Code-division multiplex communication transmitting apparatus...

Details Code-division multiplex communication transmitting apparatus... Code-division multiplex communication transmitting apparatus...

2005-02-08

2005-02-08

Kincaid, Lester G. (Department: 2685)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C370S320000, C370S441000, C370S335000

Reexamination Certificate

active

06853631

ABSTRACT:
A phase θI1, . . . , θQ1, . . . 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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