Processing differentiated hierarchical modulation used in radio frequency communications

• US 8,005,160 B2
• Filed: 11/26/2007
• Issued: 08/23/2011
• Est. Priority Date: 12/30/2006
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Steer, David G., Dodd, Curt, Jia, Ming
• Primary Examiner(s): Wang, Ted M
• Application Number:
  US11/945,162
• Publication Number:
  US 20080159430A1
• Time in Patent Office: 1,366 Days
• Field of Search: 375/340, 375/267, 375/295, 375/297, 375/260, 375/299, 370/334, 455/101
• US Class Current: 375/267
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 27/3483 using a modulation of the constellation points
• CPC Class Codes: H04L 27/3488 Multiresolution systems

Abstract

The present invention employs hierarchical modulation to simultaneously transmit data over different modulation layers using a carrier RF signal. Each modulation layer may be of a higher or lower order than the other modulation layers. Certain embodiments of the present invention may transmit different information on the different modulation layers. Other embodiments of the present invention may use the different layers for processing information differently.

Claims

1. A method for transmitting information from a first of at least one base station comprising:

transmitting first data using a first modulation layer of a first carrier radio frequency (RF) signal during a first time period; and

initiating transmission of second data using a second modulation layer of the first carrier RF signal during the first time period,

wherein the first and second modulation layers are hierarchical modulation layers of the first carrier RF signal, and the first and second data are processed differently.

2. The method of claim 1 further comprising alternating between transmitting using a single modulation layer and transmitting using both the first and second modulation layers.

3. The method of claim 1 wherein the at least one base station has a plurality of antennas forming a single frequency network (SFN).

4. The method of claim 1 wherein the first of the at least one base station has a first antenna and a second antenna, wherein the first data is transmitted using the first and second antennas, and the second data is transmitted using only the first antenna.

5. The method of claim 4 wherein the first data comprises at least one program channel for a basic program service and the second data comprises at least one program channel for a supplemental program service.

6. The method of claim 4 wherein the first data comprises single-input single-output (SISO) data and the second data comprises multiple-input multiple-output (MIMO) data.

7. The method of claim 4 wherein the first of the at least one base station further comprises transmitting third data using only the second antenna.

8. The method of claim 4 further comprising a method for transmitting information from a second of at the least one base station comprising:

transmitting third data using a third modulation layer of a second carrier radio frequency (RF) signal during a second time period; and

initiating transmission of fourth data using a fourth modulation layer of the second carrier RF signal during the second time period,

wherein the third and fourth modulation layers are hierarchical modulation layers of the second carrier RF signal, and the third and fourth data are processed differently.

9. The method of claim 1 wherein at least one of the first data and the second data comprises time multiplexed data.

10. The method of claim 1 wherein at least one of the first data and the second data is modulated onto a plurality of sub-carriers using orthogonal frequency division multiplexing (OFDM).

11. The method of claim 1 wherein at least one of the first data and the second data is modulated onto a plurality of sub-carriers using single-carrier frequency division multiplexing (SC-FDM).

12. The method of claim 1 wherein the first of the at least one base station has a first antenna and a second antenna, wherein the first data is transmitted using the first and second antennas, and the second data comprises third data and fourth data such that the third data is transmitted using only the first antenna and the fourth data is transmitted using only the second antenna.

13. The method of claim 1 wherein at least one of the first data and the second data is transmitted to user equipment (UE).

14. The method of claim 1 wherein the second data is transmitted to at least one relay station.

15. The method of claim 14 wherein the second data comprises synchronization information.

16. The method of claim 14 wherein a first of the at least one relay station is adapted to receive the second data at the second modulation layer and transmit the second data to at least one of a group consisting of at least one other of the at least one relay station, user equipment, and the at least one base station.

17. The method of claim 1 further comprising a method for transmitting information from a second of at the least one base station comprising:

transmitting the first data using a third modulation layer of a second carrier radio frequency (RF) signal during a second time period; and

initiating transmission of third data using a fourth modulation layer of the second carrier RF signal during the second time period,

wherein the third and fourth modulation layers are hierarchical modulation layers of the second carrier RF signal.

18. The method of claim 1 wherein the first data comprises data unrelated to the second data.

19. The method of claim 1 wherein the first data comprises a different type of media content than the second data.

20. The method of claim 1 wherein the first carrier RF signal comprises a plurality of modulation symbols, such that each of certain of the plurality of modulation symbols comprises first order bits that provide the first data and second order bits that provide the second data.

21. The method of claim 1 wherein the second modulation layer is time-shifted from the first modulation layer.

22. The method of claim 21 wherein a modulation rate of the first modulation layer is less than a modulation rate of the second modulation layer.

23. A radio frequency (RF) communications system comprising:

at least one communication interface; and

a control system associated with the at least one communication interface and adapted to;

transmit first data using a first modulation layer of a first carrier RF signal during a first time period; and

initiate transmission of second data using a second modulation layer of the first carrier RF signal during the first time period,

wherein the first and second modulation layers are hierarchical modulation layers of the first carrier RF signal, and the first and second data are processed differently.

24. The RF communications system of claim 23 further comprising user equipment (UE) adapted to receive the first carrier RF signal.

25. The RF communications system of claim 23 further comprising at least one relay station adapted to receive the first carrier RF signal.