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Sparse Channels and CP Length

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David83

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Hello all,

I am working on sparse channels with frequency domain equalization (FDE), where the transmission is block-based, which is very similar in structure to OFDM, where each frame begins with a CP. The problem in sparse channels is that the channel impulse response (CIR) is very long, while just a small number of taps are non-zero. So, is there any paper dealing with this issue in particular? i.e.: is there any efficient method to reduce the number of CP length, and make it proportional to the number of non-zero taps instead of the number of taps?

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I am sorry, I know that compressive sensing is good for channel estimation, but what about the CP length? I mean in broadband channels, the delay spread may be spread over hundred of symbols, where most of the taps are zero. So, if you want to include CP proportional to the channel memory, then this will be very bandwidth inefficient. Now the question is: can we make the CP length using compressed sensing proportional to the number of non zero taps instead of the number of taps?

Thanks
 

Good question, i shall seek for answers myself.
 

If you find anything let me know please
 

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