06-11-2012, 01:49 PM
Introduction to the generation of wireless networks
[attachment=38301]
Wireless
Ability to communicate with people on the move
Guglielmo Marconi demonstrated radio ability to contact with ships sailing the English channel in 1897!
Past 10 years the wireless usage has skyrocketed, making portable radio more smaller, cheaper, and more reliable
Digital switching has facilitated large deployment with affordable cost
This trend will continue even at a greater pace during the next decade!!
Marconi & wireless
Marconi was born at Bologna, Italy in 1874 (Italian father & Irish mother).
In 1895 he began laboratory experiments at his father's country estate at Pontecchio where he succeeded in sending wireless signals over a distance of one and a half miles.
In 1896 Marconi took his apparatus to England where he was introduced to Mr. (later Sir) William Preece, Engineer-in-Chief of the Post Office, and later that year was granted the world's first patent for a system of wireless telegraphy. He demonstrated his system successfully in London, on Salisbury Plain and across the Bristol Channel.
In July 1897 formed: The Wireless Telegraph & Signal Company Limited (in 1900 re-named Marconi's Wireless Telegraph Company Limited). In the same year he gave a demonstration to the Italian Government at Spezia where wireless signals were sent over a distance of twelve miles.
In 1899 he established wireless communication between France and England across the English Channel. He erected permanent wireless stations at The Needles, Isle of Wight, at Bournemouth and later at the Haven Hotel, Poole, Dorset.
In 1900 he took out his famous patent No. 7777 for "tuned or syntonic telegraphy" and, on an historic day in December 1901, determined to prove that wireless waves were not affected by the curvature of the Earth, he used his system for transmitting the first wireless signals across the Atlantic between Poldhu, Cornwall, and St. John's, Newfoundland, a distance of 2100 miles.
Between 1902 and 1912 he patented several new inventions. In 1902, during a voyage in the American liner "Philadelphia", he first demonstrated "daylight effect" relative to wireless communication and in the same year patented his magnetic detector which then became the standard wireless receiver for many years.
In December 1902 he transmitted the first complete messages to Poldhu from stations at Glace Bay, Nova Scotia, and later Cape Cod, Massachusetts, these early tests culminating in 1907 in the opening of the first transatlantic commercial service between Glace Bay and Clifden, Ireland, after the first shorter-distance public service of wireless telegraphy had been established between Bari in Italy and Avidari in Montenegro.
In 1914 he was commissioned in the Italian Army as a Lieutenant being later promoted to Captain, and in 1916 transferred to the Navy in the rank of Commander.
Marconi Wireless Installation in the Titanic
Titanic’s wireless set had a 1.5-kW marine set installed at that time in most ships serviced by the Marconi’s Wireless Telegraph Company, Ltd.
Had a nominal working range of 250 nautical miles, but signaling more distant stations was possible.
At night, ranges of up to 2,000 miles were attained.
The use of the "T" type aerial afforded greater power and sensitivity , so optimized performance could be expected when the ship was pointed either toward or away from a distant station.
More details here.. http://marconigraphtitanic/wireless/mgy_wireless.html
FCC & the first AMPS system
Though the cellular technology was submitted to FCC in 1968, only in 1983, FCC allowed 666duplex channels (40 Mhz of spectrum in the 800 Mhz band, each channel having a one-way bandwidth of 30 khz for a spectral occupancy of 60 khz for a channel)
According to FCC rules, each city can have only 2 service providers
Radio channels were equally split between the 2 carriers
In 1989, the FCC granted additional 166 channels (10 Mhz) to accommodate the rapid demand
U.S. Advanced Mobile Phone System (AMPS)
[attachment=38301]
Wireless
Ability to communicate with people on the move
Guglielmo Marconi demonstrated radio ability to contact with ships sailing the English channel in 1897!
Past 10 years the wireless usage has skyrocketed, making portable radio more smaller, cheaper, and more reliable
Digital switching has facilitated large deployment with affordable cost
This trend will continue even at a greater pace during the next decade!!
Marconi & wireless
Marconi was born at Bologna, Italy in 1874 (Italian father & Irish mother).
In 1895 he began laboratory experiments at his father's country estate at Pontecchio where he succeeded in sending wireless signals over a distance of one and a half miles.
In 1896 Marconi took his apparatus to England where he was introduced to Mr. (later Sir) William Preece, Engineer-in-Chief of the Post Office, and later that year was granted the world's first patent for a system of wireless telegraphy. He demonstrated his system successfully in London, on Salisbury Plain and across the Bristol Channel.
In July 1897 formed: The Wireless Telegraph & Signal Company Limited (in 1900 re-named Marconi's Wireless Telegraph Company Limited). In the same year he gave a demonstration to the Italian Government at Spezia where wireless signals were sent over a distance of twelve miles.
In 1899 he established wireless communication between France and England across the English Channel. He erected permanent wireless stations at The Needles, Isle of Wight, at Bournemouth and later at the Haven Hotel, Poole, Dorset.
In 1900 he took out his famous patent No. 7777 for "tuned or syntonic telegraphy" and, on an historic day in December 1901, determined to prove that wireless waves were not affected by the curvature of the Earth, he used his system for transmitting the first wireless signals across the Atlantic between Poldhu, Cornwall, and St. John's, Newfoundland, a distance of 2100 miles.
Between 1902 and 1912 he patented several new inventions. In 1902, during a voyage in the American liner "Philadelphia", he first demonstrated "daylight effect" relative to wireless communication and in the same year patented his magnetic detector which then became the standard wireless receiver for many years.
In December 1902 he transmitted the first complete messages to Poldhu from stations at Glace Bay, Nova Scotia, and later Cape Cod, Massachusetts, these early tests culminating in 1907 in the opening of the first transatlantic commercial service between Glace Bay and Clifden, Ireland, after the first shorter-distance public service of wireless telegraphy had been established between Bari in Italy and Avidari in Montenegro.
In 1914 he was commissioned in the Italian Army as a Lieutenant being later promoted to Captain, and in 1916 transferred to the Navy in the rank of Commander.
Marconi Wireless Installation in the Titanic
Titanic’s wireless set had a 1.5-kW marine set installed at that time in most ships serviced by the Marconi’s Wireless Telegraph Company, Ltd.
Had a nominal working range of 250 nautical miles, but signaling more distant stations was possible.
At night, ranges of up to 2,000 miles were attained.
The use of the "T" type aerial afforded greater power and sensitivity , so optimized performance could be expected when the ship was pointed either toward or away from a distant station.
More details here.. http://marconigraphtitanic/wireless/mgy_wireless.html
FCC & the first AMPS system
Though the cellular technology was submitted to FCC in 1968, only in 1983, FCC allowed 666duplex channels (40 Mhz of spectrum in the 800 Mhz band, each channel having a one-way bandwidth of 30 khz for a spectral occupancy of 60 khz for a channel)
According to FCC rules, each city can have only 2 service providers
Radio channels were equally split between the 2 carriers
In 1989, the FCC granted additional 166 channels (10 Mhz) to accommodate the rapid demand
U.S. Advanced Mobile Phone System (AMPS)