Method and apparatus for a RADSL transceiver warm start activation procedure with precoding
AssigneeGlobespan Semiconductor, Inc.
InventorsEhud Langberg, William Scholtz, Farooq Jabbar
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Abstract
A DSL communication device wherein the state of component coefficients are saved in a memory of a DSL device so that at a later time, the DSL device may initiate a warm start activation sequence wherein the last known channel parameters are used to train the equalizer, significantly reducing the amount of equalizer training required by eliminating the requirement that the aforementioned coefficients be transferred between DSL devices.
Claims15
A method for providing a shortened warm-start training sequence for a transceiver that is communicating data with another transceiver, comprising the steps of:
- processing a request to enter a standby mode,
- saving the state of a precoder at a transmitter;
- saving the state of an equalizer at a receiver;
- receiving a request to exit the standby mode and resume data transmission;
- restoring the saved precoder state to the precoder;
- restoring the saved equalizer state to the equalizer;
- performing a shortened training sequence to ascertain the correct phase of a communication channel;
- and
- adjusting the equalizer accordingly.
A transceiver apparatus having a transmitter including a precoder and a receiver including an equalizer, the apparatus comprising:
- means for saving the state of the precoder after training;
- means for saving the state of the equalizer after training;
- and
- means for performing a warm start activation sequence, including means for restoring the state of said precoder and said equalizer.
A computer readable medium having a program for providing a shortened warm-start training sequence for a transceiver that is communicating data with another transceiver, the program comprising:
- means for processing a request to enter a standby mode;
- means for saving the state of a precoder at a transmitter;
- means for saving the state of an equalizer at a receiver;
- means for receiving a request to exit the standby mode and resume data transmission;
- means for restoring the saved precoder state to the precoder;
- means for restoring the saved equalizer state to the equalizer;
- means for performing a shortened training sequence to ascertain the correct phase of a communication channel;
- and
- means for adjusting the equalizer accordingly.
Dependencies are inferred from the claim text.