Modulation Schemes
The system uses a multilevel modulation scheme to maximize the use of the air link. If the link condition allows, a more complex modulation scheme can be used to maximize throughput while providing a reliable data communication path. Because of environmental factors, if the air link degrades, the system reverts to less-complex modulation schemes, thus retaining reliable data communication. In the downlink, the BS supports QPSK, 16-QAM, and 64-QAM; and in the uplink direction, modulation used by the SS is variable and is in turn set by the BS. Even though QPSK is the recommended modulation for the SS, 16-QAM and 64-QAM are also supported if the link condition permits. The sequence of modulation bits that are mapped onto a sequence ...
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