Code division multiple access unit and code division multiple ac

Details Code division multiple access unit and code division multiple ac Code division multiple access unit and code division multiple ac

1996-04-26

1998-02-24

Olms, Douglas W.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370441, 375206, H04B 7216

Patent

active

057217343

ABSTRACT:
The present invention comprises addition/subtraction means 101 to 107 and exclusive OR circuits 111 to 125. The addition/subtraction means performs addition (A+B: sub/add=0) or subtraction (A-B: sub/add=1) according to a logic value of the control terminal sub/add. The transmission amplitude signals amp0 to amp7 with a plural bits width are input to the addition/subtraction means 101 to 104 at each two channels. The exclusive OR 10 circuits 111 to 118 calculates an exclusive OR of the transmission data d0 to d7 and the spread code sequence signals c0 to c7. The resultant code sequence signals s0 to s7 are input to the control terminals sub/add's of the addition/subtraction means. The addition/subtraction means 108 at the last step inverts the code and outputs the spread synthesis signal sum spread with spread code sequence signal c0 to c7.

REFERENCES:
patent: 4425562 (1984-01-01), Pe Niet
patent: 4494228 (1985-01-01), Gutleber
patent: 4561089 (1985-12-01), Rouse et al.
patent: 4979183 (1990-12-01), Cowart

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