Sumitomo develops remote radio head for LTE base stations

Sumitomo Electric Industries has
developed a remote radio head (RRH) used in a cellular base station for LTE

With this RRH, Sumitomo Electric has
realized a wireless output power of 80 W at 2.1 GHz at a low power consumption
of less than 270 W, achieving the industry’s highest class efficiency.

The next generation wireless
broadband systems, such as LTE and WiMAX networks, have recently come into
practical use. In these systems, a new design scheme has been increasingly implemented,
where the wireless transceiver known as RRH is separated from the base
station to be placed beneath the antenna. This scheme has now become the
mainstream in this field.


Locating the RRH closer to the
antenna prevents the power loss caused while transmitting through a long
cable. Consequently, the amplifier output to the antenna is lowered, and the
total power consumption by the RRH is reduced.


Conventionally, the base station
main equipment needs to be installed near an antenna. With the independent
RRH, this is not required, effectively increasing the options for the

Sumitomo Electric
developed the RRH for a WiMAX base station in 2010. The Company has also
developed this year a new RRH for an LTE base station by incorporating a higher
efficiency power amplifier and the original pre-distorter. This newly developed
RRH demonstrates a wireless output of 80 W at a lower power consumption of less
than 270 W, achieving an improved efficiency of more than 30 percent.

By Team