Onbody Diversity and Angle-of-Arrival Measurement Using a Pattern Switching Antenna
- 7 April 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 57 (4), 964-971
- https://doi.org/10.1109/tap.2009.2014597
Abstract
Diversity is one of the methods to overcome the multipath effect in the mobile environment. A pattern diversity antenna with four beams was used to investigate the diversity performance in the onbody environment. A switched diversity combining method-switch-and-stay strategy-was used to analyze the data. Finding an angle of arrival (AoA) of different multipath components is very useful since it allows optimization of the base-station antenna radiation patterns and can be used to locate and track the handsets that operate in a particular cell. Similarly, in onbody communications, knowing the AoA enables determining the position of the antennas relative to each other and supports the design of antennas with optimized radiation patterns. Diversity and AoA measurements have been performed for five randomly movements body channels. In diversity measurements, the antenna beams are switched quickly considerably faster than the body movements. The results show that significanct gains are achieved for non-line-of-sight channels and no gain is obtained for the LOS channel since the signal is received by the same beam during the measurement. During AoA measurements, the 2-D process is chosen in which the angles are in a 2-D plane around the ground plane of the antenna. The main propagation paths of the transmitted signal are limited to a limited interval of the AoA range. These AoA estimates for onbody propagation channels can be used for designing better fixed beam and pattern diversity antennas.Keywords
This publication has 11 references indexed in Scilit:
- CPW-Fed Disc-loaded Monopole Array Antenna with Integrated PIN Diode SwitchesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- Spatial and Temporal Characteristics of Multipaths in Indoor EnvironmentsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Antennas for on-body communication systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- On-body path gain variations with changing body posture and antenna positionPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Antenna-Pattern Diversity Versus Space Diversity for Use at HandheldsIEEE Transactions on Vehicular Technology, 2004
- Measurements of on-body propagation characteristicsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Improved method for estimating angle of arrival in multipath conditions using the 'MUSIC' algorithmPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Performance analysis of ESPRIT, TLS-ESPRIT and Unitary-ESPRIT algorithms for DOA estimation in a W-CDMA mobile systemPublished by Institution of Engineering and Technology (IET) ,2000
- Diversity gain from a single-port adaptive antenna using switched parasitic elements illustrated with a wire and monopole prototypeIEEE Transactions on Antennas and Propagation, 1999
- Switched parasitic elements for antenna diversityIEEE Transactions on Antennas and Propagation, 1999