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Performance of Adaptive Antennas in FH-GSM Using Conventional Beamforming

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Abstract

This paper presents the performance of adaptiveantennas in a 1/3 reuse frequency hopping GSM networkusing conventional beamforming. It mainlyfocuses on C/I improvement for the purpose of capacityenhancement. The performance evaluation has beenconducted by means of network computer simulations,where measured time-space radio channel impulseresponses are applied for the desired user in thenetwork. Measurements with an M = 8 element uniformlinear array were conducted in the cities ofAarhus, Denmark, and Stockholm, Sweden. The simulatedC/I improvement shows an almost 10 * log10(M)behavior for low azimuth spread values. For largevalues of azimuth spread (relative to the antennabeamwidth), the performance gain is reducedsignificantly. For an azimuth spread of10°–12°, which has been measured inurban macro-cellular environments, the C/I gain forM = 8 is reduced to approx. 5.5–7.5 dB (which should becompared to the theoretical value of 9 dB for a pointsource). The designed DoA algorithm is very robust toco-channel interference and only a small degradationin performance is observed for single element C/I downto approx. –8 dB. We conclude that the designedbeamforming implementation facilitates a potentialcapacity gain of ×3 in a 1/3 reuse FH-GSM network foran array size of M = 4–6.

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Authors and Affiliations

  1. Center for Personkommunikation, Aalborg University, Fr. Bajers Vej 7A6-2, DK-9920, Aalborg, Denmark

    Preben E. Mogensen, Poul Leth Espensen, Per Zetterberg, Klaus I. Pedersen & Frank Frederiksen

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  1. Preben E. Mogensen
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  2. Poul Leth Espensen
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  3. Per Zetterberg
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  4. Klaus I. Pedersen
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  5. Frank Frederiksen
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Mogensen, P.E., Espensen, P.L., Zetterberg, P. et al. Performance of Adaptive Antennas in FH-GSM Using Conventional Beamforming. Wireless Personal Communications 14, 255–274 (2000). https://doi.org/10.1023/A:1008975420402

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