SATELLITE SIGNAL ADAPTIVE TIME-DIVISION MULTIPLEXING RECEIVING DEVICE

• US 20080013518A1
• Filed: 07/09/2007
• Published: 01/17/2008
• Est. Priority Date: 04/19/2006
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Chen, Chun-nan
• Granted Patent: US 7,916,075 B2
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: G01S 19/24 Acquisition or tracking or demodulation of signals transmitted by the system synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/30 code related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: G01S 19/37 Hardware or software details of the signal processing chain
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 2001/70706 using a code tracking loop, e.g. a delay locked loop
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects

Abstract

A satellite signal adaptive time-division multiplexing receiving device is disclosed. The receiving device operates in time-division multiplexing distributed for various domains such as satellite number, Doppler frequency, code phase and accuracy. When some specific time slots of the time-division multiplexing distribution are unnecessary to be searched, the receiving device uses a disable signal to deactivate specific components such as correlator and memory thereof during those time slots to reduce power consumption.

Claims

1. A satellite signal adaptive time-division multiplexing receiving device comprising:

a corrlelator executing correlation to an input signal in time-division multiplexing; and

a receiver controller outputting a disable signal to deactivate at least one predetermined component of the receiving device during designated time-division multiplexing time slots.

2. The device of claim 1, wherein distribution of the time-division multiplexing is adjustable.

3. The device of claim 1, further comprising a clock controller providing a clock signal with a clock rate, wherein the corrlelator executes correlation at a speed determined by the clock rate.

5. The device of claim 3, wherein the clock rate is fixed.

6. The device of claim 3, wherein the clock rate is variable.

7. The device of claim 6, wherein the clock rate is changed when operation mode of the receiving device is changed.

8. The device of claim 3, wherein the disable signal is transmitted to the clock controller to deactivate a clock for the correlator during the designated time-division multiplexing time slots.

9. The device of claim 1, wherein the disable signal is transmitted to the correlator to deactivate communication logic of the correlator during the designated time-division multiplexing time slots.

10. The device of claim 1, further comprising a memory for storing integration result of the correlator, and wherein the disable signal is transmitted to the memory to turn a chip-enable signal of the memory off during the designated time-division multiplexing time slots.

11. The device of claim 1, wherein the disable signal is generated in consideration of satellite number to be tried.

12. The device of claim 1, wherein the disable signal is generated in consideration of Doppler frequency beams to be tried.

13. The device of claim 1, wherein the disable signal is generated in consideration of code phases to be tried.

14. The device of claim 1, wherein the disable signal is generated in consideration of accuracy determined by chip code spacing.

15. The device of claim 1, wherein the receiver controller has a disable signal generator for generating the disable signal, said the disable signal generator comprises a plurality of counters, each of which is in charge of one domain so that a signal is generated for the corresponding domain, and a combiner for combine the signals for respective domains to output a resultant disable signal.

16. The device of claim 1, wherein distribution of the time-division multiplexing is arranged depending on code phase range to be searched.

17. The device of claim 1, wherein distribution of time-division multiplexing is arranged depending on Doppler frequency range to be searched.

18. The device of claim 1, wherein distribution of time-division multiplexing is arranged depending on satellite number to be searched.

19. The device of claim 1, wherein distribution of time-division multiplexing is arranged depending on tracking accuracy.