Technique for increasing the data rate in a spread spectrum data link
October 4, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3831096 3875332 Time domain radio transmission system Method of transmitting data information in a mobile, cellular radio communication system Image signal compression encoding apparatus and image signal expansion reproducing apparatus Coded modulation for mobile radio Double rate oversampled interpolative modulators for analog-to-digital conversion Digital data modulation circuit having a DC component suppression function Communication system and apparatus using chip signals Method and apparatus for the modulation of spread spectrum radio signals InventorAssigneeApplicationNo. 134011 filed on 10/04/1993US Classes:375/145, Having specific signaling for code synchronization332/112, Pulse position, frequency, phase, or spacing modulator370/213, PULSE POSITION MODULATION375/239, PULSE POSITION, FREQUENCY, OR SPACING MODULATION375/309, Keying circuits375/368, Synchronizer pattern recognizers380/34Plural carrier frequenciesExaminersPrimary: Gregory, Bernarr E.Attorney, Agent or FirmInternational ClassesH04L 027/30H03C 007/00 AbstractA method for increasing the bit rate of a data link is to select two additional 31-bit chip code patterns that are orthogonal to the present two chip codes, and to each other. This method will not require any more bandwidth that the present 10 MHz used. This method suggests that each of the four chip code patterns are assigned a two bit value i.e.: 00, 01, 10, 11. At present, the two correlated chip codes represent data in a pulse position method. No information is transferred by determining which of the two chip codes actually correlated. This new method suggests each of the four chip code patterns will still perform the pulse position modulation and also provide two additional bits of data. These additional two bits of data will up the data rate of the link by 100 percent. Alternatively, the data rate may be increased by coding the datasuch that a reduction in duty cycle is realized as well as an increase in the data rate. Variations of the coding scheme avoid repeating a chip code in successive windows to reduce the effects of multipath propagation.Other References
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