MULTIPLE COCHANNEL INTERFERENCE EFFECTS IN A 1ST-ORDER PHASE-LOCKED LOOP

The phase error statistics of a first-order phase-locked loop in the p resence of multiple cochannel CW interference and additive noise is de rived. An accurate numerical solution based on; the nonlinear theory i s outlined. Approximate analytical formulae are obtained from the line ar theory for low interference-to-signal ratios. The linear analysis s hows that the phase error statistics in the linear approximation depen ds only on the interference-to-signal ratio independent of the number of interferers and the interference power distribution. Errors appeare d in some of the numerical results reported by Yoon and Lindsey [1] in the single interferer case are identified and corrected. Numerical ex amples for N = 2, 3, and 6 interferers of equal power are given. The e ffect of the interference power distribution is investigated.