Method and device for managing power consumption of a receiver in stand-by mode

• US 6,751,451 B2
• Filed: 03/19/2002
• Issued: 06/15/2004
• Est. Priority Date: 04/02/1999
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Perets, Yona, Rainish, Doron, Shamai, Shlomo
• Primary Examiner(s): APPIAH, CHARLES NANA
• Application Number:
  US10/100,190
• Publication Number:
  US 20020155866A1
• Time in Patent Office: 819 Days
• Field of Search: 455/343.1, 455/574, 455/422, 455/517, 455/68, 455/62, 455/573, 375/224, 375/225, 340/7.35, 370/311, 370/337
• US Class Current: 455/343.1
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Some embodiments of the present invention are directed to a device having a soft decoder to produce a codeword by soft decoding one or more repetitions of a word received by a receiver and a power reducer to reduce power to the receiver when a message contained in the codeword is not addressed to the receiver.

Claims

1. A device comprising:

a soft decoder to produce a codeword by soft decoding one or more repetitions of a word received by a receiver, the soft decoder including,

a candidate generator, to generate one or more candidates based, at least in part, on said one or more repetitions, and

a selector, responsive to the candidate generator, to select a best candidate from said one or more candidates as said codeword; and

a power reducer, to reduce power to said receiver when a message contained in said codeword is not addressed to said receiver.

2. The device of claim 1, wherein said candidate generator comprises:

a locator to identify locations of one or more low confidence bits in said one or more repetitions;

a test pattern generator to generate two or more test patterns based upon said one or more repetitions and said pattern templates; and

an algebraic decoder to decode one or more of said test patterns to produce said candidates.

3. The device of claim 1, wherein said selector comprises a correlation metric calculator to calculate a correlation metric, and said best candidate is a candidate which minimizes said correlation metric.

4. The device of claim 1 further comprising:

a determiner to determine the probable reliability of said codeword.

5. The device of claim 4, wherein said determiner comprises:

an estimator to produce an average bit level estimate and a signal to noise ratio estimate for said one or more repetitions;

a calculator to calculate a probability associated with said codeword, based upon said estimates; and

a decision block to decide the reliability of said codeword based upon said probability.

6. The device of claim 1, wherein said receiver is part of a mobile telephone, local loop, a pager or a cordless telephone.

7. A method comprising:

soft decoding one or more repetitions of a word received by a receiver to produce a codeword, the soft decoding including;

generating one or more candidates based upon said one or more repetitions, and

selecting a best candidate from said one or more candidates as said codeword; and

reducing power to said receiver when a message contained in said codeword is not addressed to said receiver.

8. The method of claim 7, wherein selecting said best candidate comprises:

calculating a correlation metric for each candidate; and

choosing the candidate which minimizes said calculated correlation metric as said best candidate.

9. The method of claim 7 further comprising:

determining the probable reliability of said codeword.

10. The method of claim 9, wherein determining said probable reliability comprises:

determining said probable reliability based on soft decision variables associated with bits of said received repetitions.

11. The method of claim 9, wherein determining said probable reliability comprises:

determining said probable reliability based on an a posteriori probability (APP) for said best candidate.

12. The method of claim 7, further comprising:

combining one of said repetitions with previous repetitions of said word to form a combination; and

generating one or more candidates from information contained in said combination.

13. The method of claim 12, wherein combining one of said repetitions with previous repetitions comprises:

multiplying bits of all said repetitions by weight factors to produce products; and

accumulating said products.

14. The method of claim 13, wherein said weight factors are based upon received signal strength indicator (RSSI) information for identification of low confidence bits.

15. The method of claim 12, wherein generating said candidates comprises:

identifying locations of one or more low confidence bits of said combination;

generating two or more pattern templates based upon said locations;

generating two or more test patterns based upon said combination and said pattern templates; and

decoding one or more of said test patterns.

16. The method of claim 15, wherein identifying said locations of one or more low confidence bits comprises:

identifying said locations of one or more low confidence bits by using soft decision variables associated with bits of said received repetitions.

17. The method of claim 15, wherein identifying said locations of one or more low confidence bits comprises:

identifying said locations of one or more low confidence bits by using received signal strength indicator (RSSI) information.

18. The method of claim 7, wherein said method further comprises:

restoring power to said receiver when a timer reaches a predetermined time, independent of at what time reducing said power occurred.

19. A cellular telephone system comprising:

a mobile station comprising;

a receiver to receive repetitions of a word containing a message possibly addressed to said mobile station;

a soft decoder to produce a codeword by soft decoding one or more of said repetitions, said soft decoder including;

a candidate generator, to generate one or more candidates based, at least in part, on said one or more repetitions, and

a selector, responsive to the candidate generator, to select a best candidate from said one or more candidates as said codeword; and

a power reducer to reduce power to said receiver when said message contained in said codeword is not addressed to the mobile station; and

one or more dipole antenna(e), coupled to the receiver of the mobile station, through which communication between the mobile station and a base station is achieved.

20. The system of claim 19,

a base station, communicatively coupled to the mobile station through a wireless communication channel, wherein the base station provides coverage for a geographical cell of between approximately 3 and 24 square kilometers.

21. The system of claim 19, wherein said candidate generator comprises:

a locator to identify locations of one or more low confidence bits in said one or more repetitions;

a pattern template generator to generate two or more pattern templates based upon said locations; and

an algebraic decoder to decode one or more of said test patterns to produce said candidates.

22. The system of claim 19, wherein said selector comprises a correlation metric calculator to calculate a correlation metric, and said best candidate is a candidate which minimizes said correlation metric.