10.4. Complementary Code Keying
Eight-chip Complementary Code Keying (CCK) is used as the modulation method for HRDSS (5.5 and 11 Mbps) transmissions. The CCK chip signaling rate is 11 MHz and is the same as that of DSSS. The signal bandwidth of CCK is therefore also 11 MHz and is compatible with DSSS systems. The HRDSSS basic packet format is the same as that of DSSS. An optional short packet format is also provided to reduce transmission overhead for 2-, 5.5-, and 11-Mbps rates. An optional HRDSSS packet binary convolutional coding (PBCC) modulation method can also be used in place of the CCK modulation.
10.4.1. Summary of 802.11b Standards
Two different preambles and headers are defined: the mandatory supported long preamble and header, which ...
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