OCQPSK modulator and modulating method using 1-bit input FIR filter
US6819708B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2000 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Nov 29, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2071
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A modulator for an IMT-2000 synchronous mobile station in a digital telecommunication and modulating method thereof, and more particularly, an OCQPSK modulator using FIR filters, each for performing 1:4 interpolation operations for 4 input data and a modulating method thereof. The orthogonal complex quadrature phase shift keying OCQPSK modulating apparatus uses a 1-bit input FIR filter that includes pseudo noise spreading for bifurcating 1-bit data inputted from input channels and pseudo-spreading the bifurcated 1-bit data, an FIR filter for receiving the 1-bit data and performing a filtering operation for pulse shaping, a gain multiplying block for multiplying filtered data outputted from the FIR filter by a gain for respective channels, and a channel adder block for adding data outputted from the gain multiplying block to output I channel and Q channel signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.