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Adaptive anti-jamming algorithm in DS-CDMA cellular system

This paper describes an adaptive anti-jamming algorithm in DS-CDMA cellular system. The proposed algorithm consists of detection, verification and control modules. The detection module is based on the investigation of user's Eb/Mo received at the channel element (CE) of Base Station (BS) for finding a jamming mobile station (MS) when all the SNRs of the mobile stations are greater than a threshold. In order to find the jamming MS in which the mean of received Eb/No is less than 8.5 dB, the verification module is based on transmitting the decreased power control bit to the MS. The control module is based on the disconnection of active call of jamming MS. As a result, we can find a jamming MS using the adaptive anti-jamming algorithm in DS-CDMA cellular system and prevent the coverage of cell from shrinking due to the jamming MS and decrease the load of system by hand-off.