A novel parameter estimation technique for software defined radio system based on broadband multi-port receiver

A new universal technique for communication signal parameter estimation of a software defined radio system with an arbitrary multi-port receiver based on solution of its quadric equations by the maximum likelihood method is proposed. The expressions for error matrix of estimating parameters are obtained in linear approximation that allows one to investigate analytically the uncertainties of estimaiton. An optimisation method of multi-port junction parameters for measurement in very wide frequency range is described. The results of computer simulation confirming the theoretical conclusions are given.