Code-division multiplex communication transmitting apparatus and receiving apparatus and method thereof
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United States of America Patent
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Feb 8, 2005
Grant Date -
N/A
app pub date -
Oct 12, 1999
filing date -
Feb 25, 1999
priority date (Note) -
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Abstract
A phase .theta..sub.I1, . . . , .theta..sub.Q1, . . . uniquely determined for each channel is assigned to a carrier for each channel used when data I1 . . . , Q1, . . . , to be distributed among different channels are modulated. By appropriately modifying the phase of a carrier for each channel, signal points can be located in a narrower region than in a conventional region, and thereby the difference in amplitude between a signal point with a minimum amplitude and a signal point with a maximum amplitude can be reduced. Thus, the amplitude range of a signal to be covered by an amplifier for transmitting a transmission signal is reduced, and thereby an amplifier with a linearity that is not high can be used for the amplifier. Accordingly, even if the number of signal points increase, there is no need to use a large high-power amplifier, and thereby the small power and small size of the apparatus can be realized.
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