Experimental and theoretical analysis of adjacent channel interference characteristics caused by two digital PSK signals

Adjacent channel interference characteristics due to two PSK signals are di scussed based on experimental and theoretical analysis. Experiments were co nducted in-house and by using a Ku-band satellite. The experimental approac h indicates that the interference characteristics (bit error rate) depend o n the ratio of interference to desired signal power for the weak interferen ce, irrespective of different interference conditions. The theoretical appr oach proposes the estimation of interference characteristics based on the a mplitude probability density function of interference signal components. It is found from quantitative evaluation that although the conventional metho d, which treats interference as thermal noise, estimates the interference c haracteristics well only for the weak interference, the proposed method est imates the interference characteristics well for both weak and strong inter ference. Finally, the required increase of the signal power in compensation for the degradation of the bit error rate and achievement of the objective bit error rate is discussed. (C) 2000 Scripta Technica, Electron Comm Jpn Pt 1, 83(7): 92-102, 2000.