Adjacent and co-channel interference from direct sequence spread spectrum systems on analog PAL

This paper presents extensive results of a laboratory test held to examine the conditions under which analog PAL-G and spread spectrum systems can share spectrum. RF TV protection ratios for adjacent and co-channel spread spectrum interference are derived. For the PAL signal two different received levels, giving undistorted baseband SNR 42 and 37 dB respectively, are examined. Different spread spectrum RF bandwidths and carrier frequency offsets between the analog and digital signal are also included in the experiments. Results for all possible interference conditions and cases are presented in tables and 3-D charts.