Figure. 6 (a) Electrical beat square signal and Nyquist shaped signal with α = 0.25 (upper) and α = 1 (bottom) and RF spectrum of the Tx signal without and with Nyquist shaping at Rb = 1.25 Gb/s (b, d) and Rb = 2.5Gb/s (c, e) for α= 0.25 and α= 1.
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