Despreading method and despreading device

A de-spreading method in which an auto-correlation operation between input signals time-sequentially inputted and a predetermined code is performed so that data suitable for the code is extracted from the input signals, the de-spreading method comprising:

• generating a delayed signal by delaying an input signal relatively with respect to a code;
• selecting the input signal or the delayed signal in one chip on a time division basis in accordance with a first auto-correlation operation that is an auto-correlation operation between an input signal in a predetermined receive timing and a synchronization detecting code, a second auto-correlation operation that is an auto-correlation operation between an input signal in a late timing relatively more delayed than the receive timing with respect to a synchronization detecting code and the synchronization detecting code, a third auto-correlation operation that is an auto-correlation operation between an input signal in an early timing relatively more advanced than the receive timing with respect to a synchronization detecting code and the synchronization detecting code, and a fourth auto-correlation operation that is an auto-correlation operation between an input signal in the receive timing and a data extracting code, and repeating the selection over a plurality of chips;
• performing the first to the fourth auto-correlation operations,
• wherein first to fourth unit operations, which are arithmetic operations in a chip for the first to the third auto-correlation operations between the input signal or the delayed signal selected in accordance with the first to the fourth auto-correlation operations and the synchronization detecting code, and are arithmetic operations in a chip for the fourth auto-correlation operation between the input signal or the delayed signal and the data extracting code, are performed on a time division basis in one chip and are performed repeatedly over a plurality of chips, and results of the arithmetic operations of the first to the fourth unit operations, which are obtained through the repetition, are accumulated on the first to the fourth unit operations in a plurality of continuous chips;
• and
• setting the timing of the largest correlation value among the receive timing, the late timing and the early timing, as the subsequent receive timing in accordance with the results of the first to the third auto-correlation operations, and extracting data suitable for the data extracting code.

A de-spreading method in which an auto-correlation operation between input signals time-sequentially inputted and a predetermined code is performed so that data suitable for the code is extracted from the input signals, the de-spreading method comprising:

• performing a plurality of auto-correlation operations,
• wherein unit operations each being an arithmetic operation in one chip, in a plurality of auto-correlation operations between an input signal and a plurality of sorts of data extracting codes, are performed on a time division basis and are repeatedly performed over a plurality of chips, and the unit operations obtained through the repetition are accumulated in association with a plurality of sorts of data extracting codes over a plurality of continuous chips;
• and
• extracting a plurality of data suitable for a plurality of sorts of data extracting codes in accordance with the result of the plurality of auto-correlation operations.

A de-spreading apparatus in which an auto-correlation operation between input signals time-sequentially inputted and predetermined codes is performed so that data suitable for the code is extracted from the input signals, said de-spreading apparatus comprising:

• an auto-correlation operating unit for performing a first auto-correlation operation that is an auto-correlation operation between an input signal in a predetermined receive timing and a synchronization detecting code, a second auto-correlation operation that is an auto-correlation operation between an input signal in a late timing relatively more delayed than the receive timing with respect to a synchronization detecting code and the synchronization detecting code, and a third auto-correlation operation that is an auto-correlation operation between an input signal in an early timing relatively more advanced than the receive timing with respect to a synchronization detecting code and the synchronization detecting code;
• and
• a timing generation section for setting up the timing of the largest correlation value among the receive timing, the late timing and the early timing, as the subsequent receive timing in accordance with the results of the first to the third auto-correlation operations in said auto-correlation operating unit and generating timing signals suitable for the receive timing,
• wherein said auto-correlation operating unit comprises:
• a delay circuit for delaying the input signal relatively with respect to the synchronization detecting code to generate a delayed signal, and
• an auto-correlation circuit for performing the first to the third auto-correlation operations between the input signal or the delayed signal and the synchronization detecting code on a time division basis, the signals are selected in accordance with the first to the third auto-correlation operations.

A de-spreading apparatus in which an auto-correlation operation between input signals time-sequentially inputted and a predetermined code is performed so that data suitable for the code is extracted from the input signals, said de-spreading apparatus comprising:

• an auto-correlation operating unit for performing a first auto-correlation operation that is an auto-correlation operation between an input signal in a predetermined receive timing and a synchronization detecting code, a second auto-correlation operation that is an auto-correlation operation between an input signal in a late timing relatively more delayed than the receive timing with respect to a synchronization detecting code and the synchronization detecting code, a third auto-correlation operation that is an auto-correlation operation between an input signal in an early timing relatively more advanced than the receive timing with respect to a synchronization detecting code and the synchronization detecting code, and a fourth auto-correlation operation that is an auto-correlation operation between an input signal in the receive timing and a data extracting code;
• and
• a timing generation section for setting up the timing of the largest correlation value among the receive timing, the late timing and the early timing, as the subsequent receive timing in accordance with the results of the first to the third auto-correlation operations, of the first to the fourth auto-correlation operations in said auto-correlation operating unit, and generating timing signals suitable for the receive timing,
• wherein said auto-correlation operating unit comprises:
• a delay circuit for delaying the input signal relatively with respect to the synchronization detecting code and the data extracting code to generate a delayed signal, and
• an auto-correlation circuit for performing on a time division basis the first to the fourth auto-correlation operations, wherein the first to the third auto-correlation operations are performed between the input signal or the delayed signal selected in accordance with the first to the fourth auto-correlation operations and the synchronization detecting code, and the fourth auto-correlation operation are performed between the input signal or the delayed signal and the data extracting codes.