December 1987
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1 Read
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Publications (11)
November 1987
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11 Reads
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78 Citations
Journal of the Institution of Electronic and Radio Engineers
Propagation measurements are provided for highway and city centre microcells. Measurements along various motorways were taken with base station (BS) antennas at 10 m elevations. Pseudo-random binary sequences (PRBS) were transmitted via non-coherent FSK at 905 MHz. Low radiated power (16 mW into an 18-element Yagi) was used, and the signal level and bit error ratio (BER) were recorded by a mobile station (MS). The microcell length was found to be a function of the received field strength and, therefore, the BER. It was found that the cell lengths varied between 1 to 2 km for a BER of 10¿3 or better. Although the PDF of the received signal was Rician the microcell length was determined using the more pessimistic Rayleigh PDF. Two and three microcell clusters were considered. An inverse fourth power law was observed, and the received signal power in the microcell varied linearly with radiated power. For power levels of only 1 ¿W, error free transmission was found to occur over a cell length of 400 m. Detailed measurements in the Harley Street area in Central London enabled us to study how signals propagate in a nearly rectilinear grid pattern of roads. A theoretical model was established that provided signal levels that were close to those measured. Experiments were performed with the base station at junctions, roundabouts and at major city arteries. The inverse fourth power loss characteristics occurred, and the radiation distribution was found to be relatively insensitive to antenna type as the street pattern was the dominant factor.
June 1987
May 1986
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5 Reads
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4 Citations
April 1986
April 1986
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1 Read
2 Reads
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2 Citations
2 Reads
6 Reads
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1 Citation
5 Reads
Citations (2)
... It has been shown in [1,2] that a 2-D (2-Dimensional) RAKE receiver, which is a combination of a conventional RAKE receiver and antenna arrays, results in substantial improvement in user capacity of systems using DS-CDMA. However, the analysis of the performance of 2-D RAKE receivers requires appropriate spatial characterization of urban areas where: (i) the propagation characteristics in microcells (usually used in urban environments) are found [3,4] to have Rician or Nakagami fading characteristics rather than Rayleigh fading, which is the case in the conventional urban macro-cellular systems; (ii) measurements in different urban areas have shown that the widely used assumption that the Angle of Arrival (AoA) distribution at the Base Station (BS) is uniform over a small angular range is not valid [5]: these are found to have truncated Gaussian or Laplacian distributions [6,7]; (iii) the spatial correlations between the signals received at the array elements have a major effect on the spatial diversity gain. These correlations are determined by the AoA distribution, the inter-element spacing, and the mean angle of arrival. ...
- Citing Article
November 1987
Journal of the Institution of Electronic and Radio Engineers
... These observations suggest that band A 1 is more suitable for communications than band A 2 . A study [25] of 60-GHz propagation conducted for small cells revealed that even along corridors in buildings, free-space propagation was experienced. Satisfactory coverage was experienced without the need to align the transmitter and the receiver in offices and in lecture theaters of differing constructions. ...
- Citing Article