How can jamming be overcome?

How can jamming be overcome?

• A. Increase power of transmitted signal
• B. Spread spectrum signal spread over wider bandwidth
• C. Change to open freq
• D. Freq hopping cycling

Answer: (B)

Spreading the signal over a wider bandwidth makes jamming much harder because the jammer’s energy is spread over a larger spectrum, reducing the power density in any given frequency slice. At the receiver, despreading using the known spreading code concentrates the signal’s energy back into a narrow band, yielding a processing gain that significantly improves the received signal-to-noise ratio relative to the jammer. This combination provides robust resistance to interference, since the jammer would need vastly more power to overwhelm the spread signal. Merely increasing transmit power helps somewhat but doesn’t change the spectral characteristics or provide the same protection, and other approaches without the spreading/despreading gain are less effective.

Spreading the signal over a wider bandwidth makes jamming much harder because the jammer’s energy is spread over a larger spectrum, reducing the power density in any given frequency slice. At the receiver, despreading using the known spreading code concentrates the signal’s energy back into a narrow band, yielding a processing gain that significantly improves the received signal-to-noise ratio relative to the jammer. This combination provides robust resistance to interference, since the jammer would need vastly more power to overwhelm the spread signal. Merely increasing transmit power helps somewhat but doesn’t change the spectral characteristics or provide the same protection, and other approaches without the spreading/despreading gain are less effective.