An autocorrelation is computed on the inphase and quadrature data, using a standard pulse pair algorithm . The output of the standard pulse pair algorithm are the zeroth and first lag of the complex autocorrelation function: Rn(0) and Rn(Ts). The total received power is defined as: Pn = Rn(0), and the resultant vector of the lag one autocorrelation is defined as: Rn(Ts) = An + jBn; where n denotes the frequency number (1 £ n £ 5). The autocorrelation is performed simultaneously on all transmitted frequencies. Vector addition is performed across the frequencies, yielding resultant vector R(Ts) , as given by equation 1: