Studies on spectral efficiency of the CDD system

Xiaolu Jin, Meng Ma, Bingli Jiao, William C.Y. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

13 Scopus citations


This paper presents a systematic solution to enable the code division duplex (CDD) system that allows the uplink- and downlink channel to work on the same frequency at the same time but with different smart codes. CDD is considered to be most spectral efficient among all other duplex systems. However, in comparison with the frequency division duplex (FDD) system, a CDD mobile station (MS) receiver can suffer from an additional interference transmitted from other MSs in its vicinity, and the Base Station (BS) receiver can suffer from another additional interference delivered from the BS transmitter. Also the BS may have interference caused by the neighboring BS. In the proposed system, the MS to MS interference is reduced using a scheduling method which separates the desired MS from the interference MSs in distance, and the BS to BS interference is effectively alleviated by the use of distributed receive antennas and, furthermore, it can be reduced by the proposed interference cancellation technique. The theoretical calculations show that the CDD system has about twice large capacity compared to the FDD system.

Original languageEnglish
Title of host publicationProceedings of the 2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall
StatePublished - 2009
Externally publishedYes
Event2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall - Anchorage, AK, United States
Duration: 20 Sep 200923 Sep 2009

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


Conference2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall
Country/TerritoryUnited States
CityAnchorage, AK


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