tailieunhanh - Báo cáo hóa học: " An OFDMA resource allocation algorithm based on coalitional games"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An OFDMA resource allocation algorithm based on coalitional games | Shams et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 46 EURASIP Journal on . http content 20ii i 46 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access An OFDMA resource allocation algorithm based on coalitional games Farshad Shams1 Giacomo Bacci2 and Marco Luise2 Abstract This work investigates a fair adaptive resource management criterion in terms of transmit powers and subchannel assignment for the uplink of an orthogonal frequency-division multiple access network populated by mobile users with constraints in terms of target data rates. The inherent optimization problem is tackled with the analytical tools of coalitional game theory and a practical algorithm based on Markov modeling is introduced. The proposed scheme allows the mobile devices to fulfill their rate demands exactly with a minimum utilization of network resources. Simulation results show that the average number of operations of the proposed iterative algorithm are much lower than K N where N and K are the number of allocated subcarriers and of mobile terminals. 1. Introduction The advent of high-definition entertainment services justifies the need for wideband high-capacity wireless communication technologies that use the available bandwidth efficiently and provide data rates close to channel capacity 1 . Multicarrier channel access techniques such as orthogonal frequency-division multiple access OFDMA can be exploited to increase data rates by divi ding a frequency-selective broadband channel into a multitude of orthogonal narrowband flat-fading subchannels. An intelligent and scalable joint power and bandwidth allocation mechanism is crucial to ensure the quality of service QoS to the consumer at a reasonable cost 2 . The problem of subcarrier and power assignment in OFDMA has been extensively considered in the literature during the last few years. The proposed solutions mainly fall into two different categories .