CN102111784A - VAMOS joint detection method and device - Google Patents
VAMOS joint detection method and device Download PDFInfo
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- CN102111784A CN102111784A CN2009102390650A CN200910239065A CN102111784A CN 102111784 A CN102111784 A CN 102111784A CN 2009102390650 A CN2009102390650 A CN 2009102390650A CN 200910239065 A CN200910239065 A CN 200910239065A CN 102111784 A CN102111784 A CN 102111784A
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Abstract
The present invention discloses a VAMOS (Voice services overAdaptive Multi-user Channels on One Slot) joint detection method, the method comprises an uplink demodulation process on signals of two users who share the same time slot, wherein the process comprises the following steps of: calculating a signal power difference between the signals of the two users; comparing the signal power difference with a preset first threshold; and performing the corresponding demodulation process according to the comparison result. In addition, the present invention also discloses a VAMOS joint detection device. The method in the present invention sets a signal power difference threshold, and then compares the power difference with the threshold, thereby distinguishing approaching degree of the two user signals more effectively and accurately, and the corresponding demodulation is performed based on the approaching degree, so as to reduce errors.
Description
Technical field
The present invention relates to signal processing technology, be specifically related to a kind of VAMOS (Voice services overAdaptive Multi-user Channels on One Slot, the speech business of single time slot adaptive multiuser) associated detecting method and device.
Background technology
Along with increasing rapidly of mobile phone user, hastening towards saturation capacity day of the gsm communication system of employing conventional art, adopt two shared same time slot method of user can under the situation that does not increase the extra spectrum bandwidth, significantly improve the capacity of system, thereby effectively save the investment of operator.
VAMOS is a kind of technology that can carry two or more users on a time slot of present gsm system.Descending employing α-QPSK (Quadrature Phase Shift Keying, quarternary phase-shift keying (QPSK)) modulation technique and new TSC (Training Sequence Code, training sequence code) guarantee on the same time slot two users respectively demodulation preferably come out, the up then method by joint-detection demodulates two users on the same time slot.At present for the up method of reseptance of VAMOS, mainly contain JDMLSE (Joint Detection Maximum Likelihood Sequence Estimation: joint-detection-maximum-likelihood sequence estimation), JDRSSE (Joint Detection Reduced StateSequence Estimation: joint-detection-reduced state sequencal estimation), SIC-STIRC several schemes such as (SuccessiveInterference Cancellation-Spatio-Temporal Interference Rejection Combining: disturb during counteracting serial interference-sky and suppress to merge).SIC-STIRC conduct a kind of joint-detection scheme wherein, its main thought are to adopt SIC in conjunction with STIRC, demodulate two users' signal successively according to the power of subscriber signal.It at first adopts the central stronger user of energy of two users of STIRC technology demodulation, the signal that deducts strong user then from total received signal obtains weak user's signal, adopt STIRC to carry out demodulation to weak user again, eliminated the interference of strong user effectively, improved weak user's performance weak user.But there is the less-than-ideal situation of performance in this scheme when two user power are close.By analyze finding, when two user's received powers near the time, the strong relatively user of weak user is exactly that a very big common road disturbs, this moment, strong user's demodulation performance will be poor, the error rate is higher relatively.Also have another situation simultaneously, when two user power are close, judge which user is that strong user also can exist certain erroneous judgement among two users, if at this moment more weak user's differentiation is strong user, then the performance of demodulation can be poorer.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of and can effectively distinguish subscriber signal strong and weak also the VAMOS associated detecting method and the device of corresponding demodulation.
For solving the problems of the technologies described above, the invention provides a kind of VAMOS associated detecting method, comprise that this process comprises to the uplink demodulation process from two users' of shared same time slot signal:
The signal power of calculating described two users is poor;
Described signal power difference and presetting first threshold are compared;
Carry out corresponding demodulating process according to comparative result.
Wherein saidly carry out corresponding demodulating process according to comparative result and comprise: if described signal power difference greater than described first threshold, is then carried out demodulation by serial interference elimination; And/or if described signal power difference smaller or equal to described first threshold, then eliminate and carry out demodulation by parallel interference.
Wherein saidly carry out demodulation by serial interference elimination and comprise: first user's that signal power is strong among described two users of demodulation signal; The described first subscriber signal part of regenerative reception end; From two users' received signal, deduct first user's of regeneration signal, obtain the signal of second user a little less than the signal power among described two users; Signal to described second user carries out demodulation.
The wherein said elimination by parallel interference carried out demodulation and comprised: the common road of eliminating described two users' signal respectively disturbs; The signal of eliminating two users after disturbing is carried out equalizing demodulation; Declare data firmly with what equalizing demodulation obtained, do its regenerated signal separately of convolution reconstruct with described two users channel impulse response separately, from two users' received signal, deduct one of them user's regenerated signal respectively, obtain two users signal separately.The parallel interference cancellation module is used to eliminate two interference between the user, and it is that all users are done Interference Cancellation simultaneously.Utilize the front to declare data firmly to what two users did simultaneously respectively that equilibrium obtains, do their signals separately of convolution reconstruct with channel impulse response separately, from two users' received signal, deduct one of them user's signal then respectively, obtain two users more approaching real signal separately.
Described two users' of wherein said calculating signal power difference comprises: according to described two users' channel impulse response, obtain the received power of described two user's correspondences respectively; The signal power that thoroughly deserves described two users of calculating described two user's received power differences is poor.
For solving the problems of the technologies described above, the present invention also provides a kind of VAMOS joint-detection device, is used for the signal from two users of shared same time slot is carried out uplink demodulation, comprises difference power module, comparison module and demodulation module,
It is poor that described difference power module is used to calculate described two users' signal power;
Described comparison module is used for described signal power difference and presetting first threshold are compared;
Described demodulation module is used for carrying out corresponding demodulating process according to the comparative result of described comparison module.
It is described signal power difference during greater than described first threshold that described demodulation module also is used for comparative result when described comparison module, carries out demodulation by serial interference elimination; And/or when the comparative result of described comparison module be described signal power difference during smaller or equal to described first threshold, eliminate by parallel interference and carry out demodulation.
Described demodulation module comprises the serial interference elimination unit, is used for when separating timing by serial interference elimination, first user's that signal power is strong among described two users of demodulation signal; The described first subscriber signal part of regenerative reception end; From two users' received signal, deduct first user's of regeneration signal, obtain the signal of second user a little less than the signal power among described two users; Signal to described second user carries out demodulation.
Described demodulation module comprises parallel interference cancellation unit, is used for separating timing when eliminating by parallel interference, and two users' signal is carried out demodulation; With demodulation obtain declare data firmly and described two users channel impulse response is separately done its regenerated signal separately of convolution reconstruct; From two users' received signal, deduct one of them user's regenerated signal respectively, obtain two users signal separately; Again two users signal is separately carried out demodulation.
Described difference power module comprises the combined channel estimation unit, is used to unite the channel impulse response of estimating two users, and described difference power module also is used for the channel impulse response according to described two users, obtains the received power of described two user's correspondences respectively; The signal power that thoroughly deserves described two users of calculating described two user's received power differences is poor.
The invention has the beneficial effects as follows:
(1) the present invention compares difference power and this threshold value by signalization difference power threshold value, thereby distinguishes the degree of closeness of two subscriber signals more effectively and accurately, and carries out corresponding demodulation in view of the above, has reduced error;
(2) the present invention judges the approaching subscriber signal of bit comparison by threshold value is set to the subscriber signal smaller or equal to this threshold value, no longer distinguishes the power of signal, adopts parallel interference to eliminate and carries out interference eliminated, has avoided performance loss; Subscriber signal greater than this threshold value then is judged as subscriber signal differs bigger, adopt the method for serial interference elimination to carry out interference eliminated.
Description of drawings
Fig. 1 illustrates the structural representation of an embodiment of apparatus of the present invention;
Fig. 2 illustrates the structural representation of another embodiment of apparatus of the present invention;
Fig. 3 illustrates the flow chart of an embodiment of the inventive method;
Fig. 4 illustrates the flow chart of another embodiment of the inventive method;
Fig. 5 illustrates the combined channel of another embodiment of the inventive method and estimates the simulation model schematic diagram;
Fig. 6 illustrates the flow chart that the parallel interference of another embodiment of the inventive method is eliminated.
Embodiment
In conjunction with the accompanying drawings the present invention is described in further detail below by embodiment.
A kind of embodiment of VAMOS joint-detection device of the present invention as shown in Figure 1, is used for the signal from two users of shared same time slot is carried out uplink demodulation, and it comprises difference power module, comparison module and demodulation module.It is poor that the difference power module is used to calculate described two users' signal power; Comparison module is used for described signal power difference and presetting first threshold are compared; Demodulation module is used for carrying out corresponding demodulating process according to the comparative result of described comparison module.
Since two user power near the time, can there be the big error rate in the strong user of demodulation, at this moment utilize strong user declare the strong user's of data reproduction signal firmly the time can occur than mistake, cause interference eliminated undesirable, the weak user's who obtains after strong user's interference eliminated signal even poorer during than interference eliminated not, at this moment the difference power according to two users is provided with decision threshold, i.e. a first threshold.
In one embodiment, this first threshold is set to 0～3dB.The user can choose suitable first threshold in the scope of 0～3dB.
In one embodiment, it is signal power difference during greater than first threshold that this demodulation module also is used for comparative result when comparison module, carries out demodulation by serial interference elimination; When the comparative result of described comparison module is a signal power difference during smaller or equal to first threshold, eliminate by parallel interference and carry out demodulation.If the signal power difference in this first threshold, just can think that these two users' power difference is less relatively, directly two users are adopted PIC (Parallel Interference Canceling: parallel interference is eliminated) respectively; When two user power differences exceed this first threshold, just think that these two user power differ bigger, are more suitable for adopting method for eliminating serial interference to eliminate interference.
Another embodiment according to apparatus of the present invention, as shown in Figure 2, demodulation module comprises the serial interference elimination unit, the signal that is used for the first strong user of described two the user's signal powers of demodulation, obtain first user and declare data firmly in Burst cycle, utilize first user's channel estimating and first user's the first subscriber signal part of declaring the data reproduction receiving terminal firmly then, from two users' received signal, deduct first user's of regeneration signal again, obtain the signal of second user a little less than the signal power among two users, to this second user demodulation.
In one embodiment, as shown in Figure 2, demodulation module comprises parallel interference cancellation unit, this parallel interference cancellation unit.This parallel interference cancellation unit is used to eliminate two interference between the user, and it is that all users are done Interference Cancellation simultaneously.Utilize the front to declare data firmly to what two users did simultaneously respectively that equilibrium obtains, do their signals separately of convolution reconstruct with channel impulse response separately, from two users' received signal, deduct one of them user's signal then respectively, obtain two users more approaching real signal separately.
In one embodiment, demodulation module comprises that also interference suppresses unit and balanced unit.Disturb and suppress the common road interference that the unit is eliminated two users' signal respectively; In a kind of concrete execution mode, disturb the inhibition unit to be used for respectively two users' signal being eliminated common road by time domain albefaction and spatial domain albefaction and disturb; Balanced unit, be used for MLSE (Maximum Likelihood SequenceEstimation, maximum-likelihood sequence estimation) equilibrium, promptly the signal through disturbing the inhibition unit to eliminate after disturbing is carried out equalizing demodulation, export each user's decoding information, for the back decoder for decoding, recover the information that sends.In one embodiment, the road disturbs carrying out using interference inhibition unit to eliminate altogether before serial interference or parallel interference are eliminated, and carries out the MLSE demodulation by balanced unit again.
In one embodiment, the difference power module comprises the combined channel estimation unit as shown in Figure 2, be used to unite the channel impulse response of estimating two users, this difference power module also is used for the channel impulse response according to described two users, obtains the received power of two user's correspondences respectively; The signal power that thoroughly deserves described two users of calculating described two user's received power differences is poor.Two users' that obtain according to the combined channel estimation unit channel impulse response calculates the difference power that thoroughly deserves these two users (dB value or linear value) of two user power differences then.Two user power differences of calculating herein also can realize by alternate manner.
With respect to present SIC-STIRC technology, present embodiment has improved weak user's performance significantly when two user power are close, by choose suitable first threshold in 0～3dB, can obtain the gain of about 0～2dB.
A kind of embodiment of VAMOS associated detecting method of the present invention comprises that this process as shown in Figure 3, comprising to the uplink demodulation process from two users' of shared same time slot signal:
Step 302: the signal power of calculating described two users is poor;
Step 304: described signal power difference and presetting first threshold are compared;
Step 306: carry out corresponding demodulating process according to comparative result.
In one embodiment, step 306 comprises: whether judge the signal power difference greater than first threshold, if the signal power difference greater than first threshold, is then carried out demodulation by serial interference elimination; If the signal power difference smaller or equal to described first threshold, is then eliminated by parallel interference and is carried out demodulation.Wherein carrying out demodulation by serial interference elimination comprises: first user's that signal power is strong among described two users of demodulation signal; The described first subscriber signal part of regenerative reception end; From two users' received signal, deduct first user's of regeneration signal, obtain the signal of second user a little less than the signal power among described two users; To second user's demodulation.Carry out demodulation and comprise and wherein eliminate: respectively two users' signal is carried out time domain albefaction and spatial domain albefaction and eliminate common road and disturb by parallel interference; The signal of eliminating two users after disturbing is carried out equalizing demodulation; Declare data firmly with what equalizing demodulation obtained, do its regenerated signal separately of convolution reconstruct with described two users channel impulse response separately, from two users' received signal, deduct one of them user's regenerated signal respectively, obtain two users signal separately.
In one embodiment, step 302 comprises: according to two users' channel impulse response, obtain the received power of two user's correspondences respectively; The signal power that thoroughly deserves described two users of calculating described two user's received power differences is poor.
Fig. 4 illustrates the flow chart according to another embodiment of the inventive method, and it comprises:
Step 402: received signal;
Step 404: according to the training sequence TSC and the new TSC of received signal Received Signal and two user's correspondences, obtain first user's channel impulse response Ch_Est_0 and second user's channel impulse response Ch_Est_1 by combination channel estimating method, as shown in Figure 5.The combined channel estimation approach is as follows:
Baseband signal can be expressed as:
Wherein, L is a channel dispersion length.
Training sequence part received signal: Y=M
(0)H
(0)+ M
(1)H
(1)+ n (2)
＝[M
(0)，M
(1)][H
(0)，H
(1)]
T+n
＝MH+n
Wherein, M
(0)And M
(1)Be first user (user 0) and second user's (user 1) training sequence matrix, n is a noise matrix.
Use least square method:
[[H
(0)]
T，[H
(1)]
T]＝[[M
(0)，M
(1)]
H[M
(0)，M
(1)]]
-1[M
(0)，M
(1)]
HY (4)
Wherein, H
(0)Be first user's who obtains channel impulse response Ch_Est_0, H
(1)Be second user's who obtains channel impulse response Ch_Est_1.
Step 406: the difference size of calculating first user and second user's channel impulse response ENERGY E s_0 and Es_1.Obtain according to Ch_Est_0 and Ch_Est_1 each user's correspondence two users received power and be converted to corresponding dB value Es_0 (dB) and Es_1 (dB), then | Es_0-Es_1| is exactly the difference power of their correspondences.Two users' of aforementioned calculation difference power process also can realize by alternate manner.Judge two user power extents.When difference between them | when Es_0-Es_1| is less than or equal to the first threshold Threshold of setting, change step 408; Otherwise change step 412;
Step 408: with regard to directly adopt Received Signal to two users use respectively carry out behind the STIRC equalizing demodulation obtain they separately declare data Hard_0 (t) and Hard_1 (t) firmly;
Step 409: adopt the method for PIC to handle received signal Received Signal and demodulation, as shown in Figure 6.Declare data Hard_0 (t) and Hard_1 (t) firmly by what step 408 obtained two users, do convolution with their channel impulse response Ch_Est_0 and Ch_Est_0 separately respectively then, first user's of regenerative reception end signal Recovered_0 (t) and second user's signal Recovered_1 (t), from two users' received signal Received Signal, deduct the signal Received_1 (t) that Recovered_0 (t) obtains second user, from two users' received signal Received Signal, deduct the signal Received_0 (t) that Recovered_1 (t) obtains first user, respectively Received_0 (t) and Received_1 (t) are done STIRC and MLSE equilibrium, obtaining separately soft-decision output information Soft_0 (t) and Soft_1 (t);
Step 410: soft information Soft_0 (t) and Soft_1 (t) to two users decipher, and obtain original transmitted information, finish.
Step 412: enter the counteracting serial interference pattern, judge the ENERGY E s_0 and the Es_1 size of first user and second user's channel impulse response, if Es_0＞Es_1 changes step 414; Otherwise change step 422;
Step 414: first first user's of demodulation signal, and obtain hard demodulating data Hard_0 (t) and the soft demodulating information Soft_0 (t) of first user in this Burst cycle, use Hard_0 (t) to do convolution, first user's of regenerative reception end signal Recovered_0 (t) then with its channel impulse response Ch_Est_0;
Step 416: from two users' received signal R (t), reduce first subscriber signal that regeneration obtains, promptly obtain second user's of receiving terminal signal Received_1 (t),
Step 418: second subscriber signal is carried out the equalizing demodulation processing obtain Hard_1 (t) and Soft_1 (t);
Step 420: soft information Soft_0 (t) and Soft_1 (t) to two users decipher, and obtain original transmitted information, finish;
Step 422: second user's of first demodulation signal, obtain second user's hard demodulating data Hard_1 (t) and soft demodulating information Soft_1 (t), then utilize the received signal Recovered_1 (t) of Hard_1 (t) with second user of channel impulse response Ch_Est_1 convolution regeneration of second user
Step 426: it is carried out equalizing demodulation handle hard demodulating data Hard_0 (t) and the soft demodulating information Soft_0 (t) that obtains first user;
Above content be in conjunction with concrete execution mode to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. VAMOS associated detecting method comprises the uplink demodulation process from two users' of shared same time slot signal, it is characterized in that described process comprises:
The signal power of calculating described two users is poor;
Described signal power difference and presetting first threshold are compared;
Carry out corresponding demodulating process according to comparative result.
2. the method for claim 1 is characterized in that, wherein saidly carries out corresponding demodulating process according to comparative result and comprises:
If described signal power difference greater than described first threshold, is then carried out demodulation by serial interference elimination; And/or
If described signal power difference smaller or equal to described first threshold, is then eliminated by parallel interference and is carried out demodulation.
3. method as claimed in claim 2 is characterized in that, wherein saidly carries out demodulation by serial interference elimination and comprises:
First user's that signal power is strong among described two users of demodulation signal;
The described first subscriber signal part of regenerative reception end;
From two users' received signal, deduct first user's of regeneration signal, obtain the signal of second user a little less than the signal power among described two users;
Signal to described second user carries out demodulation.
4. method as claimed in claim 2 is characterized in that, the wherein said elimination by parallel interference carried out demodulation and comprised:
Signal to two users carries out demodulation;
With demodulation obtain declare data firmly and described two users channel impulse response is separately done its regenerated signal separately of convolution reconstruct;
From two users' received signal, deduct one of them user's regenerated signal respectively, obtain two users signal separately;
Again two users signal is separately carried out demodulation.
5. as arbitrary described method in the claim 1 to 4, it is characterized in that two users' of wherein said calculating signal power difference comprises:
According to described two users' channel impulse response, obtain the received power of described two user's correspondences respectively;
The signal power that thoroughly deserves described two users of calculating described two user's received power differences is poor.
6. VAMOS joint-detection device is used for the signal from two users of shared same time slot is carried out uplink demodulation, it is characterized in that, comprises difference power module, comparison module and demodulation module,
It is poor that described difference power module is used to calculate described two users' signal power;
Described comparison module is used for described signal power difference and presetting first threshold are compared;
Described demodulation module is used for carrying out corresponding demodulating process according to the comparative result of described comparison module.
7. device as claimed in claim 6 is characterized in that, it is described signal power difference during greater than described first threshold that described demodulation module also is used for comparative result when described comparison module, carries out demodulation by serial interference elimination; And/or when the comparative result of described comparison module be described signal power difference during smaller or equal to described first threshold, eliminate by parallel interference and carry out demodulation.
8. device as claimed in claim 7 is characterized in that described demodulation module comprises the serial interference elimination unit, is used for when separating timing by serial interference elimination, first user's that signal power is strong among described two users of demodulation signal; The described first subscriber signal part of regenerative reception end; From two users' received signal, deduct first user's of regeneration signal, obtain the signal of second user a little less than the signal power among described two users; Described second subscriber signal is carried out demodulation.
9. device as claimed in claim 7 is characterized in that described demodulation module comprises parallel interference cancellation unit, is used for separating timing when eliminating by parallel interference, and two users' signal is carried out demodulation; With demodulation obtain declare data firmly and described two users channel impulse response is separately done its regenerated signal separately of convolution reconstruct; From two users' received signal, deduct one of them user's regenerated signal respectively, obtain two users signal separately; Again two users signal is separately carried out demodulation.
10. as the arbitrary described device of claim 6 to 9, it is characterized in that, described difference power module comprises the combined channel estimation unit, be used to unite the channel impulse response of estimating two users, described difference power module also is used for the channel impulse response according to described two users, obtains the received power of described two user's correspondences respectively; The signal power that thoroughly deserves described two users of calculating described two user's received power differences is poor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013026317A1 (en) * | 2011-08-24 | 2013-02-28 | 中兴通讯股份有限公司 | Method and system for obtaining voice services over adaptive multi-user channels on one slot (vamos) information by base station subsystem |
| CN104025672A (en) * | 2012-12-31 | 2014-09-03 | 英特尔移动通信有限责任公司 | Device, method, mobile station, and digital storage medium |
| CN106788895A (en) * | 2016-12-22 | 2017-05-31 | 北京松果电子有限公司 | Interpretation method and device |
-
2009
- 2009-12-28 CN CN2009102390650A patent/CN102111784A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013026317A1 (en) * | 2011-08-24 | 2013-02-28 | 中兴通讯股份有限公司 | Method and system for obtaining voice services over adaptive multi-user channels on one slot (vamos) information by base station subsystem |
| CN104025672A (en) * | 2012-12-31 | 2014-09-03 | 英特尔移动通信有限责任公司 | Device, method, mobile station, and digital storage medium |
| CN104025672B (en) * | 2012-12-31 | 2018-12-25 | 英特尔德国有限责任公司 | Device, method, mobile station and digital storage media |
| CN106788895A (en) * | 2016-12-22 | 2017-05-31 | 北京松果电子有限公司 | Interpretation method and device |
| CN106788895B (en) * | 2016-12-22 | 2019-12-03 | 北京松果电子有限公司 | Interpretation method and device |
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Application publication date: 20110629 |