Spread spectrum receiving apparatus
US6134262A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1997 |
| Grant date | Oct 17, 2000 |
| Priority date | — |
| Expiry date | Jul 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/707
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiving apparatus is disclosed which comprises: a receiving circuit for receiving a radio wave signal including a pilot signal and data signal respectively spectrum-spread and converting the received radio wave signal in a base band signal; a Doppler frequency prediction portion for predicting a Doppler frequency due to a fading; a correlation detector including pilot signal PN code generation circuit for detecting a correlation between the pilot signal in the base band signal and a pilot signal PN code from the pilot signal PN code generation circuit every data length of the pilot signal; a correlation length changing portion for outputting a portion of the detected correlation with a length of the portion of the detected correlation varied in accordance with the Doppler frequency from the Doppler frequency prediction portion; and a demodulator for demodulating the base band signal to detect and output the data signal with a distortion of the data signal due to the fading compensated in accordance with the portion of the detected correlation. The length of the portion of the detected correlation is varied by a switch circuit or a weighting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.