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CC3200MODLAUNCHXL: Radiotool maxing out at 14.5Mbps

Daniel Cho89
Intellectual 520 points
Part Number: CC3200MODLAUNCHXL
Other Parts Discussed in Thread: CC3200

Hello -

I did a simple demo with the CC3200 radiotool that was provided with no modifications and I realized that the throughput did not go higher than 14.5 Mbps.  For data rates lower than 14.5 Mbps, we get the corresponding throughput such as a 6Mbps data rate providing ~6Mbps throughput.  But with data rates greater than 14.5 Mbps such as 18, 36, 54, etc., it tops out at 14.5 Mbps.  What is preventing it from going higher than 14.5 Mbps?

The setup is two CC3200s with radiotool installed with one transmitting and one receiving.  The GUI is being used to configure and run the test.  I got the throughput by seeing how many packets were received in a 60s and used the formula: (# of packets) * (packet size) * 8 / 60

Thanks

  • 0
    TI__Guru 63006 points
    Hi Daniel,

    The Radio Tool puts the device in a transceiver and sends the test packets from the host through the network processor (NWP).
    This is limited by the SPI host interface bandwidth of 20 Mbps. Together with other overheads (this path was not optimized for high throughputs), the 14.5Mbps is reasonable.
    I'm not sure if your environment is quiet or loaded with other wifi-traffic/interference but the 20Mbps is the bottle neck that leads to maximum throughput of 16Mbps for UDP in optimal conditions (using standard socket and not the transceiver mode).

    Br,
    Kobi