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This paper gives the interference theoretical analysis, under the co-site and co-antenna of the CDMA2000 1x and CDMA2000 1xEV-DO system. The results show that the reverse capacity will be reduced by 4.8%, and the system with the bilateral adjacent channel interference will be reduced by 9.2% under the co-site and co-antenna system. If the impact of the adjacent channel interference for coverage is very small, this change can be ignored.
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