Error probability of offset differential phase shift keying with intersymbol and adjacent channel interference
Abstract
Error probabilities are computed for conventional and symmetric differential phase shift keying (CDPSK and SDPSK, respectively) with differential detection in systems with binary, ternary, and quaternary symbols and with two kinds of filters. In the first system, the system response is a Butterworth filter with two, three, and four poles, which causes both intersymbol interference (ISI) and noise correlation which are dependent on the normalized 3 dB filter bandwidth B. In the second system, the system response is a Nyquist filter with excess bandwidth. In the latter system, consideration is given to ISI caused by errors in sampling time and adjacent channel interference (ACI) due to a signal in a neighboring channel with a frequency separation of f(A). It is shown that for B less than 1.0, binary and ternary SDPSK is better than CDPSK. In the system with the Nyquist filter, SDPSK is either better than or the same as CDPSK when ISI is accounted for; the opposite is true when ACI is considered.
 Publication:

IEE Proceedings F: Communications Radar and Signal Processing
 Pub Date:
 April 1988
 Bibcode:
 1988IPCRS.135..175K
 Keywords:

 Bit Error Rate;
 Channel Noise;
 Digital Filters;
 Intersymbolic Interference;
 Phase Shift Keying;
 Adjusting;
 Nyquist Frequencies;
 Probability Density Functions;
 Signal To Noise Ratios;
 Communications and Radar