An inverse problem based approach for channel parameters estimation in UWB systems

We propose a new blind method to estimate the channel parameters, such as multipath time-of-arrival (TOA) and scattering parameters, for an ultra-wideband (UWB) communication system. We treat the parameter estimation as a mathematical inverse problem and reformulate it as a large scale linear least squares problem. We then apply conjugate gradients (CG) iterations on the resulting normal equations (NE) to obtain the solution, using which we recover the channel parameters. Simulation results exhibit the robustness of our algorithm in the regimes of low signal-to-noise ratios (SNRs) and in frequency dependent scattering channels.