CN102098083A - Reconstruction method and device of enhanced dedicated channel - Google Patents
Reconstruction method and device of enhanced dedicated channel Download PDFInfo
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- CN102098083A CN102098083A CN2010106136933A CN201010613693A CN102098083A CN 102098083 A CN102098083 A CN 102098083A CN 2010106136933 A CN2010106136933 A CN 2010106136933A CN 201010613693 A CN201010613693 A CN 201010613693A CN 102098083 A CN102098083 A CN 102098083A
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Abstract
The invention provides a reconstruction method and device of an enhanced dedicated channel, belonging to the technical field of communications. The device disclosed by the embodiment of the invention comprises an acquiring module, a demodulating module, an obtaining module and a reconstructing module. The method comprises the following steps of obtaining antenna data; demodulating the antenna data to obtain the enhanced dedicated channel data of an offset user; obtaining a likelihood ratio of the enhanced dedicated channel data of the offset user and performing hyperbolic tangent judgment to obtain a judgment result; and reconstructing the antenna data of the offset user according to the judgment result to obtain the reconstruction data of the offset user. The embodiment of the invention can be used for reconstructing by obtaining the likelihood ratio and performing the hyperbolic tangent judgment, so that the reconstruction efficiency is improved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of enhancing dedicated channel reconstructing method and device.
Background technology
Along with the high speed development of mobile communication, the frequency spectrum resource growing tension.For improving the availability of frequency spectrum, people propose various advanced technologies to improve the system spectrum utilance, wherein Multiuser Detection is subjected to extensive concern, MUD (Multi-user Detection, multiuser detection) passes through in these interference of receiving terminal reconstruct, carry out IC (Interference Cancellation, interference cancellation) by the interference of reconstruct then, to improve performance.
Different users distinguishes with different sign indicating numbers in the WCDMA system, because the nonorthogonality of sign indicating number, so receiving terminal can not be eliminated other users' interference fully; And user MAI (Multiple Access Interference, multiple access disturbs) more at most is big more, so the WCDMA system is the self-interference system.Therefore the channel data (for example E-DPDCH channel of highspeed user's use) of certain customers can be eliminated in the prior art by interference cancellation, the benefited purpose of decoding that makes other user can be reached.Wherein, E-DPDCH (E-DCH Dedicated Physical Data Control Channel, the special physical data control channel of enhancing dedicated channel) is a kind of new physical layer channel of E-DCH (Enhanced Dedicated Channel strengthens dedicated channel).
It in the prior art scheme that adopts the decoding back to rebuild E-DCH, be specially: for the E-DPDCH channel employing decoding back reconstruct that participates in offseting the user, promptly consider to participate in reconstruct after the information Gray code of correct TTI (Transmission Time Interval, Transmission Time Interval) is used in the decoding back.That is: obtain from real-time antenna and offset user's data, the row decoding of going forward side by side.If decode results is correct, then other users can offset this data of usefulness from oneself eliminating from the data that antenna receives.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
The method of decoding back reconstruct of the prior art adopts the mode of serial, needs to collect earlier 1 TTI that is used to together decipher.Existing TTI generally needs 3 time slots (slot), adds the time delay (2slot) and the decoding delay (about 1.5slot) of channel estimating, needs about 6.5slot altogether, and time delay is bigger.If will satisfy the time-delay demand, then the scheme of decoding back reconstruct can't the complete TTI of reconstruct, can not make a plurality of users of WCDMA system realize being benefited simultaneously and effectively.
Summary of the invention
In order to improve the efficient of interference cancellation, the embodiment of the invention provides a kind of reconstructing method and device that strengthens dedicated channel E-DCH.Described technical scheme is as follows:
The embodiment of the invention has proposed a kind of reconstructing method that strengthens dedicated channel, comprising:
Obtain antenna data;
Described antenna data is carried out demodulation, obtain offseting user's enhancing dedicated channel data;
The described user's of offseting enhancing dedicated channel data is asked for log-likelihood ratio and carry out the tanh judgement, obtain court verdict;
Utilize described court verdict that the described user's of offseting antenna data is reconstructed, obtain offseting user's reconstruct data.
The embodiment of the invention has also proposed a kind of reconfiguration device that strengthens dedicated channel, comprising:
Acquisition module is used to obtain antenna data;
Demodulation module is used for described antenna data is carried out demodulation, obtains offseting user's enhancing dedicated channel data;
Ask for module, be used for the described user's of offseting enhancing dedicated channel data being asked for log-likelihood ratio and carrying out the tanh judgement, obtain court verdict;
Reconstructed module is used to utilize described court verdict that the described user's of offseting antenna data is reconstructed, and obtains offseting user's reconstruct data.
The beneficial effect of the technical scheme that the embodiment of the invention provides is: the embodiment of the invention can be reconstructed by the mode of asking for log-likelihood ratio and carrying out tanh judgement, to improve the efficient of reconstruct.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, to do one to the accompanying drawing that uses among the embodiment below introduces simply, apparently, below listed accompanying drawing only be some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of first embodiment of the invention;
Fig. 2 is the schematic flow sheet of reconstruct after a kind of demodulation of the present invention;
Fig. 3 is the schematic diagram of the instantiation that offsets after demodulation of the present invention;
Fig. 4 is the structural representation of third embodiment of the invention;
Fig. 5 is the structural representation of fourth embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
First embodiment of the invention has proposed a kind of reconstructing method that strengthens dedicated channel, and its flow process comprises as shown in Figure 1:
The embodiment of the invention can be reconstructed by the mode of asking for log-likelihood ratio and carrying out tanh judgement, to improve the efficient of reconstruct.
Second embodiment of the invention has proposed a kind of reconstructing method that strengthens dedicated channel, is to improve on the basis of first embodiment, comprising:
Step 201, obtain antenna data.
Be specially, on antenna, have a plurality of data.Then in one embodiment of the invention, can obtain at least two real-time antenna data that offset the user on the real-time antenna, and to described each offset that user's data is parallel carries out reconstruct after the demodulation, offset data to obtain.
Wherein, parallelly carry out after the demodulation reconstruct and be meant simultaneously a plurality of real-time antenna data are carried out reconstruct after the demodulation.
Step 202, described antenna data is carried out demodulation, obtain offseting user's enhancing dedicated channel data;
Step 203, the described user's of offseting enhancing dedicated channel data asked for carry out tanh (tanh) judgement behind the log-likelihood ratio (LLR);
Step 204, utilize described court verdict that the described user's of offseting antenna data is reconstructed, obtain offseting user's reconstruct data.
Wherein, the mode that is reconstructed in the step 204 can be specially as shown in Figure 2:
2041, with the described court verdict load channel fading factor and the skew factor, obtain loading result;
2042, utilize channel code and scrambler that described loading result is carried out spectrum-spreading and scrambling, obtain the scrambling result;
2043, to described scrambling result according to each line data stream sequential adjustment of going forward side by side that directly adds up, obtain adjusting the result;
2044, described adjustment result is carried out filtering, to obtain the described user's of offseting reconstruct data.
Further, also can enjoy gain after offseting in order to make the user who participates in offseting, described method can also comprise:
Step 205, with the antenna data after described the offseting of reconstruct data add-back of the described user's of offseting whole code channels or part code channel, obtain data to be demodulated;
Step 206, described data to be demodulated are carried out demodulation, obtain offseting user's demodulation result.
The embodiment of the invention can be by parallel processing mode the real-time antenna data that offset the user are carried out reconstruct after the demodulation, and can make the user who participates in offseting also obtain gain.
The present invention will be further described with a concrete example below:
With as shown in Figure 3, the real-time antenna 1 among the figure receives five users' real-time antenna data: D1, D2, D3, D4, D5; Wherein first user, second user, the 3rd user's real-time antenna data D1, D2, D3 participate in offseting, and four-function family, the 5th user's real-time antenna data D4, D5 do not participate in offseting.
As shown in Figure 3, time-delay antenna 2 is at the T that delayed time
aThe back obtains these five users' time-delay antenna data D1 ', D2 ', D3 ', D4 ', D5 '.For the user's data that does not participate in offseting, directly obtain from the time-delay antenna.In embodiments of the present invention, after receiving the real-time antenna data, promptly carry out reconstruct after the demodulation.Reconstruct offset user's data after, the non-user of offseting is eliminated these data from time-delay data D4 ' of antenna or D5 '.Concrete can for:
Step 301, after receiving user's real-time antenna data on the real-time antenna, the user's that each participation is offseted real-time antenna data D1, D2, D3 be parallel to carry out reconstruct after the demodulation, to obtain the user's data that a plurality of participations offset;
Step 302, will receive the real-time antenna data D1, D2, the D3 that participate in the user offset and carry out demodulation obtaining this user's E-DCH channel data, and carry out tanh (tanh) judgement after this E-DCH channel data asked for log-likelihood ratio (LLR);
Step 303, the court verdict load channel estimated the fading factor and the skew factor of output;
Step 304, obtain channel code and scrambler, to carry out spectrum-spreading and scrambling;
Step 305, to each directly add up and to the sequential of data flow adjust the back filtering;
Step 306, the real-time antenna data of each user antenna are added up, to reconstruct data;
Step 307, obtain non-the offset user of time-delay on the antenna time-delay antenna data D4 ', D5 ', and eliminate data after the reconstruct of user D1, D2 that this participation offsets, D3 among will delay time antenna data D4 ', the D5 ', and after carrying out demodulation reconstruct to obtain the non-user's data that offsets.
Step 308, the data that offset that will offset user's all or part of code channel are added back to demodulation again after the data after offseting, and output offsets user's demodulation result.
Equally with as shown in Figure 1 be example, demodulation second user or the 3rd user again after offseting aft antenna data add-back first user's data, then second user or the 3rd user can enjoy the gain that eliminates first user.Again for example: demodulation first user again behind a part of code channel that offsets aft antenna data add-back second user then can obtain to eliminate other code channel gain of second user during code channel of demodulation add-back.
Third embodiment of the invention has proposed a kind of reconfiguration device that strengthens dedicated channel, and its flowage structure comprises as shown in Figure 4:
Ask for module 3, be used for the described user's of offseting enhancing dedicated channel data being asked for log-likelihood ratio and carrying out the tanh judgement, obtain court verdict;
The embodiment of the invention can be reconstructed by the mode of asking for log-likelihood ratio and carrying out tanh judgement, to improve the efficient of reconstruct.
Fourth embodiment of the invention has proposed a kind of reconfiguration device that strengthens dedicated channel, is to improve on the basis of the 3rd embodiment, and its structure comprises as shown in Figure 5:
Ask for module 3, be used for the described user's of offseting enhancing dedicated channel data being asked for log-likelihood ratio and carrying out the tanh judgement, obtain court verdict.
Wherein, the described number of users that offsets is a plurality of; Described reconstructed module also is used to utilize described court verdict that described a plurality of users' of offseting antenna data is carried out parallel reconstruction.
Wherein, reconstructed module 4 can be specially:
Adding device 41 is used for the described court verdict load channel fading factor and the skew factor are obtained loading result;
Scrambling unit 42 is used to utilize channel code and scrambler that described loading result is carried out spectrum-spreading and scrambling, obtains the scrambling result;
Adjustment unit 43 is used for described scrambling result obtaining adjusting the result according to each line data stream sequential adjustment of going forward side by side that directly adds up;
Filter unit 44 is used for described adjustment result is carried out filtering, to obtain the described user's of offseting reconstruct data.
Add module 5, be used for the antenna data after described the offseting of reconstruct data add-back of the described user's of offseting whole code channels or part code channel is obtained data to be demodulated;
The embodiment of the invention can be by parallel processing mode the real-time antenna data that offset the user are carried out reconstruct after the demodulation, and can make the user who participates in offseting also obtain gain.
Need to prove: above-mentioned the 3rd, the 4th embodiment only is illustrated with the division of above-mentioned each functional module, in the practical application, can as required the above-mentioned functions distribution be finished by different functional modules, the internal structure that is about to device is divided into different functional modules, to finish all or part of function described above.The method that above-mentioned the 3rd, the 4th embodiment and first, second embodiment propose belongs to same design; Therefore same section repeats no more.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program order, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a reconstructing method that strengthens dedicated channel data is characterized in that, comprising:
Obtain antenna data;
Described antenna data is carried out demodulation, obtain offseting user's enhancing dedicated channel data;
The described user's of offseting enhancing dedicated channel data is asked for log-likelihood ratio and carry out the tanh judgement, obtain court verdict;
Utilize described court verdict that the described user's of offseting antenna data is reconstructed, obtain offseting user's reconstruct data.
2. method according to claim 1 is characterized in that, also comprises:
From described antenna data, eliminate the described user's of offseting reconstruct data, the antenna data after obtaining offseting.
3. method according to claim 2 is characterized in that, also comprises:
From the antenna data after described the offseting, demodulate the non-user's of offseting enhancing dedicated channel data.
4. method according to claim 3 is characterized in that, also comprises:
Antenna data with after described the offseting of reconstruct data add-back of the described user's of offseting whole code channels or part code channel obtains data to be demodulated;
Described data to be demodulated are carried out demodulation, obtain offseting user's demodulation result.
5. according to each described method in the claim 1 to 4, it is characterized in that, describedly utilize described court verdict that the described user's of offseting antenna data is reconstructed, the reconstruct data that obtains offseting the user comprises:
With the described court verdict load channel fading factor and the skew factor, obtain loading result;
Utilize channel code and scrambler that described loading result is carried out spectrum-spreading and scrambling, obtain the scrambling result;
Described scrambling result according to each line data stream sequential adjustment of going forward side by side that directly adds up, is obtained adjusting the result;
Described adjustment result is carried out filtering, to obtain the described user's of offseting reconstruct data.
6. according to each described method in the claim 1 to 4, it is characterized in that the described number of users that offsets is a plurality of;
Described utilize described court verdict to the described user's of offseting antenna data be reconstructed for: utilize described court verdict that described a plurality of users' of offseting antenna data is carried out parallel reconstruction.
7. a reconfiguration device that strengthens dedicated channel data is characterized in that, comprising:
Acquisition module is used to obtain antenna data;
Demodulation module is used for described antenna data is carried out demodulation, obtains offseting user's enhancing dedicated channel data;
Ask for module, be used for the described user's of offseting enhancing dedicated channel data being asked for log-likelihood ratio and carrying out the tanh judgement, obtain court verdict;
Reconstructed module is used to utilize described court verdict that the described user's of offseting antenna data is reconstructed, and obtains offseting user's reconstruct data.
8. device according to claim 7 is characterized in that, also comprises:
Add module, be used for the antenna data after described the offseting of reconstruct data add-back of the described user's of offseting whole code channels or part code channel is obtained data to be demodulated;
The secondary demodulation module is used for described data to be demodulated are carried out demodulation, obtains offseting user's demodulation result.
9. according to claim 7 or 8 described devices, it is characterized in that described reconstructed module comprises:
Adding device is used for the described court verdict load channel fading factor and the skew factor are obtained loading result;
Scrambling unit is used to utilize channel code and scrambler that described loading result is carried out spectrum-spreading and scrambling, obtains the scrambling result;
Adjustment unit is used for described scrambling result obtaining adjusting the result according to each line data stream sequential adjustment of going forward side by side that directly adds up;
Filter unit is used for described adjustment result is carried out filtering, to obtain the described user's of offseting reconstruct data.
10. according to claim 7 or 8 described devices, it is characterized in that the described number of users that offsets is a plurality of; Described reconstructed module also is used to utilize described court verdict that described a plurality of users' of offseting antenna data is carried out parallel reconstruction.
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