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I am running a simulation with 100 Resource blocks for LTE OFDM and I plotted a PSD for it. Now I am able to bring down the out of band emissions when I perform an algorithm on it. Based on the improvement (bringing the OOBs down) how can I relate this to being able to increase the number of resource blocks(active frequencies). Since the OOBs are considerably lower, can I insert a few more RBs while not messing up the adjacent channel. Is there way or am I asking for too much ?

PS. Attaching a figure to show improvement. This is a PSD plot for 2048 FFT on a OFDM symbol and windowed OFDM. enter image description here

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