TRANSMIT PSD CEILING IN PACKET-BASED OFDM SYSTEMS
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United States of America Patent
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Issued Date -
Apr 7, 2011
app pub date -
May 20, 2010
filing date -
Aug 25, 2008
priority date (Note) -
Abandoned
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Abstract
Adjusted maximum transmit PSD levels have an effect on the SNR. If the ADC noise is assumed to be the limiting factor, then there can be a benefit for reducing the maximum transmit PSD level. For example, by lowering the maximum transmit PSD level from −50 dBm/Hz to −70 dBm/Hz results in an increase in SNR for subcarriers above 30 MHz. The SNR for subcarriers above 30 MHz can increase from 30 db (−80−(−110)) to 50 db (−80−(−130)). Therefore, by changing the maximum transmit PSD level, applying a ceiling on PSD mask, the aggregate sum of the available SNR's over the available subcarriers is increased, therefore increasing the obtainable OFDM data rate. In other words, a maximum transmit PSD mask can be used to lower the transmit PSD value of at least one subcarrier which results in an increase in SNR for at least one subcarrier.
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