| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating a scrambling code used in an uplink of a CDMA2000 system.SOLUTION: A received signal is first sampled in a chip frequency two times as high as that of a spread code (510), and then, is filtered by a filter adapted to the spread code and pulse shaping (520). Difference processing (530) of continuous samples is applied to the signal filtered in this way, and a differential value acquired in this way is decoded by using iterative probability propagation decoding (540). Then, the decoded value is used to specify contents of a shift register of a scrambling code at a given moment (550). |
