Modulation Need

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Modulation necessary primarily to:

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Modulation is necessary for several reasons:
1. **Antenna Size**: For efficient radiation, the antenna size should be comparable to the wavelength $\lambda = c/f$. High-frequency signals (low $\lambda$) require practical antenna sizes, whereas baseband signals (low frequency, high $\lambda$) would require антенн kilometers long.
2. **Bandwidth Sharing**: Allows multiple signals to be transmitted simultaneously using different carrier frequencies (Multiplexing).
3. **Power Efficiency**: High-frequency signals can be radiated more effectively into space. By shifting the baseband signal to a high-frequency carrier, we achieve efficient long-distance communication.

Modulation Need

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