Experimental validation of radiometric sensitivity in correlation radiometers - Electronics Letters

Assuming a symmetric transmit filter for which the receive filter is to be optimised, we expect the symmetric receive fdter coefficients (eqn. 12) to be practically the same as those for the nonsymmetric filters (eqn. 5). This is verified by a set of examples with different receive filter lengths NR and transmit filter excess bandwidth values a. An AWGN channel with SNR = 8dB (i.e. no linear distortion) is assumed and the transmit filter was chosen to be an RRC filter of length NTc = 25, employing the given a. The values of the normalised MSE between the two solutions are shown in Table 1. It is seen that the MSE difference is always < 0.3%, thus confirming that the resulting filters are the same for all practical purposes.