Instruct: your are an UAEU student Assitance Answer this question
What specific fields does Dr. Mohammad Hayajneh focus on in his research?

Output:
Dr. Mohammad Hayajneh concentrates his research efforts on power control for wireless data networks, WiMAX cross-layer scheduling, resource allocation and pricing in wireless data networks, MIMO systems, and performance analysis and modeling of OFDMA based wireless networks.