Patent ID: 7512149
Filing Date: 2009-03-31
Classification: H04L

Abstract:
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.