To send signals via radio channels, you should either:

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Multiple Choice

To send signals via radio channels, you should either:

The key idea is how to improve the signal-to-noise ratio (SNR) at the receiver. Noise power in a radio channel is proportional to bandwidth, so you can make the signal easier to detect by either raising the transmitted power (making the received signal stronger) or narrowing the channel bandwidth (reducing the amount of noise that gets through). Both approaches improve SNR and enable reliable reception. Increasing bandwidth without more power tends to worsen reception because more noise comes in, while decreasing power harms reception. So the best option is to either increase transmitter power or decrease bandwidth.

The key idea is how to improve the signal-to-noise ratio (SNR) at the receiver. Noise power in a radio channel is proportional to bandwidth, so you can make the signal easier to detect by either raising the transmitted power (making the received signal stronger) or narrowing the channel bandwidth (reducing the amount of noise that gets through). Both approaches improve SNR and enable reliable reception. Increasing bandwidth without more power tends to worsen reception because more noise comes in, while decreasing power harms reception. So the best option is to either increase transmitter power or decrease bandwidth.

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