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Shared time division duplexing

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3 Author(s)
Wong, W.C. ; Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore ; Sundberg, C.-E.W. ; Seshadri, N.

Various multiple access schemes based on time-division and packet reservation are compared in terms of their statistical multiplexing capabilities, sensitivity to speech packet dropping, delay, robustness to lossy packet environments, and overhead efficiency. In particular, the authors propose a low-delay multiple access scheme, called shared time-division duplexing (STDD), which allows both the uplink and downlink traffic to share a common channel, thereby achieving high statistical multiplexing gain even with a low population of simultaneous conversations. Typically with a total capacity of 1 Mbaud, 2 ms frame and 8 kbaud speech rate, low delay STDD is able to support 48 pairs of users compared to 38, 35 and 16 for TDMA with speech activity detection, basic TDMA and PRMA respectively. This corresponds to respective gains of 26%, 37% and 200%

Published in:

Singapore ICCS '94. Conference Proceedings.  (Volume:3 )

Date of Conference:

14-18 Nov 1994

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