OFDM interference

[huoxiaoyao]

Description

Adds

• an interference module in order to easily generate interference in the time or frequency domain
• a simple covariance estimator to estimate such interference from masked pilot symbols
• a rayleigh channel with multiple taps
• some convienience functions

• Fixes a bug?

No

• Adds a new feature?

See description above

• Introduces API changes?

No

• Other contributions

I have implemented the changes you suggested from the first review. The code does not yet contain a tutorial notebook - this is something we could add if you decide to use (part of) this PR.

Checklist

• Detailed description
• Added references to issues and discussions
• Added / modified documentation as needed
• Added / modified unit tests as needed
• Passes all tests
• Lint the code
• Performed a self review
• Ensure you Signed-off the commits. Required to accept contributions!
• Co-authored with someone? Add Co-authored-by: user@domain and ensure they signed off their commits too.

[jhoydis]

Hi @huoxiaoyao,

Thanks for this PR. We'll review it and come back to you. This might take a bit of time though.