G. FULL DUPLEX RADIOS
For a long duration of communication period, it is assumed in
the wireless system design that radios have to operate in half
duplex mode. It means that it will not transmit and receive
simultaneously on the same channel. Many scholars, academics
and researchers at different universities and research
groups have tried to undermine this assumption by proposing
many designs to build in-band full-duplex radios.
But the realization to build full duplex radio has a lot of
implications. The cellular networks will have to reduce their
spectrum demands to half as only a single channel is used
for achieving the same performance. As in LTE, for both
uplink and downlink, it uses equal width separate channels
for empowering radios to realize full duplex.
For communicating in the full duplex mode, the selfinterference
results from its own transmission to the received
signal has to be completely removed. Let us consider the case
of WiFi signals which are transmitting at 20dBm (100mW)
average power with the noise oor of around