IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0119546
(1993-09-13)
|
우선권정보 |
CH-0003040 (1992-09-29) |
발명자
/ 주소 |
- Bernhard Urs (Zrich CHX) Welti Arnold (Berikon CHX)
|
출원인 / 주소 |
- ASCOM Tech AG. (Bern CHX 03)
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인용정보 |
피인용 횟수 :
16 인용 특허 :
0 |
초록
▼
A synchronizing circuit comprises a controllable timer (9) and a PN-code generator (10) controllable thereby with at least three outputs (11.1, 11.2, 11.3), for the production of at least three PN-code signals phase-shifted with respect to one another. The PN-code signals phase-shifted with respect
A synchronizing circuit comprises a controllable timer (9) and a PN-code generator (10) controllable thereby with at least three outputs (11.1, 11.2, 11.3), for the production of at least three PN-code signals phase-shifted with respect to one another. The PN-code signals phase-shifted with respect to one another are correlated, in parallel correlation paths, with the received signal. Upon the presence of a time drift, the phase position of the trailing PN-code signal, for example, is changed so that this signal is now leading. Thereby, the control range is shifted. At the same time, reassignment is effected between the correlation path and the demodulating output in such a way that in all cases the correlation path that is in the middle with respect to time and that has the maximum correlation power is utilized for demodulation.
대표청구항
▼
A process for synchronizing a receiver switching circuit to a received signal containing a PN-code-spread data signal, comprising the steps of a) generating first, second and third PN-code signals shifted in time with respect to one another and controlling said PN-code signals by a controllable time
A process for synchronizing a receiver switching circuit to a received signal containing a PN-code-spread data signal, comprising the steps of a) generating first, second and third PN-code signals shifted in time with respect to one another and controlling said PN-code signals by a controllable timer, b) correlating said second PN-code signal, which is located intermediately with respect to time, in a second correlation path with the received signal for the purpose of data demodulation, c) correlating said first PN-code signal, which is leading in time, in a first correlation path with the received signal and correlating said third PN-code signal, which is trailing in time, in a third correlation path with the received signal for the purpose of controlling the timer, d) comparing a power of the correlated PN-code signals in said second correlation path with a power in said first and third correlation paths, respectively, e) adaptively shifting a control range, which is defined by the position in time of the leading and the trailing PN-code signals, when the power in the second correlation path is lower than in the first or third correlation paths, wherein, f) in case of the power in the second correlation path being lower than in the first correlation path-which indicates a time drift of the data signal in the forward direction-shifting the trailing PN-code signal by a predetermined time interval to a foremost location in time with respect to the remaining two PN-code signals, and g) reassigning the PN-code signals to the correlation paths, wherein said first PN-code signal, which is now located intermediately with respect to time, is correlated in the second correlation path with the received signal for the purpose of data demodulation, and said second PN-code signal, which is now trailing in time, is correlated in the third correlation path with the received signal, and said third PN-code signal, which is now leading in time, is correlated in the first correlation path with the received signal for the purpose of controlling the timer, h) in case of the power in the second correlation path being lower than in the third correlation path-which indicates a time drift of the data signal in the rearward direction-shifting the leading PN-code signal by a predetermined time interval to a rearmost location in time with respect to the remaining two PN-code signals, and i) reassigning the PN-code signals to the correlation paths, wherein said third PN-code signal, which is now located intermediately with respect to time, is correlated in the second correlation path with the received signal for the purpose of data demodulation, and said first PN-code signal, which is now trailing in time, is correlated in the third correlation path with the received signal, and said second PN-code signal, which is now leading in time, is correlated in the first correlation path with the received signal for the purpose of controlling the timer.
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