tailieunhanh - Báo cáo hóa học: " Efficient Low Bit-Rate Low-Latency Channelization in DECT Rohit Budhiraja1 and Bhaskar Ramamurthi2"

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: Efficient Low Bit-Rate Low-Latency Channelization in DECT Rohit Budhiraja1 and Bhaskar Ramamurthi2 | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 54148 Pages 1-8 DOI WCN 2006 54148 Efficient Low Bit-Rate Low-Latency Channelization in DECT Rohit Budhiraja1 and Bhaskar Ramamurthi2 1 Midas Communication Technologies Pvt. Ltd. Chennai 600 041 India 2 Telecommunication and Computer Networking TeNet Group Department of Electrical Engineering IIT-Madras Chennai 600 036 India Received 12 September 2005 Revised 6 January 2006 Accepted 12 February 2006 Recommended for Publication by Bhaskar Krishnamachari In a TDMA standard such as DECT low bit-rate transmission is feasible either at the cost of efficiency shorter slots with fixed overhead per slot or increased latency longer frames . This paper proposes a new scheme for low bit-rate low-latency channelization in the DECT standard in which data can be efficiently transmitted at rates as low as 10 kbps. This could be useful for sending acknowledgments for a high-speed data communication link or for vocoder VoIP traffic. The proposed scheme enables efficient low bit-rate transmission by dividing a DECT channel into four subbands and by employing a new slot structure wherein TDMA overhead is kept to a minimum. It is shown that the proposed scheme can coexist with the DECT system and can be implemented using existing IMT-2000 DECT hardware with minor modifications. A comparison is also made of the proposed scheme with existing options for low bit-rate channelization in DECT. Copyright 2006 R. Budhiraja and B. Ramamurthi. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. MOTIVATION In today s scenario advanced voice coding algorithms enable the transmission of toll quality voice at a bit rate as low as 6-8 kbps 1 . Instant messaging and always-on Internet connectivity are also very popular. Low