Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Quadrature modulation apparatus, method, program, and recording medium










Image Number 5 for United States Patent #7944989.

An RF signal, which has been obtained by a quadrature modulation, is corrected without performing quadrature demodulation. There are included an in-phase multiplier, a quadrature multiplier, an adder, a power detector, and an error determining part. The in-phase multiplier outputs an in-phase conversion signal by mixing an in-phase local signal of a predetermined local frequency with an in-phase correction user signal obtained by adding an in-phase user signal to an in-phase correction signal of a sinusoidal voltage outputted from an in-phase correction signal output unit. The quadrature multiplier outputs a quadrature conversion signal by mixing a quadrature local signal, which is different in phase by 90 degrees from the in-phase local signal, with a quadrature correction user signal obtained by adding a quadrature user signal to a quadrature correction signal, which is different in phase by 90 degrees from the in-phase correction signal, from a quadrature correction signal output unit. The adder adds the in-phase conversion signal to the quadrature conversion signal. The power detector measures an output voltage of the adder. The error determining part determines, based on the measurement result of the power detector, the error of the quadrature modulation.








 
 
  Recently Added Patents
Base station device and wireless communication method
Thermoplastic resin composition
Packet communication system and packet communication method, and node and user device
Method and system for associating a cell-sector with time-dependent location parameters
Co-map communication operator
System for determining potential lot consolidation during manufacturing
Sharing networks determined by sharing of items between individuals
  Randomly Featured Patents
MIM capacitor with enhanced capacitance
Apparatus for steam sterilization of articles
Programmable delay line compensated for process, voltage, and temperature
Positive collector electrode for batteries with alkaline electrolytes
Method of preparing a hydrotreating catalyst on a support containing a rare earth metal
Resistive structure for integrated circuits and method of forming same
Ethylene oxide process
Broom
Composite signal analog-to-digital converting device
Image signal processing method and image signal processing device