Patent ID: 7194024

Claim:
A method of adaptive hybrid selection during modem training, the method comprising: determining a set of N representative test loops; defining a first parametric cost function directly coupled to channel capacity as J = A * ∑ i ⁢ ɛ ⁢ S ⁢ ⁢ log 2 ⁡ ( nf_quiet ⁢ ( i ) ) + B * f ⁡ ( nf_echo ) , where A and B are empirical constants that are derived based on performance of each hybrid over the set of representative test loops, nf_quiet(i) is the estimated quiet noise floor over the receive band for tone index-i with no transmit signal nf_echo is the sum of the echo signal power over the transmit band, and the set S for summation of the nf_quiet noise floor is a part of the receive band; evaluating a cost function ‘J’ for each hybrid in terms of the cost function parameters for each hybrid in response to estimated noise floors associated with each hybrid for each representative test loop; and selecting the hybrid that results in minimum ‘J’, said selected hybrid to be used by the modem.