Propagation studies for microcellular mobile radio
Propagation studies for microcellular mobile radio
Propagation studies as a prerequisite for the design of microcellular digital mobile radio systems are presented. The thrust of our investigations was to characterize a new type of small cell architecture, known as microcells, that would vastly increase user capacity. Our measurements were made at 900MHz and 60GHz which laid the foundation for the design of an Integrated Digital Cellular System (IDCS). In our propagation experiments, pseudo-random binary sequences were transmitted via non-coherent FSK from a base station (BS). The transmitter power was 16 mW at a carrier frequency of 905MHz. The mobile unit recorded the received signal levels and the bit error ratio (BER). In city microcells, an inverse 4th power path loss was observed and the coverage pattern was found to be insensitive to the height and directionality of the BS antenna. Instead, terrain features and street patterns were the dominating factors. Typical microcell lengths varied from 300m to 1km. A model based on geometrical optics and the uniform geometrical theory of diffraction was devised. The results were in broad agreement with those measured. In highway microcells, an inverse 4th power path loss was observed. We found that the microcell lengths varied between 1 to 2 km for a BER less than 0.001. For a transmitter power of 1μW, virtually error free transmissions were achieved over microcell lengths up to 400m. A simple path loss model was also devised. Our studies of 60GHz propagation commenced with measurement in an anechoic chamber. We found that building materials such as glass and platerboards are relatively transparent to 60GHz radiowaves, but wood and metals were not. Experiments at 60GHz in buildings revealed that the mean signal level was evenly distributed across a room, although instantaneous variations were large. For outdoor settings, we established that the line-of-sight transmission was the dominant mode of propagation, and buildings provided good radiation shielding. The concept of the IDCS is embedded throughout the thesis, providing the long term goal associated with our experiments and theory. The IDCS envisaged has overlaying cellular radio clusters with microcells operating at 900MHz as fundamental building blocks. The impetus for the 60GHz studies was to provide a point-to-point distribution system that would interconnect the microcells of the IDCS network. Our deliberations have demonstrated the feasibility of microcellular radio systems, and their impact on society is potentially profound.
University of Southampton
1987
Chia, Si-Tak Stanley
(1987)
Propagation studies for microcellular mobile radio.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Propagation studies as a prerequisite for the design of microcellular digital mobile radio systems are presented. The thrust of our investigations was to characterize a new type of small cell architecture, known as microcells, that would vastly increase user capacity. Our measurements were made at 900MHz and 60GHz which laid the foundation for the design of an Integrated Digital Cellular System (IDCS). In our propagation experiments, pseudo-random binary sequences were transmitted via non-coherent FSK from a base station (BS). The transmitter power was 16 mW at a carrier frequency of 905MHz. The mobile unit recorded the received signal levels and the bit error ratio (BER). In city microcells, an inverse 4th power path loss was observed and the coverage pattern was found to be insensitive to the height and directionality of the BS antenna. Instead, terrain features and street patterns were the dominating factors. Typical microcell lengths varied from 300m to 1km. A model based on geometrical optics and the uniform geometrical theory of diffraction was devised. The results were in broad agreement with those measured. In highway microcells, an inverse 4th power path loss was observed. We found that the microcell lengths varied between 1 to 2 km for a BER less than 0.001. For a transmitter power of 1μW, virtually error free transmissions were achieved over microcell lengths up to 400m. A simple path loss model was also devised. Our studies of 60GHz propagation commenced with measurement in an anechoic chamber. We found that building materials such as glass and platerboards are relatively transparent to 60GHz radiowaves, but wood and metals were not. Experiments at 60GHz in buildings revealed that the mean signal level was evenly distributed across a room, although instantaneous variations were large. For outdoor settings, we established that the line-of-sight transmission was the dominant mode of propagation, and buildings provided good radiation shielding. The concept of the IDCS is embedded throughout the thesis, providing the long term goal associated with our experiments and theory. The IDCS envisaged has overlaying cellular radio clusters with microcells operating at 900MHz as fundamental building blocks. The impetus for the 60GHz studies was to provide a point-to-point distribution system that would interconnect the microcells of the IDCS network. Our deliberations have demonstrated the feasibility of microcellular radio systems, and their impact on society is potentially profound.
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Published date: 1987
Identifiers
Local EPrints ID: 461762
URI: http://eprints.soton.ac.uk/id/eprint/461762
PURE UUID: 5a8ce68f-7c76-49ee-bb68-e6238744e933
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Date deposited: 04 Jul 2022 18:54
Last modified: 04 Jul 2022 18:54
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Author:
Si-Tak Stanley Chia
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