Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Digital I/Q modulator having a predistortion










Image Number 4 for United States Patent #7158582.

An I/Q modulator processes a time-discrete I/Q signal comprising an I component and a Q component. The I/Q signal is based on a sampling frequency which is equal to four times a carrier frequency of a carrier signal onto which the I/Q signal is modulated. A predistorter of the modulator predistort the I and components with a predistortion signal, which depends on the I and Q components, so as to form a predistorted I component and, in temporal alternation therewith, a predistorted Q components. An adjuster of the modulator adjusts the signs of the predistorted I and Q components so that two temporally successive predistorted components have a first sign and two additional successive predistorted components, which follow the first-mentioned components in time, have a second sign which is the inverse of the first sign, so as to produce therefrom an output signal at an output of the modulator.








 
 
  Recently Added Patents
Technique for skipping irrelevant portions of documents during streaming XPath evaluation
Method and apparatus for supporting delivery, sale and billing of perishable and time-sensitive goods such as newspapers, periodicals and direct marketing and promotional materials
Provision of downlink packet access services to user equipment in spread spectrum communication network
Low drop-out regulator providing constant current and maximum voltage limit
Portable electronic device holder and tether
Systems and methods for advertising on content-screened web pages
Apparatus and method for multiple pagings in broadband wireless communication system
  Randomly Featured Patents
Hydraulic drive for a feeder mechanism in a material pick-up device
Fitting with improved continuity
Vial autosampler with selectable modules
Semiconductor photodetector device with light responsive PN junction gate
Water cooled flue gas sampling device
Ldmos transistor with thick copper interconnect
Optimal call speed for call center agents
Systems and methods for delivering information to a communication device
Electrostatic latent image developing toner and method for producing the same, and electrostatic latent image developer, toner cartridge, process cartridge and image forming apparatus
System, method, and apparatus for improving the performance of ceramic armor materials with shape memory alloys