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Some more information here: http://sing.stanford.edu/fullduplex/ http://sing.stanford.edu/fullduplex/ The problem with full duplex wireless comm. on the same
by nimrody 16y ago
Some more information here:
http://sing.stanford.edu/fullduplex/ http://sing.stanford.edu/fullduplex/
The problem with full duplex wireless comm. on the same frequency is that the transmitted signal is much stronger than the received signal. Therefore, echo cancelling is usually impractical.
Not sure how these guys overcame the difficulties with transmitter nonlinearities and other unknown impairments.
EDIT: they claim to do partial cancellation by placing the receiver antenna at the null of the two transmitting antennas (getting 50 dB reduction in echo power). Whether this is practical in a commercial low cost radio remains to be seen.
- VladRussian 16y agoit may be practical in the office setup where 6+ antenna phased arrays Wi-Fi switches are "cost-practical". With phased array you have much more geometrical flexibility - you may "narrow beam" transmission to a client while better adjusting the transmitter's null onto the receiver's physical location to the current conditions, reflections, etc...
- reemrevnivek 16y agoNo, I think that the parent post was referring to the transmitters on the radio device. The transmitting and receiving antennas are different, and they place the receiving antenna in a null of the transmitters. This is easy and practical because they're in a location which is fixed by the PCB/housing. There's no phased array required.