tailieunhanh - Báo cáo hóa học: " A Low-Complexity Source Encoding Assisted Multiple Access Protocol for Voice/Data Integrated Networks Andres Kwasinski"

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 Low-Complexity Source Encoding Assisted Multiple Access Protocol for Voice/Data Integrated Networks Andres Kwasinski | EURASIP Journal on Applied Signal Processing 2005 2 193-206 2005 Hindawi Publishing Corporation A Low-Complexity Source Encoding Assisted Multiple Access Protocol for Voice Data Integrated Networks Andres Kwasinski Department of Electrical and Computer Engineering and The Institute for Systems Research University of Maryland College Park MD 20742 USA Email ak@ Mehdi Alasti Department of Electrical and Computer Engineering and The Institute for Systems Research University of Maryland College Park MD 20742 USA Email mehdi@ K. J. Ray Liu Department of Electrical and Computer Engineering and The Institute for Systems Research University of Maryland College Park MD 20742 USA Email kjrliu@ Nariman Farvardin Department of Electrical and Computer Engineering and The Institute for Systems Research University of Maryland College Park MD 20742 USA Email farvar@ Received 22 August 2003 Revised 19 May 2004 We present and evaluate the performance of a reduced complexity variation to the source encoding assisted multiple access SEAMA protocol for integrating voice and data over a wireless network. This protocol denoted as slow movable-boundary SEAMA SMB-SEAMA uses the same embedded and multistate voice encoder used in the original SEAMA protocol. However in SMB-SEAMA the movable voice data boundary is not set based on the frame-by-frame bandwidth demand of the voice subsystem but on the number of ongoing voice calls and the acceptable average distortion level. This results in a protocol that at the network layer is packet switched for both voice and data however from the data traffic point of view the voice looks like circuit switched. Analytical results show that SMB-SEAMA is a very efficient MAC protocol and presents a model for analyzing the performance of queuing systems with a variable number of servers each with a constant service time. Consequently while reducing the refreshing rate of the movable boundary by three orders of magnitude simulation

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