Spread Spectrum Techniques
A spread spectrum transmitter spreads the signals out over a wide frequency range using one of the following techniques:
- Direct sequence spread spectrum - spread spectrum broadcasts in bands where noise is prominent, but does not rise above the level of noise. Its radio signals are too weak to interfere with conventional radios and have fewer FCC (Federal Communications Commission) restrictions. Data is altered by a bit stream that represents every bit in the original data with multiple bits in the generated stream, thus spreading the signal across a wider frequency band.
- Frequency hopping spread spectrum - using this technique, the original data signal is not spread out, but is instead transmitted over a wide range of frequencies that change at split-second intervals. Both the transmitter and the receiver jump frequencies in synchronization during the transmission.