tailieunhanh - Báo cáo hóa học: " Joint iterative beamforming and power adaptation for MIMO ad hoc networks"

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: Joint iterative beamforming and power adaptation for MIMO ad hoc networks | Zeydan et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 79 EURASIP Journal on . http content 2011 1 79 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Joint iterative beamforming and power adaptation for MIMO ad hoc networks Engin Zeydan1 Didem Kivanc2 Ufuk Tureli2 and Cristina Comaniciu1 Abstract In this paper we present distributed cooperative and regret-matching-based learning schemes for joint transmit power and beamforming selection for multiple antenna wireless ad hoc networks operating in a multi-user interference environment. Under the total network power minimization criterion a joint iterative approach is proposed to reduce the mutual interference at each node while ensuring a constant received signal-to-interference and noise ratio at each receiver. In cooperative and regret-matching-based power minimization algorithms transmit beamformers are selected from a predefined codebook to minimize the total power. By selecting transmit beamformers judiciously and performing power adaptation the cooperative algorithm is shown to converge to a pure strategy Nash equilibrium with high probability in the interference impaired network. The proposed cooperative and regret-matching-based distributed algorithms are also compared with centralized solutions through simulation results. Keywords MIMO ad hoc networks game theory beamforming 1 Introduction Multiple-input multiple-output MIMO communication techniques have been shown to boost the capacity and spectral efficiency of wireless communication systems 1 2 . MIMO wireless systems can sustain more simultaneous transmissions in a reduced area through interference management 3 . When transmission parameters such as transmit power beamformer selection frequency modulation transmission rate are modified to adapt to the interference environment MIMO systems gain an additional advantage. Adaptive wireless systems can achieve system .