Granted Patent B2

US 7,856,033 · App. 11/598,993 · Granted Dec 21, 2010

Abstract

Claims (59)

1. A method for transitioning from an initial data rate to a new data rate in a multi-carrier communication system, comprising:

determining whether a first communication parameter has priority over a second communication parameter or whether the second communication parameter has priority over the first communication parameter;

using an initial bit loading parameter Lp and an initial interleaver depth Dp to transmit a series of symbols at the initial data rate from a transmitter to a receiver;

determining that the new data rate is desired between the transmitter and receiver;

if the first communication parameter has priority over the second communication parameter, then calculating a modified bit loading parameter Lp′ according to a first function;

if the second communication parameter has priority over the first communication parameter, then calculating the modified bit loading parameter Lp′ according to a second function that differs from the first function; and

using the modified bit loading parameter to transmit data from the transmitter to the receiver at the new data rate;

wherein the modified bit loading parameter Lp′ is calculated based on the initial bit loading parameter Lp.

2. The method of claim 1 , wherein using the modified bit loading parameter to transmit data from the transmitter to the receiver at the new data rate comprises:

transmitting a time marker from the transmitter to the receiver;

concurrently changing from the initial bit loading parameter to the modified bit loading parameter at the time marker in both the transmitter and receiver.

3. The method of claim 2 , wherein the time marker corresponds to a symbol boundary between first and second symbols.

4. The method of claim 3 , wherein the first and second symbols include a series of bytes that correspond to at least one forward error correction codeword made up of a number of codeword bytes.

5. The method of claim 4 , further comprising changing from the initial interleaver depth Dp to a modified interleaver depth Dp′ at a codeword byte that is offset from the symbol boundary.

6. A method for transitioning from an initial data rate to a new data rate in a multi-carrier communication system, comprising:

determining whether a first communication parameter has priority over a second communication parameter or whether the second communication parameter has priority over the first communication parameter;

using an initial bit loading parameter Lp and an initial interleaver depth Dp to transmit a series of symbols at the initial data rate from a transmitter to a receiver;

determining that the new data rate is desired between the transmitter and receiver;

if the first communication parameter has priority over the second communication parameter, then calculating a modified bit loading parameter Lp′ according to a first function;

if the second communication parameter has priority over the first communication parameter, then calculating the modified bit loading parameter Lp′ according to a second function that differs from the first function; and

using the modified bit loading parameter to transmit data from the transmitter to the receiver at the new data rate;

where the first function is represented by the following relationship:

Lp

′

=

floor

⁡

(

Lp

×

Dp

′

-

1

Dp

-

1

)

wherein Dp′ is a modified interleaver depth.

7. A method for transitioning from an initial data rate to a new data rate in a multi-carrier communication system, comprising:

determining whether a first communication parameter has priority over a second communication parameter or whether the second communication parameter has priority over the first communication parameter;

using an initial bit loading parameter Lp and an initial interleaver depth Dp to transmit a series of symbols at the initial data rate from a transmitter to a receiver;

determining that the new data rate is desired between the transmitter and receiver;

if the first communication parameter has priority over the second communication parameter, then calculating a modified bit loading parameter Lp′ according to a first function;

if the second communication parameter has priority over the first communication parameter, then calculating the modified bit loading parameter Lp′ according to a second function that differs from the first function; and using the modified bit loading parameter to transmit data from the transmitter to the receiver at the new data rate;

where the second function is represented by the following relationship:

Lp

′

=

floor

⁡

(

Lp

×

Dp

′

Dp

)

wherein Dp′ is a modified interleaver depth.

Assignments (6)