Simple and accurate methods for outage analysis in cellular mobile radio systems-a unified approach

TitleSimple and accurate methods for outage analysis in cellular mobile radio systems-a unified approach
Publication TypeJournal Article
Year of Publication2001
AuthorsAnnamalai, A., C. Tellambura, and V. K. Bhargava
JournalCommunications, IEEE Transactions on
Pagination303 -316
Date Publishedfeb.
Keywordsapproximation theory, CDMA, cellular mobile radio systems, cellular radio, closed-form expressions, cochannel interference, code division multiple access, correlated interferers, Fourier inversion formula, Fourier transforms, generalized fading channels, interference suppression, inverse problems, Laplace inversion formula, Laplace transforms, minimum detectable receiver signal threshold, multiaccess interference, multiuser channels, multiuser detection, Nakagami-m approximation model, Nakagami-m channel, noise-limited model, outage analysis, outage probability, receiver noise, refined outage criterion, Rician channels, signal detection, signal statistics

Two unified expressions for computing the refined outage criterion (which considers the receiver noise) in cellular mobile radio systems are derived using the Laplace and Fourier inversion formulas. Since these expressions do not impose any restrictions on the signal statistics while being easy to program, they provide a powerful tool for outage analysis over generalized fading channels. We also assess compatibility and applicability of previously published approaches that treat noise as cochannel interference (noise-limited model) or consider a minimum detectable receiver signal threshold and receiver noise. The outage probability in an interference-limited case can be evaluated directly by setting the minimum power threshold to zero. The analysis of correlated interferers is presented. Results are also developed for a random number of interferers. Several new closed-form expressions for the outage probability are also derived. Some previous studies have suggested approximating Rician desired signal statistics by a Nakagami-m (1960) model (with positive integer fading severity index) to circumvent the difficulty in evaluating the outage in Rician fading. The suitability of this approximation is examined by comparing the outage performance under these two fading conditions. Surprisingly, some basic results for Nakagami-m channel have been overlooked, which has led to misleadingly optimistic results with the Nakagami-m approximation model. However, similar approximation for the interferer signals is valid


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