Efficient implementation for systems using CEOQPSK
US6301310A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1998 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Dec 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2082
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Circuitry for modulating the frequency of a carrier signal with data signals for high frequency radio transmission, which includes a MSK generator for generating a series of in-phase (I) signals and an associated series of quadrature (Q) signals corresponding to the data signals to be transmitted. A first shift register receives binary input from the I signals generated with the MSK generator, the binary input being indicative of the sign orientation of the generated I signals from the MSK generator. A second shift register receives binary input from the Q signals generated with the MSK generator, with the binary input being indicative of the sign orientation of the generated Q signals from the MSK generator. A first finite impulse response (FIR) filter is provided for summing a series of delayed binary input received from the I signals at the first shift register to generate filtered I signals, and likewise a second FIR filter is provided for summing a series of delayed binary input received from the Q signals to generate filtered Q signals. A local oscillator (LO) generates the carrier signal, and an I/Q modulator is used for modulating the phase shift of the LO signal according …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.