Preliminary measurement results from an adaptive antenna array testbed for GSM/UMTS
Preben Mogensen, Klaus Ingemann Pedersen, Poul Leth-Espensen, Bernard H. Fleury, F. Frederiksen, Kim Wium Olesen, S.L. Larsen · 2002
This paper presents preliminary measurement results for an 8 element adaptive antenna array in an urban environment. The results show that in most cases the received signal consists of a single narrowly scattered component impinging from the direction towards the mobile. The angular spread (AS) is found to be no larger than 5 degrees for the test measurements. The correlation coefficient between slow fading and AS is -0.56, indicating that the AS increases when the local signal strength fades. The paper also shows the results for a direction of arrival (DoA) algorithm, which is designed for downlink beamsteering in a GSM related system. The results indicate that an averaging window size of one SACCH frame (0.48 s) is a wise choice for DoA estimation in a non-FH network.