Coherent tracking apparatus and method for CDMA receiver
US5898665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1996 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Aug 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/709
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A coherent tracking apparatus for a CDMA receiver capable of achieving high accuracy tracking by suppressing noise. It includes a demodulation correlator for detecting correlation between a received spread signal and a demodulation spreading code replica inphase with a received spreading code included in the received spread signal by multiplying them, an absolute coherent detector for demodulating information data through absolute coherent detection of the correlation signal (despread signal) fed from the demodulation correlator, a tracking correlator for detecting correlation by multiplying the received spread signal by a pair of tracking spreading code replicas whose phases are shifted by .+-.1/2 chip period from the phase of the demodulation spreading code replica, a decided code corrector for performing reverse modulation of the difference (phase error signal) between the outputs of the tracking correlators with the output of the absolute coherent detector to remove modulated components of the information data included in the phase error signal, and a spreading code replica generator for generating the demodulation spreading code replica and the tracking spreading code replicas…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.