is converted to analog electrical signal, the A/D unit becomes digital signal with this analog electrical signal, the speech coding unit is finished the long-term linear predictive coding of the Regular-Pulse Excitation of this digital signal (RPE-LTP), the chnnel coding unit is finished the convolutional encoding of coded voice signal and interweaving encoding, to improve the antijamming capability of system; By encryption equipment, user profile is carried out encryption, the fail safe of guarantee information; Under the effect of controller, form time division multiple access (TDMA) frame structure of standard; At last, through ovennodulation and power amplification, signal is launched by transmitter unit and antenna.
Signal receives (first half of Fig. 2),, presents to demodulator the radiofrequency signal process receiving element that receives with antenna; Under the cooperation of frequency synthesizer and voltage controlled oscillator (VCO), demodulator is finished the demodulation tasks to signal; Loose when balanced unit is offset multipath, the channel separation unit is used to separate the signal of different channels, by deciphering, recovers user's information, after channel-decoding is finished and deinterleaved, through tone decoding, obtains raw digital signal.At last, through the D/A conversion, digital signal becomes analog signal, the loud speaker reproduced sound.
Must carry out according to unified standard design of communication system.WCDMA is one of standard of 3-G (Generation Three mobile communication system), is the wideband CDMA system that directly signal is carried out spread spectrum in the frequency band of 5MHz, and it works in the 2GHz frequency range, and main feature is to support high-speed multimedia and Internet business.Compare with second generation mobile communication system, it has higher spectrum efficiency, lower electromagnetic radiation and better service quality.
Gsm system is typical case's representative of second generation TDMA mobile communication system, at present in the operation of many countries.In China, the frequency range of its work is 900MHz.At present, the main business of gsm system is conversation and transmitting-receiving short message.In order to improve transmission performance, to improve power system capacity, gsm system adopts frequency hopping, constantly changes the frequency of carrier wave according to certain way and speed, and to reduce the interference of decline and cochannel, this task is finished by the frequency hopping unit; Time division multiple access (TDMA) frame forms frame structure has been finished in the unit under the effect of controller formation task.When offsetting multipath, balanced unit looses; Convolutional encoding opposing random disturbances; The anti-bursty interference of interweaving encoding.Because GPRS (GPRS) system of GSM network can the transmitting grouped data business, supports wireless networking capabilities, thereby very popular with users.Along with the increase of multiple services development of mobile communication and number of users, the capacity that enlarges system has just become current urgent need, and simultaneously, the user is also more and more urgent to the demand of mobile multi-media service.These broadband services all require system must further expand communication band.But under the very nervous situation of frequency resource, according to GSM and two kinds of systems of WCDMA will be long-term and the situation of depositing, the dilatation that be embodied as multiple by any one separate payment in these two kinds of systems is suitable difficulty.
The technology contents of invention:
The purpose of this invention is to provide a kind of GSM of utilization and WCDMA with keeping pouring in the defeated method that realizes System Expansion, share to reach frequency range, the purpose of common dilatation is fundamentally alleviated the limited contradiction that increases rapidly with the mobile subscriber of frequency resource.
The technical scheme that realizes the object of the invention is to adopt frequency range 900MHz and 2GHz that GSM and two kinds of systems of WCDMA are distributed to share, and by increasing the available communication frequency band of each system, utilizes with keeping pouring in transferring technology, the expansion power system capacity.Its core technology is to eliminate the interference of GSM to the WCDMA system, concrete grammar is: the signal of WCDMA system is constant, only gsm system is handled, promptly the transmitting terminal at gsm system carries out direct sequence spread spectrum with the GSM signal earlier before emission, the GSM signal is expanded to 900MHz and 2GHz from the 900MHz frequency range, make the multi-access mode of GSM be converted to multiple access (CDMA/TDMA) mode of mixing by time division multiple access (TDMA), to guarantee that the GSM signal of transmission has identical multi-access mode with the WCDMA signal aloft, promptly all belong to CDMA signals; To mix the signal of multiple access (CDMA/TDMA) signal and WCDMA system in same band transmit aloft; At the receiving terminal of gsm system, carry out earlier despreading to the received signal, become and mix multiple access (CDMA/TDMA) signal into time division multiple access (TDMA) signal, carry out demodulation again, recover the primary signal of gsm system.
The same transmission method that keeps pouring in of above-mentioned WCDMA and gsm system, the process of wherein the GSM signal being carried out direct sequence spread spectrum before emission is as follows:
1. under the control of system timing signal, produce pseudo random sequence PN sign indicating number by PN code generator 1;
2. with this PN sign indicating number modulated GSM signal is carried out spread spectrum, time division multiple access (TDMA) signal of the band that narrows down is mixing multiple access (CDMA/TDMA) signal in broadband;
3. by transmitting element mixing multiple access (CDMA/TDMA) signal in this broadband is sent to the antenna emission, its working frequency range identical with bandwidth (being that the two distributed frequency range sum, i.e. 900MHz and 2GHz originally) with the WCDMA system.
The same transmission method that keeps pouring in of above-mentioned WCDMA and gsm system, wherein to carry out the process of despreading to the received signal as follows for the receiving terminal of gsm system:
1. from received signal, detect a yard synchronizing signal by synchronizing indicator;
2. with this yard synchronizing signal control PN code generator 2, make the PN sign indicating number of its generation and the PN sign indicating number strict synchronism of making a start;
3. carry out despreading to the received signal with this PN sign indicating number, mixing multiple access (CDMA/TDMA) signal of the band that broadens is time division multiple access (TDMA) signal of arrowband;
4. time division multiple access (TDMA) signal of this arrowband is sent to demodulator and carries out demodulation.
The same transmission method that keeps pouring in of above-mentioned WCDMA and gsm system, wherein at time division multiple access (TDMA) signal of transmitting terminal with the arrowband, being transformed to wide mixing multiple access (CDMA/TDMA) signal, is that time division multiple access (TDMA) signal by pseudo random sequence PN sign indicating number and arrowband multiplies each other and obtains.
The same transmission method that keeps pouring in of above-mentioned WCDMA and gsm system, being time division multiple access (TDMA) signal of arrowband at receiving terminal with mixing multiple access (CDMA/TDMA) signal transformation in broadband wherein, is that multiple access (CDMA/TDMA) signal that mixes by pseudo random sequence PN sign indicating number and broadband multiplies each other and obtains.
The same transmission method that keeps pouring in of above-mentioned WCDMA and gsm system, wherein will mix multiple access (CDMA/TDMA) signal and WCDMA system in same band transmit, adopt and the identical synchronizing process of WCDMA system, promptly the synchronizing process of gsm system transmitting-receiving two-end and WCDMA system are identical.
The same transmission method that keeps pouring in of above-mentioned WCDMA and gsm system, the pseudo random sequence PN code generation method that wherein is used for the GSM signal spread-spectrum is identical with the pseudo random sequence PN code generation method of WCDMA signal.
The present invention is owing to taked behind the GSM signal spread-spectrum, make its signal and WCDMA signal identical, promptly the working frequency range of two systems all expands to the more wideband section that comprises in 900MHz and the 2GHz, and the transmit signal power equal and opposite in direction, thereby avoided with keeping pouring in defeated GSM signal and WCDMA mutual interference among signals.Calculate by analysis, adopt the present invention, after fully taking into account various interference, can make two power system capacities at least respectively improve 3 times, make China's mobile communication total capacity enlarge 6 times.Therefore, under the very nervous situation of frequency resource, adopt the present invention to hold more user, support mobile multi-media service, guarantee that mobile communication industry the sound and sustained development provides technical support for mobile communication system.
Description of drawings:
Fig. 1 is an enforcement schematic diagram of the present invention.
Fig. 2 is the signal processing schematic diagram of existing GSM travelling carriage
Embodiment:
Above process can realize by hardware circuit shown in Figure 1.Fig. 1 has omitted the identical part in signal processing schematic diagram AB line the right with existing GSM travelling carriage.Signal of base station processing procedure and travelling carriage are similar.
With reference to Fig. 1, gsm system of the present invention comprises signal transmission unit branch (arrow is towards the part on the right side) and signal receive section (arrow is towards the part on a left side).
Signal transmission unit divides and mainly comprises PN code generator device 1, multiplier and transmitting element.
PN code generator 1 under the effect of controller and timer, produces pseudo random sequence PN sign indicating number, is sent to multiplier;
Multiplier with time division multiple access (TDMA) signal multiplication of pseudo random sequence PN sign indicating number and modulated arrowband, obtains mixing multiple access (CDMA/TDMA) signal in broadband, finishes the spread spectrum to the modulated time division multiple access of gsm system (TDMA) signal.
Transmitting element to after mixing multiple access (CDMA/TDMA) signal and carrying out power amplification, is sent to the antenna emission.
Signal receive section comprises synchronized signal detector, PN code generator 2 and multiplier.
Synchronized signal detector extracts the sign indicating number synchronizing signal from the signal that receives, in order to control PN code generator 2, make the PN sign indicating number strict synchronism of the PN sign indicating number and the transmitting terminal of its receiving terminal;
PN code generator 2 under the control of controller and synchronizing signal, produces pseudo random sequence PN sign indicating number, is sent to multiplier, carries out despreading in order to mixing multiple access (CDMA/TDMA) signal to the broadband;
Multiplier, carry out despreading to mixing multiple access (CDMA/TDMA) signal, mixing multiple access (CDMA/TDMA) signal of being with that broadens is time division multiple access (TDMA) signal of arrowband, after being sent to demodulator then and carrying out demodulation, recover primary speech signal by conventional process such as equilibrium shown in Figure 2, channel separation, deciphering, channel-decoding, tone decoding, D/A conversions again.
Through after the direct sequence spread spectrum, aloft Chuan Shu GSM signal is identical with WCDMA, all belongs to CDMA signals, and the synchronizing process of its transmitting-receiving two-end and WCDMA system are identical.For fear of with keeping pouring in defeated GSM signal and WCDMA mutual interference among signals, that the power and the maintenance of WCDMA signal of the GSM signal behind the spread spectrum is identical.In addition, it is identical with the WCDMA signal to be used for the PN sign indicating number sequence and the production method thereof of GSM signal.
Fig. 1 is combined with Fig. 2, promptly at the AB of Fig. 2 line left side connection layout 1 circuit, just can realize gsm system and WCDMA system same keep pouring in defeated.At this moment, the GSM signal that transmits in the space belongs to the mixing multi-access mode, and is identical with the signal working frequency range of WCDMA system.Though there are co-channel interference in GSM and WCDMA system in transmission course,, therefore still can obtain separately signal by despreading because the PN sign indicating number is mutually orthogonal.
Claims (7)
1. WCDMA and gsm system are with keeping pouring in transmission method, frequency range 900MHz and 2GHz that GSM and two kinds of systems of WCDMA are distributed share, by increasing the available communication frequency band of each system, and it is defeated with keeping pouring in, enlarge power system capacity, promptly keep the WCDMA signal constant, only gsm system is handled, concrete steps are as follows:
(1) transmitting terminal at gsm system carries out direct sequence spread spectrum with signal before emission, make the multi-access mode of gsm system be converted to multiple access (CDMA/TDMA) mode of mixing, to guarantee that the GSM signal of transmission is identical with the multi-access mode of WCDMA signal aloft by time division multiple access (TDMA);
(2) should mix multiple access (CDMA/TDMA) signal and WCDMA system in same band transmit;
(3) at the receiving terminal of gsm system, carry out despreading to the received signal, become mixing multiple access (CDMA/TDMA) signal and be time division multiple access (TDMA) signal;
(4) this time division multiple access (TDMA) signal is carried out demodulation again, recover the primary signal of gsm system.
2. according to claim 1 with keeping pouring in transmission method, the process that it is characterized in that the GSM signal is carried out direct sequence spread spectrum before emission is as follows:
1. under the control of system timing signal, produce pseudo random sequence PN sign indicating number by PN code generator 1;
2. with this PN sign indicating number modulated GSM signal is carried out spread spectrum, time division multiple access (TDMA) signal of the band that narrows down is mixing multiple access (CDMA/TDMA) signal in broadband;
3. by transmitting element mixing multiple access (CDMA/TDMA) signal in this broadband is sent to the antenna emission, its working frequency range is identical with the WCDMA system with bandwidth.
3. according to claim 1 with keeping pouring in transmission method, the process that the receiving terminal that it is characterized in that gsm system carries out despreading to the received signal is as follows:
1. from received signal, detect a yard synchronizing signal by synchronized signal detector;
2. with this yard synchronizing signal control PN code generator 2, make the pseudo random sequence PN sign indicating number of its generation and the pseudo random sequence PN sign indicating number strict synchronism of making a start;
3. carry out despreading to the received signal with this PN sign indicating number, mixing multiple access (CDMA/TDMA) signal of the band that broadens is time division multiple access (TDMA) signal of arrowband;
4. time division multiple access (TDMA) signal of this arrowband is sent to demodulator and carries out demodulation.
4. according to claim 1 and 2 with keeping pouring in transmission method, it is characterized in that transmitting terminal is mixing multiple access (CDMA/TDMA) signal in broadband with time division multiple access (TDMA) signal transformation of arrowband, is that time division multiple access (TDMA) signal by pseudo random sequence PN sign indicating number and arrowband multiplies each other and obtains.
5. according to claim 1 or the 3 described transmission methods that keep pouring in together, it is characterized in that receiving terminal is time division multiple access (TDMA) signal of arrowband with mixing multiple access (CDMA/TDMA) signal transformation in broadband, is that multiple access (CDMA/TDMA) signal that mixes by pseudo random sequence PN sign indicating number and broadband multiplies each other and obtains.
6. according to claim 1 with keeping pouring in transmission method, it is characterized in that with mixings multiple access (CDMA/TDMA) signal and WCDMA system in same band transmit employing and the identical synchronizing process of WCDMA system.
7. according to claim 2 with keeping pouring in transmission method, the pseudo random sequence PN code generation method that it is characterized in that being used for the GSM signal spread-spectrum is identical with the pseudo random sequence PN code generation method of WCDMA signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031344364A CN100435590C (en) | 2003-07-28 | 2003-07-28 | Mothod for common frequency transmission of WCDMA and GSM system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101326732B (en) * | 2005-10-19 | 2013-03-06 | 高通股份有限公司 | Diversity receiver for wireless communication and method of receiving diversity |
| CN110536288A (en) * | 2017-03-24 | 2019-12-03 | 阿托巴恩公司 | Viruses molecule network architecture and design |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101326732B (en) * | 2005-10-19 | 2013-03-06 | 高通股份有限公司 | Diversity receiver for wireless communication and method of receiving diversity |
| CN110536288A (en) * | 2017-03-24 | 2019-12-03 | 阿托巴恩公司 | Viruses molecule network architecture and design |
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Granted publication date: 20081119 Termination date: 20120728 |