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This paper investigates the impact of adjacent channel interference between TDD and FDD CDMA operators operating in macro environment. In the TDD-CDMA system, the smart antenna technique is employed and the performance is investigated and compared with the omni-directional antenna. Evaluation of TDD/FDD CDMA system coexistence is studied based on a static simulator. Intersystem interference impacts the capacity under various ACIRs (adjacent channel Interference ratios), the base station location offsets, and the cell radiuses are studied. Furthermore, the differences in impacting the capacity loss between the omni-directional and smart antennas are compared and analyzed. Results and conclusions are shown, which are useful for future CDMA cellular planning and frequency license allocation in 2 GHz.