IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0475313
(2002-04-17)
|
등록번호 |
US-7359399
(2008-04-15)
|
우선권정보 |
JP-2001-119529(2001-04-18) |
국제출원번호 |
PCT/JP02/003817
(2002-04-17)
|
§371/§102 date |
20031020
(20031020)
|
국제공개번호 |
WO02/087101
(2002-10-31)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
6 |
초록
▼
A path protection method for a CDMA reception apparatus is disclosed, which obtains correlation value levels while shifting the despreading timing of reception data little by little, searches for optimal reception timings, outputs a plurality of finger path timings, with respect to the reception dat
A path protection method for a CDMA reception apparatus is disclosed, which obtains correlation value levels while shifting the despreading timing of reception data little by little, searches for optimal reception timings, outputs a plurality of finger path timings, with respect to the reception data, as reception timings at which reception should be performed, and despreads the respective paths, thereby performing RAKE combining. If all protection paths are in the forward protection state upon execution of path backward protection and forward protection, a protection path with the lowest level is deleted, and a search path having the highest level among paths which are equal to or more than a threshold and detected by a searcher is registered in the deleted portion, thereby allowing assignment of a newly detected path even in the absence of a protection path space.
대표청구항
▼
The invention claimed is: 1. A path-protection method for a CDMA reception apparatus, characterized by comprising a finger path timing generating step of obtaining correlation value levels while shifting a despreading timing of reception data, searching for optimal reception timings, and generating
The invention claimed is: 1. A path-protection method for a CDMA reception apparatus, characterized by comprising a finger path timing generating step of obtaining correlation value levels while shifting a despreading timing of reception data, searching for optimal reception timings, and generating a plurality of finger path timings as reception timings at which reception data should be received, a detection step of despreading respective paths at the reception timings designated by the finger path timings, performing symbol synchronization, and obtaining a plurality of finger outputs, a RAKE combining step of adding and in-phase combining the plurality of finger outputs to obtain RAKE combined data; and a decoding step of decoding the RAKE combined data to obtain decoded data, wherein in the finger path timing generating step, backward protection is performed such that a reception timing which is a path detected for a first time is protected as a path in a backward protection state instead of immediately being set as a path in a synchronous state, and is determined as a path in the synchronous state only after the path is kept detected at the same reception timings as a designated backward protection stage count, forward protection is performed such that when a path detected by previous processing cannot be detected by current processing, the path is protected as a path in a forward protection state instead of immediately being deleted and setting an idle state, and is deleted from protection paths only after the path cannot be consecutively detected by the number of times equal to a designated forward protection stage count, and in the finger path timing generating step, of protection paths protected as paths in the forward protection state, at least a protection path with a lowest level is deleted, and at least a path having a highest level among currently detected paths is registered as a protection path in a deleted portion. 2. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, it is determined whether or not all the protection paths are in the forward protection state, a protection path with a lowest level is deleted if all the protection paths are in the forward protection state, and a path having a highest level among currently detected paths which are not less than a threshold is registered as a protection path in a deleted portion. 3. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, it is determined whether or not all the protection paths are paths in the forward protection state, a protection path having a largest forward protection count and a lowest level is deleted if all the protection paths are paths in the forward protection state, and a path having a highest level among currently detected paths which are not less than a threshold is registered as a protection path in a deleted portion. 4. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, it is determined whether or not all the protection paths are paths in the forward protection state, N (N is an integer not less than 1) protection paths are sequentially deleted in increasing order of levels if all the protection paths are paths in the forward protection state, and N paths, of currently detected paths which are not less than a threshold, are sequentially registered as protection paths in deleted portions in decreasing order of levels. 5. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, it is determined whether or not all the protection paths are paths in the forward protection state, N (N is an integer not less than 1) protection paths are sequentially deleted in decreasing order of forward protection counts and in increasing order of levels if all the protection paths are paths in the forward protection state, and N paths, of currently detected paths which arenot less than a threshold, are sequentially registered as protection paths in deleted portions in decreasing order of levels. 6. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, it is determined whether or not a level of a path having a highest level among currently detected paths which are not less than a threshold and not assigned to forward protection paths is not less than a predetermined threshold, a protection path with a lowest level is deleted if the level is not less than the predetermined threshold, and a path having a highest level among currently detected paths which are not less than a threshold is registered as a protection path in a deleted portion. 7. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, it is determined whether or not a level of a path having a highest level among currently detected paths which are not less than a threshold and not assigned to forward protection paths is not less than a predetermined threshold, a protection path with the largest forward protection count and the lowest level is deleted if the level is not less than the predetermined threshold, and a path having a highest level among-currently detected paths which are not less than a threshold is registered as a protection path in a deleted portion. 8. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, whether N>=1 is determined by counting path count=N, of currently detected paths which are not less than a threshold and not assigned to the protection paths, which are not less than a predetermined threshold in decreasing order of levels, a maximum of N protection paths which are in the forward protection state are deleted in increasing order of levels if N >=1, and N paths, of currently detected paths which are not less than a threshold, are sequentially registered as protection paths in deleted portions in decreasing order of levels. 9. A path protection method for a CDMA reception apparatus according to claim 1, characterized in that in the finger path timing generating step, whether N>=1 is determined by counting path count=N, of currently detected paths which are not less than a threshold and not assigned to the protection paths, which are not less than a predetermined threshold in decreasing order of the forward protection counts and in increasing order of levels, a maximum of N protection paths which are in the forward protection state are deleted in increasing order of levels if N>=1, and N paths, of currently detected paths which are not less than a threshold, are sequentially registered as protection paths in deleted portions in decreasing order of levels.
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