Method for transmitting wideband signals via a communication system adapted for narrow-band signal transmission
US7483490B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2003 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | Jan 3, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/26
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication system is used to transmit and receive data on a plurality of relatively narrow-band signals and wideband signals. The two signal types share a common electromagnetic spectrum by employing spreading gain and maintaining orthogonality between simultaneously transmitted wideband and narrow-band signals. Signal orthogonality is maintained by selectively choosing orthogonal codes and aligning or spacing a wideband carrier frequency with respect to the narrow-band carrier frequencies in accordance with the ratio of the wideband to the narrow-band chip frequencies. A pilot signal is preferably transmitted contemporaneously with the transmission of the first spread signal, and a control date signal, associated with a plurality of users on the first bandwidth, is transmitted on a common control channel using a single Walsh code that is shared by a plurality of users in a TDMA protocol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.