CN102118180A - Parallel interference cancellation method used for CDMA communication system - Google Patents
Parallel interference cancellation method used for CDMA communication system Download PDFInfo
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Abstract
The invention provides a parallel interference cancellation method used for a code-division multiple access (CDMA) communication system. The method not only eliminates an error code propagation phenomenon caused by an intersymbol interference in a user, but also improves the user signal detection capacity of the CDMA communication system, so that the improvement on the capacity of the CDMA communication system is realized. The method comprises the following steps of: outputting channel estimation information corresponding to an input signal and soft bit information subjected to multipath interference cancellation by using an interferences cancellation (IC-Rake) receiver in each parallel interferences cancellation (PIC) structure; according to the soft bit information and the channel estimation information, performing local signal regeneration on the corresponding input signal to obtain a regeneration signal of the corresponding input signal; and performing multi-access interference cancellation on a base band signal according to the regeneration signal, wherein the obtained signal, subjected to the multi-access interference cancellation, serves as the input signal of a next-stage PIC structure, and the soft bit information, in the last-stage PIC structure, serves as an output signal of the overall PIC structure.
Description
Technical field
The present invention relates to CDMA(Code-Division Multiple Access, code division multiple access) communication system technical field, particularly the Parallel Interference Cancellation method in the cdma communication system.
Background technology
At present, cdma communication system has become one of essential basic technology of 3G (Third Generation) Moblie because of its intrinsic advantage, and the problem that multiple access disturbs has limited the capacity of cdma communication system and the lifting of performance.
In the technology of existing elimination multiple access interference problem, what adopt often is multiuser detection, has made full use of a plurality of users' information, and a plurality of users are carried out joint-detection, disturbs the receiver Effect on Performance thereby reduce multiple access as far as possible.
At present, optimum multiuser detection is a Maximum likelihood sequence detection, this method performance is efficient, but computational complexity is very big, is difficult to use in the hardware system of reality, therefore, must seek the suboptimum multi-user test method of lower complexity, wherein, interference cancellation method receives more concern because of the good compromise of its complexity and performance.Interference cancellation method generally is divided into counteracting serial interference method and Parallel Interference Cancellation (Parallel Interferences Cancellation, PIC) method.
The counteracting serial interference method at first, is carried out the power ordering to subscriber signal; Then, get wherein prominent subscriber signal, it is adjudicated detection, follow again, this subscriber signal is carried out this locality regeneration; Then, this subscriber signal is removed from received signal, once more the subscriber signal of current power maximum is adjudicated detection, by that analogy, at last the subscriber signal of power minimum in all received signals is regenerated.The counteracting serial interference method is easy to realize, but its time-delay is bigger, and need carry out the power ordering, and initialize signal is estimated sensitivity, exists stronger error propagation phenomenon in use, and is limited to the performance boost of system.
The Parallel Interference Cancellation method, also be to adopt multistage mode, but different with the counteracting serial interference method is, the Parallel Interference Cancellation method, adjudicate simultaneously, regenerate and eliminate all multiple access and disturb in each level, utilize all users' of information structuring of prime judgement interference signal, from received signal, balance out interference signal then, this method has the advantages that processing delay is little, amount of calculation is big, with compare single user's detection method tangible performance advantage arranged, therefore, the Parallel Interference Cancellation method is a kind of multi-user test method that relatively is fit to cdma system.
Cdma communication system has adopted general Rake receiver, be used for the separating multiple diameter signal and merge the multipath signal energy effectively, but the general Rake receiver of this kind is under the situation of multipath, because the imperfect orthogonal property of the signal in the cdma communication system can produce between serious user's internal symbol and disturb, make the mis-behave of Rake receiver, cause the error propagation of signal.For solving described multipath interference problem, worked out a kind of IC-Rake(Interferences Cancellation that is used for the multipath Interference Cancellation, the band Interference Cancellation) receiver, this kind receiver not only comprises the function of general receiver, but also multipath signal is carried out the multipath Interference Cancellation, the multipath that has suppressed well to exist in the communication disturbs, and has improved the propagation precision of signal.
And existing Parallel Interference Cancellation method has adopted general Rake receiver, under multi-path environment, there is interference problem between user's internal symbol equally, caused the error propagation in the Parallel Interference Cancellation structure to subscriber signal, and because this error code phenomenon, influenced the multiple access Interference Cancellation between the user that this method carries out, thereby lowered the cdma system system the detection of subscriber signal and the capacity of cdma communication system.
Summary of the invention
The present invention proposes a kind of Parallel Interference Cancellation method that is used for cdma communication system, the technical problem that solves is, not only eliminate owing to the error propagation phenomenon that causes with indoor intersymbol interference in the prior art subscriber signal, realize the accurate propagation of subscriber signal, and promote the detectability of cdma communication system, thereby realize the lifting of cdma communication system capacity to subscriber signal.
A kind of Parallel Interference Cancellation method that is used for cdma communication system, use the Parallel Interference Cancellation PIC structure of two-stage at least, in the described Parallel Interference Cancellation PIC of each grade structure, handle each input signal is parallel, each subscriber signal of baseband signal is as each input signal in the described Parallel Interference Cancellation PIC of the first order structure, each output signal of the described Parallel Interference Cancellation PIC of k-1 level structure is as each input signal in the described Parallel Interference Cancellation PIC of the k level structure, each soft bit information in the described Parallel Interference Cancellation PIC of the afterbody structure is as the output signal of whole described Parallel Interference Cancellation PIC structure, it is characterized in that
Each level of Parallel Interference Cancellation PIC structure except afterbody, may further comprise the steps:
Step 1, each band Interference Cancellation IC-Rake receiver receive corresponding input signal and also are correspondingly processed, and obtain the channel estimating information of input signal of described correspondence and the soft bit information behind the multipath Interference Cancellation;
Step 2, according to the described soft bit information and the described channel estimating information of the input signal of each described correspondence, the input signal of each described correspondence is carried out local signal regeneration, obtain the regenerated signal of the input signal of each described correspondence;
Step 3, according to the described regenerated signal of the input signal of each described correspondence, described baseband signal is carried out multiple access interference cancellation, obtain and export each subscriber signal after the multiple access interference cancellation;
The afterbody of Parallel Interference Cancellation PIC structure comprises step:
Each band Interference Cancellation IC-Rake receiver receives corresponding input signal and is correspondingly processed, and obtains and export the channel estimating information of this grade input signal and the soft bit information behind the multipath Interference Cancellation.
The present invention proposes a kind of Parallel Interference Cancellation method that is used for cdma communication system, used band Interference Cancellation IC-Rake receiver, eliminated user's internal symbol interference problem, solved the Parallel Interference Cancellation structure use general receiver owing to the problems referred to above cause to subscriber signal error propagation phenomenon, realize the accurate propagation of subscriber signal, and promoted the detectability of cdma communication system, thereby promoted the capacity of cdma communication system to subscriber signal.
Description of drawings
Fig. 1 is used for the schematic flow sheet of the Parallel Interference Cancellation method of cdma communication system for the present invention;
Fig. 2 uses the schematic flow sheet of the IC-Rake receiver of counteracting serial interference structure for the present invention;
Fig. 3 uses the schematic flow sheet of the IC-Rake receiver of Parallel Interference Cancellation structure for the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples:
A kind of Parallel Interference Cancellation method that is used for cdma communication system, its schematic flow sheet as shown in Figure 1, a kind of Parallel Interference Cancellation method that is used for cdma communication system, use the Parallel Interference Cancellation PIC structure of two-stage at least, in the described Parallel Interference Cancellation PIC of each grade structure, handle each input signal is parallel, each subscriber signal of baseband signal is as each input signal in the described Parallel Interference Cancellation PIC of the first order structure, each output signal of the described Parallel Interference Cancellation PIC of k-1 level structure is as each input signal in the described Parallel Interference Cancellation PIC of the k level structure, and each soft bit information in the described Parallel Interference Cancellation PIC of the afterbody structure is as the output signal of whole described Parallel Interference Cancellation PIC structure;
For the Parallel Interference Cancellation structure, progression is many more, and multiple access interference cancellation ground is thorough more, but also is accompanied by the big more and big more problem of amount of calculation of time delay simultaneously, last on the contrary to not promoting the performance of method, so the progression of Parallel Interference Cancellation structure generally adopts two-stage or three grades.
As a kind of preferred embodiment, the present invention adopts two-stage PIC structure, baseband signal is as the input signal of first order PIC structure, each user's of first order PIC structure output signal is as the input signal of second level PIC structure, and the soft bit information behind each multipath Interference Cancellation in the PIC structure of the second level is as the output signal of whole described Parallel Interference Cancellation PIC structure.
Each level of Parallel Interference Cancellation PIC structure except afterbody, may further comprise the steps:
Step 1, each band Interference Cancellation IC-Rake receiver receive corresponding input signal and also are correspondingly processed, and obtain the channel estimating information of input signal of described correspondence and the soft bit information behind the multipath Interference Cancellation;
Step 2, according to the described soft bit information and the described channel estimating information of the input signal of each described correspondence, the input signal of each described correspondence is carried out local signal regeneration, obtain the regenerated signal of the input signal of each described correspondence;
Step 3, according to the described regenerated signal of the input signal of each described correspondence, described baseband signal is carried out multiple access interference cancellation, obtain and export each subscriber signal after the multiple access interference cancellation;
The afterbody of described Parallel Interference Cancellation PIC structure comprises step:
Each band Interference Cancellation IC-Rake receiver receives corresponding input signal and is correspondingly processed, and obtains the channel estimating information of this grade input signal and the soft bit information behind the multipath Interference Cancellation.
As a kind of embodiment, described band Interference Cancellation IC-Rake receiver receives corresponding input signal and also is correspondingly processed, and is specific as follows, as Fig. 2:
Step 101, receive the input signal of described correspondence, and the input signal of described correspondence is carried out channel estimating, obtain the channel estimating information of the input signal of described correspondence;
Step 102, according to the watt level of each footpath signal component of the input signal of described correspondence, described each footpath signal component is sorted;
Following steps 1031,1032,1033 are carried out in step 103, circulation, and the input signal of described correspondence is as the signal to be demodulated in first circulation, signal to be demodulated during signal to be demodulated behind the multipath Interference Cancellation in n-1 circulation circulates as n, when the signal to be demodulated behind the described multipath Interference Cancellation only comprises the signal component in a footpath, execution in step 1031, and stop circulating execution in step 104:
Step 1031, described signal to be demodulated is carried out demodulation, obtain the soft bit of the prominent signal component in the described signal to be demodulated;
Step 1032, described prominent signal component is carried out local signal regeneration, obtain the regenerated signal of described prominent signal component;
Step 1033, according to described regenerated signal, described band restituted signal is carried out the multipath Interference Cancellation, obtain the signal to be demodulated behind the multipath Interference Cancellation;
The soft bit of step 104, described each footpath signal component that will obtain carries out multipath and merges, and obtains the soft bit information of the input signal of described correspondence.
As another embodiment; Described band Interference Cancellation IC-Rake receiver; Adopt at least second Parallel Interference Cancellation PIC structure of two-stage (the described second Parallel Interference Cancellation PIC structure; Identical with above-mentioned Parallel Interference Cancellation PIC structure; But the Parallel Interference Cancellation PIC structure of using for the Parallel Interference Cancellation PIC structure of distinguishing above-mentioned use and IC-Rake receiver; The Parallel Interference Cancellation PIC structure called after second Parallel Interference Cancellation PIC structure with the use of IC-Rake receiver)
Described band Interference Cancellation IC-Rake receiver receives corresponding input signal and also is correspondingly processed, and is specific as follows, as Fig. 3:
Step 101, receive the input signal of described correspondence, and the input signal of described correspondence is carried out channel estimating, obtain the channel estimating information of the input signal of described correspondence;
Step 102, according to the watt level of each footpath signal component of the input signal of described correspondence, described each footpath signal component is sorted;
Each footpath signal component of the input signal of step 103, described correspondence is as each input signal in the described second Parallel Interference Cancellation PIC structure of the first order, each output signal of the described second Parallel Interference Cancellation PIC structure of m-1 level is as each input signal in the described second Parallel Interference Cancellation PIC structure of m level, each soft bit information in the described second Parallel Interference Cancellation PIC structure of afterbody is as the output signal of the whole described second Parallel Interference Cancellation PIC structure
Each level of the described second Parallel Interference Cancellation PIC structure except afterbody, specifically may further comprise the steps:
Step 1031, carry out demodulation, obtain the soft bit of each footpath signal component of described this grade input signal this grade input signal is parallel;
Step 1032, according to the soft bit of each footpath signal component of described this grade input signal, carry out local signal regeneration to described each footpath signal component is parallel, obtain the regenerated signal of described each footpath signal component;
Step 1033, according to the regenerated signal of described each footpath signal component, the input signal of described correspondence is carried out the multipath Interference Cancellation, obtain and export each footpath signal component of the input signal of the described correspondence behind the multipath Interference Cancellation;
The afterbody of the described second Parallel Interference Cancellation PIC structure specifically may further comprise the steps:
Step 1034, carry out demodulation, obtain the soft bit of each footpath signal component of this grade input signal this grade input signal is parallel;
The soft bit of described each footpath signal component of step 1035, this grade input signal that will obtain carries out multipath and merges, and obtains and export the soft bit information of the input signal of described correspondence;
Equally, the second Parallel Interference Cancellation PIC structure that corresponding IC-Rake receiver adopts, progression is many more, multipath interference eliminated ground is thorough more, but also be accompanied by the big more and big more problem of amount of calculation of time delay simultaneously, last on the contrary to not promoting the performance of method, so the progression of Parallel Interference Cancellation structure generally adopts two-stage or three grades.
The Parallel Interference Cancellation method that the present invention proposes, adopted described Parallel Interference Cancellation PIC structure, IC-Rake receiver in the structure of each grade, can only use counteracting serial interference structure (being the counteracting serial interference method) or Parallel Interference Cancellation structure, also can two kinds of structures mix use.
The Parallel Interference Cancellation method that the present invention proposes not only can be applied to cdma communication system, can also be applied to the expanding system of cdma communication system, as WCDMA system, CDMA2000 or TD-SCDMA system.
The Parallel Interference Cancellation method that the present invention proposes can be applied to a single aerial system, also can be applied in the multiaerial system.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (7)
1. Parallel Interference Cancellation method that is used for cdma communication system, use the Parallel Interference Cancellation PIC structure of two-stage at least, in the described Parallel Interference Cancellation PIC of each grade structure, handle each input signal is parallel, each subscriber signal of baseband signal is as each input signal in the described Parallel Interference Cancellation PIC of the first order structure, each output signal of the described Parallel Interference Cancellation PIC of k-1 level structure is as each input signal in the described Parallel Interference Cancellation PIC of the k level structure, each soft bit information in the described Parallel Interference Cancellation PIC of the afterbody structure is as the output signal of whole described Parallel Interference Cancellation PIC structure, it is characterized in that
Each level of described Parallel Interference Cancellation PIC structure except afterbody, may further comprise the steps:
Step 1, each band Interference Cancellation IC-Rake receiver receive corresponding input signal and also are correspondingly processed, and obtain the channel estimating information of input signal of described correspondence and the soft bit information behind the multipath Interference Cancellation;
Step 2, according to the described soft bit information and the described channel estimating information of the input signal of each described correspondence, the input signal of each described correspondence is carried out local signal regeneration, obtain the regenerated signal of the input signal of each described correspondence;
Step 3, according to the described regenerated signal of the input signal of each described correspondence, described baseband signal is carried out multiple access interference cancellation, obtain and export each subscriber signal after the multiple access interference cancellation;
The afterbody of Parallel Interference Cancellation PIC structure comprises step:
Each band Interference Cancellation IC-Rake receiver receives corresponding input signal and is correspondingly processed, and obtains and export the channel estimating information of this grade input signal and the soft bit information behind the multipath Interference Cancellation.
2. the Parallel Interference Cancellation method that is used for cdma communication system according to claim 1 is characterized in that: described band Interference Cancellation IC-Rake receiver receives corresponding input signal and is correspondingly processed, and is specific as follows:
Step 101, receive the input signal of described correspondence, and the input signal of described correspondence is carried out channel estimating, obtain the channel estimating information of the input signal of described correspondence;
Step 102, according to the watt level of each footpath signal component of the input signal of described correspondence, described each footpath signal component is sorted;
Following steps 1031,1032,1033 are carried out in step 103, circulation, and the input signal of described correspondence is as the signal to be demodulated in first circulation, signal to be demodulated during signal to be demodulated behind the multipath Interference Cancellation in n-1 circulation circulates as n, when the signal to be demodulated behind the described multipath Interference Cancellation only comprises the signal component in a footpath, execution in step 1031, and stop circulating execution in step 104:
Step 1031, described signal to be demodulated is carried out demodulation, obtain the soft bit of the prominent signal component in the described signal to be demodulated;
Step 1032, according to described soft bit, described prominent signal component is carried out local signal regeneration, obtain the regenerated signal of described prominent signal component;
Step 1033, according to described regenerated signal, described band restituted signal is carried out the multipath Interference Cancellation, obtain the signal to be demodulated behind the multipath Interference Cancellation;
The soft bit of step 104, described each footpath signal component that will obtain carries out multipath and merges, and obtains the soft bit information of the input signal of described correspondence.
3. the Parallel Interference Cancellation method that is used for cdma communication system according to claim 1 is characterized in that: described band Interference Cancellation IC-Rake receiver receives corresponding input signal and is correspondingly processed, and is specific as follows:
Step 101, receive the input signal of described correspondence, and the input signal of described correspondence is carried out channel estimating, obtain the channel estimating information of the input signal of described correspondence;
Step 102, according to the watt level of each footpath signal component of the input signal of described correspondence, described each footpath signal component is sorted;
Step 103, adopt at least second Parallel Interference Cancellation PIC structure of two-stage; Each footpath component of signal of the input signal of described correspondence is as each input signal in the described second Parallel Interference Cancellation PIC structure of the first order; Each output signal of the described second Parallel Interference Cancellation PIC structure of m-1 level is as each input signal in the described second Parallel Interference Cancellation PIC structure of m level; Each soft bit information in the described second Parallel Interference Cancellation PIC structure of afterbody is as the output signal of the whole described second Parallel Interference Cancellation PIC structure
Each level of the described second Parallel Interference Cancellation PIC structure except afterbody, specifically may further comprise the steps:
Step 1031, carry out demodulation, obtain the soft bit of each footpath signal component of described this grade input signal this grade input signal is parallel;
Step 1032, according to the soft bit of each footpath signal component of described this grade input signal, carry out local signal regeneration to described each footpath signal component is parallel, obtain the regenerated signal of described each footpath signal component;
Step 1033, according to the regenerated signal of described each footpath signal component, described this grade input signal is carried out the multipath Interference Cancellation, obtain and export each footpath signal component of described this grade input signal behind the multipath Interference Cancellation;
The afterbody of the described second Parallel Interference Cancellation PIC structure specifically may further comprise the steps:
Step 1034, carry out demodulation, obtain the soft bit of each footpath signal component of this grade input signal this grade input signal is parallel;
The soft bit of described each footpath signal component of step 1035, this grade input signal that will obtain carries out multipath and merges, and obtains and export the soft bit information of the input signal of described correspondence;
The described second Parallel Interference Cancellation PIC structure is used for distinguishing with described Parallel Interference Cancellation PIC structure.
4. the Parallel Interference Cancellation method that is used for cdma communication system according to claim 3 is characterized in that: the level of the described second Interference Cancellation structure PIC structure is 2 or 3 grades.
5. according to each described Parallel Interference Cancellation method that is used for cdma communication system of claim 1-4, it is characterized in that: the level of described Parallel Interference Cancellation PIC structure is 2 or 3 grades.
6. according to each described Parallel Interference Cancellation method that is used for cdma communication system of claim 1-4, it is characterized in that: described Parallel Interference Cancellation method is applied to WCDMA system, CDMA2000 or TD-SCDMA system.
7. according to each described Parallel Interference Cancellation method that is used for cdma communication system of claim 1-4, it is characterized in that: described Parallel Interference Cancellation method is applied to a single aerial system or multiaerial system.
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| CN1870444A (en) * | 2005-05-24 | 2006-11-29 | 都科摩（北京）通信技术研究中心有限公司 | Partial parallel interference removing receiver and partial parallel interference removing method |
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| CN1411189A (en) * | 2001-10-09 | 2003-04-16 | 华为技术有限公司 | Simplified algorithm of double layer weighted parallel interference cancellation algorithm |
| CN1505294A (en) * | 2002-12-05 | 2004-06-16 | 华为技术有限公司 | A multi-user receiving device of uplink dedicated physical channel in WCDMA system |
| US20050107057A1 (en) * | 2003-10-10 | 2005-05-19 | Kabushiki Kaisha Toshiba | MIMO communication system |
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