Date of Award
Master of Science (MS)
Dr. Daniel L. Noneaker, Committee Chair
Dr. Harlan B. Russell
Dr. Kuang-Ching Wang
The standard Gaussian approximation is extended to the performance analysis of direct-sequence code-division multiple-access (DS-CDMA) systems using binary con-volutional coding, quaternary modulation with quaternary direct-sequence spreading and Viterbi decoding. Using the standard Gaussian approximation, the random variables mod-eling the multiple-access interference in the receiver statistics are replaced by an equivalent additive Gaussian noise term with the same variance as the actual multiple-access interfer-ence term. The Gaussian approximation is shown to result in an accurate approximation to the probability of code-word error at the receiver. The accuracy is demonstrated by compar-ing simulation results for the actual multiple-access system and a model using the standard Gaussian approximation. Both are compared with two previously developed closed-form bounds on the performance: the concave-ﬁrst-event bound and the concave-integral bound.
Kar, Snigdhaswin, "The Gaussian Approximation to Multiple-Access Interference in the Evaluation of the Performance of a Communication System with Convolutional Coding and Viterbi Decoding" (2015). All Theses. 2514.