Mobility

Subcarrier and Power Adaptation for Multiuser OFDMA-Based Cognitive Radio Systems

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Executive Summary

This paper investigates the subcarrier and power allocation problem for an OFDM-based multiuser Cognitive Radio (CR) system. For CR systems it is important to keep the interference introduced to the Primary User (PU) band within a tolerable range. Since the joint subcarrier and power allocation problem is a non-convex integer problem and a closed form solution is difficult to find, a suboptimal algorithm that separates subcarrier and power allocation is proposed. First, a suboptimal subcarrier algorithm is proposed that allocates subcarriers to CR users that not only increase the capacity, but also reduces the interference introduced to the Primary User (PU) band.

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