Communication system using OFDM for one direction and DSSS for another direction

• US 8,873,516 B2
• Filed: 10/15/2010
• Issued: 10/28/2014
• Est. Priority Date: 03/09/2001
• Status: Expired due to Fees

• Current Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Original Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Inventors: Li, Xiaodong, Liu, Hui, Zhang, Wenzhong
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US12/905,884
• Publication Number:
  US 20110032921A1
• Time in Patent Office: 1,474 Days
• Field of Search: 370/335, 375/267
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A method and apparatus for wireless communication are described. In one embodiment, a method for communicating with a subscriber comprises transmitting orthogonal frequency domain multiplexing (OFDM) signals to the subscriber, and receiving direct-sequence spread spectrum (DSSS) signals from the subscriber.

Claims

1. A method comprising:

transmitting an orthogonal frequency division multiplexing (OFDM) signal of a plurality of OFDM signals in a downlink;

receiving a frequency hopping signal generated by a subscriber in an uplink, said received frequency hopping signal not comprising said plurality of OFDM signals; and

enabling use of an OFDM subcarrier cluster of said OFDM signal using said received frequency hopping signal, said OFDM subcarrier cluster containing at least two physical subcarriers of said OFDM signal.

2. The method of claim 1, wherein said OFDM subcarrier cluster contains consecutive subcarriers.

3. The method of claim 1, wherein said OFDM subcarrier cluster contains disjoint subcarriers.

4. The method of claim 1, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is fixed.

5. The method of claim 1, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is reconfigurable.

6. The method of claim 1, wherein said subscriber is part of a mobile communication system, said transmitting said OFDM signal being performed at a base station.

7. The method of claim 1, wherein said received frequency hopping signal comprises a code division multiple access (CDMA) signal.

8. The method of claim 7, wherein said CDMA signal is utilized in said uplink to avoid a large peak-to-average ratio problem associated with said plurality of OFDM signals.

9. The method of claim 7, further comprising:

transmitting a downlink CDMA signal in a downlink corresponding to said uplink of said received frequency hopping signal, said uplink of said received frequency hopping signal and said downlink corresponding to said uplink of said received frequency hopping signal comprising a bi-directional CDMA communication link.

10. The method of claim 9, wherein said OFDM signal comprises a uni-directional communication link.

11. The method of claim 1, wherein information extracted from said received frequency hopping signal is utilized for said enabling use of said OFDM subcarrier cluster.

12. The method of claim 1, wherein said OFDM subcarrier cluster is used by multiple subscribers.

13. A method comprising:

transmitting a frequency hopping signal generated by a subscriber in an uplink, said transmitted frequency hopping signal not comprising a plurality of orthogonal frequency division multiplexing (OFDM) signals;

receiving an OFDM signal of said plurality of OFDM signals in a downlink; and

enabling use of an OFDM subcarrier cluster of said OFDM signal using said transmitted frequency hopping signal, said OFDM subcarrier cluster containing at least two physical subcarriers of said OFDM signal.

14. The method of claim 13, wherein said OFDM subcarrier cluster contains consecutive subcarriers.

15. The method of claim 13, wherein said OFDM subcarrier cluster contains disjoint subcarriers.

16. The method of claim 13, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is fixed.

17. The method of claim 13, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is reconfigurable.

18. The method of claim 13, wherein said subscriber is part of a mobile communication system, said receiving said OFDM signal being performed at said subscriber.

19. The method of claim 13, wherein said transmitted frequency hopping signal comprises a code division multiple access (CDMA) signal.

20. The method of claim 19, wherein said CDMA signal is utilized in said uplink to avoid a large peak-to-average ratio problem associated with said plurality of OFDM signals.

21. The method of claim 19, further comprising:

receiving a downlink CDMA signal in a downlink corresponding to said uplink of said transmitted frequency hopping signal, said uplink of said transmitted frequency hopping signal and downlink corresponding to said uplink of said transmitted frequency hopping signal comprising a bi-directional CDMA communication link.

22. The method of claim 21, wherein said OFDM signal comprises a uni-directional communication link.

23. The method of claim 13, wherein information carried by said transmitted frequency hopping signal is utilized for said enabling use of said OFDM subcarrier cluster.

24. The method of claim 13, wherein said OFDM subcarrier cluster is used by multiple subscribers.

25. A system comprising:

a transmitter configured to transmit an orthogonal frequency division multiplexing (OFDM) signal of a plurality of OFDM signals in a downlink;

a receiver configured to receive a frequency hopping signal generated by a subscriber in an uplink, said frequency hopping signal received at said receiver not comprising said plurality of OFDM signals; and

circuitry configured to enable use of an OFDM subcarrier cluster of said OFDM signal using said frequency hopping signal, said OFDM subcarrier cluster containing at least two physical subcarriers of said OFDM signal.

26. The system of claim 25, wherein said OFDM subcarrier cluster contains consecutive subcarriers.

27. The system of claim 25, wherein said OFDM subcarrier cluster contains disjoint subcarriers.

28. The system of claim 25, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is fixed.

29. The system of claim 25, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is reconfigurable.

30. The system of claim 25, wherein said subscriber is part of a mobile communication system, said transmitter being at least a part of a base station.

31. The system of claim 25, wherein said frequency hopping signal comprises a code division multiple access (CDMA) signal.

32. The system of claim 31, wherein said transmitter is further configured to transmit a downlink CDMA signal in a downlink corresponding to said uplink of said receiver configured to receive said frequency hopping signal, said uplink of said receiver configured to receive said frequency hopping signal and said downlink corresponding to said uplink of said receiver configured to receive said frequency hopping signal comprising a bi-directional CDMA communication link.

33. The system of claim 32, wherein said OFDM signal comprises a uni-directional communication link.

34. The system of claim 25, wherein said circuitry is further configured to enable use of said OFDM subcarrier cluster utilizing information extracted from said frequency hopping signal.

35. A system comprising:

a transmitter configured to transmit a frequency hopping signal generated by a subscriber in an uplink, said frequency hopping signal transmitted by said transmitter not comprising a plurality of orthogonal frequency division multiplexing (OFDM) signals;

a receiver configured to receive an OFDM signal of said plurality of OFDM signals in a downlink; and

circuitry configured to enable use of an OFDM subcarrier cluster of said OFDM signal using said frequency hopping signal, said OFDM subcarrier cluster containing at least two physical subcarriers of said OFDM signal.

36. The system of claim 35, wherein said OFDM subcarrier cluster contains consecutive subcarriers.

37. The system of claim 35, wherein said OFDM subcarrier cluster contains disjoint subcarriers.

38. The system of claim 35, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is fixed.

39. The system of claim 35, wherein a mapping between said OFDM subcarrier cluster and a plurality of subcarriers thereof is reconfigurable.

40. The system of claim 35, wherein said subscriber is part of a mobile communication system, said receiver being located at said subscriber.

41. The system of claim 35, wherein said frequency hopping signal comprises a code division multiple access (CDMA) signal.

42. The system of claim 41, wherein said receiver is further configured to receive a downlink CDMA signal in a downlink corresponding to said uplink of said transmitter configured to transmit said frequency hopping signal, said uplink of said transmitter configured to transmit said frequency hopping signal and said downlink corresponding to said uplink of said transmitter configured to transmit said frequency hopping signal comprising a bi-directional CDMA communication link.

43. The system of claim 42, wherein said OFDM signal comprises a uni-directional communication link.

44. The system of claim 35, wherein information carried by said frequency hopping signal is utilized by said circuitry for said enabling use of said OFDM subcarrier cluster.