New series representation for the trivariate non-central chi-squared distribution

Authors:
Prathapasinghe Dharmawansa;Nandana Rajatheva;Chinthananda Tellambura
Affiliations:
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong and Telecommunications Field of Study, School of Engineering and Technology, A ...;Telecommunications Field of Study, School of Engineering and Technology, Asian Institute of Technology, Pathumthani, Thailand;Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

This paper derives a new infinite series representation for the trivariate Non-central chi-squared distribution when the underlying correlated Gaussian variables have a tridiagonal form of an inverse covariance matrix. The joint probability density function is derived using Miller's approach and Dougall's identity. Moreover, the trivariate cumulative distribution function (cdf) and characteristic function (chf) are also derived. Finally, the bivariate non-central chi-squared distribution and some known forms are shown to be special cases of the more general distribution. However, the derivation of non-central chi-squared distribution for an arbitrary covariance matrix seems intractable via Miller's approach. Two applications of the newly derived results are provided for performance analysis of multiple input multiple output (MIMO) systems with transmit antenna selection over a correlated Rician fading environment. Some numerical results are also presented to verify the accuracy of the analytical expressions.