Negatively correlated diversity branches using various modulation methods and maximal ratio combining
Abstract
A diversity system using maximal ratio combining, and in which the diversity branches are negatively correlated, is considered. The performance of some digital systems, namely PSK, DPSK, CFSK, and NFSK, are compared. The error probability as a function of frequency differences between the branches is given. Also, error probability averaged over time delay difference tau is given as a function of direct as well as indirect signaltonoise ratio. The sensitivity of the error probability to the form of the density function of tau is investigated. Mth order of diversity is considered, but second and thirdorder diversity are specifically analyzed.
 Publication:

IEEE Transactions on Communications
 Pub Date:
 December 1985
 Bibcode:
 1985ITCom..33.1323A
 Keywords:

 Error Analysis;
 Frequency Shift Keying;
 Phase Shift Keying;
 Signal To Noise Ratios;
 Probability Theory;
 Time Lag;
 Communications and Radar