Spread-time code division multiple access technique with arbitrary spectral shaping
US5177768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1992 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jun 22, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A spread-time code division multiple access (ST-CDMA) technique is disclosed for bandlimited access to a channel. With ST-CDMA, pseudo-random (PN) sequences are assigned to each transmitter in the multi-transmitter system, and the Fourier transform of the transmitter pulse for a given transmitter is determined by modulating the phase of the desired transmitter spectrum by the PN sequence assigned to the transmitter. The data symbols produced by the transmitter are conveyed by delayed versions of the transmitter pulse. The transmitted data for a particular transmitter is recovered at a receiver synchronized to the transmitter by sampling the output of a filter matched to the corresponding transmitter pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.