Performance Analysis of Mean Value-Based Power Allocation with Primary User Interference in Spectrum Sharing Systems

TL;DR

This paper derives exact and approximate capacity expressions for secondary and primary users in spectrum sharing systems, proposing a power allocation scheme that considers primary interference and comparing their performance.

Contribution

It introduces a primary user capacity loss-based power allocation scheme and provides exact and approximate capacity formulas considering primary interference.

Findings

Exact ergodic capacity expression for secondary user

Approximate primary user capacity formula

Performance comparison of power allocation schemes

Abstract

In this paper, we provide an exact expression for the ergodic capacity of the secondary user, and a unified closed-form expression for its bounds with taking the consideration of the primary interference at the secondary receiver. In addition, a simple but accurate approximation of the the ergodic capacity of the primary user is presented. Moreover, a primary user capacity loss based power allocation scheme for the secondary user is also proposed. Finally, we compare the performance of the two power allocation schemes in terms of the sum capacity. The results are validated through using numerical results and simulations.