QBL-MSK mapping for time of arrival (TOA) applications
US7773696B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 2006 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Jun 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/709709
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmitter is configured to transmit a time of arrival (TOA) message to a receiver applying a quadrature multiple frequency ranging (QMFR) algorithm for separating multiple path signal components. The transmitter includes (1) a modulator for generating a quasi-band limited minimum shift keyed (QBL-MSK) signal, (2) a serial formatter for generating a serial QBL-MSK (SQBL-MSK) signal, and (3) a switch for disabling the serial formatter, during a time that the TOA message is being transmitted to the receiver. The receiver includes (1) a matched filter for separating a data packet with the TOA message into in-phase (I) and quadrature (Q) spreading sequences, (2) an even sample mapping section, coupled to the matched filter, for outputting the even samples of the I and Q spreading sequences, (3) an odd sample mapping section, coupled to the matched filter, for outputting the odd samples of the I and Q spreading sequences, and (4) sliding correlator banks for receiving the even samples of the I and Q spreading sequences and the odd samples of the I and Q spreading sequences and outputting despread even I and Q samples and despread odd I and Q samples to a QMFR algorithm for separating…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.