MAXIMAL-RATIO DIVERSITY COMBINERS.
Technical research rept.,
ELECTRICAL ENGINEERING RESEARCH LAB CORNELL UNIV ITHACA N Y
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This report analyzes a maximal-ratio diversity combiner that is typical of the type of diversity combiner used in a wide range of communication and radar systems, including conventional frequency-shift-keyed, differentialphase-shift-keyed, and transmitted reference communication systems, as well as predetection combining systems. When the combiner inputs are independent and identically distributed Gaussian random processes, it is found that the combiner output can be conveniently represented as a product and sum of known time functions, a Gaussian random process, a chi variate, and a Gaussian variate. This representation clearly indicates the performance gain obtained by using diversity. In addition, it simplifies the evaluation of expectations on the combiner output by using this representation, recursion relations with respect to the order of diversity for any well-defined expectation of a function of the combiner output are found. The results of this paper serve to unify and generalize many results dealing with maximal-ratio diversity combiners in addition, many well-known results can be extended easily by suing the recursion relations. Author
- Non-Radio Communications