Digital communication system modulated signal generation apparatus incorporating fading simulator
US6061394A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1997 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Nov 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/3911
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital communication system modulated signal generation apparatus incorporates a fading simulator for adding fading to a signal to be transmitted to a device to be tested. A baseband signal generation unit generates a digital baseband signal at a predetermined clock rate, and sequentially outputs time information corresponding to the predetermined clock rate. A fading parameter generation unit receives the time information sequentially output from the baseband signal generation unit together with the digital baseband signal, and output a desired fading parameter set in advance in correspondence with the time information. A fading addition operation unit executes a fading addition operation for the digital baseband signal output from the baseband signal generation unit by using the desired fading parameter output from the fading parameter generation unit, and outputs a signal indicating the result. A digital/analog conversion unit D/A-converts the signal output from the fading addition operation unit. A quadrature modulation unit quadrature-modulates the signal converted by the digital/analog conversion unit, and outputs the quadrature-modulated signal as a modulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.