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

• US 7,307,563 B2
• Filed: 11/28/2005
• Issued: 12/11/2007
• 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
• Primary Examiner(s): Mai, Lam T.
• Application Number:
  US11/287,945
• Publication Number:
  US 20060119492A1
• Time in Patent Office: 743 Days
• Field of Search: 341121-155
• US Class Current: 341/131
• 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,

wherein the periodic dithering noise is generated using at least some of sub-carriers employed as guard intervals in time domain.

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

3. 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.

4. 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 the low-bit quantized signal.

5. The method as claimed in claim 4, 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.

6. The method as claimed in claim 5, wherein the periodic dithering noise in time domain is generated using at least some of sub-carriers employed as guard intervals in frequency domain.

7. 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 the low-bit quantized signal.

8. The apparatus as claimed in claim 7, 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.

9. The apparatus as claimed in claim 8, wherein the periodic dithering noise in time domain is generated using at least some of sub-carriers employed as guard intervals in frequency domain.