Spread-spectrum GMSK/M-ary radio with oscillator frequency correction
US6760393B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2000 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | May 4, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0055
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication device includes a transmitter and receiver. The transmitter includes an M-ary encoder configured to generate an M−1 number of distinctive symbols each comprising k bits. M is equal to 2k and k is a positive integer. The transmitter also includes a code generator configured to produce spread spectrum codeword sequences based on the symbols generated by the M-ary encoder and based on a first and a second Gold code polynomials. The transmitter sends a radio signal based on the spread spectrum codeword sequences. The receiver is configured to receive the radio signal. The receiver includes a first shift register configured to receive an input signal generated based on the received radio signal and a second shift register configured to receive and circularly shift a locally generated codeword sequence that is identical to the codeword sequence used to encode the symbols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.