Asymmetric adaptive modulation in a wireless communication system
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United States of America Patent
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Apr 15, 2003
Grant Date -
Mar 6, 2003
app pub date -
Aug 24, 2001
filing date -
Aug 24, 2001
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Abstract
On embodiment of the system and method provides asymmetric adaptive modulation which allows uplink and downlink subframes of data to be transmitted between a base station and a CPE with different modulation schemes, thus increasing the efficiency of downlink transmissions while maintaining the stability of uplink transmissions. In systems with multiple CPEs, each CPE and base station pair can independently select their uplink and downlink modulation techniques. The system and method are also adaptive in that they adjust the modulation schemes based on, for example, signal to noise ratio measurements or bit error rate measurements.
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