High BER with comm.RayTracingChannel when MaxNumReflections is Set to 0

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현준 양
현준 양 2024-7-13
回答： Aastha 2024-8-7
Hi,
I'm working on writing a code to evaluate BER using comm.RayTracingChannel. I'm referencing the example "Indoor MIMO-OFDM Communication Link Using Ray Tracing". In this example, when I set MaxNumReflections to 0, allowing only the direct path, the BER comes out to be close to 50%.
I don't understand why this happens. Realistically, in a chamber LOS environment, measuring BER should result in only a direct path and a very low BER. Why does the example produce such a high BER?
Any insights would be greatly appreciated.
Thanks.
  1 个评论
Umar
Umar 2024-7-13
Hi 현준 양,
Please see my comments below.
Realistically, in a chamber LOS environment, measuring BER should result in only a direct path and a very low BER. Why does the example produce such a high BER?
The communication link becomes more vulnerable to noise and distortion, which increases the likelihood of bit errors during transmission.
Realistically, in a chamber LOS environment, measuring BER should result in only a direct path and a very low BER. Why does the example produce such a high BER?
This is due to various factors such as noise, interference, channel impairments, and specific simulation parameters which could be contributing higher than expected BER values in the comm.RayTracingChannel.

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Aastha
Aastha 2024-8-7
Hi 현준 양,
I see that you are referencing the example ‘Indoor MIMO-OFDM Communication Link using Ray Tracing’ and you are getting a high BER close to 50% in a LOS chamber environment.
I tried to reproduce the issue using the same example and observed that a high pathloss can result in high BER.
As the pathloss is high, it results in the transmitted bits being lost in the environment which leads to decoding errors and a high BER.
Please refer to the image below to see pathloss value of 56.5350 dB.
Hope this helps!

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