Patent ID: 8009749

Claim:
A method of transmission power control, the method comprising: a) applying an optimization algorithm to adjust a transmission power spectral density of each of a plurality of transmission channels, each of the transmission channels comprising a plurality of frequency subchannels; b) determining a transmission channel in which, after adjusting the transmission power spectral density, a portion of the frequency subchannels is unused, and determining a group of the remaining transmission channels; and c) applying the optimization algorithm to adjust the transmission power spectral density of each of the transmission channels of the group of the remaining transmission channels with respect to the unused portion of the frequency subchannels, wherein the optimization algorithm maximizes a total bit rate function of the transmission channel, and wherein the total bit rate function B is given by B = f T · ∑ j ⁢ ⁢ log 2 ⁡ ( 1 + p j ·  H j  2 Γ · σ j 2 ) , wherein: p j is the transmission power of the j-th frequency subchannel, |H j | 2 is the power transmission function of the j-th frequency subchannel, σ j 2 is an interfering power of the j-th frequency subchannel at the receiver, Γ is a signal-to-noise ratio gap parameter with Γ≧1 dB, and f T is a symbol; and a controller generating a control signal to cause the adjusted transmission power spectral densities to be applied the transmission channels.