 |
|
 |
| |
 |
|
Class Information
Number: 375/298
Name: Pulse or digital communications > Transmitters > Quadrature amplitude modulation
Description: Subject matter in which the transmitted signal can be represented as the superposition of two modulated signals, each being obtained by pulse amplitude modulation of a signal sequence on a sinusoidal carrier, the two signal sequences being generated in synchronization at the same rate, and the two carriers being of the same frequency but 90 degrees apart in phase.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7616701 |
Zero excess bandwidth modulation |
Nov. 10, 2009 |
| 7616702 |
Transmission circuit and communication apparatus comprising the same |
Nov. 10, 2009 |
| 7613250 |
Distortion compensation apparatus |
Nov. 3, 2009 |
| 7599714 |
Increasing the range of access point cells for a given throughput in a downlink of a wireless local area network |
Oct. 6, 2009 |
| 7599446 |
Modulation and demodulation based on hierarchical modulation |
Oct. 6, 2009 |
| 7596186 |
Devices and methods of modulation and demodulation enabling the extension or replacement of a communications link, corresponding sender and receiver |
Sep. 29, 2009 |
| 7586995 |
Peak windowing for crest factor reduction |
Sep. 8, 2009 |
| 7583894 |
Interferometric operation of electroabsorption modulators |
Sep. 1, 2009 |
| 7580684 |
Programmable radio transceiver |
Aug. 25, 2009 |
| 7573949 |
Transmitter circuit, transmission method, and communications device using the transmitter circuit |
Aug. 11, 2009 |
| 7570711 |
Quadrature LINC transmission method and apparatus |
Aug. 4, 2009 |
| 7570705 |
GMSK modulation using a dual-port memory |
Aug. 4, 2009 |
| 7570702 |
Signal generation apparatus, systems, and methods |
Aug. 4, 2009 |
| 7570699 |
QAM symbol mapping method and apparatus for downstream transmission of a cable modem |
Aug. 4, 2009 |
| 7570694 |
Backward compatible multi-carrier transmission system |
Aug. 4, 2009 |
| 7567622 |
Constellation rearrangement for ARQ transmit diversity schemes |
Jul. 28, 2009 |
| 7564922 |
RF transmitter for efficiently compensating output power variation due to temperature and process |
Jul. 21, 2009 |
| 7562280 |
Code design and implementation improvements for low density parity check codes for wireless routers using 802.11N protocol |
Jul. 14, 2009 |
| 7558331 |
Constellation rearrangement for transmit diversity schemes |
Jul. 7, 2009 |
| 7555051 |
Method and device for estimating IQ imbalance |
Jun. 30, 2009 |
| 7555061 |
Optical communication device |
Jun. 30, 2009 |
| 7548591 |
Quadrature modulator and calibration method |
Jun. 16, 2009 |
| 7545882 |
Transmission apparatus, reception apparatus and digital radio communication method |
Jun. 9, 2009 |
| 7539270 |
Method and apparatus to interleave bits across symbols from different constellations |
May. 26, 2009 |
| 7535975 |
QAM mapping and bit labeling or bit-interleaved coded modulation |
May. 19, 2009 |
| 7532679 |
Hybrid polar/cartesian digital modulator |
May. 12, 2009 |
| 7532673 |
Transport of modulation symbols in a communications system |
May. 12, 2009 |
| 7529522 |
Apparatus and method for communicating an input signal in polar representation |
May. 5, 2009 |
| 7518459 |
Harmonic-rejection modulation device |
Apr. 14, 2009 |
| 7515650 |
Quadrature modulation compensation |
Apr. 7, 2009 |
| 7515651 |
Parallel processing for programmable wideband digital modulation |
Apr. 7, 2009 |
| 7515648 |
Transmitter and wireless communication apparatus using same |
Apr. 7, 2009 |
| 7512387 |
Method and control system for controlling the output power of an RF amplifier system |
Mar. 31, 2009 |
| 7505531 |
Signal communications system and method for noisy links |
Mar. 17, 2009 |
| 7502423 |
Digital modulator and digital modulation method |
Mar. 10, 2009 |
| 7499503 |
Parallel concatenated code with soft-in soft-out interactive turbo decoder |
Mar. 3, 2009 |
| 7499696 |
Method to optimize hierarchical modulation for a diversity system |
Mar. 3, 2009 |
| 7496145 |
Method and apparatus for reducing transmitter peak power requirements with orthogonal code noise shaping |
Feb. 24, 2009 |
| 7492833 |
Method for digital wireless communications |
Feb. 17, 2009 |
| 7492832 |
Method and apparatus for digital vector QAM modulator |
Feb. 17, 2009 |
| 7483491 |
Linear transformation circuits |
Jan. 27, 2009 |
| 7474608 |
Method for signaling information by modifying modulation constellations |
Jan. 6, 2009 |
| 7471640 |
Scalable QAM system and method |
Dec. 30, 2008 |
| 7471741 |
Method, apparatus and system for high-speed transmission on fiber optic channel |
Dec. 30, 2008 |
| 7471740 |
ARQ retransmission with reordering scheme employing multiple redundancy versions and receiver/transmitter therefor |
Dec. 30, 2008 |
| 7471730 |
Transmitting method and transmitting apparatus |
Dec. 30, 2008 |
| 7471620 |
Method for the selection of forward error correction (FEC)/ constellation pairings for digital transmitted segments based on learning radio link adaptation (RLA) |
Dec. 30, 2008 |
| 7469020 |
Systems, methods, and apparatus for reducing dynamic range requirements of a power amplifier in a wireless device |
Dec. 23, 2008 |
| 7460612 |
Method and apparatus for a fully digital quadrature modulator |
Dec. 2, 2008 |
| 7460606 |
VSB transmission system |
Dec. 2, 2008 |
|
|
|
 |
|
 |
|
| |
Randomly Featured Patents |
|
