Patent ID: 7386045

Claim:
Apparatus for an ultra wide bandwidth (UWB) impulse radio (IR) communications system wherein user information bits are modulated to include, in part, a plurality of pulses N s for each information bit, the apparatus comprising: means responsive to a communication signal on a particular user link associated with a desired user for determining channel state information therefrom; means responsive to said channel state information for adaptively varying a modulation parameter so that data throughput on said user link is substantially optimized, the modulation parameter being a measure of the number of pulses per user information bit, N s opt , wherein the means for adaptively varying further includes means for calculating N s opt as: N s opt ≈ SNR opt / ξ ^ , where {circumflex over (ξ)} is the determined channel state information and SNR opt is a constant value determined as follows: SNR opt = arg ⁢ ⁢ Min SNR opt ⁢ ∫ ξ min ξ max ⁢ ( N s opt ⁡ ( ξ ) - SNR opt ξ ) 2 ⁢ ⁢ ⅆ ξ .