Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1997-12-10
1999-10-05
Olms, Douglas W.
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
370206, 370335, 375261, 375296, H04J 1300
Patent
active
059635495
ABSTRACT:
Disclosed is a method for generating I/Q waveforms for transmission over a CDMA radio channel. The method includes steps of (a) summing, for each of a plurality N of channels, the state of I bits to form an Isum value having a sign bit, the state of Q bits to form a Qsum value having a sign bit, and a total number of active channels to form a channel sum value; (b) applying the Isum value and sign bit, the Qsum value and sign bit, and the channel sum value to an input of a multiplexer; and (c) time multiplexing the inputs to generate first and second sets of output bits. The first set of output bits includes a subset of the Isum value bits, a subset of the Qsum value bits, the I sign bit, and the channel sum value bits. The second set of output bits includes the subset of the Isum value bits, the subset of the Qsum value bits, the Q sign bit, and the channel sum value bits. A next step of the method sequentially applies the first and second sets of output bits to a lookup table memory device for sequentially outputting an I value and a Q value for application to a digital to analog converter for generating I/Q waveforms that are predetermined to reduce transmission power and distortion. In the preferred embodiment of this invention the lookup table memory uses the LSB of the channel sum value as the LSB of the I value and the LSB of the Q value.
REFERENCES:
patent: 5008900 (1991-04-01), Critchlow et al.
patent: 5414728 (1995-05-01), Zehavi
patent: 5499236 (1996-03-01), Giallorenzi et al.
patent: 5583853 (1996-12-01), Giallorenzi et al.
patent: 5812607 (1998-09-01), Hutchinson, IV et al.
Arthur Ronald B
Butterfield Lee A
Gibson, Jr. L Andrew
Perkins Steven B
Hom Shick
L-3 Communications Corporation
Olms Douglas W.
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