Bit Transmission in DSSS
Each bit converted into a special code
- 8-bit or 11-bit code (designed to reduce interference)
- Called spreading a bit into many bits across spectrum
1-Mbps DSS
- Uses an 11-bit Barker sequence code
- Transmitted using binary phase shift keying (BPSK) (1 bit per symbol)
- 11 Mbps signaling rate ? 1 Mbps data rate
2-Mbps DSS
- Uses the same 11-bit code
- Transmits using Quadrature phase shift keying (QPSK) (2 bits per symbol)
- 11 Mbps signaling rate ? 2 Mbps data rate