Ten-4. Back to you. Over. On a radio or over the TV airwaves, speakers have to rely on back-and-forth communications because radio traffic only flows in one direction at a time on a frequency. Or so said scientific conventional wisdom, until Stanford researchers developed so-called “full duplex” radios that can send and receive signals at the same time. Twice as fast as existing radio devices, the new technology promises less congested, more efficient networks. “Textbooks say you can’t do it,” said the technology’s principal investigator Philip Levis, assistant professor of computer science and of electrical engineering at Stanford.
When cellphones went from analog to digital, massive sound quality was lost as well as features. One of the features of the older analog cellphones was Full Duplex. They were exactly like talking on a landline. I was very involved in the technology and marketing of digital cell phones and cellular carriers literally lowered the quality more and more and more, to their surprise, consumers didn't complain! So today, that's why your cellphone communications sound like crap. It's sad. The companies didn't have to be so greedy. Originally, they were regulated by the government and were forced to maintain a certain level of quality, just like landlines were, but the Republicans wiped out all the regulations "the free market will keep the quality high" yeah, right! The whole point of government regulations are exactly this, to protect the naive population from the sophisticated tricks of the effing corporations!
Full Duplex is indeed nothing new. Lots of confusion could have been prevented had the author made it clear that this is Full Duplex over a SINGLE frequency, not a pair of frequencies. There are other technical errors but I suspect the author doesn't have much background in radio. Other work has been done on full duplex over a single frequency but lots of issues prevented it from being of practical use.
THATS STRANGE,I HAVE BEEN USING FULL AND HALF DUPLEX FOR THE LAST 25 YEARS ON 2 METERS & 70 CM
BAND.the Stanford professors better wake up.HAM RADIO OPERATORS DID THE DESIGN WORK ON FULL DUPLEX ABOUT 30 YRS AGO. IM TALKING VOICE & DATA.
Interesting idea. The approach of using dual transmit antennas to create a point of cancellation between the antennas would seem to be very frequency dependent and local environment dependent. The transmit signal might bounce off a nearby object, return at a different phase and interfere with the received signal. Would also seem that if the phase of the transmit signal is dynamically adjusted to account for local environment bounce, the result would be beam steering. If there is a cancellation point between the transmit antennas, one would expect some attenuation along a line perpendicular to the transmit antennas extending in both directions. Wonder how they are compensating for those problems.
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Researchers Muffle Radio Noise to Make WiFi Breakthrough
Posted by: Mike Martin February 17, 2011 07:00 AMTen-4. Back to you. Over. On a radio or over the TV airwaves, speakers have to rely on back-and-forth communications because radio traffic only flows in one direction at a time on a frequency. Or so said scientific conventional wisdom, until Stanford researchers developed so-called “full duplex” radios that can send and receive signals at the same time. Twice as fast as existing radio devices, the new technology promises less congested, more efficient networks. “Textbooks say you can’t do it,” said the technology’s principal investigator Philip Levis, assistant professor of computer science and of electrical engineering at Stanford.
BAND.the Stanford professors better wake up.HAM RADIO OPERATORS DID THE DESIGN WORK ON FULL DUPLEX ABOUT 30 YRS AGO. IM TALKING VOICE & DATA.
BOBFEINSTE