Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Year | Description |
| 2000 | Invention patented by John Noneman on December 6th, 2000. Abstract: Increased data rate transmission in the reverse traffic channel is obtained by modifying a core reverse CDMA traffic channel signal generator and modulator by creating a plurality of parallel pathways, each of which includes a Walsh modulator and a modulo-2 adder which direct-sequence spreads the modulated data using one of a plurality of modified long codes. The DS-spread data signals from each of the parallel pathways are summed and split to the I and Q channels for PN code spreading. The long code variations are obtained by varying one or more bits of the IS-95 standard public long code mask or private long code mask, specifically, one or more bits of the most significant bit (MSB) string of the public long code mask (bits M.sub.41 through M.sub.32). Generally, each variable bit provides two possible code channels--one Fundamental Code Channel and 2.sup.b -1 Supplemental Code Channels, where b is the number of bits that can be varied within the long code mask. In another embodiment, a multiplexer may be inserted into a core reverse channel sequence prior the PN spreading function to provide dual channel OQPSK that is consistent with existing IS-95 single channel OQPSK. Different levels of service can be selected using different codes and a plurality of multiplexers located in the error detection and encoding front end of the core reverse channel process sequence. |
| Source: selected by the editor from original sources. | |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
