tailieunhanh - Báo cáo hóa học: " A Joint Solution to Scheduling and Power Control for Multicasting in Wireless 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: A Joint Solution to Scheduling and Power Control for Multicasting in Wireless Ad Hoc Networks | EURASIP Journal on Applied Signal Processing 2005 2 144-152 2005 Hindawi Publishing Corporation A Joint Solution to Scheduling and Power Control for Multicasting in Wireless Ad Hoc Networks Kang Wang Department of Electrical and Computer Engineering University of California San Diego La Jolla CA 92093-0407 USA Email kwang@ Carla-Fabiana Chiasserini Dipartimento di Elettronica Politecnico di Torino 10129 Torino Italy Email chiasserini@ Ramesh R. Rao Department of Electrical and Computer Engineering University of California San Diego La Jolla CA 92093-0407 USA Em ail rao@ John G. Proakis Department of Electrical and Computer Engineering University of California San Diego La Jolla CA 92093-0407 USA Email proakis@ Received 1 August 2003 Revised 7 May 2004 This paper jointly addresses the problem of power control and scheduling in ad hoc networks supporting multicast traffic. First we present a distributed algorithm which given the set of multicast transmitters and their corresponding receivers provides an optimal solution to the power control problem if there is any. The transmit power levels obtained by solving the optimization problem minimize the network power expenditure while meeting the requirements on the SINR at the receivers. Whenever no optimal solution can be found for the given set of multicast transmitters we introduce a joint scheduling and power control algorithm which eliminates the strong interferers thus allowing the other transmitters to solve the power control problem. The algorithm can be implemented in a distributed manner. Although the proposed scheme provides a suboptimal solution simulation results show that the obtained solution is close to the global optimum when it exists. When instead there is no optimal solution our algorithm allows for a high number of successful multicast transmissions. Keywords and phrases wireless ad hoc networks scheduling power control multicasting. 1. INTRODUCTION Multicasting