Please use this identifier to cite or link to this item: https://doi.org/10.1109/25.330156
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dc.titleShared time division duplexing: An approach to low-delay high-quality wireless digital speech communications
dc.contributor.authorWong, Wai-Choong
dc.contributor.authorSundberg, Carl-Erik W.
dc.contributor.authorSeshadri, Nambi
dc.date.accessioned2014-10-07T03:05:15Z
dc.date.available2014-10-07T03:05:15Z
dc.date.issued1994-11
dc.identifier.citationWong, Wai-Choong, Sundberg, Carl-Erik W., Seshadri, Nambi (1994-11). Shared time division duplexing: An approach to low-delay high-quality wireless digital speech communications. IEEE Transactions on Vehicular Technology 43 (4) : 934-944. ScholarBank@NUS Repository. https://doi.org/10.1109/25.330156
dc.identifier.issn00189545
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/81154
dc.description.abstractVarious strategies to provide low-delay high-quality digital speech communications in a high-capacity wireless network are examined. 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, a low-delay multiple access scheme, called shared time-division duplexing (STDD) is proposed. This scheme 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. We also propose a choice of low delay, high quality speech coding and digital modulation systems based on adaptive DPCM, with QDPSK or pseudo-analog transmission (skewed DPSK), for use in conjunction with the STDD multiple access protocol. The choice of the alternative systems depends on required end-to-end delay, recovered speech quality and bandwidth efficiency. Typically, with a total capacity of 1 MBaud, 2 ms frame and 8 kBaud speech coding 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%.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1109/25.330156
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentELECTRICAL ENGINEERING
dc.description.doi10.1109/25.330156
dc.description.sourcetitleIEEE Transactions on Vehicular Technology
dc.description.volume43
dc.description.issue4
dc.description.page934-944
dc.description.codenITVTA
dc.identifier.isiutA1994PR79800015
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