Composite spread spectrum signal including modulator demodulator
US5469469A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1993 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Dec 7, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/69
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A composite spread spectrum signal including modulator and demodulator therefor is disclosed. The composite signal having a multi-dimensional signal space, comprising a pulse position modulation dimension generated by varying starting positions of cyclically repeated chipping sequences, a frequency shift key dimension generated by varying a carrier frequency between a plurality of frequencies, code shift keyed dimensions generated by selecting the chipping sequences from among a plurality of orthogonal sequences, and amplitude shift key dimensions generated by selecting amplitudes of each subcarrier for each message bundle. This signal may further comprise a phase shift key dimension generated by assigning a phase relationship of the orthogonal subcarriers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.