CN102118180B - Parallel interference cancellation method used for CDMA communication system - Google Patents
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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 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, takes full advantage of a plurality of users' information, and a plurality of users are carried out to joint-detection, thereby reduce as far as possible multiple access, disturbs the impact on receiver performance.
At present, optimum multiuser detection is Maximum likelihood sequence detection, this method performance is efficient, but computational complexity is very big, be difficult to use in actual hardware system, therefore, must find the suboptimum multi-user test method of lower complexity, wherein, interference cancellation method, because of the good compromise of its complexity and performance, receives more concern.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, carry out the power sequence to subscriber signal; Then, get wherein prominent subscriber signal, it is adjudicated to detection, then follow, this subscriber signal is carried out to this locality regeneration; Then, this subscriber signal is removed from receive signal, again the subscriber signal of current power maximum is adjudicated to detection, by that analogy, finally the subscriber signal of power minimum in all reception signals is regenerated.The counteracting serial interference method is easy to realize, but its time delay is larger, and need to carry out the power sequence, and initialize signal is estimated to sensitivity, exists in use stronger error propagation phenomenon, limited to the performance boost of system.
The Parallel Interference Cancellation method, also to adopt multistage mode, but different from the counteracting serial interference method is, the Parallel Interference Cancellation method, adjudicated simultaneously, regenerated and eliminate all multiple access and disturb in every one-level, utilize all users' of information structuring of prime judgement interference signal, then balance out interference signal from receive signal, the method has the advantages that processing delay is little, amount of calculation is large, with compare alone family detection method obvious performance advantage arranged, therefore, the Parallel Interference Cancellation method is a kind of multi-user test method that relatively is applicable to cdma system.
Cdma communication system has adopted general Rake receiver, also effectively merge the multipath signal energy for separating of multipath signal, but this kind of general Rake receiver is in the situation that multipath, because can producing between serious user's internal symbol, disturbs the imperfect orthogonal property of the signal in cdma communication system, make the performance of Rake receiver worsen, cause the error propagation of signal.For solving described multipath interference problem, worked out a kind of Cancellation of the IC-Rake(Interferences for multi-path Interference Cancellation, the band Interference Cancellation) receiver, this kind of receiver not only comprises the function of general receiver, but also multipath signal is carried out to multi-path Interference Cancellation, the multipath that has suppressed well to exist in 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 equally interference problem between user's internal symbol, caused the error propagation to subscriber signal in the Parallel Interference Cancellation structure, and due to this error code phenomenon, affect the multiple access Interference Cancellation between the user that the method carries out, thereby lowered the cdma system system to the detection of subscriber signal and the capacity of cdma communication system.
Summary of the invention
The present invention proposes a kind of method of the Parallel Interference Cancellation for cdma communication system, the technical problem solved is, not only eliminate due to the phenomenon of the error propagation to subscriber signal caused with indoor intersymbol interference in prior art, realize the accurate propagation of subscriber signal, and promote the detectability of cdma communication system to subscriber signal, thereby realize the lifting of cdma communication system capacity.
A kind of method of the Parallel Interference Cancellation for cdma communication system, use at least Parallel Interference Cancellation PIC structure of two-stage, in the described Parallel Interference Cancellation PIC of every one-level structure, to each input signal is parallel, processed, each subscriber signal of baseband signal is as each input signal in the described Parallel Interference Cancellation PIC of 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 k level structure, each soft bit information in the described Parallel Interference Cancellation PIC of afterbody structure is as the output signal of whole described Parallel Interference Cancellation PIC structure, it is characterized in that,
Every one-level of Parallel Interference Cancellation PIC structure, except afterbody, comprises the following steps:
Step 1, each receives corresponding input signal and is correspondingly processed with Interference Cancellation IC-Rake receiver, obtains the channel estimating information of input signal of described correspondence and the soft bit information after multi-path Interference Cancellation;
Step 2, according to 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 to 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 to multiple access interference cancellation, obtain and export each subscriber signal after multiple access interference cancellation;
The afterbody of Parallel Interference Cancellation PIC structure comprises step:
Each receives corresponding input signal and is correspondingly processed with Interference Cancellation IC-Rake receiver, obtains and export the channel estimating information of this grade of input signal and the soft bit information after multi-path Interference Cancellation.
The present invention proposes a kind of method of the Parallel Interference Cancellation 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 due 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 to subscriber signal, thereby promoted the capacity of cdma communication system.
The accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the present invention for the Parallel Interference Cancellation method of cdma communication system;
Fig. 2 is the schematic flow sheet that the present invention uses the IC-Rake receiver of counteracting serial interference structure;
Fig. 3 is the schematic flow sheet that the present invention uses the IC-Rake receiver of Parallel Interference Cancellation structure.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated:
A kind of method of the Parallel Interference Cancellation for cdma communication system, its schematic flow sheet as shown in Figure 1, a kind of method of the Parallel Interference Cancellation for cdma communication system, use at least Parallel Interference Cancellation PIC structure of two-stage, in the described Parallel Interference Cancellation PIC of every one-level structure, to each input signal is parallel, processed, each subscriber signal of baseband signal is as each input signal in the described Parallel Interference Cancellation PIC of 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 k level structure, each soft bit information in the described Parallel Interference Cancellation PIC of afterbody structure is as the output signal of whole described Parallel Interference Cancellation PIC structure,
For the Parallel Interference Cancellation structure, progression is more, and multiple access interference cancellation ground is more thorough, but also be accompanied by simultaneously time delay larger with the larger problem of amount of calculation, 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 after each multi-path Interference Cancellation in the PIC structure of the second level is as the output signal of whole described Parallel Interference Cancellation PIC structure.
Every one-level of Parallel Interference Cancellation PIC structure, except afterbody, comprises the following steps:
Step 1, each receives corresponding input signal and is correspondingly processed with Interference Cancellation IC-Rake receiver, obtains the channel estimating information of input signal of described correspondence and the soft bit information after multi-path Interference Cancellation;
Step 2, according to 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 to 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 to multiple access interference cancellation, obtain and export each subscriber signal after multiple access interference cancellation;
The afterbody of described Parallel Interference Cancellation PIC structure comprises step:
Each receives corresponding input signal and is correspondingly processed with Interference Cancellation IC-Rake receiver, obtains the channel estimating information of this grade of input signal and the soft bit information after multi-path Interference Cancellation.
As a kind of embodiment, describedly with Interference Cancellation IC-Rake receiver, receive corresponding input signal and be correspondingly processed, 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 to 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 after multi-path Interference Cancellation in n-1 circulation circulates as n, when the signal to be demodulated after described multi-path Interference Cancellation only comprises the signal component in a footpath, only perform step 1031, and stop circulation, perform step 104:
Step 1031, described signal to be demodulated is carried out to demodulation, obtain the soft bit of the prominent signal component in described signal to be demodulated;
Step 1032, described prominent signal component is carried out to local signal regeneration, obtain the regenerated signal of described prominent signal component;
Step 1033, according to described regenerated signal, described signal to be demodulated is carried out to multi-path Interference Cancellation, obtain the signal to be demodulated after multi-path Interference Cancellation;
Step 104, the soft bit of described each footpath signal component of obtaining is carried out to the multipath merging, obtain the soft bit information of the input signal of described correspondence.
As another embodiment, described band Interference Cancellation IC-Rake receiver, adopt at least the second Parallel Interference Cancellation PIC structure of two-stage (described the second Parallel Interference Cancellation PIC structure, with above-mentioned Parallel Interference Cancellation PIC structure, be identical, 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, Parallel Interference Cancellation PIC structure called after the second Parallel Interference Cancellation PIC structure that the IC-Rake receiver is used)
Describedly with Interference Cancellation IC-Rake receiver, receive corresponding input signal and be correspondingly processed, 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 to 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 described the second Parallel Interference Cancellation PIC structure of the first order, each output signal of described the second Parallel Interference Cancellation PIC structure of m-1 level is as each input signal in described the second Parallel Interference Cancellation PIC structure of m level, each soft bit information in described the second Parallel Interference Cancellation PIC structure of afterbody is as the output signal of whole described the second Parallel Interference Cancellation PIC structure
Every one-level of described the second Parallel Interference Cancellation PIC structure, except afterbody, specifically comprises the following steps:
Step 1031, to this grade of input signal is parallel, carry out demodulation, obtain the soft bit of each footpath signal component of described this grade of input signal;
Step 1032, according to the soft bit of each footpath signal component of described this grade of 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 to multi-path Interference Cancellation, obtain and export each footpath signal component of the input signal of the described correspondence after multi-path Interference Cancellation;
The afterbody of described the second Parallel Interference Cancellation PIC structure specifically comprises the following steps:
Step 1034, to this grade of input signal is parallel, carry out demodulation, obtain the soft bit of each footpath signal component of this grade of input signal;
The soft bit of described each footpath signal component of step 1035, this grade of input signal that will obtain carries out the multipath merging, 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 more, multipath disturbs elimination ground more thorough, but also be accompanied by simultaneously time delay larger with the larger problem of amount of calculation, 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 every one-level, 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 multiaerial system.
Above-described embodiment of the present invention, do not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (7)
1. the method for the Parallel Interference Cancellation for cdma communication system, use at least Parallel Interference Cancellation PIC structure of two-stage, in the described Parallel Interference Cancellation PIC of every one-level structure, to each input signal is parallel, processed, each subscriber signal of baseband signal is as each input signal in the described Parallel Interference Cancellation PIC of 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 k level structure, each soft bit information in the described Parallel Interference Cancellation PIC of afterbody structure is as the output signal of whole described Parallel Interference Cancellation PIC structure, it is characterized in that,
Every one-level of described Parallel Interference Cancellation PIC structure, except afterbody, comprises the following steps:
Step 1, each receives corresponding input signal and is correspondingly processed with Interference Cancellation IC-Rake receiver, obtains the channel estimating information of input signal of described correspondence and the soft bit information after multi-path Interference Cancellation;
Step 2, according to 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 to 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 to multiple access interference cancellation, obtain and export each subscriber signal after multiple access interference cancellation;
The afterbody of Parallel Interference Cancellation PIC structure comprises step:
Each receives corresponding input signal and is correspondingly processed with Interference Cancellation IC-Rake receiver, obtains and export the channel estimating information of this grade of input signal and the soft bit information after multi-path Interference Cancellation.
2. the method for the Parallel Interference Cancellation for cdma communication system according to claim 1 is characterized in that: describedly with Interference Cancellation IC-Rake receiver, receives corresponding input signal and is correspondingly processed, specific as follows:
Step 101, receive the input signal of described correspondence, and the input signal of described correspondence is carried out to 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 after multi-path Interference Cancellation in n-1 circulation circulates as n, when the signal to be demodulated after described multi-path Interference Cancellation only comprises the signal component in a footpath, only perform step 1031, and stop circulation, perform step 104:
Step 1031, described signal to be demodulated is carried out to demodulation, obtain the soft bit of the prominent signal component in described signal to be demodulated;
Step 1032, according to described soft bit, described prominent signal component is carried out to local signal regeneration, obtain the regenerated signal of described prominent signal component;
Step 1033, according to described regenerated signal, described signal to be demodulated is carried out to multi-path Interference Cancellation, obtain the signal to be demodulated after multi-path Interference Cancellation;
Step 104, the soft bit of described each footpath signal component of obtaining is carried out to the multipath merging, obtain the soft bit information of the input signal of described correspondence.
3. the method for the Parallel Interference Cancellation for cdma communication system according to claim 1 is characterized in that: describedly with Interference Cancellation IC-Rake receiver, receives corresponding input signal and is correspondingly processed, specific as follows:
Step 101, receive the input signal of described correspondence, and the input signal of described correspondence is carried out to 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 the second Parallel Interference Cancellation PIC structure of two-stage, each footpath signal component of the input signal of described correspondence is as each input signal in described the second Parallel Interference Cancellation PIC structure of the first order, each output signal of described the second Parallel Interference Cancellation PIC structure of m-1 level is as each input signal in described the second Parallel Interference Cancellation PIC structure of m level, each soft bit information in described the second Parallel Interference Cancellation PIC structure of afterbody is as the output signal of whole described the second Parallel Interference Cancellation PIC structure
Every one-level of described the second Parallel Interference Cancellation PIC structure, except afterbody, specifically comprises the following steps:
Step 1031, to this grade of input signal is parallel, carry out demodulation, obtain the soft bit of each footpath signal component of described this grade of input signal;
Step 1032, according to the soft bit of each footpath signal component of described this grade of 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 of input signal carried out to multi-path Interference Cancellation, obtain and export each footpath signal component of described this grade of input signal after multi-path Interference Cancellation;
The afterbody of described the second Parallel Interference Cancellation PIC structure specifically comprises the following steps:
Step 1034, to this grade of input signal is parallel, carry out demodulation, obtain the soft bit of each footpath signal component of this grade of input signal;
The soft bit of described each footpath signal component of step 1035, this grade of input signal that will obtain carries out the multipath merging, obtains and export the soft bit information of the input signal of described correspondence;
Described the second Parallel Interference Cancellation PIC structure, for distinguishing with described Parallel Interference Cancellation PIC structure.
4. the method for the Parallel Interference Cancellation for cdma communication system according to claim 3, it is characterized in that: the level of described the second Parallel Interference Cancellation structure PIC structure is 2 or 3 grades.
5. according to the described method of the Parallel Interference Cancellation for cdma communication system of claim 1-4 any one, it is characterized in that: the level of described Parallel Interference Cancellation PIC structure is 2 or 3 grades.
6. according to the described method of the Parallel Interference Cancellation for cdma communication system of claim 1-4 any one, it is characterized in that: described Parallel Interference Cancellation method is applied to WCDMA system, CDMA2000 or TD-SCDMA system.
7. according to the described method of the Parallel Interference Cancellation for cdma communication system of claim 1-4 any one, it is characterized in that: described Parallel Interference Cancellation method is applied to a single aerial system or multiaerial system.
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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 |
| 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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