Spread spectrum signal demodulator
US4998261A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1989 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Dec 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/70712
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a digital data receiver (80) for demodulating a direct sequence spread spectrum differential phase shift keyed data signal, the signal is applied to the input transducer (140) of a SAW device (100) which has first and second output transducers (142, 144) spaced apart on the SAW substrate (130) so as to produce first and second output signals on output lines (102, 104), which are relatively delayed by a time corresponding to a symbol period. The output transducers are of identical construction and are matched to the spread spectrum code utilized in the data signal. Thus, a single SAW device (100) effects both correlation and delay. The output signals on the output lines (102, 104) are processed by a circuit including multipliers (106, 110) and a phase shifter (108) to produce output data signals representing the received data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.