Full-Duplex Communications for Future Wireless Networks by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9789811529696
Publisher: Springer Singapore

5.6.2 Millimeter Wave

MmWave is an emerging technology that improves the spectral efficiency of wireless networks by exploiting an enormous amount of spectrum. In mmWave bands, the signals suffer from huge propagation loss and are sensitive to blockage, which requires highly directional beams in achieving high SINR (or high antenna gain) at the user. In the omni-directional case, the signal is transmitted in all directions and, as a result, interferes with all other terminals in the network. Therefore, focusing the signal to a certain direction reduces the number of terminals that are affected by the interfering signal, i.e., the terminals that lie in the transmitted direction. Furthermore, compared to the omni-directional case, the directed transmitted signal can achieve a longer distance with the same power and can also reach the receiver with a higher power. As the beamwidth decreases, the gain of the signal increases and the possibility of interfering with other terminals decreases.

Hence, combining the mmWave technology with FD technology reduces the self-interference significantly because a highly directional beam from a transmitter antenna has a weak LOS component suffering from higher attenuation towards its own receiver antennas. This would result in the uplink users transmitting with a reduced power leading to a reduction of the intra-cell UE-to-UE interference [76], which is dominant when compared with inter-cell UE-to-UE interference [22]. Furthermore, FD small cell-based networks can benefit from the employment of mmWave communications, since the distances that signals have to travel as well as the transmissions powers reduce, resulting in a reduced interference compared to legacy systems in microwave bands [77].

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.