mmWave (26GHz)


This setup allows experimentation of mmWave transmission on pioneer 26 GHz bands by using a pair of front ends with 16 beams. The antennas can be integrated to different USRPs, meaning that any system developed for these platforms can be investigated in the pioneer 5G mmWave bands.

More technical information about the 26 GHz frontend can be found here.

Setup

Below the setup is depicted, where the same components are used in both transmitter and receiver:

Below it follows the description of the individual components of the setup above.

1) Testbed Terminal: computer located at TUD's testbed that is connected to the software-defined radio (SDR). This computer can be remotely accessed in order to perform experiments with TUD's platforms, and depending on the user's needs, it can have a Windows image with NI LabVIEW Communications System Design Suite 2.0 or linux image with GNURadio and UHD. Further information is available at OWL Testbed.

2) SDR: in order to allow a variety of experiments, we have differnt SDR platforms available in the testbed, which are USRP B200 mini, USRP 2953, USRP N210 and USRP 2920. Further information can be found in OWL Testbed.

3) Switch: the 1x16 Mini-Circuits switch USB-1SP16T-83H is used as a beam selector for the mmWave antenna. The switch's input is connected to the SDR's output with carrier frequency of 2.4 GHz. The 16 switch's outputs are then connected 16 inputs of the multi-beam mmWave antenna. Since each input corresponds to a beam, we are able to select the antenna beam by selecting the switch's output port. The switch can be controlled by Python, Matlab, LabVIEW and other programming languages, information on software support and documentation can be found in Software and Documentation.

4) 26 GHz mmWave antenna: The multi-beam mmWave antenna is an antenna array with a 16 x 16 Butler matrix, that has 16 inputs, each one corresponding to a different beam, which is radiated at 26 GHz. The antenna is depicted below. In the left side we have the antenna from above, while in the right side we show the antenna from its front. One of the antenna's inputs is for the oscillator carrier signal with 11GHz.

5) Oscillator: this device produces the signal at 11 GHz to feed the antenna array. This signal is then split into two branches, such that both antennas at transmitter and receiver can use the same reference signal.