Efficient transform-based quantization processing

• US 10,145,961 B1
• Filed: 04/27/2016
• Issued: 12/04/2018
• Est. Priority Date: 04/27/2016
• Status: Active Grant

• Current Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Stockmaster, Michael H., Dewulf, Thomas V.
• Primary Examiner(s): Nguyen, Chuong P
• Application Number:
  US15/140,268
• Time in Patent Office: 951 Days
• Field of Search: 34235777, 34235759, 34235763
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: G01S 19/24 Acquisition or tracking or demodulation of signals transmitted by the system synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073
• CPC Class Codes: G01S 19/37 Hardware or software details of the signal processing chain
• CPC Class Codes: G01S 5/0215 Interference

Abstract

Efficient transform-based quantization methods and quantization processors implementing such efficient transform-based quantization methods are disclosed. A transform-based quantization method may include: receiving an input signal transformed in a transform domain; producing a low-resolution signal by reducing a resolution of the input signal according to a reduction ratio; inversely transforming the low-resolution signal to produce an inversely transformed low-resolution signal; and quantizing the inversely transformed low-resolution signal to produce a quantized output.

Claims

1. An apparatus, comprising:

a resolution reducer configured to receive an input communication signal transformed in a transform domain, the resolution reducer further configured to produce an output signal by reducing a resolution of the input communication signal according to a reduction ratio;

an inverse transform processor configured to inversely transform the output signal to produce an inversely transformed resolution signal; and

a quantizer configured to quantize the inversely transformed resolution signal to produce a quantized output for receipt and processing by a communication device, the communication device being one of a satellite navigation receiver, a receiver with anti-jam functionality or a digital radio with beamforming capability.

2. The apparatus of claim 1, wherein the quantizer is configured to utilize a single quantization threshold to quantize the inversely transformed resolution signal having two quantum levels.

3. The apparatus of claim 1, wherein the quantizer is configured to utilize a plurality of quantization thresholds to quantize the inversely transformed resolution signal.

4. The apparatus of claim 3, wherein the quantizer is further configured to:

determine a gain adjustment value; and

provide the gain adjustment value to the resolution reducer.

5. The apparatus of claim 4, wherein the resolution reducer is further configured to normalize the output signal based on the gain adjustment value prior to providing the output signal with a normalized power to the inverse transform processor.

6. The apparatus of claim 5, wherein the quantizer is configured to utilize two quantization thresholds to quantize the inversely transformed resolution signal having three quantum levels.

7. The apparatus of claim 1, wherein the input communication signal has a first number of bits of resolution and the output signal has a second number of bits of resolution, and wherein the second number is reduced by at least a half compared to the first number.

8. An apparatus, comprising:

at least one processor configured to;

receive an input communication signal transformed in a transform domain;

produce an output signal by reducing a resolution of the input communication signal according to a reduction ratio;

inversely transform the output signal to produce an inversely transformed signal; and

quantize the inversely transformed resolution signal to produce a quantized output for receipt and processing by a communication device, the communication device being one of a satellite navigation receiver, a receiver with anti-jam functionality or a digital radio with beamforming capability.

9. The apparatus of claim 8, wherein the at least one processor is configured to utilize a single quantization threshold to quantize the inversely transformed resolution signal.

10. The apparatus of claim 8, wherein the at least one processor is configured to utilize a plurality of quantization thresholds to quantize the inversely transformed resolution signal.

11. The apparatus of claim 10, wherein the at least one processor is further configured to:

determine a gain adjustment value; and

normalize the output signal based on the gain adjustment value prior to inversely transforming the output signal.

12. The apparatus of claim 8, wherein the input communication signal has a first number of bits of resolution and the output signal has a second number of bits of resolution, and wherein the second number is reduced by at least a half compared to the first number.

13. A method, comprising:

receiving an input communication signal transformed in a transform domain;

producing an output signal by reducing a resolution of the input communication signal according to a reduction ratio;

inversely transforming the output signal to produce an inversely transformed resolution signal;

quantizing the inversely transformed resolution signal to produce a quantized output; and

providing the quantized output to a communication device, the communication device being one of a satellite navigation receiver, a receiver with anti-jam functionality or a digital radio with beamforming capability.

14. The method of claim 13, further comprising:

determining a gain adjustment value; and

normalizing the output signal based on the gain adjustment value prior to inversely transforming the output signal.

15. The method of claim 13, wherein the input communication signal has a first number of bits of resolution and the output signal has a second number of bits of resolution, and wherein the second number is reduced by at least a half compared to the first number.