Apparatus and method for performing dithering in communication system using orthogonal frequency division multiplexing scheme

• US 20060119492A1
• Filed: 11/28/2005
• Published: 06/08/2006
• Est. Priority Date: 12/03/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Byung-Ki
• Granted Patent: US 7,307,563 B2
• Time in Patent Office: Days
• US Class Current: 341/143
• CPC Class Codes: H03M 1/0614 of harmonic distortion H03M1/0617 takes precedence
• CPC Class Codes: H03M 1/0641 the dither being a random signal
• CPC Class Codes: H03M 1/12 Analogue/digital converters H03M1/001 – H03M1/10 take precedence
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

Disclosed are an apparatus and a method for performing dithering in a communication system using an orthogonal frequency division multiplexing scheme. A method for adding dithering noise in a communication system employing an orthogonal frequency division multiplexing scheme includes receiving a signal, and generating dithering periodic noise and adding the dithering noise to the received signal.

Claims

1. A method for adding dithering noise in a communication system employing an orthogonal frequency division multiplexing scheme, the method comprising the steps of:

receiving a signal; and

generating periodic dithering noise and adding the dithering noise to the received signal.

2. The method as claimed in claim 1, wherein the periodic dithering noise in time domain is generated using at least some of sub-carriers employed as guard intervals in frequency domain.

3. The method as claimed in claim 1, wherein the periodic dithering noise is added to a received analog signal.

4. The method as claimed in claim 1, wherein the periodic dithering noise is added after a received analog signal is converted into a digital signal.

5. A method for adding dithering noise in a communication system which employs an orthogonal frequency division multiplexing scheme and converts a high-bit quantized signal into a low-bit quantized signal, the method comprising the steps of:

generating periodic dithering noise and adding the dithering noise to a signal obtained by sampling a received analog signal using a preset sampling frequency and quantizing the received signal in a high-bit quantization level;

performing a quantizing operation in a low-bit quantization level; and

performing a Fast Fourier Transform operation and a demodulation operation with respect to a low-bit quantized signal.

6. The method as claimed in claim 5, wherein the periodic dithering noise has frequency bands corresponding to an integer multiple of a value obtained by dividing the sampling frequency by the number of sub-carriers of the received signal.

7. The method as claimed in claim 6, wherein the periodic dithering noise in time domain is generated using at least some of sub-carriers employed as guard intervals in frequency domain.

8. An apparatus for performing dithering noises in a communication system which employs an orthogonal frequency division multiplexing scheme and converts a high-bit quantized signal into a low-bit quantized signal, comprising:

an analog-digital converter for sampling a received analog signal using a preset sampling frequency and quantizing the received signal in a high-bit quantization level;

a periodic dithering noise generator for generating periodic dithering noise and adding the dithering noise to a digitized signal;

a low-bit quantizer for performing a quantizing operation in a low-bit quantization level; and

a Fast Fourier Transform unit for performing a Fast Fourier Transform operation and then a demodulation operation with respect to a low-bit quantized signal.

9. The apparatus as claimed in claim 8, wherein the periodic dithering noise generator generates the periodic dithering noise corresponding to an integer multiple of a value obtained by dividing the sampling frequency by the number of sub-carriers of the received signal.

10. The apparatus as claimed in claim 9, wherein the periodic dithering noise in time domain is generated using at least some of sub-carriers employed as guard intervals in frequency domain.