Measurement Setup

The objective of this SDC is to design a DPD algorithm appropriate to linearize 2-channel MIMO transmitter with cross-coupling effect. The complete transmitter chain to be linearized comprises the following devices and instrumentation:

• Two GaN HEMT based PAs designed for MIMO transmitter.
• Commercial couplers.
• Vector signal generator, or Wideband direct RF/uW arbitrary waveform generator (AWG), or Wideband I/Q AWG and modulator (depending on the specific instrumentation made available by the equipment sponsor).
• Signal analyzer.

The participants will be able to remotely (via the web) upload 1) the predistorted envelope signals (baseband I/Q signals) and 2) supply wave to the corresponding signal generators (taking into account of the necessary delay compensation between both I/Q and supply signals). The PA response will be retrieved by the signal analyzer. The scoring results will be also provided. The participants’ DPD algorithms will be run off-line, similarly to the earlier editions of the DPD-Competition, and a realization of the target input signal used in the competition will be made available to the participating teams. A realistic orthogonal frequency division multiplex (OFDM) telecommunications signal will be used as input, which will cover a significant part of the PAs’ available bandwidth.

Through a dedicated web site(THUWebLab), the participating students will be able to test and essay their algorithms with the hardware setup, by remotely uploading the input predistorted signals and supply waves, and capturing the respective output signals. Both the web site and the input signal format to be considered in the DPD-Competition will be made available well in advance to the competition.

In the DPD-Competition, to be held in the IMS-2019, the same hardware test setup (or other samples of the same devices) will be made available to the participating students, where they will be able to tune their DPD algorithms and upload their predistorted and supply signals. Each team will have a period of 15 minutes to tune its DPD model. When ready (or at the end of that 15 minutes period) the target input signal will be given to the team and its DPD will generate the predistorted signals, which will be uploaded to the signal generators in different branches. At that moment, the jury will measure (and register) the performance metrics used to compute the overall score achieved by the team.