TJ Innovation

The mmWave OTA repeater is another example of UNC functionality.
mmWave communication is one of the great options for increasing data rates because
it provides a relatively wide service bandwidth.

Noise cancellation is quite essential for mmWave band applications as relatively large
number of repeaters should be installed as beamforming provides service to spot areas.

SS-RSRP and location information can be obtained by performing demodulation
on the input signal from the mmWave base station, uplink noise can be minimized
by implementing those algorithms to ensure that uplink signal of the repeater is radiated
under optimized conditions.

Master Unit (MU) of the DAS must be installed closely with the base station, it must be designed to
optimize the space of the base station when DAS is installed.

The number of RF ports between base stations and DAS depends on the number of carriers and
frequency bands available, and the MIMO structure, and the number of ports that support 5G
increases significantly.

The Multi-band DAS in the picture, supports 4G and 5G simultaneously, with a total of 14 RF ports.
Because the output of the base station is typically 43 dBm per port, while the DAS input port operates
near 0 dBm, an additional high-power attenuator must be installed in between.On the other hand,
existing high-power attenuators were forced to consume high-power RF signals, resulting
in inefficiencies that did not utilize the amplified RF signal power, and at the same time, additional
cooling devices are required at base stations to solve the heating problem.

Built-in POI DAS products greatly improve the space efficiency of base stations by adapting built-in POI.
In addition, it helps to reduce OPEX dramatically by applying MBMU which enables MU converts RF
to DC thanks to energy harvesting technology, utilizing high power RF signals as extra DC power
source for DAS.