Mobile radio unit for use in dual-mode cellular communications system
US5822704A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Jan 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A mobile radio unit having all improved signal processing technique is disclosed. The unit is used in a dual-mode cellular communications system wherein analog and digital channels are used in combination. The mobile radio unit is provided with a front end whereat an incoming radio frequency signal is converted to a corresponding IF. An orthogonal detector is coupled to receive the IF signal and generates in-phase (I) and quadrature (Q) signals. These I and Q signals are respectively digitized by two analog-to-digital (A/D) converters which in turn produce I and Q digital data respectively. A digital signal processor is supplied with the I and Q digital data and demodulates the analog signal using one of the I and Q digital data when the mobile radio unit is using the analog channel while demodulating the digital channel using both the I and Q data when the unit is using the digital channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.