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Indeed, all information is lost at the spectral zero and the best strategy is to discard the noise present at this sub-carrier.
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However, this sub-carrier assignment is not optimal in the CRN, as we need to consider the constraint on PUs' rate loss for each sub-carrier.
After determining these parameters, the contribution of this sub-carrier can be added.
In cite [19], a similar scheme was presented using the sub-carrier pairing technique and AAF forwarding strategy only.
Any energy received at the sub-carrier exhibiting this spectral zero can therefore only be noise and the best any frequency-domain equalizer can do is to discard it.
As proposed in [7], this filter spans L RB-F-OFDM samples, with a passband of C sub-carriers, a stop-band starting at the Rth sub-carrier, a stop-band slope of γ and a sidelobe attenuation α.
For this case, the relay switches to the DAF technique at the i th sub-carrier having i ∈ D. The problem of the DAF relaying has been solved in [8].
At the transmitter, each sub-carrier is modulated using an M-point FFT.
In Section 2, we present the system model and the matching sub-carrier problem with a proposed algorithm.
At the receiver, a 2K−1 FIR equalization occurs on each sub-carrier at the output of the N-point FFT.
This one depends on the sub-carrier bandwidth and modulation.
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