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hi what does this statement means " The modem uses 16 tones and are QPSK modulated in 3-3400Hz bandwidth". is that means 16 frequencies are marked as I and rest 16 as Q or 8 frequencies marked as I and 8 marked as Q .   Lets say i have 16 frequencies 600hz-1200hz with 40 Hz separation. can i modulate the same signal at baseband using I and Q signals . secondly what is the aprroximate formula for measuring the baudrate to 0.01% resoultion   Moinuddin

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