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

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현준 양 2024-7-13

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https://ww2.mathworks.cn/matlabcentral/answers/2137088-high-ber-with-comm-raytracingchannel-when-maxnumreflections-is-set-to-0

回答： Aastha 2024-8-7，10:44

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.

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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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Answer 1

Aastha 2024-8-7，10:44

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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.