What spread spectrum communications technique uses a high-speed binary bit stream to shift the phase of an RF carrier?
Frequency hopping
Direct sequence✓Ճիշտ պատասխան
Binary phase-shift keying
Phase compandored spread spectrum
Բացատրություն
In direct sequence spread spectrum a fast pseudorandom bit stream, the chipping code, phase-modulates the carrier, so the occupied bandwidth is set by the chip rate rather than by the data rate. Frequency hopping spreads the signal by moving the carrier between channels instead, without phase shifting.