Abstract :
Adaptive antenna arrays have been regarded as a key solution for increasing the spectral efficiency and improving the system performance in 3G and 4G mobile communication systems. Although the implementation of adaptive antennas is mainly investigated in the base transceiver station (BTS), it is interesting to evaluate their performance at the mobile level. The paper analyzes the results of propagation measurements, carried out at 1.9 GHz, in a code division multiple access (CDMA) system with a triangle planar inverted-F antenna (PIFA) array, not only in signal transmission, but also in reception, with the aim of acquiring a suitable prototype that can be applied to adaptive antenna systems. Different wireless environments, such as suburban, indoor, and woodland are used, with line-of-sight (LOS) and nonline-of-sight (NLOS) scenarios. The analysis of results is based on attenuation prediction and comparisons with the received signal by a traditional monopole that is still much used in handsets.
Keywords :
3G mobile communication; 4G mobile communication; UHF antennas; adaptive antenna arrays; antenna radiation patterns; cochannel interference; code division multiple access; electromagnetic wave absorption; electromagnetic wave scattering; fading channels; indoor radio; interference suppression; mobile antennas; mobile radio; monopole antennas; multipath channels; planar antenna arrays; receiving antennas; transmitting antennas; 1.9 GHz; 3G mobile communication system; 4G mobile communication system; CDMA adaptive system; adaptive antenna arrays; attenuation prediction; base transceiver station; cochannel interference suppression; code division multiple access system; indoor wireless environment; line-of-sight scenario; mobile radio; monopole antenna; multipath fading; nonline-of-sight scenario; radiation pattern; suburban environment; triangle PIFA array; triangle planar inverted-F antenna array; woodland environment; Adaptive arrays; Adaptive systems; Antenna arrays; Antennas and propagation; Mobile antennas; Multiaccess communication; Performance analysis; Signal analysis; System performance; Transmitting antennas;
