Timing signal correction system for use in direct sequence spread signal receiver
US4653076A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1984 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Mar 23, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A direct sequence spread spectrum transmitter and receiver can be synchronized when the timing reference frequency is less than or equal to the data sampling rate and the ratio of the data sampling rate to the timing reference is an integer by combining two, four or eight consecutive data samples to yield one data sample point. By combining these data samples, an optimum data sample point may be determined while receiving an alternating sign preamble by comparing the magnitudes of all possible summations and selecting the sample which gives a maximum output. If each sample is assigned to its own synchronization point, then synchronization may be accomplished by locking to the time that gives the maximum output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.