| US 7,512,149 B2 | ||
| Bit and power allocation scheme for full-duplex transmission with echo cancellation in multicarrier-based modems | ||
| James Basso, Englishtown, N.J. (US); Hamid R Sadjadpour, West Caldwell, N.J. (US); and Ranjan V Sonalkar, North Caldwell, N.J. (US) | ||
| Assigned to AT & T Intellectual Property II, L.P., Reno, Nev. (US) | ||
| Filed on Apr. 23, 2003, as Appl. No. 10/421,190. | ||
| Prior Publication US 2004/0213293 A1, Oct. 28, 2004 | ||
| Int. Cl. H04J 3/16 (2006.01); H04J 3/22 (2006.01); H04B 1/38 (2006.01); H04L 5/16 (2006.01) | ||
| U.S. Cl. 370—465 [375/222; 375/260] | 14 Claims |
| 1. A method of allocating bits to sub-carriers of data channel frequencies for spectrally efficient full-duplex transmission
between a central office (CO) and a remote terminal (RT), comprising the steps of:
measuring channel transfer functions from the CO to the RT, and from the RT to the CO, assuming a non-symmetric channel;
measuring a first noise background at the CO and a second noise background at the RT;
measuring a first effective echo cancellation at the CO and a second effective echo cancellation at the RT, including attenuation
effect of an analog hybrid circuit;
allocating bits successively to a plurality of sub-carriers for a data channel based on a minimal joint power consumption
at both the CO and RT, a joint power mask for each sub-carrier at both the CO and RT, a joint bit capacity of each sub-carrier
at both the CO and RT, and a predetermined data rate; and
ceasing allocation of bits when at least one of: a predetermined joint total power budget has been substantially exhausted,
joint power masks for the plurality of sub-carriers have been substantially exhausted, and the predetermined data rate has
been reached.
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