These two basic technologies are digital transmissions (as opposed to analog transmissions). In digital transmissions there are only zeros and ones. So, it is fairly easy to reboost these signals worldwide through cell phone towers (microwave towers and satellites). The combination of Cell phone towers combined with mostly stationary satellites allow cell phones to both exist and work.
The 2nd major technology that allows cell phones and smartphones to work is GPS positioning satellites. Without this 2nd technology you couldn't match up the exact location within a few feet of any two (or more) cell phones or smartphones worldwide. So, by combining Digital transmissions that are easily boosted in power worldwide with GPS satellites that allow any two cell phones to talk worldwide you have your basic cell phone communication going worldwide now.
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The first satellite in the system, Navstar 1, was launched February 22, 1978. The GPS satellite constellation is operated by the 50th Space Wing of the United States Air Force. The GPS satellites circle the Earth at an altitude of about 20,000 km (12,427 miles) and complete two full orbits every day.
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The first digital cell phones were the second generation (2G) of cellular technology. Digital phones use the same radio technology as analog phones, but they use it differently. ... This compression allows between three and 10 digital cell phone calls to occupy the space of a single analog call.
In other words, in any cell, 56 people can be talking on their cell phone at one time. With digital transmission methods, the number of available channels ...
However, as the number of cell phone users grew, the cell providers realized they would soon run out of frequencies, so digital signals were introduced.
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Dec 20, 2014 - In the most basic form, a cell phone is essentially a two-way radio, consisting of a radio transmitter and a radio receiver. When you chat with your friend on your cell phone, your phoneconverts your voice into an electrical signal, which is then transmitted via radio waves to the nearestcell tower.
Jan 9, 2003 - Digital cell phones use extreme compression of the sound that they transmit. The compression algorithms used are lossy; they're specifically ...
Apr 2, 2018 - A simple introduction to cellphones (mobile phones) and how they work. ... the things you can do with a telephone, digital camera, MP3 player, GPS "sat nav," ..... the first person to transmit the human voice using radio waves.
