See initScript.m for details on how the ZC-sequence is generated. Specifically, the Zadoff-Chu (ZC) sequence portion of the synchronizing sequence is used for loopback delay estimation. This subsystem is based on correlating the result of a magnitude difference function applied to the received and reference waveforms. With the ADI RF SOM connected to your host and with the TX1A and RX1A ports connected by a loopback cable, the first step in running the loopback delay estimation is finding the threshold value needed in the integer delay estimation piece of the model. Users can perform algorithmic processing on the obtained aligned data streams in the host computer or extend the design in the logic depending on their requirements.
#Loopback cable kit software
Since this example focuses on achieving tightly time aligned transmit and receive streams, the design will be built around logic for the FPGA fabric with software control interfaces. For instance, in a digital predistortion application where the transmit port of AD9361 is connected to the input port of a PA and the output of the PA is connected to the receive port of AD9361 (via an appropriately chosen attenuator), this design will help align the transmit and the receive streams. This design is useful when AD9361 is used as part of a hardware-in-loop test setup with transmit and receive ports connected to the input and the output of the device under test. This article will explain an example design that estimates the RF loopback delay when a transmit and a receive port of the AD9361 transceiver are connected using a cable.
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