Detection Performance of Or-ing Device with Pre- and Post-Averaging: Part 2.211 Phase-Inchoherent Signal

摘要

The detection performance of an 'or-ing' device with pre-averaging and post-211u001eaveraging has been determined in the form of numerous receiver operating 211u001echaracteristics covering a wide range of input signal-to-noise ratios. Numerical 211u001eevaluation of the false alarm probability P (sub f) and detection probability 211u001eP(sub d) has been conducted for the case of a phase-incoherant signal in the 211u001epresence of additive Gaussian noise for a wide range of values of K, the amount 211u001eof pre-averaging before 'or-ing;' N, the number of channels or-ed; and M, the 211u001eamount of post-averaging after'or-ing.' A MATLAB program that can be used to 211u001eextend these results to parameter values outside the range studied here is also 211u001elisted. The tradeoffs associated with switching from post-averaging to pre-211u001eaveraging, or vice-versa, have been thoroughly investigated and tabulated for a 211u001estandard operating point (Pf=1E-3, pd=0.5) and for a high-quality operating point 211u001e(Pf=1E-6, Pd-0.9). The losses associated with doing too little pre-averaging can 211u001ebe severe, especially for large number, N, of 'or-ed' channels.