Multi-band single-carrier modulation

• US 7,830,995 B2
• Filed: 02/29/2008
• Issued: 11/09/2010
• Est. Priority Date: 07/18/2003
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Ojard, Eric J.
• Primary Examiner(s): Liu; Shuwang
• Assistant Examiner(s): HUANG, DAVID S
• Application Number:
  US12/039,765
• Publication Number:
  US 20090010367A1
• Time in Patent Office: 984 Days
• Field of Search: 375/346
• US Class Current: 375/346
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems

Abstract

Multi-band single-carrier modulation. A novel approach is presented by which interference compensation may be performed for signals received by a piconet operable device. The piconet operable device may be implemented within a region that includes two or more SOPs (Simultaneously Operating Piconets). Estimation of the level and location of interference is performed and the input to a decoder (within the piconet operable device) is selectively weighted to ensure that the effect of any existent interference within the signal received by the piconet operable device is minimized. Different interference levels are dealt with differently. For one example, portions of the received signal having undergone a large amount of interference may be simply treated as erasures with respect to the input the decoder. For another example, portions of the received signal having undergone some smaller degree of interference, but some interference nonetheless, may be de-weighted before being provided to the decoder.

Claims

1. An apparatus, comprising:

an interference estimation module implemented to;

detect whether or not a first symbol, included in a received signal, has collided with a second symbol; and

when it is detected that the first symbol has collided with the second symbol, the interference estimation module associates a level of interference with the first symbol; and

an interference level selective de-weighting module implemented to;

perform de-weighting of the first symbol when the level of interference is within a first range of interference and output the de-weighted first symbol;

treat an interference-affected bit of the first symbol as an erasure when the level of interference is within a second range of interference and output the first symbol that includes the erasure; and

output the first symbol when the interference estimation module fails to detect that the first symbol has collided with the second symbol.

2. The apparatus of claim 1, wherein:

the second range of interference is a relatively higher range of interference than the first range of interference.

3. The apparatus of claim 1, wherein:

the interference estimation module determines an energy of the first symbol and employs the determined energy of the first symbol to detect whether or not the first symbol has collided with the second symbol.

4. The apparatus of claim 1, wherein:

the interference estimation module determines an energy of the first symbol and employs the determined energy of the first symbol to detect whether or not the first symbol has collided with the second symbol; and

the interference estimation module compares the determined energy to at least one of a predetermined energy and a reference signal power estimate.

5. The apparatus of claim 1, wherein:

the first symbol is transmitted from a first piconet operable device that operates within a first piconet;

the second symbol is transmitted from a second piconet operable device that operates within a second piconet; and

the first piconet and the second piconet have a region of overlap.

6. The apparatus of claim 4, wherein:

symbols within the first piconet and the second piconet occur according to a structured interference pattern.

7. The apparatus of claim 1, further comprising:

a decoder implemented to receive the de-weighted first symbol, the first symbol that includes the erasure, or the first symbol; and

wherein;

the decoder processes the de-weighted first symbol, the first symbol that includes the erasure, or the first symbol to make an estimate of at least one bit encoded within the first symbol.

8. The apparatus of claim 1, wherein:

the de-weighting of the first symbol when the level of interference is within the first range of interference is performed using a first de-weighting factor; and

the interference level selective de-weighting module is implemented to perform de-weighting of the first symbol using a second de-weighting factor when the level of interference is within a third range of interference.

9. The apparatus of claim 1, wherein:

the interference estimation module is implemented to characterize interference associated with the first symbol as at least one of correlated interference, White-noise-like interference, structured interference, and orthogonal interference.

10. The apparatus of claim 1, wherein:

the apparatus is implemented as a baseband processor/MAC (Medium Access Controller) or a demodulator within a communication device.

11. The apparatus of claim 1, wherein:

the apparatus is a wireless communication device.

12. An apparatus, comprising:

an interference estimation module implemented to;

detect whether or not a first symbol, included in a received signal, has collided with a second symbol; and

when it is detected that the first symbol has collided with the second symbol, the interference estimation module associates a level of interference with the first symbol; and

an interference level selective de-weighting module implemented to;

perform de-weighting of the first symbol when the level of interference is within a first range of interference and output the de-weighted first symbol;

treat an interference-affected bit of the first symbol as an erasure when the level of interference is within a second range of interference and output the first symbol that includes the erasure; and

output the first symbol when the interference estimation module fails to detect that the first symbol has collided with the second symbol; and

wherein;

the second range of interference is a relatively higher range of interference than the first range of interference;

the de-weighting of the first symbol when the level of interference is within the first range of interference is performed using a first de-weighting factor; and

the interference level selective de-weighting module is implemented to perform de-weighting of the first symbol using a second de-weighting factor when the level of interference is within a third range of interference.

13. The apparatus of claim 12, wherein:

the interference estimation module determines an energy of the first symbol and employs the determined energy of the first symbol to detect whether or not the first symbol has collided with the second symbol.

14. The apparatus of claim 12, wherein:

the interference estimation module determines an energy of the first symbol and employs the determined energy of the first symbol to detect whether or not the first symbol has collided with the second symbol; and

the interference estimation module compares the determined energy to at least one of a predetermined energy and a reference signal power estimate.

15. The apparatus of claim 12, further comprising:

a decoder implemented to receive the de-weighted first symbol, the first symbol that includes the erasure, or the first symbol; and

wherein;

the decoder processes the de-weighted first symbol, the first symbol that includes the erasure, or the first symbol to make an estimate of at least one bit encoded within the first symbol.

16. The apparatus of claim 12, wherein:

the apparatus is implemented as a baseband processor/MAC (Medium Access Controller) or a demodulator within a communication device.

17. The apparatus of claim 12, wherein:

the apparatus is a wireless communication device.

18. A method, comprising:

detecting whether or not a first symbol, included in a received signal, has collided with a second symbol;

when it is detected that the first symbol has collided with the second symbol, associating a level of interference with the first symbol;

performing de-weighting of the first symbol when the level of interference is within a first range of interference using a first de-weighting factor and outputting the de-weighted first symbol;

treating an interference-affected bit of the first symbol as an erasure when the level of interference is within a second range of interference and outputting the first symbol that includes the erasure, wherein the second range of interference is a relatively higher range of interference than the first range of interference;

performing de-weighting of the first symbol when the level of interference is within a third range of interference using a second de-weighting factor and outputting the de-weighted first symbol;

outputting the first symbol when no collision between the first symbol and the second symbol is detected; and

decoding the de-weighted first symbol, the first symbol that includes the erasure, or the first symbol to make an estimate of at least one bit encoded within the first symbol.

19. The method of claim 18, further comprising:

determining an energy of the first symbol and employing the determined energy of the first symbol to detect whether or not the first symbol has collided with the second symbol; and

comparing the determined energy to at least one of a predetermined energy and a reference signal power estimate.

20. The method of claim 18, wherein:

the method is performed within a wireless communication device.