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    • 5. 发明专利
    • DE60111278T2
    • 2006-03-16
    • DE60111278
    • 2001-01-10
    • SAMSUNG ELECTRONICS CO LTD
    • LEE KANG-MINCHUN JI-YONG
    • H04B7/26H04B1/707H04B1/7083H04B1/7087H04L7/00H04W48/16H04W64/00
    • An apparatus for searching for a cell and a method of acquiring a code unique to each cell in an asynchronous wideband Direct-Sequence Code Division Multiple Access (DS/CDMA) receiver are provided. The cell searching apparatus searches for a cell based on a received asynchronous wideband DS/CDMA signal in a receiver. The received signal includes a data channel and a synchronous channel composed of a first code commonly used in every cell and a third code indicating a code group grouping a plurality of second codes differently assigned to cells. The cell searching apparatus includes a code group identifying unit for estimating and compensating for a frequency error between the synchronous channel and an internally generated primary synchronization code, estimating and compensating for channel degradation which the synchronous channel has experienced, and performing correlation on the compensated synchronous channel and available secondary synchronization codes, thereby identifying the code group; and a scrambling code identifying unit for performing correlation on a plurality of scrambling codes belonging to the code group, thereby obtaining a scrambling code unique to each cell. By estimating and compensating a frequency error, the cell searching performance can be improved, and eventually, the cell search time can be reduced.
    • 6. 发明专利
    • DE60111278D1
    • 2005-07-14
    • DE60111278
    • 2001-01-10
    • SAMSUNG ELECTRONICS CO LTD
    • LEE KANG-MINCHUN JI-YONG
    • H04B7/26H04B1/707H04B1/7083H04B1/7087H04L7/00H04W48/16H04W64/00
    • An apparatus for searching for a cell and a method of acquiring a code unique to each cell in an asynchronous wideband Direct-Sequence Code Division Multiple Access (DS/CDMA) receiver are provided. The cell searching apparatus searches for a cell based on a received asynchronous wideband DS/CDMA signal in a receiver. The received signal includes a data channel and a synchronous channel composed of a first code commonly used in every cell and a third code indicating a code group grouping a plurality of second codes differently assigned to cells. The cell searching apparatus includes a code group identifying unit for estimating and compensating for a frequency error between the synchronous channel and an internally generated primary synchronization code, estimating and compensating for channel degradation which the synchronous channel has experienced, and performing correlation on the compensated synchronous channel and available secondary synchronization codes, thereby identifying the code group; and a scrambling code identifying unit for performing correlation on a plurality of scrambling codes belonging to the code group, thereby obtaining a scrambling code unique to each cell. By estimating and compensating a frequency error, the cell searching performance can be improved, and eventually, the cell search time can be reduced.
    • 10. 发明专利
    • DE60041220D1
    • 2009-02-12
    • DE60041220
    • 2000-05-24
    • SAMSUNG ELECTRONICS CO LTD
    • LEE KANG-MIN
    • H04B1/709H04B1/707H04J13/10H04L7/00
    • An apparatus for acquiring a pseudo noise (PN) code and a direct-sequence code division multiple access (DS-CDMA) receiver are provided. The apparatus for acquiring a pseudo noise (PN) code includes a PN code generator for generating K PN codes, a multiplexer for multiplying a received signal by + 1 or -1 according to the value of a PN code selected to be a reference code among K PN codes and outputting the multiplication result, 2 accumulators for accumulating the outputs of the multiplexer according to a predetermined control signal, a selector for outputting the control signal so that the output of the multiplexer can input to one of the accumulators according to (K-1) code values excluding the reference code, a programmable adder for adding the outputs of the accumulators to each other according to a predetermined regulation and outputting K correlation values, and a discriminator for outputting the PN code having a correlation value larger than a predetermined value among the K correlation values. It is possible to reduce the amount of operations by grouping codes during a hybrid search where K code phases are simultaneously searched by the DS-CDMA receiver and to simplify the structure of hardware.