| 1. | The exact data capacity per channel depends on the modulation method used.
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| 2. | A modulation method specifies how the radio signal fluctuates to convey information.
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| 3. | AM was the earliest modulation method used to transmit voice by radio.
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| 4. | This was quickly supplanted by digital modulation methods to achieve even greater spectral efficiency.
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| 5. | Non-coherent modulation methods do not require a receiver reference clock signal that is asynchronously transferred.
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| 6. | "' 8VSB "'is the modulation method used for broadcast in the ATSC digital television standard.
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| 7. | However, ISO / IEC 18092 ( Near Field Communication ) uses some similar modulation methods.
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| 8. | Moreover, it goes on to define four physical layers depending on the modulation method used.
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| 9. | OFDM is a frequency-division multiplexing ( FDM ) scheme used as a digital multi-carrier modulation method.
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| 10. | Triangulations from this angle gave results for the height of reflection compatible with the frequency modulation method.
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