The maximum data rate of an HR DSSS PHY transmission is 11 Mbps.
The High Rate Direct Sequence Spread Spectrum (HR DSSS) physical layer is an enhanced version defined in the IEEE 802.11b standard, which increased data rates compared to earlier 802.11 implementations.
HR DSSS PHY Characteristics:
- Enhanced Data Rates: The primary improvement of HR DSSS over previous 802.11 versions is its ability to transmit data at higher speeds.
- Complementary Code Keying (CCK): HR DSSS utilizes a modulation technique called Complementary Code Keying. CCK divides the chip stream into 8-bit code symbols, which increases data throughput.
- Maximum Throughput: As mentioned, HR DSSS supports data transfer up to a maximum rate of 11 Mbps. This is significantly higher than the 2 Mbps offered by the older 802.11 standards.
- Backward Compatibility: 802.11b devices which operate using HR DSSS are often backward compatible with the older DSSS specifications, so they can also communicate with older 802.11 compliant devices, which operate up to 2 Mbps.
| Feature | HR DSSS | Older DSSS |
|---|---|---|
| Max Data Rate | 11 Mbps | 2 Mbps |
| Modulation | CCK | Various DSSS |
The increased data throughput via CCK allows for faster data transmission and improves network performance in compatible environments, specifically when using 802.11b.
