CN100473205C - A Relay Handover and Hard Handover Multi-level Adaptive Selection Method - Google Patents
A Relay Handover and Hard Handover Multi-level Adaptive Selection Method Download PDFInfo
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- CN100473205C CN100473205C CNB2005101351824A CN200510135182A CN100473205C CN 100473205 C CN100473205 C CN 100473205C CN B2005101351824 A CNB2005101351824 A CN B2005101351824A CN 200510135182 A CN200510135182 A CN 200510135182A CN 100473205 C CN100473205 C CN 100473205C
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- 238000010187 selection method Methods 0.000 title abstract description 5
- 230000003044 adaptive effect Effects 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000000052 comparative effect Effects 0.000 claims description 24
- 230000006978 adaptation Effects 0.000 claims description 18
- 238000012986 modification Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 9
- 238000004364 calculation method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005405 multipole Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
本发明设计一种时分同步码分多址(Time Division-SynchronousCode Division Multiple Access)系统中接力切换与硬切换的多级自适应选择方法。发生小区越区切换时，利用本发明的切换选择规则库来完成接力切换与硬切换，并根据切换成败调整切换选择规则。通过本发明的方法，建立起来符合具体实际无线环境特点相关切换选择规则库，加快切换方法选择响应速度，增加切换执行成功的概率。
The invention designs a multi-level self-adaptive selection method for relay switching and hard switching in a Time Division-Synchronous Code Division Multiple Access (Time Division-Synchronous Code Division Multiple Access) system. When cell handover occurs, the handover selection rule library of the invention is used to complete relay handover and hard handover, and the handover selection rule is adjusted according to the handover success or failure. By means of the method of the invention, a handover selection rule library in line with specific actual wireless environment characteristics is established, which speeds up the response speed of handover method selection and increases the probability of successful handover execution.
Description
Technical field
The present invention relates to a kind of switching type system of selection of moving communicating field, particularly relate to a kind of at baton handover in the time division multiplex code division multiple access system in the 3G (Third Generation) Moblie and direct-cut operation multi-stage self-adaptive selecting method.
Background technology
Handoff procedure is the important part in the radio resource management function, two kinds of switching modes is arranged: baton handover and direct-cut operation in the TD-SCDMA system.Baton handover is one of core technology of TD-SCDMA mobile communication system, its thought has been utilized technology such as smart antenna and uplink synchronous exactly, on the basis that the distance and bearing to subscriber equipment (UE) positions, the switching target small area information that acquisition and UE close on, preparation is switched in the switch area that whether enters this Target cell according to UE.Be characterized in the communication terminal up Target cell that forwards to earlier, the descending Target cell that forwards in back.Direct-cut operation carries out under the situation of not knowing the accurate position of UE, need measure all neighbor cells, relatively carries out the selection of switch decision and Target cell according to given real-time measurement and thresholding then.Needing to be characterized in UE at first to delete original Radio Link, to start new Radio Link then and be linked into new Target cell.
Because the complexity and the particularity of wireless environment, two kinds of switching modes are not quite similar on handover success rate.Such as, for baton handover, it might not be the Node B that business service is provided for UE that the base station (Node B) than strong waveguide frequency signal is arranged.If the candidate cell scope is too small, the situation that the candidate cell pilot signal is lost takes place easily, cause system's cutting off rate to increase.If adopting Node B with strong waveguide frequency signal this moment is that the direct-cut operation of switch decision condition can guarantee to have higher handover success rate.And for direct-cut operation, when close frequencies was used in the adjacent sub-district of direct-cut operation, because co-channel interference, it is very fast that the received signal to noise ratio during conversation (Ec/Io) reduces, and that can carry out is Zone switched very little, very easily call drop.If adopt this moment multicarrier alien frequencies hard handover approach or single ripple baton handover mode can improve handover success rate.
Simultaneously, consider the different system design principle that the communication products of different communication production firm have two kinds of switching mode tenabilities, the system hardware product is also inequality for the support principle of two kinds of switching modes.These systematic design disciplines need be increased in the Rule of judgment of actual switching and selecting method, avoid having selected it because of system product and do not support that switching mode causes handoff failure.
The complexity of wireless environment and geographical feature has increased switching and selecting method and has judged difficulty, to such an extent as to be difficult to guarantee handover success rate, thus service quality (QoS) and customer satisfaction reduced.
Summary of the invention
The technical problem to be solved in the present invention provides high baton handover of a kind of handover success rate and direct-cut operation multi-stage self-adaptive selecting method.
Baton handover and direct-cut operation multi-stage self-adaptive selecting method may further comprise the steps:
When 1) the sub-district handover taking place,, obtain the Target cell of switching according to the cell switch determining condition, and comparison object sub-district and cell-of-origin characteristic point, the comparative feature result obtained;
2) in switching the selective rule storehouse, described comparative feature result is used the switching selective rule and draw the switching selection result;
3) export selected results.
Described switching selective rule storehouse is made up of first-order rule storehouse, secondary rule base, three grades of rule bases: described first-order rule storehouse is the set of switching law, comprising:
Can only select the rule of baton handover; And
Can only select the rule of direct-cut operation; And
Necessarily can not select the rule of baton handover; And
Necessarily can not select the rule of direct-cut operation.
Described secondary rule base is the set of switching law, comprising:
Can select baton handover, in the time of selecting direct-cut operation again, regulation is a kind of rule of preferable switching mode wherein.
Described three grades of rule bases are a rule:
Described rule is switched the selection judgment formula for the application self-adapting adjustment, judges which kind of success rate for switching is higher at present.
In the switching selective rule storehouse described comparative feature result being used the switching selective rule is specially:
(I) read described comparative feature result, judge whether system can discern described comparative feature, if can discern then enter step (II), if can not discern then enter step (IV);
(II) rule in described comparative feature result and the first-order rule storehouse is compared, if meet with rule in the first-order rule storehouse, the switching mode that described rule is corresponding is as selection result; If all inconsistent, enter step (III) with the strictly all rules in the first-order rule storehouse;
(III) rule in described comparative feature result and the secondary rule base is compared, select the rule that is consistent with described comparative feature result in the secondary rule base, and the switching mode that described rule is corresponding is as selection result.
(IV) switch the selection judgment formula according to the self adaptation adjustment, the success rate of more present baton handover mode and direct-cut operation, and the switching mode that present success rate is high is as selection result.
Described self adaptation adjustment is switched the selection judgment formula and is specially
The success rate of baton handover is P
1(1-P
2) W
The baton handover weights
The success rate of direct-cut operation is (1-P
1) P
2W
The direct-cut operation weights
Wherein, P
1It is baton handover success statistical probability; P
2It is direct-cut operation success statistical probability; W
The baton handover weightsBe to select baton handover weights, W
The direct-cut operation weightsBe to select the direct-cut operation weights.
The step of baton handover and the multipole adaptive selection method of direct-cut operation (IV) is specially:
With P
1(1-P
2) W
The baton handover weights(1-P
1) P
2W
The direct-cut operation weightsCompare, work as P
1(1-P
2) W
The baton handover weights〉=(1-P
1) P
2W
The direct-cut operation weightsThe time, select baton handover; Work as P
1(1-P
2) W
The baton handover weights＜(1-P
1) P
2W
The direct-cut operation weights, select direct-cut operation.
The multipole adaptive selection method of baton handover and direct-cut operation is further comprising the steps of:
1. whenever once switch, then switch and select judgment formula, the parameter of rule is made amendment according to described self adaptation adjustment.
1. described step is specially:
(A) judge whether switching is successful, if successfully enter step (B), if failure enters step (E)
(B) switch corresponding successful statistical probability value increase with described, and judge that whether the continuous number of success of described switching mode reaches the maximum number of success continuously of default, is then to enter step (C), otherwise enters step (D);
(C) weights of described switching mode are improved, the continuous number of success of described switching mode is made as 0, step finishes;
(D) the continuous number of success with described switching mode increases, and step finishes;
(E) the successful statistical probability with described switching mode correspondence reduces, and judges that whether the continuous frequency of failure of described switching mode reaches the maximum frequency of failure continuously of default, is then to enter step (F), otherwise enters step (G);
(F) weights of described switching mode are reduced, the continuous number of success of described switching mode is made as 0, step finishes;
(G) the continuous frequency of failure with described switching mode increases, and step finishes.
The multipole adaptive selection method of baton handover and direct-cut operation is further comprising the steps of:
According to described step 1. in the result of parameter modification, the respective rule of described secondary rule base and described three grades of rule bases is made amendment.
The present invention is when carrying out the selection of baton handover and direct-cut operation, make up three grades and switched the selective rule storehouse, but make it contain system design rule recognition feature rule and do not have that the feature selecting rule comprised all switch the switching of selecting spaces and select to judge, and count the handover success rate of respective rule, switch the selection judgment formula by the self adaptation adjustment and carry out relevant parameter calculating and adjustment, strengthened the adaptivity of switching selection algorithm, improved and switched the success rate of selecting.
Description of drawings
Fig. 1 is baton handover and direct-cut operation system of selection schematic diagram
Fig. 2 is three grades of rule base spatial division schematic diagrames
Fig. 3 switches to select successful switching law storehouse weights to adjust tactful schematic diagram
Fig. 4 switches to select failure switching law storehouse weights to adjust tactful schematic diagram
Fig. 5 is comparative feature point coding and baton handover and direct-cut operation parameter configuration schematic diagram
Embodiment
Describe in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
In the preferred embodiment of the present invention, at first set up form rule base as shown in Figure 5, described rule base comprises first-order rule storehouse, secondary rule base, three grades of rule bases.
The first-order rule storehouse has comprised the M bar and has switched selection principle as shown in Figure 2, and various rules of being made up of the system design characteristic point fully the O bar wherein comprise: but which recognition feature point must carry out baton handover or direct-cut operation; And but which recognition feature point necessarily can not carry out baton handover or direct-cut operation.As preferably, but the first-order rule storehouse can also comprise the part that belongs to the system design rule in the L bar secondary recognition feature rule base.The parameter of strictly all rules only participates in self adaptation adjustment switching and selects judgment formula calculating and adjustment in the first-order rule storehouse, but can not change the judged result of original selective rule, this parameter adjustment can be used as system upgrade support from now on and switches the important references principle of selecting design update, adjustment.
Characteristic point comprised whole 2 but mainly comprised in the secondary recognition feature rule base by N
NThe bar rule, the parameter that belongs to the L bar secondary rule in first-order rule storehouse in these rules participates in the self adaptation adjustment and switches calculating of selection judgment formula and adjustment, but can not change the judged result of original selective rule; All parameters that do not belong to the secondary rule in the first-order rule storehouse all participate in self adaptation adjustment switching selection judgment formula calculating and adjustment.Its switching selection result is switched the variation of selecting judgment formula result of calculation along with the self adaptation adjustment and is changed.
Comprised 1 rule in three grades of rule bases, the rule that described rule is switched at all comparative feature results that cause discerning because of unknown cause is switched according to the self adaptation adjustment and to be selected judgment formula to calculate and adjust switching law.Be different from the adjustment of secondary rule base self adaptation switch to select judgment formula to calculate and adjust be the parameter adjustment of rule in three grades of rule bases the time only consider the renewal of switching probability.
The selection judgment formula is switched in above-mentioned self adaptation adjustment:
Compare P
1(1-P
2) W
The baton handover weights(1-P
1) P
2W
The direct-cut operation weights, wherein, P
1It is baton handover success statistical probability; P
2It is direct-cut operation success statistical probability; W
The baton handover weightsBe to select baton handover weights, W
The direct-cut operation weightsBe to select the direct-cut operation weights, work as P
1(1-P
2) W
The baton handover weights〉=(1-P
1) P
2W
The direct-cut operation weights, select baton handover; Work as P
1(1-P
2) W
The baton handover weights＜(1-P
1) P
2W
The direct-cut operation weightsSelect direct-cut operation.
For first-order rule storehouse and secondary rule base, each parameter initial condition default value of above formula is taken as: W
The baton handover weights=0.6, W
The direct-cut operation weights=0.4, P
1=0.5, P
2=0.5, so relatively self adaptation adjustment switching is selected the result of calculation of judgment formula to embody the TD-SCMDA system recommendations basically and is in most cases adopted the baton handover mode.
For three grades of rule bases, owing to there is not certain principle can't obtain the feature comparative result of Target cell and cell-of-origin, therefore can only switch by a self adaptation adjustment selects judgment formula to come having or not feature switching is selected to judge export selected results.In order further to increase this blind power of hanking, the value main reference of its baton handover weights and direct-cut operation weights in the first order system design rule base number of various rules determine.Suppose that must adopt baton handover principle number is x
1, not adopting baton handover principle number is y
1, must adopt direct-cut operation principle number is x
2, not adopting direct-cut operation principle number is y
2, adopt baton handover to add up to x so
1+ y
2, adopt direct-cut operation to add up to x
2+ y
1, W
The baton handover weights=(x
1+ y
2)/M, W
The direct-cut operation weights=(x
2+ y
1)/M, P
1=0.5, P
2=0.5.
Preferred embodiment of the present invention flow process may further comprise the steps as shown in Figure 1:
1. when switch taking place, select after the Target cell by the switch decision condition, thereby enter baton handover and direct-cut operation system of selection inlet (step 101);
2. obtain Target cell and cell-of-origin comparative feature result (step 102);
3. judge whether the comparative feature result is to discern (step 103),, judge whether to comprise this correspondence comparative feature result's switching selection judgment rule (step 106) according to the first-order rule storehouse if the comparative feature result is discernible; If in the one-level storehouse, found corresponding switching selective rule, obtain corresponding switching selection result, and then mark switching selection type is 1, export selected results (step 108);
4. if do not comprise the judgment rule of this characteristic value in the one-level system design rule base, enter the secondary rule base; But directly read out switching selection result (step 107) according to the recognition feature coding in the secondary rule base, it is 2 that mark switches the selection type, export selected results (step 108);
5., enter three grades of rule bases if the comparative feature result can not discern (step 103).
Directly read no feature self adaptation from three grades of rule bases and switch selection storehouse switching selection result (step 104), the success rate of promptly more present baton handover mode and direct-cut operation, and the switching mode that present success rate is high is as selection result, it is 3 that mark switches the selection type, export selected results (step 108).
6. selection result is switched in output, adds up corresponding handover success rate, switches according to the self adaptation adjustment and selects judgment formula, carries out corresponding calculation of parameter and Policy Updates.
Rule of correspondence judged result is not revised in calculation of parameter, renewal for first order rule base; For calculation of parameter, the renewal of second level rule base, and judge whether to revise the weights and the judged result of the rule of correspondence; Only relate to the modification of the corresponding handover success rate of the rule of correspondence for the calculation of parameter of third level rule base, keep its relevant weights constant (step 109) that switch.
7. switching and selecting method finishes (step 110).
Fig. 5 has described comparative feature point and coding thereof between Target cell and the cell-of-origin, has described baton handover relevant with rule and direct-cut operation parameter configuration content simultaneously.
Three grades of rule base weights are adjusted strategy (step 108), as accompanying drawing 3 and accompanying drawing 4:
A. weights adjustment in first-order rule storehouse is carried out as secondary rule base account form, and the weights adjustment of its different is exactly all baton handovers and direct-cut operation can not change the selection result of respective rule;
B. secondary rule base weights are adjusted strategy from step 301, judge switching result through step 302, after carrying out whether success by step 303,304, and according to step 305,307,309,311,313,315,317,319 and step 306,308,310,312,314,316,318,320 carry out weights adjustment process under baton handover and the direct-cut operation success situation respectively; Step 401,403,405,407,409 and step 402,404,406,408,410 carry out weights adjustment process under baton handover and the direct-cut operation failure scenarios respectively, as follows:
1) step 401: when the baton handover of selecting is failed, P
1Reduce N
The relay number of times that runs succeeded continuously=0,
If N
The frequency of failure is carried out in relay continuously=N
The maximum frequency of failure of carrying out of relay,
Then, if W
The baton handover weights-Δ W
Adjust the factor0
Then, W
The baton handover weights=W
The baton handover weights-Δ W
Adjust the factor,
N
The frequency of failure is carried out in relay continuously=0;
Otherwise, N
The frequency of failure is carried out in relay continuously=N
The frequency of failure is carried out in relay continuously+ 1;
2) step 305: when the baton handover of selecting is successful, P
1Increase N
The frequency of failure is carried out in relay continuously=0,
If N
The relay number of times that runs succeeded continuously=N
The relay maximum number of times that runs succeeded,
Then, N
The relay number of times that runs succeeded continuously=0,
If W
The baton handover weights＜1-W
The direct-cut operation weightsThe time,
Then, W
The baton handover weights=W
The baton handover weights+ Δ W
Adjust the factor
Otherwise, if W
The direct-cut operation weights-Δ W
Adjust the factor0
Then, W
The baton handover weights=W
The baton handover weights+ Δ W
Adjust the factor,
W
The direct-cut operation weights=W
The direct-cut operation weights-Δ W
Adjust the factor
Otherwise, N
The relay number of times that runs succeeded continuously=N
The relay number of times that runs succeeded continuously+ 1;
3) step 402: when the direct-cut operation of selecting is failed, P
2Reduce N
Number of times firmly continuously runs succeeded=0,
If N
Direct-cut operation is carried out the frequency of failure continuously=N
The maximum frequency of failure of carrying out of direct-cut operation,
Then, if W
The direct-cut operation weights-Δ W
Adjust the factor0
Then, W
The direct-cut operation weights=W
The direct-cut operation weights-Δ W
Adjust the factor,
N
The hard frequency of failure of carrying out continuously=0;
Otherwise, N
Direct-cut operation is carried out the frequency of failure continuously=N
Direct-cut operation is carried out the frequency of failure continuously+ 1;
4) step 306: when the direct-cut operation of selecting is successful, P
2Increase N
The frequency of failure is carried out in relay continuously=0,
If N
The direct-cut operation number of times that runs succeeded continuously=N
The direct-cut operation maximum number of times that runs succeeded,
Then, N
Number of times firmly continuously runs succeeded=0,
If W
Direct-cut operation switches weights＜1-W
The baton handover weightsThe time,
Then, W
The direct-cut operation weights=W
Hard power is switched weights+ Δ W
Adjust the factor
Otherwise, if W
The baton handover weights-Δ W
Adjust the factor0
Then, W
The direct-cut operation weights=W
The direct-cut operation weights+ Δ W
Adjust the factor,
W
The baton handover weights=W
The baton handover weights-Δ W
Adjust the factor
Otherwise, N
The direct-cut operation number of times that runs succeeded continuously=N
The direct-cut operation number of times that runs succeeded continuously+ 1;
5) execution in step 321 finishes the weights adjustment process.
C. two of three grades of rule bases kinds of switching weights do not change, and it has reflected selects all to be faced with by W to having or not feature switching
The baton handover weights=(x
1+ y
2)/M and W
The direct-cut operation weights=(x
2+ y
1)/M fixedly weights switches selection calculating.Weights are big more have been reflected at it in that not have the confidence level that feature switches when selecting just big more.
Thought of the present invention can be adapted to all kinds of systems of selection of other mobile communication system, and in a word, the above only is preferred embodiment of the present invention, and non-limiting protection scope of the present invention.
Claims (7)
1, a kind of baton handover and direct-cut operation multi-stage self-adaptive selecting method is characterized in that, said method comprising the steps of:
When (1) the sub-district handover taking place,, obtain the Target cell of switching according to the cell switch determining condition,
And comparison object sub-district and cell-of-origin characteristic point, obtain the comparative feature result;
(2) in switching the selective rule storehouse, described comparative feature result used and switch selective rule and draw and cut
Change selection result;
(3) export selected results.
2, baton handover according to claim 1 and direct-cut operation multi-stage self-adaptive selecting method, it is characterized in that: described switching selective rule storehouse is made up of first-order rule storehouse, secondary rule base, three grades of rule bases: described first-order rule storehouse is the set of switching law, comprising:
Can only select the rule of baton handover; And
Can only select the rule of direct-cut operation; And
Necessarily can not select the rule of baton handover; And
Necessarily can not select the rule of direct-cut operation; Described secondary rule base is the set of switching law, comprising:
Can select baton handover, in the time of selecting direct-cut operation again, regulation is a kind of rule of preferable switching mode wherein; Described three grades of rule bases are a rule:
Described rule is switched the selection judgment formula for the application self-adapting adjustment, judges which kind of success rate for switching is higher at present.
3. baton handover according to claim 2 and direct-cut operation multi-stage self-adaptive selecting method is characterized in that: described step (2) is specially:
(I) read described comparative feature result, judge whether system can discern described comparative feature, if can discern then enter step (II), if can not discern then enter step (IV);
(II) rule in described comparative feature result and the first-order rule storehouse is compared, if meet with rule in the first-order rule storehouse, the switching mode that described rule is corresponding is as selection result, and step finishes; If all inconsistent, enter step (III) with the strictly all rules in the first-order rule storehouse;
(III) rule in described comparative feature result and the secondary rule base is compared, select the rule that is consistent with described comparative feature result in the secondary rule base, and the switching mode that described rule is corresponding is as selection result, step finishes;
(IV) switch the selection judgment formula according to the self adaptation adjustment, the success rate of more present baton handover mode and direct-cut operation, and the switching mode that present success rate is high is as selection result.
According to each described baton handover and direct-cut operation multi-stage self-adaptive selecting method in claim 2 or 3, it is characterized in that 4, described self adaptation adjustment is switched the selection judgment formula and is specially
The success rate of baton handover is P
1(1-P
2) W
The baton handover weights
The success rate of direct-cut operation is (1-P
1) P
2W
The direct-cut operation weights
Wherein, P
1It is baton handover success statistical probability; P
2It is direct-cut operation success statistical probability; W
The baton handover weightsBe to select baton handover weights, W
The direct-cut operation weightsBe to select the direct-cut operation weights.
5, baton handover according to claim 3 and direct-cut operation multi-stage self-adaptive selecting method is characterized in that, described step (IV) is specially:
With P
1(1-P
2) W
The baton handover weights(1-P
1) P
2W
The direct-cut operation weightsCompare, work as P
1(1-P
2) W
The baton handover weights〉=(1-P
1) P
2W
The direct-cut operation weightsThe time, select baton handover; Work as P
1(1-P
2) W
The baton handover weights＜(1-P
1) P
2W
The direct-cut operation weights, select direct-cut operation, wherein, P
1It is baton handover success statistical probability; P
2It is direct-cut operation success statistical probability; W
The baton handover weightsBe to select baton handover weights, W
The direct-cut operation weightsBe to select the direct-cut operation weights.
6, baton handover according to claim 5 and direct-cut operation multi-stage self-adaptive selecting method is characterized in that, described method is further comprising the steps of:
1. whenever once switch, then switch and select judgment formula, the parameter of rule is made amendment according to described self adaptation adjustment.
7, baton handover according to claim 6 and direct-cut operation multi-stage self-adaptive selecting method is characterized in that, 1. described step is specially:
(A) judge whether switching is successful, if successfully enter step (B), if failure enters step (E);
(B) the described successful statistical probability value of switching correspondence is increased, the continuous execution frequency of failure of described switching mode is made as 0, and whether the continuous number of success of judging described switching mode reach the maximum number of success continuously of default, is then to enter step (C), otherwise enters step (D);
(C) weights of described switching mode are improved, the continuous number of success of described switching mode is made as 0, step finishes;
(D) the continuous number of success with described switching mode increases, and step finishes;
(E) the successful statistical probability with described switching mode correspondence reduces, the continuous number of success of described switching mode is made as 0, judge that whether the continuous frequency of failure of described switching mode reaches the maximum frequency of failure continuously of default, is then to enter step (F), otherwise enters step (G);
(F) weights of described switching mode are reduced, the continuous execution frequency of failure of described switching mode is made as 0, step finishes;
(G) the continuous frequency of failure with described switching mode increases, and step finishes.
8, baton handover according to claim 7 and direct-cut operation multi-stage self-adaptive selecting method is characterized in that, described method is further comprising the steps of:
According to described step 1. in the result of parameter modification, the respective rule of described secondary rule base and described three grades of rule bases is made amendment.
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| Title |
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| 一种提高CDMA系统软切换成功率的"特征值"分析法. 周华莹，金梁，季新生.2003年通信理论与信号处理年会论文集，第03年卷. 2003 * |
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