Comparison with FDMA 0.6 chI ch2 ch3 s04 802 Frequency guar -0.2 Subcarrier number k0 1 2 3 4 5 6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 Subcarrier Number k Spectra Comparison with FDMA ch1 ch2 ch3 Frequency guard