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Considering Downlink Intermodulation Distortion in
Switched Multibeam Antennas for Cellular Radio Systems
Mattias Wennström
Vehicular Technology Conference, Fall 2000, (VTC 2000)
Boston, MA, USA, September 24-28, 2000, pp 1858-1865.
© 2000 IEEE
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Abstract:
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The performance and feasibility of switched multibeam array antennas in
cellular systems is investigated. We assume that multicarrier power
amplifiers (MCPA:s) are used in the base-station, to co-amplify the
transmitted signals. The MCPA generates intermodulation distortion and
it is shown how the multibeam antenna makes the radiated
intermodulation distortion dependent
on the azimuthal look-direction. Given the carrier to intermodulation
distortion ratio of the MCPA, semi-analytical expression for the outage probability for the mobiles is
derived assuming a log-normal fading radio channel. Furthermore, the
impact of the frequency reuse factor, trunkpool scheme and number
of antennas is investigated. The analysis show that when the number of
antennas are increased, it is possible to reduce the requirements on
the MCPA linearity.
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Related publications:
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VTC 2000 paper
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Wireless 99 paper Investigation of nonlinearites an adaptive antenna arrays (no switched beams)
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Source:
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Pdf 112K
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