A comparison of two systems for downlink communication with basestation antenna arrays |
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Authors: | Zetterberg P. |
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Affiliation: | R. Inst. of Technol., Stockholm; |
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Abstract: | We compare the performance of the downlink of two systems with antenna arrays at the base stations. One system uses a third of the available spectrum per cell 1/3, but reuses the channels three times within each cell. The other system reuses all the spectrum in all cells 1/1, but does not reuse channels within a cell. Thus, the maximum number of users in the two systems is the same. In order to account for the interference, the 1/3 system directs antenna pattern nulls against same cell cochannel users, while the 1/1 system directs nulls against cochannel users in other cells. The performances of the two systems are compared as a function of the azimuth angular width (seen from the base) of the multipaths generated at the mobile, using simulations and analytical derivations. The results herein indicate that the system with 1/1 reuse has a higher performance than the system with 1/3 reuse if fast intercell handover is used or if high dynamic range power control, nulling and synchronization is employed |
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