Bipolar modulator

• US 20050136858A1
• Filed: 12/23/2003
• Published: 06/23/2005
• Est. Priority Date: 12/23/2003
• Status: Abandoned Application

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Zipper, Eliav
• Application Number:
  US10/742,893
• Publication Number:
  US 20050136858A1
• Time in Patent Office: Days
• US Class Current: 455/102
• CPC Class Codes: H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal H03C7/00 takes precedence

Abstract

Embodiments of the invention describe a transmitter to synthesize an output signal by combining a bi-polar base band amplitude signal with a phase-modulated signal. The bi-polar base band amplitude may have either positive or negative values depending on at least one predetermined criterion related to an input signal of the transmitter.

Claims

1. An apparatus comprising:

a transmitter able to control a sign of a bi-polar base band amplitude signal based on at least one predetermined criterion related to an input signal of the transmitter.

2. An apparatus according to claim 1 wherein

said transmitter is able to generate an output signal by combining said bi-polar base band amplitude signal with a phase modulated signal.

3. An apparatus according to claim 2 wherein said transmitter comprises:

a base-band processor able to provide said bi-polar base band signal.

4. An apparatus according to claim 3, wherein said base band processor is able to determine whether said input signal approaches a zero-crossing, and to invert the sign of said bi-polar amplitude signal if said input signal approaches a zero-crossing.

5. An apparatus according to claim 4 wherein said base band processor is able to determine whether said input signal is within a domain proximal to the origin of a predefined complex plane.

6. An apparatus according to claim 5 wherein said base band processor is able to determine whether a distance between a value related to said input signal is closer to said origin than a predetermined fraction of a maximal signal amplitude.

7. An apparatus according to claim 3 wherein said transmitter further comprises:

a modulator operably coupled to said base band processor to generate said phase modulated signal.

8. An apparatus according to claim 2 wherein said transmitter further comprises:

a mixer to combine said bi-polar base-band signal with said phase modulated signal.

9. The apparatus of claim 8 wherein said transmitter further comprises:

a power amplifier operably coupled to the output of said mixer to amplify said combined signal.

10. A method comprising:

controlling a sign of a bi-polar base band amplitude signal based on at least one predetermined criterion related to a transmission input signal.

11. The method of claim 10 further comprising

generating an output signal by combining said bi-polar base-band amplitude signal with a phase modulated signal.

12. The method according to claim 10, wherein controlling a sign comprises:

determining whether said input signal approaches a zero-crossing; and

inverting the sign of said bi-polar amplitude signal if said input signal approaches a zero-crossing.

13. The method according to claim 12 wherein determining whether said input signal approaches a zero-crossing comprises:

determining whether said input signal is within a domain proximal to the origin of a predefined complex plane.

14. The method according to claim 13 wherein determining whether said input signal is within a domain proximal to the origin of a predefined complex plane comprises:

determining whether a distance between a value related to said input signal is closer to said origin than a predetermined fraction of a maximal signal amplitude.

15. A wireless communication device comprising:

a transmitter able to control a sign of a bi-polar base band amplitude signal based on at least one predetermined criterion, to generate an output signal;

an internal antenna to transmit said output signal.

16. A wireless communication device according to claim 15 wherein said transmitter is able to generate said output signal by combining said bi-polar base band amplitude signal with a phase modulated signal.

17. A wireless communication device according to claim 15, wherein said transmitter comprises:

a base-band processor able to provide said bi-polar base band amplitude signal.

18. A wireless communication device according to claim 17, wherein said base band processor is able to determine whether said input signal approaches a zero-crossing, and to invert the sign of said bi-polar amplitude signal if said input signal approaches a zero-crossing.

19. A wireless communication device according to claim 18 wherein said base band processor is able to determine whether said input signal is within a domain proximal to the origin of a predefined complex plane.

20. A wireless communication device according to claim 19 wherein said base band processor is able to determine whether a distance between a value related to said input signal is closer to said origin than a predetermined fraction of a maximal signal amplitude.

21. A wireless communication device according to claim 16 wherein said transmitter further comprises:

a mixer to combine said bi-polar signal with said phase modulated signal.

22. A wireless communication system comprising:

at least two communication stations wherein at least one communication station of the at least two communication stations comprises a transmitter able to control a sign of a bi-polar base band amplitude signal based on at least one predetermined criterion, to generate an output signal.

23. A wireless communication system according to claim 22 wherein said transmitter is able to generate said output signal by combining said bi-polar base band amplitude signal with a phase modulated signal.

24. A wireless communication system according to claim 22 wherein said transmitter comprises:

a base-band processor to provide said bi-polar base band amplitude signal.

25. A wireless communication system according to claim 23 wherein said transmitter further comprises:

a mixer to combine said bi-polar signal with said phase modulated signal;

26. An article comprising:

a storage medium, having stored thereon instructions that, when executed by a computing platform, result in;

controlling a sign of a bi-polar base band amplitude signal based on at least one predetermined criterion related to a transmission input signal.

27. The article of claim 26, wherein the instructions further result in:

generating an output signal by combining said bi-polar base-band amplitude signal with a phase modulated signal.

28. The article of claim 26, wherein the instructions that result in controlling a sign, result in:

determining whether said input signal approaches a zero-crossing; and

inverting the sign of said bi-polar amplitude signal if said input signal approaches a zero-crossing.

29. The article of claim 28, wherein the instructions that result in determining whether said input signal approaches a zero-crossing result in:

determining whether said input signal is within a domain proximal to the origin of a predefined complex plane.

30. The article of claim 29, wherein the instructions that result in determining whether said input signal is within a domain proximal to the origin of a predefined complex plane, result in:

determining whether a distance between a value related to said input signal is closer to said origin than a predetermined fraction of a maximal signal amplitude.