A Co-channel interference cancellation technique using orthogonal convolutional code
Date
1995
Authors
Sanada, Yukitoshi
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
In this thesis a new parallel co-channel interference cancellation technique which utilizes orthogonal convolutional codes is proposed and investigated.
In a spread spectrum multiple access environment, co-channel interference (CCI) limits the performance of the communication link. To remove this interference, several CCI cancellation techniques have been proposed, including those techniques which do not require the receiver to have knowledge of the cross-correlation between user sequences. These methods leave residual interference after the cancellation caused by errors on the initial decisions.
To improve the initial decisions and reduce the residual interference, the proposed scheme utilizes the error correcting capability of the orthogonal convolutional code. It is shown that the proposed CCI canceller offers an improvement in capacity by a factor of 1.5 ~ 3 as compared with a conventional canceller on A WGN channel and multipath Rayleigh fading channel. The proposed canceller works in the presence of residual interference due to imperfect cancellation. The proposed canceller also has a capacity improvement with the use of soft handoff in a multicell configuration.