A most spectrum-efficient duplexing system: CDD

William C. Y. Lee

doi:10.1117/12.445224

18 October 2001 A most spectrum-efficient duplexing system: CDD

William C. Y. Lee

Proceedings Volume 4586, Wireless and Mobile Communications; (2001) https://doi.org/10.1117/12.445224
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China

Abstract

The game to play in wireless communications when it comes to increasing spectrum efficiency is to eliminate interference. Currently, all cellular systems use FDD (Frequency Division Duplexing) in an attempt to eliminate the interference from the adjacent cells. Through the use of many technologies only one type of interference remains and that is the adjacent base-tohome mobile interference. TDD (Time Division Duplexing) has not been used for mobile cellular systems, not only because of the adjacent base-to-home mobile interference, but also because of the additional adjacent base-to-home base interference, and adjacent mobile-to-home mobile interference. Therefore, TDD can only be used for small, confined area systems. CDD (Code Division Duplexing) can eliminate all three kinds of interference; the adjacent base-to-home mobile, the adjacent baseto-home base, and the adjacent mobile- to- home in cellular systems. Eliminating each of these interferences makes CDD the most spectrum efficient duplexing system. This talk will elaborate on a set of smart codes, which will make an efficient CDD system a reality.

Citation Download Citation

William C. Y. Lee "A most spectrum-efficient duplexing system: CDD", Proc. SPIE 4586, Wireless and Mobile Communications, (18 October 2001); https://doi.org/10.1117/12.445224

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