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Class Information
Number: 375/269
Name: Pulse or digital communications > Systems using alternating or pulsating current > Amplitude modulation > With phase or frequency shift keying
Description: Subject matter wherein the phase or frequency of the amplitude modulated carrier wave is shifted between at least two phases or frequencies.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7570697 |
Advanced MIMO interleaving |
Aug. 4, 2009 |
| 7564915 |
Apparatus and method for coding/decoding pseudo orthogonal space-time block code in a mobile communication system using multiple input multiple output scheme |
Jul. 21, 2009 |
| 7564908 |
Method and apparatus for encryption of over-the-air communications in a wireless communication system |
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 |
| 7529312 |
Layered modulation for terrestrial ATSC applications |
May. 5, 2009 |
| 7512188 |
Phase shift keying signaling for integrated circuits |
Mar. 31, 2009 |
| 7469491 |
Transmitter predistortion circuit and method therefor |
Dec. 30, 2008 |
| 7450715 |
Transceiver for bidirectional frequency division multiplexed transmission |
Nov. 11, 2008 |
| 7443920 |
Frame-based carrier frequency and phase recovery system and method |
Oct. 28, 2008 |
| 7433428 |
Method of reducing the variance of the signal-to-noise rate estimated for a signal with amplitude differential phase-shift keying modulation |
Oct. 7, 2008 |
| 7434136 |
Method of and apparatus for reading recording medium, harddisk controller |
Oct. 7, 2008 |
| 7424662 |
Method and system for providing low density parity check (LDPC) encoding |
Sep. 9, 2008 |
| 7409002 |
Signal modulation |
Aug. 5, 2008 |
| 7382717 |
Method for generating better than root raised cosine orthogonal frequency division multiplexing (BTRRC OFDM) |
Jun. 3, 2008 |
| 7349488 |
Frequency shift keying signaling for integrated circuits |
Mar. 25, 2008 |
| 7342976 |
Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter |
Mar. 11, 2008 |
| 7330703 |
Transceiver for bidirectional frequency division multiplexed transmission |
Feb. 12, 2008 |
| 7269233 |
Algorithm of bit synchronization for a digital FSK correlation receiver |
Sep. 11, 2007 |
| 7260159 |
Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying (QPSK) or offset quaternary phase shift keying (OQPSK) |
Aug. 21, 2007 |
| 7248647 |
Radio telecommunications system operative by interactive determination of soft estimates, and a corresponding method |
Jul. 24, 2007 |
| 7239668 |
Coded digital modulation method for communication system |
Jul. 3, 2007 |
| 7191387 |
Method and apparatus for forward error correction |
Mar. 13, 2007 |
| 7181186 |
Mixer and frequency conversion apparatus for improving phase-mismatching |
Feb. 20, 2007 |
| 7162211 |
Methods and apparatus for transmitting information between a basestation and multiple mobile stations |
Jan. 9, 2007 |
| 7099399 |
Distortion-managed digital RF communications transmitter and method therefor |
Aug. 29, 2006 |
| 7079814 |
Estimation of movement |
Jul. 18, 2006 |
| 7065150 |
System and method for generating a root raised cosine orthogonal frequency division multiplexing (RRC OFDM) modulation |
Jun. 20, 2006 |
| 7049995 |
Method and apparatus for remote control transmission |
May. 23, 2006 |
| 6901246 |
Suppressed cycle based carrier modulation using amplitude modulation |
May. 31, 2005 |
| 6870435 |
Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture |
Mar. 22, 2005 |
| 6836515 |
Multi-modulation radio communications |
Dec. 28, 2004 |
| 6836181 |
FSK demodulation system |
Dec. 28, 2004 |
| 6778112 |
Adaptive decoding method and apparatus for frequency shift key signals |
Aug. 17, 2004 |
| 6751265 |
Method and system of amplitude modulation using dual/split channel unequal amplification |
Jun. 15, 2004 |
| 6680981 |
.pi./4 shift QPSK modulator and communication device |
Jan. 20, 2004 |
| 6625231 |
Adaptive phase demodulation |
Sep. 23, 2003 |
| 6621863 |
Equalizing apparatus combining amplitude error with squared envelope error according to variable weights |
Sep. 16, 2003 |
| 6553079 |
Digital modulator for angle and/or amplitude modulation |
Apr. 22, 2003 |
| 6553535 |
Power-efficient communication protocol |
Apr. 22, 2003 |
| 6512799 |
Digital communication system and method for increased bit rates |
Jan. 28, 2003 |
| 6487240 |
Apparatus for receiving and recovering frequency shift keyed symbols |
Nov. 26, 2002 |
| 6477153 |
Method and apparatus for using the sidelobe of a long range antenna for a short range communication link |
Nov. 5, 2002 |
| 6470055 |
Spectrally efficient FQPSK, FGMSK, and FQAM for enhanced performance CDMA, TDMA, GSM, OFDN, and other systems |
Oct. 22, 2002 |
| 6456672 |
Automatic frequency control communication system |
Sep. 24, 2002 |
| 6452977 |
Method and apparatus for AM compatible digital broadcasting |
Sep. 17, 2002 |
| 6411655 |
Systems and methods for converting a stream of complex numbers into an amplitude and phase-modulated radio power signal |
Jun. 25, 2002 |
| 6389080 |
Random phase shift keying |
May. 14, 2002 |
| 6385233 |
Unbalanced quadrature waveform |
May. 7, 2002 |
| 6381265 |
Field programmable modulator-demodulator arrangement for radio frequency communications equipment and method therefor |
Apr. 30, 2002 |
| 6366601 |
Variable rate spread spectrum communication method and apparatus |
Apr. 2, 2002 |
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