Wireless communication encoding and decoding techniques using variable length codes

• US 20030141995A1
• Filed: 12/12/2002
• Published: 07/31/2003
• Est. Priority Date: 01/31/2002
• Status: Active Grant

• Current Assignee: Elan Microelectronics Corporation
• Original Assignee: Elan Microelectronics Corporation
• Inventors: Lin, Ki-Dar
• Granted Patent: US 6,734,812 B2
• Time in Patent Office: Days
• US Class Current: 341/52
• CPC Class Codes: H03M 5/08 Code representation by pulse width
• CPC Class Codes: H03M 7/40 Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code

Abstract

A wireless communication encoding and decoding technique using variable length codes is disclosed. The coding technique defines the transmission time for a high bit in a continuous bit stream as (N×T) expressed in terms of time unit (T), and a low bit as (M×T). By assigning different transmission times to represent high and low bits in continuous bit streams, the total data transmission time can be reduced considerably in handling large amounts of digital data as compared with conventional coding techniques. Other advantages using this coding technique include power saving by the data communication device, which may be a battery-powered peripheral device or mobile unit, and more reliable signal synchronization at both ends of the communication link.

Claims

1. A wireless communication encoding technique using variable length codes, comprising:

defining a transmission time unit in terms of (T);

defining a bit “

1”

using N time units to be (N×

T);

defining a bit “

0”

using M time units to be (M×

T);

wherein the values of M and N are not to be equal, and two adjacent data bits are represented by different voltages in output signal.

2. The wireless communication encoding technique using variable length codes as claimed in claim 1, wherein the time value N is to be greater than M.

3. The wireless communication encoding technique using variable length codes as claimed in claim 1, wherein the time value N is to be less than M.

4. A wireless communication decoding technique using variable length codes, comprising:

defining a basic time unit in terms of (T);

defining bit “

0”

using N time units to be (N×

T);

defining bit “

1”

using M time units to be (M×

T),

wherein the values of M and N are not to be equal.

5. The wireless communication decoding technique using variable length codes as claimed in claim 4, wherein the time value N is to be greater than M.

6. The wireless communication decoding technique using variable length codes as claimed in claim 4, wherein the time value N is to be less than M.