Diversity detection for WCDMA

• US 6,804,311 B1
• Filed: 03/15/2000
• Issued: 10/12/2004
• Est. Priority Date: 04/08/1999
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Kinjo, Shigenori, Dabak, Anand G., Hosur, Srinath, Gatherer, Alan
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Kim, Kevin
• Application Number:
  US09/526,019
• Time in Patent Office: 1,672 Days
• Field of Search: 375/299, 375/347, 455/101, 455/103, 455/132
• US Class Current: 375/347
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals

Abstract

A circuit for detecting a transmit diversity signal comprises a first circuit (706) arranged to receive a first synchronization code. The first synchronization code is modulated by a data signal. The first circuit produces a first output signal. A second circuit (732) is arranged to receive a plurality of predetermined signals. The second circuit produces a channel estimate. A detection circuit (710, 712) is arranged to receive the first output signal and the channel estimate. The detection circuit produces a signal corresponding to the data signal.

Claims

1. A circuit for detecting a signal, comprising:

a first circuit arranged to receive a first synchronization code, the first synchronization code modulated by a data signal, the first synchronization circuit producing a first output signal;

a second circuit arranged to receive a plurality of predetermined signals, the second circuit producing a channel estimate; and

a detection circuit arranged to receive the first output signal and the channel estimate, the detection circuit producing a signal corresponding to the data signal.

2. A circuit as claim 1, further comprising a third circuit arranged to receive a second synchronization code modulated by the data signal, the second synchronization circuit producing a second output signal.

3. A circuit as claim 2, wherein the detection circuit is arranged to receive the second output signal.

4. A circuit as claim 1, wherein the data signal corresponds to transmit diversity of a base station.

5. A circuit as in claim 4, wherein the transmit diversity corresponds to transmission from a plurality of antennas.

6. A circuit as claim 1, wherein the first synchronization code is binary phase shift keyed (BPSK).

7. A circuit as in claim 1, wherein the first synchronization code is quadrature phase shift keyed (QPSK).

8. A circuit as claim 1, wherein the first synchronization code is received from a first base station and wherein the data signal corresponds to information about at least another base station.

9. A circuit as claim 1, wherein the first synchronization code is received from a base station and wherein the data signal corresponds to the base station transmit power.

10. A circuit as claim 1, wherein the first synchronization code is received from a base station and wherein the data signal corresponds to the base station system frame number.

11. A circuit as claim 1, wherein the data signal corresponds to a time offset of the secondary common control channel (SCCPCH) from a primary common control channel (PCCPCH).

12. A circuit as claim 1, wherein the data signal corresponds to broadcast information to a plurality of mobile receivers.

13. A circuit as claim 1, wherein the first synchronization code is transmitted from at least a first base station and a second base station in a same network.

14. A circuit as claim 1, wherein the first synchronization code is received from a first base station and wherein the first synchronization code is different from a corresponding first synchronization code of at least another base station in a same network.

15. A method of detecting a data signal comprising the steps of:

receiving a synchronization code modulated with the data signal;

receiving a sequence of symbols modulated by a code;

matching the code;

producing a channel estimate; and

detecting the data signal in response to the channel estimate.

16. A method as claim 15, wherein the data signal corresponds to transmit diversity of a base station.

17. A method as in claim 16, wherein the transmit diversity corresponds to transmission from a plurality of antennas.

18. A method as claim 15, wherein the synchronization code is received from a base station and wherein the data signal corresponds to information about at least another base station.

19. A method as in claim 18, wherein the information about at least another base station comprises a long code of said at least another base station.

20. A method as in claim 18, wherein the information about at least another base station comprises a code group of said at least another base station.

21. A method as claim 15, wherein the synchronization code is received from a base station and wherein the data signal corresponds to the base station transmit power.

22. A method as claim 15, wherein the synchronization code is received from a base station and wherein the data signal corresponds to the base station system frame number.

23. A method as claim 15, wherein the data signal corresponds to a time offset of the secondary common control channel (SCCPCH) from a primary common control channel (PCCPCH).

24. A method as claim 15, wherein the data signal corresponds to broadcast information to a plurality of mobile receivers.

25. A method as claim 15, wherein the synchronization code is transmitted from at least a first base station and a second base station in a same network.

26. A method as claim 15, wherein the synchronization code is received from a first base station and wherein the synchronization code is different from a corresponding synchronization code of at least another base station in a same network.

27. A method of transmitting a data signal comprising the steps of:

producing a synchronization code;

modulating the synchronization code with a data signal, thereby producing a modulated synchronization code; and

transmitting the modulated synchronization code.

28. A method as claim 27, wherein the data signal corresponds to transmit diversity of a base station.

29. A method as in claim 28, wherein the transmit diversity corresponds to transmission from a plurality of antennas.

30. A method as claim 27, wherein the synchronization code corresponds to a base station that performs the step of transmitting.

31. A method as in claim 30, wherein the data signal corresponds to information about at least another base station.

32. A method as in claim 31, wherein the information about at least another base station comprises a long code of said at least another base station.

33. A method as in claim 31, wherein the information about at least another base station comprises a code group of said at least another base station.

34. A method as claim 30, wherein the data signal corresponds to the base station transmit power.

35. A method as claim 30, wherein the data signal corresponds to the base station system frame number.

36. A method as claim 30, wherein the data signal corresponds to a time offset of the secondary common control channel (SCCPCH) from a primary common control channel (PCCPCH).

37. A method as claim 30, wherein the data signal corresponds to broadcast information to a plurality of mobile receivers.

38. A method as claim 27, further comprising the step of producing the synchronization code at another base station in a same network.

39. A method as claim 27, further comprising the step of producing another synchronization code at another base station in a same network that is different from the synchronization code.

40. A method of transmitting a signal from a base station comprising the steps of:

transmitting a first synchronization code from a first antenna at a first time; and

transmitting a second synchronization code from the first antenna at the first time, wherein at least one of the first and second synchronization codes is modulated by a data signal.

41. A method as in claim 40, further comprising the steps of:

transmitting the first synchronization code from a second antenna at the first time; and

transmitting the second synchronization code from the second antenna at the first time.

42. A method as claim 40, further comprising the step of transmitting the first synchronization code at another base station in a same network.

43. A method as claim 42, wherein the second synchronization code is different from a second synchronization code at said another base station.

44. A method as in claim 40, further comprising the steps of:

not transmitting the first synchronization code from the first antenna at a second time different from the first time;

not transmitting the second synchronization code from the first antenna at the second time;

transmitting the first synchronization code from a second antenna at a second time; and

transmitting the second synchronization code from the second antenna at the second time.

45. A method of transmitting a signal from a base station comprising the steps of:

transmitting a first synchronization code from a first antenna of the base station at a first time;

not transmitting a second synchronization code from a second antenna of the base station at the first time;

not transmitting the first synchronization code from the first antenna of the base station at a second time different from the first time;

transmitting a second synchronization code from the second antenna of the base station at the second time; and

wherein at least one of the first and second synchronization codes is modulated by a data signal.

46. A method as claim 45, further comprising the step of transmitting the first synchronization code at another base station in a same network.

47. A method as claim 45, wherein the second synchronization code is different from a second synchronization code at another base station in a same network.

48. A method of receiving a signal from a base station comprising the steps of:

receiving a first synchronization code from a first antenna at a first time; and

receiving a second synchronization code from the first antenna at the first time, wherein at least one of the first and second synchronization codes is modulated by a data signal.

49. A method as in claim 48, further comprising the steps of:

receiving the first synchronization code from a second antenna at the first time; and

receiving a second synchronization code from the second antenna at the first time.

50. A method as claim 48, further comprising the step of receiving the first synchronization code from a plurality of base stations in a same network.

51. A method as claim 48, wherein the second synchronization code is different from a second synchronization code of another base station in a same network.

52. A method as in claims 48, further comprising the steps of:

not receiving the first synchronization code from the first antenna at a second time different from the first time;

not receiving the second synchronization code from the first antenna at the second time;

receiving the first synchronization code from a second antenna at a second time; and

receiving the second synchronization code from the second antenna at the second time.

53. A method of receiving a signal from a base station comprising the steps of:

receiving a first synchronization code from a first antenna at a first time;

not receiving a second synchronization code from a second antenna at the first time;

not receiving the first synchronization code from the first antenna at a second time different from the first time;

receiving a second synchronization code from the second antenna at the second time; and

wherein at least one of the first and second synchronization codes is modulated by a data signal.

54. A method as claim 53, further comprising the step of receiving the first synchronization code from another base station in a same network.

55. A method as claims 53, wherein the second synchronization code is different from a second synchronization code at another base station in a same network.