发明名称 |
DEVICE AND METHOD FOR INITIALLY SYNCHRONIZING SPREAD-SPECTRUM CODE OF CDMA TRANSMISSION SYSTEM |
摘要 |
A CDMA system which can quickly establish initial synchronization of long codes which are spread-spectrum codes having periods which are much longer than the symbol length. The system inserts a priori codes which have a correlation value of nearly zero with respect to the long codes and an autocorrelation value which changes triangularly into spread-spectrum signals whose bandwidth is spread by the long codes at regular intervals, detects the timing at which reception of a priori codes is started, and estimates the reception phase of the long codes. The system is provided with an a priori code inserting circuit on the transmitting side and an a priori code replica generating circuit on the receiving side. The system is also provided with a plurality of correlators for finding the correlation value between the received signal and the replica of the a priori signal and a circuit for finding the maximum correlation value among the correlation values and its reception starting timing. The system estimates the timing at which that a priori signal is received from the reception starting timing at which the maximum correlation value is obtained, and infers that the point of time at a fixed time interval from the estimated timing is the point of phase reception of the long codes.
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申请公布号 |
WO9620544(A1) |
申请公布日期 |
1996.07.04 |
申请号 |
WO1995JP02718 |
申请日期 |
1995.12.27 |
申请人 |
NTT MOBILE COMMUNICATIONS NETWORK INC.;HIGUCHI, KENICHI;SAWAHASHI, MAMORU;ADACHI, FUMIYUKI |
发明人 |
HIGUCHI, KENICHI;SAWAHASHI, MAMORU;ADACHI, FUMIYUKI |
分类号 |
H04B1/707;H04J3/06;H04J13/00;(IPC1-7):H04J13/04;H04L7/10;H04L7/00 |
主分类号 |
H04B1/707 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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