Linear diversity combining techniques

This paper provides analyses of three types of diversity combining systems in practical use. These are: selection diversity, maximal-ratio diversity, and equal-gain diversity systems. Quantitative measures of the relative performance (under realistic conditions) of the three systems are provided. The effects of various departures from ideal conditions, such as non-Rayleigh fading and partially coherent signal or noise voltages, are considered. Some discussion is also included of the relative merits of predetection and postdetection combining and of the problems in determining and using long-term distributions. The principal results are given in graphs and tables, useful in system design. It is seen that the simplest possible combiner, the equal-gain system, will generally yield performance essentially equivalent to the maximum obtainable from any quasilinear system. The principal application of the results is to diversity communication systems and the discussion is set in that context, but many of the results are also applicable to certain radar and navigation systems.

[1]  H.O. Peterson,et al.  Diversity Receiving System of R.C.A. Communications, Inc., for Radiotelegraphy , 1931, Proceedings of the Institute of Radio Engineers.

[2]  J.B. Moore,et al.  Diversity Telephone Receiving System of R.C.A. Communications, Inc. , 1931, Proceedings of the Institute of Radio Engineers.

[3]  S. Rice.  Filtered Thermal Noise—Fluctuation of Energy as a Function of Interval Length , 1943 .

[4]  F. E. Terman,et al.  Radio Engineers Handbook , 1943 .

[5]  S. Rice.  Mathematical analysis of random noise , 1944 .

[6]  D. Middleton.  On Theoretical Signal‐to‐Noise Ratios in F‐M Receivers: A Comparison with Amplitude Modulation , 1949 .

[7]  R. McNicol.  The fading of radio waves of medium and high frequencies , 1949 .

[8]  H. Booker,et al.  Diffraction from an irregular screen with applications to ionospheric problems , 1950, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[9]  J.L. Glaser,et al.  Experimental Evaluation of Diversity Receiving Systems , 1951, Proceedings of the IRE.

[10]  S.H. Van Wambeck,et al.  Performance of Diversity Receiving Systems , 1951, Proceedings of the IRE.

[11]  John L. Glaser,et al.  Evaluation of Polarization Diversity Performance , 1953, Proceedings of the IRE.

[12]  Arthur H. Hausman.  An Analysis of Dual Diversity Receiving Systems , 1954, Proceedings of the IRE.

[13]  E. S. Pearson.  Biometrika tables for statisticians , 1967 .

[14]  J. Debettencourt,et al.  Investigations of Angular Scattering and Multipath Properties of Tropospheric Propagation of Short Radio Waves beyond the Horizon , 1955, Proceedings of the IRE.

[15]  C. L. Mack.  Diversity Reception in UHF Long-Range Communications , 1955, Proceedings of the IRE.

[16]  B. E. Nichols,et al.  Single-Sideband Techniques in UHF Long-Range Communications , 1956, Proceedings of the IRE.

[17]  W. Sichak,et al.  A simplified diversity communication system for beyond-the-horizon links , 1956 .

[18]  W. Bennett.  Methods of Solving Noise Problems , 1956, Proceedings of the IRE.

[19]  H. Staras.  Diversity Reception with Correlated Signals , 1956 .

[20]  F. E. Bond,et al.  The Effect of Fading on Communication Circuits Subject to Interference , 1957, Proceedings of the IRE.

[21]  G. Grisdale,et al.  Fading of long-distance radio signals and a comparison of space- and polarization-diversity reception in the 6ߝ18Mc/s range , 1957 .

[22]  R. Adams,et al.  Evaluation of IF and Baseband Diversity Combining Receivers , 1958 .

[23]  D. Slepian.  Fluctuations of random noise power , 1958 .

[24]  J. Pierce.  Theoretical Diversity Improvement in Frequency-Shift Keying , 1958, Proceedings of the IRE.

[25]  P. E. Green,et al.  A Communication Technique for Multipath Channels , 1958, Proceedings of the IRE.

[26]  K. Clarke,et al.  Carrier-to-Noise Statistics for Various Carrier and Interference Characteristics , 1958, Proceedings of the IRE.

[27]  Jr. A.T. Waterman.  A rapid beam-swinging experiment in transhorizon propagation , 1958 .

[28]  J. Chisholm,et al.  Angular Diversity Reception at 2290 MC Over a 188-Mile Path , 1959 .