CN100574296C - The method and apparatus that signal is handled - Google Patents

The method and apparatus that signal is handled Download PDF

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CN100574296C
CN100574296C CNB2005101159158A CN200510115915A CN100574296C CN 100574296 C CN100574296 C CN 100574296C CN B2005101159158 A CNB2005101159158 A CN B2005101159158A CN 200510115915 A CN200510115915 A CN 200510115915A CN 100574296 C CN100574296 C CN 100574296C
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signal
multipath information
detection
preamble
demodulation
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CN1866940A (en
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汪少波
李化加
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XFusion Digital Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The present invention relates to a kind of method and apparatus that signal is handled, its core is: the baseband signal that receives is carried out detection of preamble, export detected effective multipath information; Carry out decision process according to described detected effective multipath information, and distribute the multipath information of the signal of needs demodulation according to the result of decision process; Separate according to the signal of the multipath Information Selection respective branch of described distribution and to be in harmonious proportion decoding.By the present invention, can on the basis of the baseband signal that receives, directly carry out demodulation filtering, do not need to store long demodulating data and carry out possible signal frequency deviation correction, thereby reduce the storage resources of hardware and the time delay of data processing.And, the present invention considers after detection of preamble the branch road that has effective multipath information all to be carried out message demodulation, so can be in the detection of preamble process, the demodulation performance that causes selecting wrong demodulation branch road to bring signal owing to false-alarm descends, so the present invention can guarantee the access performance of signal.

Description

The method and apparatus that signal is handled
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and apparatus that signal is handled.
Background technology
In the mobile communication system, owing to relatively moving of UE and base station, the frequency of received signal will be expanded, and be called Doppler effect.In most of high speed scene, the signal between base station and the UE is propagated and is the direct-view footpath, and Doppler effect directly is presented as totally moving of received signal frequency.When base station and super expressway were very near, the angle of user's moving direction and signal propagation direction can be very little, and signal receives will produce bigger frequency deviation.
Frequency deviation produces schematic diagram as shown in Figure 1, and with road distance when very near, the angle of user's moving direction and signal propagation direction is very little when the base station, and the signal reception will produce bigger frequency deviation.The base station signal transmission frequency is f 0, UE is away from the base station, and UE receives downstream signal will bring frequency deviation f d:
f d = f C * v * cos θ , F is the carrier frequency of WCDMA, and C is a propagation velocity of electromagnetic wave, and v is a moving velocity of terminal, and θ is the angle of direction of relative movement and signal propagation direction.
Lock this frequency reception signal f 0-f dThe back sends upward signal, and base station received signal its transmission signal relatively will produce 2*f dFrequency deviation.For the translational speed of 250km/h, 2*f dCorresponding maximum frequency deviation value is 926Hz.
The WCDMA system adopts the detection mode of coherent demodulation, require receiving terminal the demodulation carrier wave must with the modulated carrier of transmitting terminal with homophase frequently, if exist certain between base station carrier and the received signal than large frequency-difference, the selection of channel estimating smooth length is difficult in filtering noise and follows the tracks of fast and obtains balance between the channel fading, the demodulation performance of receiving terminal may seriously descend, even causes normally demodulation of received signal.And for this self-interference of WCDMA system, the decline of demodulation performance means that the signal to noise ratio of requirement increases, the reduction of power system capacity and covering.Therefore, in order to guarantee high speed scene capacity and to cover index, adopt automatic frequency control (Automatic Frequency Control; AFC) algorithm improves the demodulation performance of receiving terminal under the high speed scene.
Wideband Code Division Multiple Access (WCDMA) (Wide-band Code Division Multiple Access; WCDMA) physical accidental inserts (Physical Random Access Channel in the system; PRACH) channel comprises leading and two parts of message, and as shown in Figure 2, UE sends the 4096chips targeting signal earlier, and before the base station detected targeting signal, UE adopted the mode of power climbing to continue to send; After the base station detects targeting signal, by catch indication (Acquisition Indicator Channel, AICH) channel sends and to catch indication (Acquisition Indicator; AI) information, UE continues to send the message part of 10ms or 20ms more subsequently.The detection of preamble process can obtain user's multipath information, and for reducing storage and the processing delay that the Multipath searching process is brought, several time slots or whole time slot can adopt the multipath information of detection of preamble output before the message demodulation.
For up PRACH channel, system does not have UE to send the prior information of signal frequency deviation, and the time that sends the PRACH signal each time is shorter, and this just requires system's estimated signal frequency deviation in the short period of time, carries out coherent detection or demodulation after correcting to received signal again.
Prior art one related to the present invention is the present frequency offset estimating commonly used and the handling process of correction, as shown in Figure 3:
With the base band data of known transmission signal and reception mate relevant after, the phase place of searching for effective multipath signal; According to the phase place that searches, each effective multipath signal is carried out demodulation filtering; And utilize known transmission calculated signals channel fading once more, ask for frequency deviation by the cross product of front and back symbol decline; After the filtering each footpath signal frequency deviation is corrected; Signal after correcting is detected or demodulation.
By the technical scheme of prior art one as can be seen, there is following shortcoming in it:
1, before carrying out correcting frequency deviation to received signal, must store the demodulating data of certain-length, need the certain hardware store resource and the time delay of data processing.
From signal processing flow, there is a time delay in the frequency offset estimating of received signal to correcting frequency deviation, if send Chief Signal Boatswain time continued presence, can correct the frequency deviation of back a period of time received signal with the frequency offset estimating of received signal for the previous period.But because it is shorter to insert signal sending time, leading have only 4096chips, and message also has only 10ms or 20ms, and therefore before carrying out correcting frequency deviation to received signal, demodulating data that must the storage certain-length is waited for the output of frequency offset estimating.
2, when carrying out filtering again after the continuous symbol frequency offset estimating, need the longer demodulating data of storage, strengthened the storage resources of hardware and the time delay of data processing.
Obtain more reliable frequency deviation if desired, can estimate to carry out filtering again after the frequency deviation to continuous symbol, need the longer demodulating data of storage like this, but there is special requirement the base station to the signal processing time delay, particularly will in time detect leading and feeding back downlink AI index signal, so hardware store resource and processing delay require to have limited the performance of frequency offset estimating.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus that signal is handled, by the present invention, can on the basis of the baseband signal that receives, directly carry out demodulation filtering, not need to store long demodulating data, thereby reduced the storage resources of hardware and the time delay of data processing.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method that signal is handled, it comprises:
A, the baseband signal that receives is carried out detection of preamble, export detected effective multipath information;
B, carry out decision process, and distribute the multipath information of the signal of needs demodulation according to the result of decision process according to described detected effective multipath information;
C, separate according to the signal of the multipath Information Selection respective branch of described distribution and to be in harmonious proportion decoding, and be in harmonious proportion decoding CRC check result, export correct decoding information according to separating accordingly.
Wherein, described steps A specifically comprises:
A1, each the roadbed band signal that receives is carried out the detection of preamble of access channel, the corresponding effectively multipath information of output respectively;
Or,
A2, in each the roadbed band signal that receives, select a road carrying out pre-mixing and handle wherein, obtain the multiple branch circuit baseband signal after pre-mixing is handled;
A3, respectively each branch road baseband signal of described acquisition is carried out Access Channel Preamble and detect the corresponding effectively multipath information of output.
Wherein, described steps A 1 specifically comprises:
Be each roadbed band signal configuration different scrambling codes, and respectively each the roadbed band signal that receives in the access channel carried out detection of preamble according to the different scrambling codes of described configuration, the corresponding effectively multipath information of output.
Wherein, described steps A 3 specifically comprises:
Be the identical scrambler of each branch road baseband signal configuration, and respectively each branch road baseband signal of described acquisition carried out detection of preamble according to the identical scrambler of described configuration, the corresponding effectively multipath information of output.
Wherein, described step B specifically comprises:
B1, the energy to the effective multipath information in each road superposes respectively, obtains the signal to noise ratio of each road signal;
Whether B2, the signal to noise ratio of judging each road signal respectively surpass the detection threshold of setting, and when confirming to surpass the detection threshold of setting, then catch the signal of respective paths, and distribute the multipath information of the signal that need carry out demodulation;
Or,
B3, the energy to the effective multipath information in each road superposes respectively, obtains the signal to noise ratio of each road signal;
B4, the signal to noise ratio of each road signal of described acquisition is compared the signal to noise ratio that the value of selecting is maximum;
B5, judge that whether the value of the described signal to noise ratio of selecting surpasses the detection threshold of setting, when confirming to surpass the detection threshold of setting, then catch all and carry out each tributary signal after pre-mixing is handled, and distribute the multipath information that to carry out the signal of demodulation accordingly; Or,
Whether the value of judging the described signal to noise ratio of selecting surpasses the detection threshold of setting, and when confirming to surpass the detection threshold of setting, then catches the tributary signal of the maximum signal to noise ratio correspondence of described value, and the multipath information of distributing described tributary signal.
Wherein, described step C specifically comprises:
C1, according to the multipath information of described distribution, select the baseband signal of the respective branch of coupling, and it separated be in harmonious proportion decoding, output decode results and CRC check result separately respectively;
Or,
C2, according to the multipath information of described distribution, select all and carry out each tributary signal after pre-mixing is handled, and it is separated be in harmonious proportion decoding, output decode results and CRC check result separately respectively;
C3, select correct the CRC check decode results and the CRC check result of the tributary signal of correspondence as a result, and output.
Wherein, described method describedly judges whether the value of the described signal to noise ratio of selecting surpasses the detection threshold of setting carrying out, when confirming to surpass the detection threshold of setting, then catch the tributary signal of the maximum signal to noise ratio correspondence of described value, and distribute after the multipath information of described tributary signal, described step C specifically comprises:
C4, according to the multipath information of the described tributary signal that distributes, select described tributary signal, and it is separated be in harmonious proportion decoding, export corresponding decode results and CRC check result.
Wherein, among the step C1, and respectively its process of separating mediation decoding is specifically comprised:
Be respectively the described tributary signal distribution scrambler of selecting separately, separate then to be in harmonious proportion and decipher.
Wherein, among the step C2, respectively its process of separating mediation decoding is specifically comprised:
Be respectively the described tributary signal of selecting and distribute identical scrambler, separate then to be in harmonious proportion and decipher.
The invention provides a kind of device that signal is handled, it comprises:
Detection of preamble unit, decision process unit and demodulation decoding unit;
Described detection of preamble unit carries out detection of preamble to receiving signal, and exports detected effective multipath information and give described decision process unit; Described decision process unit carries out decision process according to described detected result, and distributes the multipath information of the signal of needs demodulation according to the decision process result, then it is sent to the demodulation coding unit; Described demodulation coding unit is separated to be in harmonious proportion according to the signal of the multipath Information Selection respective branch of described distribution and is deciphered.
Wherein said device also comprises:
Pretreatment unit be used for selecting a wherein roadbed band signal of access channel to carry out pre-mixing processing, and each road signal that pre-mixing processing back is obtained sends the detection of preamble unit to;
Or transmit the multichannel baseband signal that receives and give the detection of preamble unit.
Wherein, described pretreatment unit comprises: switch unit and pre-mixing processing unit;
Switch unit is used to switch the multichannel baseband signal to pre-mixing processing unit, or wherein one road signal that switches in the multichannel baseband signal arrives pre-mixing processing unit;
When described pre-mixing processing unit receives the multichannel baseband signal, then transmit the multichannel baseband signal that receives and give the detection of preamble unit; When described pre-mixing processing unit receives a roadbed band signal, then this roadbed band signal is carried out pre-mixing and handle, and the pre-mixing signal of output multichannel is given the detection of preamble unit.
Wherein, described device also comprises:
Demodulation coding is decision unit as a result, is used to judge whether the CRC check sign indicating number of demodulation coding unit output is correct, when affirmation is correct, then exports described correct CRC check sign indicating number, and the decode results of the signal of the corresponding branch road of described check code; Otherwise, the indication information of output decoding error.
As seen from the above technical solution provided by the invention, method of the present invention is carried out detection of preamble to the baseband signal that receives, and exports detected effective multipath information; Carry out decision process according to described detected effective multipath information, and distribute the multipath information of the signal of needs demodulation according to the result of decision process; Separate according to the signal of the multipath Information Selection respective branch of described distribution and to be in harmonious proportion decoding, and be in harmonious proportion decoding CRC check result, export correct decoding information according to separating accordingly.By the present invention, can on the basis of the baseband signal that receives, directly carry out demodulation filtering, do not need to store long demodulating data and carry out possible signal frequency deviation correction, thereby reduce the storage resources of hardware and the time delay of data processing; And, the present invention considers after detection of preamble, the branch road that has effective multipath information is all carried out message demodulation, so can be in the detection of preamble process, because false-alarm causes selecting wrong demodulation branch road, thereby bring the demodulation performance of signal to descend, particularly when the no frequency deviation of received signal itself or frequency deviation were very little, the present invention can guarantee the access performance of signal.
Moreover the present invention is by being provided with multichannel message demodulation branch road, and the frequency deviation that can adapt in a big way changes.For example Signal Processing separately can be tolerated the frequency deviation of positive and negative 500Hz, and the frequency configuration of pre-mixing is 1000Hz, 0Hz and-1000Hz, system will tolerate that the excursion of receiving signal frequency offset is positive and negative 1500Hz.
Moreover by the present invention, static or at a slow speed under the mobile environment, the processing of one or more access channel can be supported in the base station, under the wireless environment that has high-speed mobile UE, handle support one road access channel by the pre-mixing of multichannel, therefore by flexible configuration, reduced hardware resource and realized cost.
Description of drawings
Fig. 1 is the schematic diagram that present communication system intermediate frequency oblique presentation is given birth to;
Fig. 2 is the schematic diagram that sends information in the background technology in the PRACH channel;
Fig. 3 is the process chart of frequency offset estimating and correction in the prior art one;
Fig. 4 is the handling process of first embodiment provided by the invention;
Fig. 5 is the handling process of second embodiment provided by the invention;
Fig. 6 is the handling process of the 3rd embodiment provided by the invention;
Fig. 7 is the structural principle schematic diagram of the 4th embodiment provided by the invention;
Fig. 8 is the structural principle schematic diagram of the 5th embodiment provided by the invention.
Embodiment
The invention provides a kind of method and apparatus that signal is handled, its core is: the baseband signal that receives is carried out detection of preamble, export detected effective multipath information; Carry out decision process according to described detected effective multipath information, and distribute the multipath information of the signal of needs demodulation according to the result of decision process; Separate according to the signal of the multipath Information Selection respective branch of described distribution and to be in harmonious proportion decoding, and be in harmonious proportion decoding CRC check result, export correct decoding information according to separating accordingly.
First embodiment provided by the invention is the technical scheme that the signal in the PARCH channel that receives is adopted pre-correction, is example with three tunnel pre-mixing signals, its handling process as shown in Figure 4:
Select a road carrying out pre-mixing and handle wherein in step 101, each roadbed band signal of in access channel, receiving, obtain the multiple branch circuit baseband signal after pre-mixing is handled.
The I/O channel of pre-mixing signal is fixed, and the baseband signal three tunnel pre-mixing signals that single channel is imported are multiplied by respectively With
Figure C20051011591500132
After, by fixing output channel output, ω 1, ω 2And ω 3Can be provided with flexibly, for example+500Hz, 0Hz and-500Hz.
Detection of preamble is carried out to each branch road baseband signal of described acquisition respectively in step 102, base station, the corresponding effectively multipath information of output.
The base station is respectively the identical scrambler of each branch road baseband signal configuration, and respectively each branch road baseband signal of described acquisition is carried out detection of preamble according to the identical scrambler of described configuration, the corresponding effectively multipath information of output.
Through after the above-mentioned steps, the present invention can obtain detected effective multipath information, then according to described detected effective multipath information, selects the branch road of signal to noise ratio maximum to do prize judgment; If surpass detection threshold, then sending and catching indication (AI) be positive indication, and according to effective multipath information of this branch road, selects the signal of this branch road to separate mediation and deciphers.Specific implementation process comprises the steps:
Step 103, the energy to the effective multipath information in each road superposes respectively, obtains the signal to noise ratio of each road signal, and the signal to noise ratio with each road signal of described acquisition compares the signal to noise ratio that the value of selecting is maximum then.And judge whether the value of the described signal to noise ratio of selecting surpasses the detection threshold of setting, when confirming to surpass the detection threshold of setting, then catches the tributary signal of the maximum signal to noise ratio correspondence of described value, and the multipath information of distributing described tributary signal.
Step 104, according to the multipath information of the described branch road that distributes, select the signal of described branch road, and it is separated be in harmonious proportion decoding, export corresponding decode results and CRC check result.
In the first embodiment of the present invention, hardware realizes generally not having too many flexibility, particularly chip is realized, Communication System Design should be supported different wireless environments, when the access performance of high-speed mobile environment is supported in the base station, must consider the multichannel Frequency mixing processing, when therefore multiple signals being carried out detection of preamble, to consume more hardware resource, cost is than higher.In addition, because the signal to noise ratio snr of targeting signal has just embodied instantaneous energy, so iff existence for fear of false-alarm, select the branch road of targeting signal SNR maximum to carry out demodulation, the branch road that may cause carrying out demodulation is not best branch road, for example the frequency deviation of received signal is 0, because noise stochastic behaviour, may cause+500Hz or-the SNR maximum of the branch road at 500Hz mixed frequency signal place, can make restituted signal additionally introduce the fixedly frequency deviation of 500Hz like this, thereby cause the demodulation performance of signal to descend.
Second embodiment provided by the invention as shown in Figure 5, comprising:
Detection of preamble is carried out to each the roadbed band signal that receives in the access channel respectively in step 201, base station, the corresponding effectively multipath information of output.
Be each roadbed band signal configuration different scrambling codes, and respectively each the roadbed band signal that receives in the access channel carried out detection of preamble according to the different scrambling codes of described configuration, the corresponding effectively multipath information of output.
Step 202, the energy to the effective multipath information in each road superposes respectively, obtains the signal to noise ratio of each road signal;
Whether step 203, the signal to noise ratio of judging each road signal respectively surpass the detection threshold of setting, and when confirming to surpass the detection threshold of setting, then catch the signal of respective paths, and distribute the multipath information of the signal that need carry out demodulation;
Step 204, according to the multipath information of described distribution, select the baseband signal of the respective branch of coupling, and be respectively the described tributary signal distribution scrambler of selecting separately, then it is separated to be in harmonious proportion and decipher output decode results and CRC check result separately;
The 3rd embodiment provided by the invention as shown in Figure 6, comprising:
Select a road carrying out pre-mixing and handle wherein in each roadbed band signal that step 301, base station receive in access channel, obtain the multiple branch circuit baseband signal after pre-mixing is handled.
Step 302, respectively each branch road baseband signal of described acquisition is carried out detection of preamble, the corresponding effectively multipath information of output.
Step 303, the energy to the effective multipath information in each road superposes respectively, obtain the signal to noise ratio of each road signal, signal to noise ratio with each road signal of described acquisition compares then, the signal to noise ratio that the value of selecting is maximum, and whether the value of judging the described signal to noise ratio of selecting surpasses the detection threshold of setting, when the detection threshold confirm to surpass set, then catch all and carry out each tributary signal after pre-mixing is handled, and distribute the multipath information that to carry out the signal of demodulation accordingly.
Step 304, according to the multipath information of described distribution, select all and carry out each tributary signal after pre-mixing is handled, and be respectively the described identical scrambler of selecting of tributary signal distribution, then it is separated to be in harmonious proportion and decipher output decode results and CRC check result separately;
Step 305, select correct the CRC check decode results and the CRC check result of the tributary signal of correspondence as a result, and output.
From the handling process of the second embodiment of the present invention as can be seen, it is to separate at a plurality of independently baseband signals to be in harmonious proportion decoding and to handle, for example the baseband signal of 3 sub-district access channels, the perhaps baseband signal of 3 of 1 sub-district access channels.
From the handling process of the third embodiment of the present invention as can be seen, it supports the processing of an access channel high speed frequency deviation, passes through ω 1, ω 2And ω 3The bigger frequency deviation region of configuration support.
At device of the present invention, the invention provides the 4th embodiment, as shown in Figure 7, comprising:
Detection of preamble unit, decision process unit and demodulation decoding unit;
Described detection of preamble unit carries out detection of preamble to receiving signal, and exports detected effective multipath information and give described decision process unit; Described decision process unit carries out decision process according to described detected result, and distributes the multipath information of the signal of needs demodulation according to the decision process result, then it is sent to the demodulation coding unit; Described demodulation coding unit is separated to be in harmonious proportion according to the signal of the multipath Information Selection respective branch of described distribution and is deciphered.
At device of the present invention, the invention provides the 5th embodiment, as shown in Figure 8, comprising:
Pretreatment unit, detection of preamble unit, decision process unit, distribution multipath information unit, demodulation coding unit and demodulation decode results decision unit switch unit; Wherein said pretreatment unit comprises Frequency mixing processing unit and switch unit.
Switch unit is used to switch the multichannel baseband signal to pre-mixing processing unit, or wherein one road signal that switches in the multichannel baseband signal arrives pre-mixing processing unit.
When described pre-mixing processing unit receives the multichannel baseband signal, then transmit the multichannel baseband signal that receives and give the detection of preamble unit; When described pre-mixing processing unit received a roadbed band signal, then the signal to described branch road carried out pre-mixing processing, and the pre-mixing signal of output multichannel is given the detection of preamble unit.
Described detection of preamble unit carries out detection of preamble to the received signal, and exports detected effective multipath information and give described decision process unit.Known scrambler with the signal that receives in testing process is done relevant treatment, when switch unit switches the multichannel baseband signal to pre-mixing processing unit, then disposes different scramblers for each tributary signal in testing process; When switch unit switches wherein one road signal in the multichannel baseband signal to pre-mixing processing unit, then in testing process, dispose identical scrambler for each tributary signal.
Described decision process unit carries out decision process according to described detected result, and distributes the multipath information of the signal of needs demodulation according to the decision process result, then it is sent to the demodulation coding unit.When distribution needs the multipath information of signal of demodulation, can catch the tributary signal of signal to noise ratio maximum according to court verdict, the multipath information of distributing the signal of needs demodulation then according to the tributary signal that captures, also can select all tributary signals, distribute the multipath information of the signal of needs demodulation then according to all tributary signals that capture according to court verdict through pre-mixing processing unit output.
Described demodulation coding unit is separated to be in harmonious proportion according to the signal of the multipath Information Selection respective branch of described distribution and is deciphered, and exports corresponding decode results and CRC check result.Separate to be in harmonious proportion at j and do relevant treatment with the known scrambler of the signal that receives in the process of decoding, when switch unit switches the multichannel baseband signal to pre-mixing processing unit, then in this process, be the different scrambler of each tributary signal distribution; When switch unit switches wherein one road signal in the multichannel baseband signal to pre-mixing processing unit, then in this process, be the identical scrambler of each tributary signal distribution.
When a plurality of decode results and CRC check are exported as a result the time in the demodulation coding unit, then by demodulation coding as a result decision unit judge whether the CRC check sign indicating number of exporting the demodulation coding unit correct, when affirmation is correct, then export described correct CRC check sign indicating number, and the decode results of the signal of the corresponding branch road of described check code; Otherwise, the indication information of output decoding error.
As seen from the above technical solution provided by the invention, method of the present invention is carried out detection of preamble to the baseband signal that receives, and exports detected effective multipath information; Carry out decision process according to described detected effective multipath information, and distribute the multipath information of the signal of needs demodulation according to the result of decision process; Separate according to the signal of the multipath Information Selection respective branch of described distribution and to be in harmonious proportion decoding, and be in harmonious proportion decoding CRC check result, export correct decoding information according to separating accordingly.By the present invention, can on the basis of the baseband signal that receives, directly carry out demodulation filtering; Do not need to store long demodulating data and carry out possible signal frequency deviation correction, thereby reduce the storage resources of hardware and the time delay of data processing; And, the present invention considers after detection of preamble, the branch road that has effective multipath information is all carried out message demodulation, so can be in the detection of preamble process, because false-alarm causes selecting wrong demodulation branch road, thereby bring the demodulation performance of signal to descend, particularly when the no frequency deviation of received signal itself or frequency deviation were very little, the present invention can guarantee the access performance of signal.
Moreover the present invention is by being provided with multichannel message demodulation branch road, and the frequency deviation that can adapt in a big way changes.For example Signal Processing separately can be tolerated the frequency deviation of positive and negative 500Hz, and the frequency configuration of pre-mixing is 1000Hz, 0Hz and-1000Hz, system will tolerate that the excursion of receiving signal frequency offset is positive and negative 1500Hz.
Moreover by the present invention, static or at a slow speed under the mobile environment, the processing of one or more access channel can be supported in the base station, under the wireless environment that has high-speed mobile UE, handle support one road access channel by the pre-mixing of multichannel, therefore by flexible configuration, reduced hardware resource and realized cost.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; 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 (13)

1, a kind of method that signal is handled is characterized in that, comprising:
A, the baseband signal that receives is carried out detection of preamble, export detected effective multipath information;
B, carry out decision process, and distribute the multipath information of the signal of needs demodulation according to the result of decision process according to described detected effective multipath information;
C, separate according to the signal of the multipath Information Selection respective branch of described distribution and to be in harmonious proportion decoding, and be in harmonious proportion decoding CRC check result, export correct decoding information according to separating accordingly.
2, method according to claim 1 is characterized in that, described steps A specifically comprises:
A1, each the roadbed band signal that receives is carried out the detection of preamble of access channel, the corresponding effectively multipath information of output respectively;
Or,
A2, in each the roadbed band signal that receives, select a road carrying out pre-mixing and handle wherein, obtain the multiple branch circuit baseband signal after pre-mixing is handled;
A3, respectively each branch road baseband signal of described acquisition is carried out Access Channel Preamble and detect the corresponding effectively multipath information of output.
3, method according to claim 2 is characterized in that, described steps A 1 specifically comprises:
Be each roadbed band signal configuration different scrambling codes, and respectively each the roadbed band signal that receives in the access channel carried out detection of preamble according to the different scrambling codes of described configuration, the corresponding effectively multipath information of output.
4, method according to claim 2 is characterized in that, described steps A 3 specifically comprises:
Be the identical scrambler of each branch road baseband signal configuration, and respectively each branch road baseband signal of described acquisition carried out detection of preamble according to the identical scrambler of described configuration, the corresponding effectively multipath information of output.
5, method according to claim 1 is characterized in that, described step B specifically comprises:
B1, the energy to the effective multipath information in each road superposes respectively, obtains the signal to noise ratio of each road signal;
Whether B2, the signal to noise ratio of judging each road signal respectively surpass the detection threshold of setting, and when confirming to surpass the detection threshold of setting, then catch the signal of respective paths, and distribute the multipath information of the signal that need carry out demodulation;
Or,
B3, the energy to the effective multipath information in each road superposes respectively, obtains the signal to noise ratio of each road signal;
B4, the signal to noise ratio of each road signal of described acquisition is compared the signal to noise ratio that the value of selecting is maximum;
B5, judge that whether the value of the described signal to noise ratio of selecting surpasses the detection threshold of setting, when confirming to surpass the detection threshold of setting, then catch all and carry out each tributary signal after pre-mixing is handled, and distribute the multipath information that to carry out the signal of demodulation accordingly; Or,
Whether the value of judging the described signal to noise ratio of selecting surpasses the detection threshold of setting, and when confirming to surpass the detection threshold of setting, then catches the tributary signal of the maximum signal to noise ratio correspondence of described value, and the multipath information of distributing described tributary signal.
6, method according to claim 1 is characterized in that, described step C specifically comprises:
C1, according to the multipath information of described distribution, select the baseband signal of the respective branch of coupling, and it separated be in harmonious proportion decoding, output decode results and CRC check result separately respectively;
Or,
C2, according to the multipath information of described distribution, select all and carry out each tributary signal after pre-mixing is handled, and it is separated be in harmonious proportion decoding, output decode results and CRC check result separately respectively;
C3, select correct the CRC check decode results and the CRC check result of the tributary signal of correspondence as a result, and output.
7, method according to claim 5, it is characterized in that, described method describedly judges whether the value of the described signal to noise ratio of selecting surpasses the detection threshold of setting carrying out, when confirming to surpass the detection threshold of setting, then catch the tributary signal of the maximum signal to noise ratio correspondence of described value, and distribute after the multipath information of described tributary signal, described step C specifically comprises:
C4, according to the multipath information of the described tributary signal that distributes, select described tributary signal, and it is separated be in harmonious proportion decoding, export corresponding decode results and CRC check result.
8, method according to claim 6 is characterized in that, among the step C1, and respectively its process of separating mediation decoding is specifically comprised:
Be respectively the described tributary signal distribution scrambler of selecting separately, separate then to be in harmonious proportion and decipher.
9, method according to claim 6 is characterized in that, among the step C2, respectively its process of separating mediation decoding is specifically comprised:
Be respectively the described tributary signal of selecting and distribute identical scrambler, separate then to be in harmonious proportion and decipher.
10, a kind of device that signal is handled is characterized in that, comprising:
Detection of preamble unit, decision process unit and demodulation decoding unit;
Described detection of preamble unit carries out detection of preamble to receiving signal, and exports detected effective multipath information and give described decision process unit; Described decision process unit carries out decision process according to described detected result, and distributes the multipath information of the signal of needs demodulation according to the decision process result, then it is sent to the demodulation coding unit; Described demodulation coding unit is separated to be in harmonious proportion according to the signal of the multipath Information Selection respective branch of described distribution and is deciphered.
11, device according to claim 10 is characterized in that, also comprises:
Pretreatment unit be used for selecting a wherein roadbed band signal of access channel to carry out pre-mixing processing, and each road signal that pre-mixing processing back is obtained sends the detection of preamble unit to;
Or transmit the multichannel baseband signal that receives and give the detection of preamble unit.
12, device according to claim 11 is characterized in that, described pretreatment unit comprises: switch unit and pre-mixing processing unit;
Switch unit is used to switch the multichannel baseband signal to pre-mixing processing unit, or wherein one road signal that switches in the multichannel baseband signal arrives pre-mixing processing unit;
When described pre-mixing processing unit receives the multichannel baseband signal, then transmit the multichannel baseband signal that receives and give the detection of preamble unit; When described pre-mixing processing unit receives a roadbed band signal, then this roadbed band signal is carried out pre-mixing and handle, and the pre-mixing signal of output multichannel is given the detection of preamble unit.
13, device according to claim 12 is characterized in that, also comprises:
Demodulation coding is decision unit as a result, is used to judge whether the CRC check sign indicating number of demodulation coding unit output is correct, when affirmation is correct, then exports described correct CRC check sign indicating number, and the decode results of the signal of the corresponding branch road of described check code; Otherwise, the indication information of output decoding error.
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