CN1859039A - Mobile communication system and its method for reducing up channel Doppler effect - Google Patents
Mobile communication system and its method for reducing up channel Doppler effect Download PDFInfo
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Abstract
This invention discloses a mobile communication system and a method for reducing Doppler effect of the up channels, which inputs the signals from an up channel of a higher level into multiple branches, corrects the deviation of them based on different preset deviations and compares signals of the channels after the correction then to output the best signals to the lower level, in which, the deviation correction to the up channel signals and the selection of the best signals can be done at the baseband part or the RF part and the branches for the deviation correction are in odd number and the preset deviation of one branch is 0 and others are in pairs symmetrically, one positive , the other is negative.
Description
Technical field
The present invention relates to mobile communication technology, particularly need be applied to the mobile communication system of high velocity environment.
Background technology
3-G (Generation Three mobile communication system) Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess, be called for short " WCDMA ") be one of global at present three kinds of main 3G (Third Generation) Moblies (The ThirdGeneration is called for short " 3G ") system.The WCDMA system owing to its strong multimedia communication capacity, high-speed data transmission speed and efficiently many advantages such as availability of frequency spectrum gain great popularity, and become the developing goal of future mobile communications.
The WCDMA system comprises Frequency Division Duplexing (FDD) (Frequency Division Duplex is called for short " FDD ") and two kinds of working methods of time division duplex (Time Division Duplex is called for short " TDD ").Its physical channel is divided into public physical channel and DPCH two big classes, and public physical channel is divided into descending public physical channel and up public physical channel.Physical Random Access Channel (Physical RandomAccess Channel is called for short " PRACH ") is exactly the public uplink physical channel of WCDMA system under the FDD working method.User terminal inserts the WCDMA system at random by this channel, communicates with the base station, obtains the business that the WCDMA system provides.
On the PRACH channel, the random access procedure that carries out between user terminal and the base station is to have the access way at random (time slot A LOHA) of the time slotization of quick access indication to realize with a kind of.It comprises targeting signal and message signale two parts, as shown in Figure 1.Targeting signal is long to be 1ms, and message signale is long to be 10ms or 20ms, and the empty slot length between different piece is 0.25ms.
Wherein, targeting signal be by 16 complex symbols (1+j or-1-j, j is the mark of imaginary part) characteristic sequence formed.It is that 16 quadrature Gold sign indicating number produces that these sequences are based on length, has 16 different sequences.In a sub-district, the operable message of which characteristic sequence is broadcasted by the base station down channel.Quadrature Gold sign indicating number with long 256 chips partly carries out spread spectrum to targeting signal, and system has 256 different quadrature Gold sign indicating numbers, and one or more quadrature Gold sign indicating numbers are used in a base station.
Message signale is made up of data and control two parts, sends by two physical channels are parallel respectively.Data division carries request or the user grouping request of inserting at random, and its spreading factor span is 256,128 and 32.Control section carries frequency pilot sign and speed indication information, and its spreading factor is fixed as 256.Control section uses different channel codes to carry out channelizing respectively with data division and handles, and uses multiple scrambler to carry out scrambling then.Multiple scrambler is corresponding with the label that targeting signal uses.
In random access procedure, user terminal sends targeting signal as inserting request by up PRACH channel, and the base station judges whether to allow to insert according to the last detected targeting signal of PRACH, and at descending acquisition indicator channel (Acquisition Indicator Channel, be called for short " AICH ") go up transmission acquisition indicator (Acquisition Indicator is called for short " AI ") information to user terminal.Whether this AI information can be confirmation (ACK), also can be confirmation (NACK) not, indicate the base station to allow user terminal to continue to send message signale respectively.
Move because user terminal exists when sending message signale, make the relative user terminal in base station be kept in motion.And when the relative transmitter of receiver is in the motion state of given pace, the signal that receives has Doppler frequency shift, as shown in Figure 2, under the situation that moving direction is determined, the relative position of user terminal and base station different, can cause positive and negative different frequency deviation, when user terminal when the direction away from the base station moves because the actual frequency that the base station receives is f0-2*fd, the actual frequency that user terminal receives is f0-fd, cause negative bias, and when user terminal when moving near the direction of base station because the actual frequency that the base station receives is f0+2*fd, the actual frequency that user terminal receives is f0+fd, cause positively biased, wherein the fd=frequency deviation; The f0=centre frequency.When amounts of frequency offset is excessive, can cause communication quality to descend, base station amounts of frequency offset and relative velocity are directly proportional, and the pass between speed and the amounts of frequency offset is:
fd＝-(f0*v/c)*cos(theta)
Wherein, fd=frequency deviation; F0=centre frequency (, can calculate) with 2.000Ghz for 3G; V=actual motion speed; The c=light velocity, 3 * 10^8 meter per second; The direction of motion of theta=UE and the angle between the signal propagation direction are worked as theta=0, and UE is away from NODEB in expression, and fd is a negative value.Work as theta=180, expression UE points to NODEB, fd be on the occasion of.
Because frequency deviation surpasses certain degree, will cause the pernicious decline of communication quality, and the carrier extract meeting inaccuracy that becomes.Usually comprise the dedicated channel demodulation chip in the base station system, connect to the received signal and expand and the decline correction, to improve the effective power of signal.But for the Doppler frequency shift that because at a high speed (as Hispanic high-speed railway, time scooter 250Km/h) causes, the correctly demodulation of PRACH channel.
Specifically, under Gaussian channel, the speed per hour of 240km, the frequency deviation of 2*fd are 889Hz, detection of preamble decreased performance 3dB; During the 600Hz frequency deviation, message demodulation decreased performance 4dB; During the 650Hz frequency deviation, demodulation performance decline 6dB; During the 700Hz frequency deviation, demodulation performance loses greater than 10dB; Along with frequency deviation increases, demodulation performance sharply descends, during greater than 750Hz, and also correctly demodulation of the infinite increase of signal to noise ratio.
Because terminal such as moves at frequency deviation former thereby that produce, adopt automatic frequency control (Automatic Frequency Control is called for short " AFC ") technology for demodulation at present.AFC is the carrier frequency that is used for following the tracks of and catch the signal that receives from the base station, with reach send consistent with receive frequency.
In cdma system, the AFC technology has two kinds, and difference is that the correction of frequency deviation is to carry out before Multipath searching or after the Multipath searching.If before Multipath searching, will can not be subjected to the influence of frequency deviation in the Multipath searching process at correcting frequency deviation, can improve the accuracy of Multipath searching; Otherwise, after Multipath searching, carry out the complexity that correcting frequency deviation can reduce correcting frequency deviation, because can directly estimate partially and correction at the enterprising line frequency of phase point in these footpaths according to multipath information.Consider the requirement of systematic function, generally adopt the way of before Multipath searching, carrying out correcting frequency deviation.
The AFC method of estimation that adopts comprises following steps at present:
It is relevant to slide on a segment signal of input by correlated series, obtains the multiple delay profile of son (ComplexDelay Profile is called for short " CDP ");
Carry out AFC at all phase points and estimate, obtain frequency offset estimation result;
All phase points are rectified a deviation obtains complete CDP, can rectify a deviation to this phase point according to the frequency offset estimation result of phase point here, and the sub-CDP stack that will obtain after will rectifying a deviation again calculates complete CDP;
Rated output delay profile (Power Delay Profile is called for short " PDP "), this PDP has been the PDP that removes frequency deviation, can be used for Multipath searching and judgement, improves the multipath performance.
In actual applications, there is following problem in such scheme: the AFC technology is not in all cases, can both effectively subdue the frequency deviation that Doppler effect produces, and communication quality can not get ensureing.
Cause the main cause of this situation to be, because the PRACH channel is a discrete channel, and message-length only is 10ms or 20ms, be no more than at moving velocity of terminal under the situation of 200Km/h, the AFC technology is not clearly for the rectifying effect of consequent Doppler frequency shift, sometimes even side effect can occur.And, cause this method also not have commercial case at present basically owing to reasons such as AFC technology algorithm completeness shortcomings.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of mobile communication system and method thereof of reducing up channel Doppler effect, makes Doppler effect can effectively be subdued the influence of up channel.
For achieving the above object, the invention provides a kind of mobile communication system of reducing up channel Doppler effect, comprise at least one processing module, uplink channel signals handled, at least one described processing module that influenced by Doppler effect, comprise with cascade system:
At least two branch roads, each branch road carries out correcting frequency deviation with different default frequency deviations to the uplink channel signals from upper level;
The chooser module is used for selecting a road optimum signal to output to next stage from the output of described each branch road.
Wherein, the described processing module that contains described branch road and chooser module is a baseband processing module, is used for up baseband signal is handled.
In this external described system, described chooser module is selected optimum signal according to one of following index or its combination in any:
Signal to noise ratio and Block Error Rate.
In this external described system, the described processing module that contains described branch road and chooser module is a radio-frequency module, is used for up radiofrequency signal is handled.
In this external described system, described branch road is an odd number, and the default frequency deviation of one of them is 0, the positive and negative in twos symmetry of the default frequency deviation of other branch road.
In this external described system, described mobile communication system is a broadband CDMA system.
In this external described system, described up channel is Physical Random Access Channel or dedicated channel.
The present invention also provides a kind of method of mobile communication of reducing up channel Doppler effect, comprises following steps:
In at least two branch roads arranged side by side, respectively the uplink channel signals from upper level is carried out correcting frequency deviation with different default frequency deviations;
From the output of described each branch road, select a road optimum signal to output to next stage.
Wherein, the uplink channel signals of described branch road processing is baseband signal or radiofrequency signal.
In this external described method, described up channel is Physical Random Access Channel or dedicated channel.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, to import a plurality of branch roads from the uplink channel signals of upper level, each branch road is according to different default frequency deviations, respectively it is carried out in various degree correcting frequency deviation, and comparison each tributary signal behind correcting frequency deviation, one road signal of optimum is exported to next stage.
Correcting frequency deviation and Optimal Signals to uplink channel signals are selected both can realize in baseband portion, also can realize in radio frequency part.
The branch road that uplink channel signals is carried out correcting frequency deviation has odd number, and the default frequency deviation of one of them branch road is 0, the default frequency deviation of all the other each branch roads in pairs, one positive one negative, symmetry each other.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly because to same uplink channel signals, according to different default frequency deviations fixing correcting frequency deviation repeatedly, even the frequency deviation of signal is because time or position and at times strong and at other times weak, always the signal that a branch road output is arranged near primary signal, has guaranteed the quality of output signals by correcting frequency deviation, from having improved communication quality in essence, and use fixedly correcting frequency deviation can further save cost.
According to the branch road of different situations setting varying number, under the situation of signal frequency deviation, less branch road can be set than unanimity, when signal is carried out suitable correcting frequency deviation, saved Limited resources.Than under the complicated situation, several branch roads can be set at signal frequency deviation more,, finish optimum correcting frequency deviation, make output signal, make signal quality more secure as much as possible near primary signal by setting in advance different correcting frequency deviation amounts.
By the default frequency deviation of each branch road is set in pairs, the frequency deviation that produces in uncertain uplink channel signals is just or under the negative situation, has enlarged the scope of correcting frequency deviation.
Because correcting frequency deviation and Optimal Signals to uplink channel signals are selected both can realize in baseband portion, also can realize in radio frequency part, make the present invention more flexible in the use.
Description of drawings
Fig. 1 is the structure chart of data in the prior art PRACH channel;
Fig. 2 is a prior art frequency deviation schematic diagram;
Fig. 3 is the mobile communication system structure chart according to the first embodiment of the invention reducing up channel Doppler effect;
Fig. 4 is the method for mobile communication flow chart according to the first embodiment of the invention reducing up channel Doppler effect.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, will be from least two branch roads of uplink channel signals input of upper level, each branch road is default with different frequency deviations, each branch road carries out exporting behind the correcting frequency deviation to this uplink channel signals according to default frequency deviation separately, the output signal that compares each branch road, and therefrom select a road optimum signal to output to next stage.
Below according to principle of the present invention, the mobile communication system of the first execution mode reducing up channel Doppler effect of the present invention is described.
As shown in Figure 3, the mobile communication system of reducing up channel Doppler effect of the present invention comprises a plurality of processing modules, with cascade system uplink channel signals is handled, processing module is a baseband processing module in the present embodiment, is used for up baseband signal is handled.In at least one baseband processing module that influenced by Doppler effect, comprise at least two branch roads, be used for the uplink channel signals from upper level being carried out correcting frequency deviation according to different default frequency deviations.Also comprise the chooser module, be used for selecting a road optimum signal to output to next stage from the output of each branch road.
Specifically, upper level is imported uplink channel signals each branch road of baseband processing module, usually branch road is an odd number, the default frequency deviation of one of them is 0, the positive and negative in twos symmetry of the default frequency deviation of other branch road, promptly when the default frequency deviation of a branch road for just, the default frequency deviation that another branch road is then arranged is for bearing.Each branch road will be imported signal wherein respectively, carry out correcting frequency deviation according to different default frequency deviations, promptly a branch road does not carry out correcting frequency deviation to signal, and signal is carried out positive deflection correction according to default frequency deviation to all the other branch roads or negative bias is corrected, and the signal after will correcting outputs to the chooser module.The chooser module is selected index according to it, selects a road optimum signal from each road signal, and this signal is outputed to next stage.
More than the system of present embodiment is illustrated, the method to execution mode describes in detail below.
As shown in Figure 4, in step 410, upper level is with each branch road of uplink channel signals input processing module.Specifically, before the signal input is arranged, at first be the default different frequency deviation of each branch road.Usually the branch road that comprises in the processing module is an odd number, and it is 0 that one of them frequency deviation is set in advance, the positive and negative in twos symmetry of the default frequency deviation of other branch road.The frequency deviation that produces in uncertain uplink channel signals is just or under the negative situation, has enlarged the scope of correcting frequency deviation.Such as centre frequency is 2.000000GHz, comprises three branch roads in the processing module, and it is 0 that the frequency deviation of branch road one is set in advance, and the frequency deviation of branch road two sets in advance and is that 1000Hz, the frequency deviation of branch road three set in advance and is-1000Hz.Afterwards, when needed, upper level then enters step 420 with uplink channel signals input each branch road through being provided with.
In step 420, each branch road carries out correcting frequency deviation according to default frequency deviation to uplink channel signals.At above-mentioned example, three branch roads carry out correcting frequency deviation according to default frequency deviation separately to the uplink channel signals from upper level, branch road one is because default frequency deviation is 0, this signal is not carried out correcting frequency deviation, directly output, branch road two is because default frequency deviation is 1000Hz, 2.000000GHz adds 1000Hz with centre frequency, promptly be that benchmark is handled with 2.000001GHz, output afterwards, branch road three is because default frequency deviation is-1000Hz that 2.000000GHz deducts 1000Hz with centre frequency, promptly be that benchmark is handled with 1.999999GHz, output again.Article three, the data of branch road all output to the chooser module.Because the branch road that is provided with is less, when signal is carried out suitable correcting frequency deviation, has saved Limited resources.And at signal frequency deviation than under the complicated situation, several branch roads also can be set more, by setting in advance different correcting frequency deviations, finish optimum correcting frequency deviation, make output signal as much as possible near primary signal, make quality of output signals more secure, and, can further save cost owing to use fixedly correcting frequency deviation.
In step 430, the chooser module selects a road optimum signal to output to next stage from the output of each branch road.Specifically, the chooser module is selected index according to it, as signal to noise ratio (SignalNoiseratio, abbreviation " SNR "), Block Error Rate (Block Error Rate, be called for short " BLER ") etc. index or it is combined to form specific index, from each road signal, select a road optimum signal, and this signal is outputed to next stage.Because to same uplink channel signals, carry out repeatedly correcting frequency deviation according to different default frequency deviations, even the frequency deviation of signal is because time or position are at times strong and at other times weak, can therefrom select output signal near primary signal, guaranteed quality, from having improved communication quality in essence by the correcting frequency deviation output signal.
For instance, as default frequency deviation is positive and negative 1000Hz, and then when received signal produced the fixedly frequency deviation of 1600Hz, performance loss was equivalent to the loss of 600Hz frequency deviation fully, therefore adopting should pre-correction algorithm, is effectively to the raising of pilot capture performance and message demodulation performance.
What deserves to be mentioned is, mobile communication system described in the present embodiment is a broadband CDMA system, the described processing module that contains branch road and chooser module is a baseband processing module, described uplink channel signals is a baseband signal, described up channel is PRACH or dedicated channel (Dedicate Channel is called for short " DCH ").
The mobile communication system of second embodiment of the invention reducing up channel Doppler effect and first execution mode are roughly the same, the processing module that its difference only is to contain in first execution mode branch road and chooser module is a baseband processing module, uplink channel signals is a baseband signal, and the processing module that contains branch road and chooser module in the present embodiment is a radio-frequency module, be used for uplink channel signals is handled, the uplink channel signals of handling is a radiofrequency signal, be each branch road that radio-frequency module passes through to be comprised, the radiofrequency signal from upper level carried out correcting frequency deviation with different default frequency deviations.Because correcting frequency deviation and Optimal Signals to uplink channel signals are selected both can finish in baseband portion, also can finish in radio frequency part, make the present invention more flexible in the use.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. the mobile communication system of a reducing up channel Doppler effect comprises at least one processing module, with cascade system uplink channel signals is handled, and it is characterized in that, comprises at least one described processing module that influenced by Doppler effect:
At least two branch roads, each branch road carries out correcting frequency deviation with different default frequency deviations to the uplink channel signals from upper level;
The chooser module is used for selecting a road optimum signal to output to next stage from the output of described each branch road.
2. the mobile communication system of reducing up channel Doppler effect according to claim 1 is characterized in that, the described processing module that contains described branch road and chooser module is a baseband processing module, is used for up baseband signal is handled.
3. the mobile communication system of reducing up channel Doppler effect according to claim 2 is characterized in that, described chooser module is selected optimum signal according to one of following index or its combination in any:
Signal to noise ratio and Block Error Rate.
4. the mobile communication system of reducing up channel Doppler effect according to claim 1 is characterized in that, the described processing module that contains described branch road and chooser module is a radio-frequency module, is used for up radiofrequency signal is handled.
5. the mobile communication system of reducing up channel Doppler effect according to claim 1 is characterized in that, described branch road is an odd number, and the default frequency deviation of one of them is 0, the positive and negative in twos symmetry of the default frequency deviation of other branch road.
6. according to the mobile communication system of each described reducing up channel Doppler effect in the claim 1 to 3, it is characterized in that described mobile communication system is a broadband CDMA system.
7. the mobile communication system of reducing up channel Doppler effect according to claim 6 is characterized in that, described up channel is Physical Random Access Channel or dedicated channel.
8. the method for mobile communication of a reducing up channel Doppler effect is characterized in that, comprises following steps:
In at least two branch roads arranged side by side, respectively the uplink channel signals from upper level is carried out correcting frequency deviation with different default frequency deviations;
From the output of described each branch road, select a road optimum signal to output to next stage.
9. the method for mobile communication of reducing up channel Doppler effect according to claim 8 is characterized in that, the uplink channel signals that described branch road is handled is baseband signal or radiofrequency signal.
10. according to Claim 8 or the method for mobile communication of 9 described reducing up channel Doppler effect, it is characterized in that described up channel is Physical Random Access Channel or dedicated channel.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332942A (en) * | 2010-07-12 | 2012-01-25 | 鼎桥通信技术有限公司 | Method and equipment for presetting downlink frequency offset |
| CN101399561B (en) * | 2007-09-27 | 2012-05-23 | 中兴通讯股份有限公司 | Uplink access signal capturing method based on signal pre-processing technique |
| CN103516645A (en) * | 2012-06-26 | 2014-01-15 | 泉州泽仕通科技有限公司 | Method for covering two-way multi-signal processing of high-speed moving object |
| CN103929221A (en) * | 2013-01-11 | 2014-07-16 | 正文科技股份有限公司 | Frequency compensation device and frequency compensation method |
-
2006
- 2006-02-08 CN CN 200610004099 patent/CN1859039A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399561B (en) * | 2007-09-27 | 2012-05-23 | 中兴通讯股份有限公司 | Uplink access signal capturing method based on signal pre-processing technique |
| CN102332942A (en) * | 2010-07-12 | 2012-01-25 | 鼎桥通信技术有限公司 | Method and equipment for presetting downlink frequency offset |
| CN103516645A (en) * | 2012-06-26 | 2014-01-15 | 泉州泽仕通科技有限公司 | Method for covering two-way multi-signal processing of high-speed moving object |
| CN103516645B (en) * | 2012-06-26 | 2016-06-29 | 泉州泽仕通科技有限公司 | A kind of two-way multi signal of high-speed mobile unit processes covering method |
| CN103929221A (en) * | 2013-01-11 | 2014-07-16 | 正文科技股份有限公司 | Frequency compensation device and frequency compensation method |
| CN103929221B (en) * | 2013-01-11 | 2018-08-24 | 正文科技股份有限公司 | Frequency compensation device and its frequency compensation method |
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