TD-CDMA
From Wikipedia, the free encyclopedia
TD-CDMA, an acronym for Time-division - CDMA, is a channel access method based on using spread spectrum across multiple time slots.[1] It is shown that a mixture of TDMA and CDMA provides better quality of service for multimedia communications in terms of data throughput and voice/video quality.[2]
[edit] Standardized implementations
TD-CDMA is used in IMT-2000's 3G air interface, defined as IMT-TD Time-Division, and can also be found in use in UMTS air interfaces, as standardized by the 3GPP in UTRA-TDD HCR. UTRA-TDD HCR is closely related to W-CDMA (UMTS), and provides the same types of channels where possible. UMTS's HSDPA/HSUPA enhancements are also implemented under TD-CDMA.[3]
[edit] References
- ^ Forkel et al. (2002). "Performance Comparison Between UTRA-TDD High Chip Rate And Low Chip Rate Operation". http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.11.3672. Retrieved 2009-02-16.
- ^ Suh et al. (2005). "Throughput maximization in multimedia TDMA/CDMA systems". http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=1558020&isnumber=33097.
- ^ "IPWireless Ships First Commercial 3GPP Chipset with Full HSDPA Implementation". ipwireless.com. Archived from the original on 2007-09-27. http://web.archive.org/web/20070927010536/http://www.ipwireless.com/news/press_020805.html. Retrieved 2008-02-28.
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