| 摘要 |
There is provided a method of rapid Received Signal Strength Indication (RSSI) of a time-dispersed signal having echoes (D, Fig. 1C) (where the time dispersal represents a significant fraction or more of the transmitted symbol interval). It comprises a sliding correlation (304) of a received signal against a known sequence or via channel sounding to obtain the time-dispersal function of the communications channel upon which the signal is transmitted (306/307) and a summation of the squares of the quadrature components of the energies at relative maxima of the correlations (306/307) (correlation peaks determined with reference to a threshold level (305)) to integrate the energy defined by the correlation function to determine the energy present among the time-dispersed echoes utilizing the time-dispersal function. Thus, the energy present in the time-dispersed echoes is related to the received signal strength, the RSSI comprises a scalar of the energy present and the scalar comprises a function of the receiver's gain, RSSI determinations during any given interval are less dependent upon the ambulatory velocity of the receiver, and RSSI determinations of equivalent accuracy are obtained more rapidly or more accurate RSSI determinations are obtained per unit time. |
