Mobile communication system
US5436904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1993 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Aug 6, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present mobile communication system includes a base station (BAS) and at least one mobile subscriber station (MOB) having a modulator (COM, SPM, DPEM, QPSKM, KSM) able to modulate a carrier wave with a request for access signal, and a transmitter (A3, DCM, ANTM) to transmit the thus obtained modulated carrier wave to the base station (BAS) during a time slot of a time division multiple access structure (TDS). The modulator is a linear digital modulator (COM, SPM, DPEM, QPSKM, KSM) which, prior to modulating the carrier wave with the request for access signal, modulates a pre-access carrier wave in such a way that a substantially constant envelope output signal is obtained during a subslot (SS1/SS6) of a time slot (SI). In a further embodiment the mobile subscriber stations are arranged in groups, to which distinct groups of time slots of said time division multiple access structure (TDS) are assigned, and each of the mobile subscriber stations (MOB) is allowed to launch a request for access in a time slot of the assigned group only.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.