Apparatus and method for digital wireless communications
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United States of America Patent
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May 18, 2004
Grant Date -
Oct 16, 2003
app pub date -
May 28, 2003
filing date -
Jan 19, 1999
priority date (Note) -
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Abstract
In a multivalue modulation type with one pilot symbol inserted for every 3 or more symbols, signal points of each one symbol immediately before and after a pilot symbol are modulated using a modulation type different from that for pilot symbols. In this way, it is possible to suppress deterioration of the accuracy in estimating the reference phase and amount of frequency offset by pilot symbols and improve the bit error rate characteristic in the signal to noise ratio in quasi-coherent detection with symbols whose symbol synchronization is not completely established.
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