CN1263248C - Multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for - Google Patents
Multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for Download PDFInfo
- Publication number
- CN1263248C CN1263248C CN 02160287 CN02160287A CN1263248C CN 1263248 C CN1263248 C CN 1263248C CN 02160287 CN02160287 CN 02160287 CN 02160287 A CN02160287 A CN 02160287A CN 1263248 C CN1263248 C CN 1263248C
- Authority
- CN
- China
- Prior art keywords
- despreading
- signal
- point
- synchronous
- demodulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention provides a multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for. In an SCDMA communication system, under complex transmission environment, the upgoing synchronous deviation appears in time period unable to use synchronous for a certain user caused by factors such as channel variation, the deviation of terminal receiving, timed deviation, etc. The multiple point demodulation and method for regulating each frame of the present invention is the method used for processing that synchronous deviation appears in a synchronous CDMA system; the method adopts the strategy of demodulation at multiple time points on a base station side to judge the point of an optimum receiving point with maximum signal-to-noise ratio or maximum demodulation power so as to demodulate an upgoing signal in the optimum receiving point and simultaneously transmit optimal position information by an original synchronous deviation adjusting command; a terminal user utilizes the information of an indication adjusting position to realize the synchronous correction of each frame consequently.
Description
Technical field
The present invention relates to a kind of method that occurs synchronism deviation in the synchronization code multi-address division system of handling, particularly relate to accurate demodulation and the every framing control method synchronously time of a kind of synchronization code multi-address division system.
Background technology
In S-CDMA (SCDMA) system, under multi-user and the metastable situation of channel, adopt time-multiplexed mode, utilize a sync id signal, can accomplish only to utilize very little expense, just can make system synchronization, thereby obtain the high availability of frequency spectrum, referring to the existing patent No. is 97118934, and denomination of invention is the patent of " foundation of S-CDMA link and maintenance method " and the frame format of Fig. 2.But under the transmission environment of complexity, as user's fast moving under the multipath serious environmental, to some users, in the time period that can not use sync id, to have some frames because the deviation and the factors such as deviation regularly of the variation of channel, terminal reception cause the uplink synchronous deviation, uplink synchronous frame devious is the frame of step-out, step-out not only has influence on this user's communications quality, also can have influence on the quality of other user uplink communications.
Uplink synchronous is the key that the SCDMA system realizes, the precision of uplink synchronous directly influences the performance of SCDMA system.The user is when mobile, the characteristic of channel will change, the major parameters such as incoming level of time delay, terminal that cause multipath are in continuous variation, add other undesirable factor, accomplish that will there be very big expense in strict general synchronously relatively difficulty or system on synchronously, therefore real system is quasi synchronous often when work, promptly utilizes existing synchronous adjustment mechanism, and multi-user's synchronism deviation is controlled within limits.User for continuous a few frame uplink loss, can cause its up signal to noise ratio decline even a few frame all wrong, so not only this user's signal is separated to be come out, and other users' signal also can be subjected to bigger influence, and the multiple access that promptly cdma system showed disturbs (MAI).User for step-out, the base station can be judged by accident to a little less than the signal, make the step-out user continue to raise transmitting power, further cause the aggravation that multiple access disturbs in the system, have influence on whole online user's speech quality, the speech quality that causes thus descends and also can aggravate along with the increase of number of users, so uplink loss is fatal to the influence of system, must be with new processing method solution.
The processing method of known technology is that terminal receives the synchronous adjustment instruction that a time base station issues every the n frame, through adjusting, the time that guarantees all terminal arrival base stations is identical, shown in the synchronous adjustment mechanism of Fig. 3, the base station is in given all users' of time point despreading signal, promptly so-called synchronous implication.When terminal was mobile under multi-path environment, the main footpath between terminal and the base station can change, and cause uplink synchronous to be difficult in the n frame and remain unchanged, like this in not sending out the n frame of adjusting instruction, just might step-out, thus have influence on this user's communications quality.
Summary of the invention
The defective that demodulation when the synchronization code multi-address division system standard that the present invention proposes is synchronous and every framing control method can simply, effectively solve above-mentioned known technology.This method is to adopt the strategy of many time points demodulation in base station side, judge the position of optimum reception point with maximum signal to noise ratio or maximal solution adjusting power, demodulation upward signal on optimum reception point, simultaneously the positional information of the best is utilized original synchronism deviation adjustment instruction to issue, the terminal use utilizes indication to adjust the information of position, realizes the synchronous correction of every frame.
Demodulation and every framing control method when synchronization code multi-address division system standard of the present invention is synchronous, concrete steps comprise:
(1) set a plurality of sampled points on the different time in base station side, the quantity of sampled point depends on that the disposal ability of base station DSP reaches the control requirement to the uplink synchronous precision.Each sampled point all has identical functions, can both be by despreading, realize separation to multiple user signals, and can both calculate power after each user's despreading or the signal to noise ratio after the despreading;
(2) set the signal to noise ratio of signal or the comparison means of signal power after the different despreading point despreadings of each user, can export the signal with maximum signal to noise ratio or despreading power and the position of pairing despreading point;
(3) send follow-up decoder module with the signal of selecting, the multi-system signal is demodulated into binary bit stream, with the positional information of residing despreading point, the SS (simultaneous bias) by the original free time is issued to terminal;
(4) terminal utilizes the frame number information in the system can know the synchronizing signal that when sends, so the frame number that end side just can be when receiving SS, determines the positional information of the best despreading point that the accurate SS value of original system still increases newly;
(5) end side is for original accurate SS value, carry out the synchronous adjustment of up launch time, for the SS value that increases newly, positional information according to the best despreading point of indicating, carry out the correction of up launch time, the correction of described up launch time is by the positional information of optimal demodulation point being utilized original synchronism deviation adjustment instruction issue, the terminal use utilizes indication to adjust the information of position, realizes with the synchronous correction that reaches every frame.
By accurate demodulation and the every framing control method synchronously time of synchronization code multi-address division system of the present invention, terminal is under complex environment during fast moving, can improve the stability of uplink power control and the stability of signal to noise ratio, the communication quality that finally shows as the user uplink voice is greatly improved.
Description of drawings
Fig. 1 is a up channel demodulation schematic diagram;
Fig. 2 is the frame format of known technology;
Fig. 3 is the synchronous adjustment mechanism of known technology;
Fig. 4 is the adjustment mechanism of standard of the present invention when synchronous;
Fig. 5 is the signal processing flow figure of base station side;
Fig. 6 is the Channel Processing flow chart of end side.
Embodiment
As shown in Figure 3, terminal receives the synchronous adjustment instruction that a time base station issues every the n frame, through adjusting, the time that guarantees all terminal arrival base stations is identical, and the base station is at given all users' of time point despreading signal, when terminal is mobile under multi-path environment, main footpath between terminal and the base station can change, cause uplink synchronous to be difficult in the n frame and remain unchanged, like this in not sending out the n frame of adjusting instruction, just might step-out.At this situation, the present invention increases a plurality of sampled points newly on the base station side time shaft, realize the multiple spot despreading, the subscriber signal that despreading goes out to multiple spot, according to signal to noise ratio after the despreading or signal power, select best despreading point, the SS instruction of positional information utilization free time of best despreading point is issued, realize every framing control of mobile phone (using mobile phone herein) side uplink transmission power as terminal.Specify as follows:
As shown in Figure 1, set 3 sampled points on the different time in base station side, each sampled point all has identical functions, can both be by despreading, realization is to the separation of multiple user signals, can both calculate power after each user's despreading or the signal to noise ratio after the despreading, promptly in the front and back of the despreading point of original technology, each increases a despreading point, and the distance between the despreading point is 1/2 chip.By to the signal to noise ratio of signal or the comparison means of signal power after the different despreading point despreadings of each user, export and have the signal of maximum signal to noise ratio or despreading power and the position of pairing despreading point.Send follow-up decoder module with the signal of selecting then, multi-system signal (as the multi-system phase-modulated signal) is demodulated into binary bit stream, positional information with residing despreading point, SS by the original free time is issued to terminal, as shown in Figure 4, long arrow among this figure is for sending the position of precise time adjusted value, and the short arrow among this figure is the information frame of newly-increased transmission optimum reception position.
Like this, in Fig. 1,, can think its time of advent, when solving Symbol, issue the instruction that time-delay sends to mobile phone with despreading point (1) near despreading point (1) for the high user of signal to noise ratio who solves at despreading point (1); Equally, for the high user of signal to noise ratio who solves at despreading point (2), can think that its time of advent is near despreading point (2), when solving Symbol with despreading point (2), issue the instruction of leading transmission to mobile phone, like this, just realized the synchronous correction of up launch time.For launching the terminal synchronizes deviation of being determined in turn, then carry out the adjustment of up launch time by the synchronous adjustment mechanism of known technology in original employing synchronizing signal.
Fig. 5 is the signal processing flow figure of base station side, base station side is sampled the signal of input by different time points, form corresponding N output signal flow with time point, (N is a natural number), parallel to each signal flow by quick Hadamard inverse transformation, obtain K user's the output signal after the despreading on N the time sampling point respectively, (K is a natural number), parallel will calculate its signal to noise ratio or signal power after despreading on the different time points to each user, select signal to noise ratio or signal power maximum, best despreading point as this user, the positional information of this best despreading point is inserted the SS control field of downlink frame, to send decoder from the despread signal that best despreading point obtains, thereby finish decoding.
Fig. 6 is the Channel Processing flow chart of end side (being mobile phone herein), the mobile phone side joint is accepted capable frame, according to the result of frame counter, judge that it is original precise synchronization adjustment instruction or the best despreading dot position information that increases newly that the time that solves is adjusted control word from downlink frame.If the adjustment of up launch time is then carried out in original accurate adjustment instruction, if best despreading point position command, then to revising up launch time.
In the embodiment of 3 demodulation of employing of the present invention, the stability of uplink power control, the stability of signal to noise ratio improve about 5dB, and the quality that finally shows as the user uplink voice is greatly improved.
The present invention is directed to accurate synchro system, under the prerequisite that does not change the original system frame structure, uply select multiple spot to carry out despreading from time shaft, determine the position of best despreading point according to the signal to noise ratio after the despreading or signal power, utilize original idle SS to transmit the positional information of best despreading point, end side is then according to the position that receives SS, judgement is precise synchronization adjustment instruction or best despreading dot position information, to different information, adopt different processing policies, promptly adjust synchronously, revise synchronously according to the positional information of best despreading point according to accurately adjusting instruction.Like this, terminal during fast moving, can improve the stability of uplink power control and the stability of signal to noise ratio under complex environment, and the communication quality that finally shows as the user uplink voice is greatly improved.
Claims (5)
1. demodulation and every framing control method when a synchronization code multi-address division system standard is synchronous are used for handling the synchronism deviation that synchronization code multi-address division system occurs, and it is characterized in that, comprise the steps:
(1) set a plurality of sampled points on the different time in base station side, each described sampled point all has identical functions, can both be by despreading, realize separation to multiple user signals, and can both calculate power after each user's despreading or the signal to noise ratio after the despreading;
(2) set the signal to noise ratio of signal or the comparison means of power after the different despreading point despreadings of each user, can export the signal with maximum signal to noise ratio or power and the position of pairing despreading point;
(3) send follow-up decoder module with the signal of selecting, the multi-system signal is demodulated into binary bit stream, with the positional information of residing despreading point, the simultaneous bias by the original free time is issued to terminal;
(4) terminal utilizes the frame number information in the system can know the synchronizing signal that when sends, and the frame number of end side when receiving simultaneous bias determined the positional information of the best despreading point that the precise synchronization deviant of original system still increases newly;
(5) end side is carried out the synchronous adjustment of up launch time for original precise synchronization deviant; For the simultaneous bias value that increases newly,, carry out the correction of launch time according to the positional information of the best despreading point of indicating;
Wherein, the positional information of described best despreading point is to determine according to signal to noise ratio after the despreading or signal power, and described best despreading point is the despreading point for signal to noise ratio after the despreading or signal power maximum.
2. demodulation and every framing control method when synchronization code multi-address division system standard as claimed in claim 1 is synchronous is characterized in that, in described step (1), the quantity of described sampled point depends on that the disposal ability of base station DSP reaches the control requirement to the uplink synchronous precision.
3. demodulation and every framing control method when synchronization code multi-address division system standard as claimed in claim 1 is synchronous, it is characterized in that, in described step (5), the correction of the launch time that described end side is carried out is that the synchronous correction that the simultaneous bias value of the best despreading point of end side utilization reaches every frame realizes.
4. demodulation and every framing control method when synchronization code multi-address division system standard as claimed in claim 1 is synchronous is characterized in that the signal after the despreading of described a plurality of sampled points obtains by each signal flow being carried out quick Hadamard inverse transformation.
5. demodulation and every framing control method when synchronization code multi-address division system standard as claimed in claim 1 is synchronous is characterized in that described frame number information is the result of frame counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160287 CN1263248C (en) | 2002-12-31 | 2002-12-31 | Multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160287 CN1263248C (en) | 2002-12-31 | 2002-12-31 | Multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1457158A CN1457158A (en) | 2003-11-19 |
| CN1263248C true CN1263248C (en) | 2006-07-05 |
Family
ID=29410449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02160287 Expired - Fee Related CN1263248C (en) | 2002-12-31 | 2002-12-31 | Multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1263248C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361423C (en) * | 2004-05-12 | 2008-01-09 | 北京信威通信技术股份有限公司 | Method for synchronizing down going service code channel in CDMA system of using intelligent antenna |
| CN100365944C (en) * | 2004-07-19 | 2008-01-30 | 北京信威通信技术股份有限公司 | Method for increasing signal noise ration of down voice code channel in SCDMA system |
| CN101060364B (en) * | 2006-04-20 | 2011-02-09 | 上海宣普实业有限公司 | Uplink data transmission equipment in TD-SCDMA system |
| CN101499847B (en) * | 2008-01-30 | 2012-11-14 | 电信科学技术研究院 | Method, system and terminal for implementing synchronization between terminal and base station |
| CN102064876B (en) * | 2010-06-18 | 2013-08-07 | 北京大学 | Time division duplex communication method of satellite user terminal |
-
2002
- 2002-12-31 CN CN 02160287 patent/CN1263248C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1457158A (en) | 2003-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR200299433Y1 (en) | User equipment (ue) having acqisition circuit for 1.28 mcps chip rate mobile telecommunication system | |
| EP0993706B1 (en) | Reception of both Time-Switched Transmission Diversity (TSTD) Signals and non-TSTD Signals | |
| CN1130035C (en) | Forward link transmission power control during soft handoff | |
| CN100568757C (en) | In the TDD-CDMA communication system, be used to support the method and apparatus of downlink combined detection | |
| AU775731B2 (en) | Radio communication apparatus used in CDMA communication system, which has fingers and is designed to perform rake reception, and power consumption control method therefor | |
| CN1447548A (en) | Mobile communicating system | |
| CN101394581A (en) | Access and synchronization method and apparatus for special carrier of multimedia broadcast multicast service | |
| EP1127417A1 (en) | Method of processing cdma signal components | |
| CN1263248C (en) | Multiple point demodulation and method for regulating synchronous CDMA system as quasi-synchronization each frame for | |
| CN1254225A (en) | Transmitting power control method using one pilot code element mode | |
| JP2003525539A (en) | Effective system and method for facilitating rapid paging channel demodulation via efficient off-line search in wireless communication systems | |
| CN1239361A (en) | Route estimating device and communication terminal device | |
| WO2002063794A1 (en) | System and method for multistage interference cancellation | |
| CN103369665A (en) | TD-LTE relay system and synchronizing signal extraction method and device thereof | |
| CN1511384A (en) | Transmission power control method in wireless mobile device | |
| CN200962592Y (en) | Device for controlling the non-continuous transmission status power | |
| CN101399601B (en) | Time division system frame construction, setting method, processing method and device thereof | |
| GB2351879A (en) | RAKE receiver for CDMA cellular system | |
| CN1691555B (en) | A method for reducing uplink synchronous channel interference in TD-SCDMA access system | |
| CN101610099B (en) | Method, device and receiving system for realizing multi-path search | |
| JP2003204582A (en) | Method for controlling transmission of high-speed data traffic in ipdl | |
| CN102573041B (en) | HSPA+ timing synchronization keeping method | |
| CN101399602A (en) | Time division system frame, setting method, processing method and device thereof | |
| Korah et al. | Towards the implementation of a WCDMA AAA receiver on an FPGA software radio platform | |
| CN1166096C (en) | Method for synchronizing special physical channels in WCDMA access system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20191121 Granted publication date: 20060705 |
|
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20200710 Granted publication date: 20060705 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060705 Termination date: 20191231 |