Method and apparatus for generating RF waveforms having aggregate energy with desired spectral characteristics

• US 8,228,968 B2
• Filed: 09/22/2008
• Issued: 07/24/2012
• Est. Priority Date: 10/17/2002
• Status: Expired due to Fees

• Current Assignee: TDC Acquisition Holdings, Inc (Humatics Corporation)
• Original Assignee: Alereon Incorporated (PNG Telecommunications, Inc.)
• Inventors: Fullerton, Larry W., Bradley, Arthur, Roberts, Mark D.
• Primary Examiner(s): Ahn, Sam K
• Application Number:
  US12/235,247
• Publication Number:
  US 20100277208A1
• Time in Patent Office: 1,401 Days
• Field of Search: 375/130, 375/135, 375/139, 375/146, 375/295
• US Class Current: 375/130
• CPC Class Codes: H03C 1/02 Details
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04B 1/7172 Pulse shape in general H04L25/03834
• CPC Class Codes: H04B 1/719 Interference-related aspects

Abstract

The present invention relates to a method and system that emulates a desired waveform by producing a time profile of the desired waveform, which is characterized by a plurality of sample values, and generating a plurality of RF waveforms, each RF waveform of the plurality of RF waveforms having a polarity and scaled energy based on a corresponding one of the plurality of sample values, to produce an aggregate RF energy having spectral characteristics that approximate the spectral characteristics of the desired waveform.

Claims

1. A method of emulating a desired waveform, comprising:

producing a time profile of said desired waveform characterized by a plurality of sample values; and

generating a plurality of RF (radio frequency) waveforms, each RF waveform of said plurality of RF waveforms having energy scaled relative to a reference value in accordance with a corresponding one of the plurality of sample values of said time profile, the reference value corresponding to a maximum sample value of the plurality of sample values, where the plurality of sample values are normalized against the maximum sample value.

2. The method of claim 1, wherein the plurality of RF waveforms have an aggregate RF energy approximating at least one spectral characteristic of the desired waveform.

3. The method of claim 2, further comprising:

filtering the aggregate RF energy within a frequency band.

4. The method of claim 2, wherein the at least one spectral characteristic is a frequency profile defined by a frequency, phase and amplitude parameters.

5. The method of claim 1, wherein a polarity of each of the plurality of generated RF waveforms corresponds to one of the plurality of sample values.

6. The method of claim 1, wherein the energy of each of the generated RF waveforms is scaled by at least one of patterning, making, regulating, setting, and estimating based on the corresponding one of the plurality of sample values.

7. The method of claim 1, wherein the sample values are generated by sampling the time profile based on a carrier frequency of the desired waveform.

8. The method of claim 1, wherein the plurality of generated waveforms are based on at least one spectral requirement of the desired waveform.

9. The method of claim 8, wherein the at least one spectral requirement is one of an energy level and a power distribution of a frequency spectrum.

10. A method of emulating a desired waveform, comprising:

producing a time profile of the desired waveform characterized by a plurality of sample values;

normalizing the plurality of sample values against a maximum sample value;

generating a corresponding RF (radio frequency) waveform to each of the plurality of sample values;

scaling relative to a reference value each of RF waveforms based on the corresponding sample value of the time profile, wherein the RF waveforms for the plurality of sample values have an aggregate RF energy of the desired waveform, wherein the reference value corresponds to the maximum sample value.

11. The method of claim 10, wherein the generating is based on a timing of the plurality of sample values.

12. The method of claim 10, wherein at least one of amplitude, width or type of each of the plurality of generated RF waveforms is based on the corresponding one of the plurality of sample values.

13. A transmitter, comprising:

a waveform generator configured to produce a time profile of a desired waveform, the desired waveform characterized by a plurality of sample values, and configured to generate a plurality of RF (radio frequency waveforms), each RF waveform of the plurality of RF waveforms having energy scaled in accordance with a corresponding one of the plurality of sample values of said time profile, wherein the plurality of sample values are normalized against a reference value.

14. The transmitter of claim 13, wherein the RF waveforms have an aggregate RF energy approximating at least one spectral characteristic of the desired waveform.

15. The transmitter of claim 14, wherein the waveform generator is further configured to filter the aggregate RF energy within a frequency band.

16. The transmitter of claim 14, wherein the at least one spectral characteristic is a frequency profile characterized by a frequency, phase and amplitude of the desired waveform.