By D.J. Creasey
Covers the various points of contemporary sign processing platforms from the transduction unit via to the show
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It is now a simple matter to obtain the mean output SNR from (20) by writing 1* = I n = 1 r = M (23) and thus it can be seen that yR varies linearly with the number of branches M. 7 Equal gain combining Equal gain combining is similar to maximal ratio but there is no attempt at weighting the signals before addition. The envelope of the output signal is given by (15) with all ak = 1 M and the output SNR is therefore JE = r2 2NM Of the diversity systems so far considered, equal gain is analytically the most difficult to handle because the output r is the sum of M Rayleigh-distributed variables.
In a similar manner we expect DPSK, for which a = 1 to achieve the same error rate at exactly 3 dB less SNR than non-coherent FSK, for which a = \. To compare coherent and non-coherent systems we can compare DPSK with ideal PSK. T (M - 1/2) /2)! J Thus at low error rates in Rayleigh fading conditions DPSK is 3 dB worse than PSK, a result which was obtained earlier. However the use of four-branch diversity reduces the difference to about 1 dB, which is the same as the difference under non-fading conditions.
5. DAKIN, J. , WADE, C. , HENNING, M. , 1984, Elect. Lett. 20, 53-54. 6. SHORROCKS, N. , BROWN, M. , WHATMORE, R. , AINGER, F. , 1982, 'Piezoelectric Composites for Underwater Transducers', Conference Proceedings, 1982 European Ferroelectrics Meeting, Malagar, Spain. Chapter 6 Diversity techniques in communications receivers J. D. 1 Introduction In all except very simple transmission conditions, radio communication links are subjected to conditions in which energy can travel from the transmitter to the receiver via more than one path.