SYSTEM AND METHOD FOR HUFFMAN SHAPING IN A DATA COMMUNICATION SYSTEM

• US 20090141791A1
• Filed: 12/02/2008
• Published: 06/04/2009
• Est. Priority Date: 08/11/2000
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Carlson, Arthur J., Ungerboeck, Gottfried
• Granted Patent: US 7,697,606 B2
• Time in Patent Office: Days
• US Class Current: 375/240
• CPC Class Codes: H03M 7/40 Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
• CPC Class Codes: H04L 27/3405 Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power

Abstract

In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.

Claims

1. In a communication system, a method of communicating data comprising:

accepting data from a source of user data;

accumulating the data until a Huffman codeword is recognized;

mapping the Huffman codeword into a channel symbol; and

applying the channel symbol to an input of a channel.

2-24. -24. (canceled)