RF channel simulator
US6058261A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1994 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Oct 27, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/0087
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method and a simulator for simulating an RF channel between a radio transmitter and a radio receiver located at a far distance from one another, in which radio channel multipath propagation occurs, and with which simulation at least part of the phenomena caused by the multipath propagation to the radio signal, such as delay spread, attenuation and Doppler shift are implemented. As taught by the method, an RF signal (f.sub.in) is moved to a lower frequency (f.sub.IF), and from said lower frequency signal (f.sub.IF) thus produced samples are taken and written in a memory at a predetermined write frequency (f.sub.w). The stored samples are read from the memory after a period of time of the length of the propagation delay (t.sub.Di) of each propagation path (i) to be simulated from the storage in the memory at a read frequency (f.sub.Pi) predetermined for each propagation path (i) to be simulated, said read frequency differing from the write frequency (f.sub.w), when the frequency difference (.DELTA.f.sub.01) of said write frequency (f.sub.w) and the propagation-specific read frequency (f.sub.Ri) represent the Doppler shift of the frequency occurring …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.