DSSS spread method

DSSS is a spread spectrum modulation technique used for digital signal transmission over airwaves. It was originally developed for military use, and employed difficult-to-detect wideband signals to resist jamming attempts. It is also being developed for commercial purposes in local and wireless networks.

1. What is DSSS technique?
2. How can spreading be achieved in DSSS?
3. How does DSSS achieve bandwidth spreading?
4. What is the spreading factor in DSSS?

What is DSSS technique?

In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth.

How can spreading be achieved in DSSS?

The spreading code can be transmitted in multiple ways like Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), or more complex modulation schemes like Quadrature Amplitude Modulation (QAM).

How does DSSS achieve bandwidth spreading?

Direct Sequence Spread Spectrum (DSSS)

DSSS accomplishes its frequency spreading by transforming each bit into a distinct, longer sequence. For example, a single '1' bit might become a particular 11-bit sequence (00010011100).

What is the spreading factor in DSSS?

One of the most essential attributes of DSSS coding is the spreading factor, which is defined as the quotient of the chip rate and the bit rate. As suggested by the above characteristics, DSSS does not affect the transmission time for the same transmitted packet.