Fast initialization using seamless rate adaptation
A method for initializing modems in a multicarrier transmission system to establish a communication link between the transmitter and the receiver. An exemplary embodiment includes the steps of providing a predetermined parameter value that approximates a corresponding actual parameter value of the communication link, establishing a data communication link between a first transceiver and a second transceiver using the predetermined parameter value to allow the transmission of data, determining the actual parameter value, and seamlessly increasing the data rate of the established data communication link by using the determined actual parameter value to provide an steady state communication link with an updated data rate.
1. An initialization method for multicarrier communications, comprising:
performing, by a multicarrier transceiver, an initialization to establish a communication link with another multicarrier transceiver at a first data rate using a first bit allocation table and a plurality of predetermined parameter values, wherein the first bit allocation table is available at both the multicarrier transceiver and at the other multicarrier transceiver prior to the initialization, and wherein the first bit allocation table is from a previously completed initialization;
seamlessly adapting during the initialization, by the multicarrier transceiver, the first data rate of the communication link to a second data rate using a second bit allocation table to complete the initialization,
wherein the seamlessly adapting during the initialization includes iteratively updating an existing data rate to an updated data rate as an actual parameter value is obtained for each corresponding one of the predetermined parameter values, until the iteratively updating results in the second data rate being an optimized data rate that completes the initialization; and
transmitting or receiving, during the initialization, user data based on the first data rate.
2. The initialization method of claim 1 , wherein the seamlessly adapting is based on a sync symbol.
3. The initialization method of claim 1 , wherein the seamlessly adapting is based on a phase-shifted sync symbol.
4. The initialization method of claim 1 , wherein the seamlessly adapting includes keeping an interleaver depth and a frame size unchanged before and after transitioning from the existing data rate to the updated data rate.
5. The initialization method of claim 1 , further comprising transmitting a plurality of codewords during the seamlessly adapting.
6. The initialization method of claim 1 , further comprising receiving a plurality of codewords during the seamlessly adapting.
7. The initialization method of claim 1 , wherein the seamlessly adapting includes leaving interleaving parameters unchanged.
8. The initialization method of claim 1 , wherein the seamlessly adapting includes leaving forward error correction parameters unchanged.
9. The method of claim 1 , further comprising after the completion of the initialization, seamlessly adapting the second data rate to at least a third data rate.
10. The method of claim 1 wherein a time period of the initialization, in which transmission of the user data is precluded, is 1 second or less.
11. An initialization method for multicarrier communications, comprising:
performing an initialization to establish a communication link between a first multicarrier transceiver and a second multicarrier transceiver at a first data rate using a first bit allocation table and a plurality of predetermined parameter values, wherein the first bit allocation table is available at both the first multicarrier transceiver and at the second multicarrier transceiver prior to the initialization;
seamlessly adapting, during the initialization, the first data rate of the communication link to a second data rate using a second bit allocation table to complete the initialization,
wherein the seamlessly adapting during the initialization includes iteratively updating an existing data rate to an updated data rate as an actual parameter value is obtained for each corresponding one of the predetermined parameter values, until the iteratively updating results in the second data rate being an optimized data rate that completes the initialization; and
transmitting or receiving, during the initialization, user data based on the first data rate.
12. The initialization method of claim 11 , wherein the seamlessly adapting is based on a sync symbol.
13. The initialization method of claim 11 , wherein the seamlessly adapting is based on a phase-shifted sync symbol.
14. The initialization method of claim 11 , wherein the seamlessly adapting includes keeping an interleaver depth and a frame size unchanged before and after transitioning from the existing data rate to the updated data rate.
15. The initialization method of claim 11 , further comprising transmitting a plurality of codewords during the seamlessly adapting.
16. The initialization method of claim 11 , further comprising receiving a plurality of codewords during the seamlessly adapting.
17. The initialization method of claim 11 , wherein the seamlessly adapting includes leaving interleaving parameters unchanged.
18. The initialization method of claim 11 , wherein the seamlessly adapting includes leaving forward error correction parameters unchanged.
19. The method of claim 11 , further comprising after the completion of the initialization, seamlessly adapting the second data rate to at least a third data rate.
20. The method of claim 11 wherein a time period of the initialization, in which transmission or reception of the user data is precluded, is 1 second or less.