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Spatial and Temporal Filtering for Co-Channel Interference in CDMA

  • Ryuji Kohno

Abstract

This paper provides a brief review of the challenges and opportunities that arise for improving user capacity of spread spectrum multiple access (SSMA) or code division multiple access (CDMA) based on spread spectrum techniques. Co-channel interference (CCI) in CDMA is the most dominant factor in the limitation of user capacity, while capacities of FDMA and TDMA capacities are primarily bandwidth limited. From an information theoretical viewpoint, however, an optimum multi-user receiver for CDMA can be derived by utilizing CCI as redundant information distributed among multiple accessing users. In practical channels such as personal, indoor, mobile radio communication channels, more feasible receivers are required to combat with multipath fading that causes estimation errors of channel characteristics due to time variance. An overview of several CCI cancellation schemes to carry out sub-optimum but practical multi-user receivers for CDMA is provided mainly from our works by classifying them to the processing on temporal domain, that on spatial one, and that on both domains.

Keywords

Array Antenna Code Division Multiple Access Maximum Entropy Method Spreading Sequence Code Division Multiple Access System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1995

Authors and Affiliations

  • Ryuji Kohno

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