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Class Information
Number: 375/264
Name: Pulse or digital communications > Systems using alternating or pulsating current > Plural channels for transmission of a single pulse train > Quadrature amplitude modulation > Multilevel
Description: Subject matter in which the transmitted pulse waveform has more than two discrete amplitude levels.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7570694 |
Backward compatible multi-carrier transmission system |
Aug. 4, 2009 |
| 7555053 |
Long training sequence for MIMO WLAN systems |
Jun. 30, 2009 |
| 7532563 |
Mechanism to improve quality of channel estimates in OFDM transmissions |
May. 12, 2009 |
| 7515653 |
Digital broadcasting receiver, driving method thereof, and self-diagnosis method thereof |
Apr. 7, 2009 |
| 7505522 |
Spectral shaping in multiband OFDM transmitter with clipping |
Mar. 17, 2009 |
| 7505524 |
Receiver device and communication system |
Mar. 17, 2009 |
| 7489744 |
Turbo decoding method and apparatus for wireless communications |
Feb. 10, 2009 |
| 7480342 |
Soft value calculation for multilevel signals |
Jan. 20, 2009 |
| 7447354 |
Image transmitter, image receiver, and image transmitting system |
Nov. 4, 2008 |
| 7421033 |
Method for improving the performance of a coding in a radio communications system |
Sep. 2, 2008 |
| 7391816 |
Decoding upstream V.92-encoded signals |
Jun. 24, 2008 |
| 7362815 |
Time-reversal block transmit diversity system for channels with intersymbol interference and method |
Apr. 22, 2008 |
| RE40241 |
Communication system |
Apr. 15, 2008 |
| 7355532 |
voltage level coding system and method |
Apr. 8, 2008 |
| 7339502 |
Method and device for transmitting data over a plurality of transmission lines |
Mar. 4, 2008 |
| 7324611 |
Symbol decision adjustment in demodulator |
Jan. 29, 2008 |
| 7277495 |
Data communication |
Oct. 2, 2007 |
| 7272192 |
Time-reversal block transmit diversity system for channels with intersymbol interference and method |
Sep. 18, 2007 |
| 7230994 |
Multi-level modulation apparatus, multi-level demodulation apparatus, multi-level modulation/demodulation communication system, program and modulation/demodulation method |
Jun. 12, 2007 |
| 7221711 |
Multilevel data encoding and modulation technique |
May. 22, 2007 |
| 7212595 |
Reduced complexity time-frequency trained equalizer for discrete multi-tone based DSL systems |
May. 1, 2007 |
| 7206352 |
ATSC digital television system |
Apr. 17, 2007 |
| 7203461 |
Adaptive channel quality estimation algorithm to support link adaptation |
Apr. 10, 2007 |
| 7190737 |
Multi-mode block-coded modulation/demodulation method |
Mar. 13, 2007 |
| 7187728 |
Coding method and use of a receiver with a convolutional decoder |
Mar. 6, 2007 |
| 7180967 |
Coding apparatus and coding method |
Feb. 20, 2007 |
| 7167110 |
Multi-level communication system and method with error correction |
Jan. 23, 2007 |
| 7151804 |
System and method for reducing the peak power in multi-carrier modulation |
Dec. 19, 2006 |
| 7142616 |
Front end processor for data receiver and nonlinear distortion equalization method |
Nov. 28, 2006 |
| 7088784 |
Coded modulation for partially coherent systems |
Aug. 8, 2006 |
| 7016658 |
Apparatus and method for transmitting/receiving data according to channel condition in a CDMA mobile communication system with antenna array |
Mar. 21, 2006 |
| 6990155 |
Wireless quadrature modulator transmitter using E/O and O/E connectives |
Jan. 24, 2006 |
| 6925129 |
Method and circuit arrangement for improved data transmission |
Aug. 2, 2005 |
| 6909755 |
Method and system for increasing data throughput in communications channels on an opportunistic basis |
Jun. 21, 2005 |
| 6891896 |
Embedded signal constellations |
May. 10, 2005 |
| 6801579 |
Method and wireless communication using unitary space-time signal constellations |
Oct. 5, 2004 |
| 6731692 |
Symbol encoding and decoding architecture for trellis-coded modulation in gigabit ethernet |
May. 4, 2004 |
| 6727772 |
Method and system for synchronizing a quadrature amplitude modulation demodulator |
Apr. 27, 2004 |
| 6717990 |
Communication system and method for multi-rate, channel-optimized trellis-coded quantization |
Apr. 6, 2004 |
| 6704368 |
Coding and modulation method and apparatus for its implementation |
Mar. 9, 2004 |
| 6633614 |
Multicarrier personal access communication system |
Oct. 14, 2003 |
| 6614851 |
Efficient algorithm for blind detection of signal constellation |
Sep. 2, 2003 |
| 6614852 |
System for the estimation of the complex gain of a transmission channel |
Sep. 2, 2003 |
| 6577684 |
TRANSMISSION/RECEPTION METHOD AND DEVICE WHERE INFORMATION IS ENCODED AND DECODED ACCORDING TO RULES DEFINED BASED ON A RELATION BETWEEN A PREVIOUSLY-GENERATED MULTILEVEL CODE AND A CURRENTLY |
Jun. 10, 2003 |
| 6535554 |
PCS signal separation in a one dimensional channel |
Mar. 18, 2003 |
| 6532267 |
Variable rate constellation precoding |
Mar. 11, 2003 |
| 6529558 |
Coding and decoding a signal modified in accordance with the feedback states of an encoder |
Mar. 4, 2003 |
| 6516037 |
Multilevel coding with time diversity |
Feb. 4, 2003 |
| 6456667 |
METHOD OF CODING SIGNAL FOR DIGITAL OPTICAL COMMUNICATION HAVING SPECTRUM WHICH ATTAINS ZERO LEVEL AT PRESCRIBED FREQUENCY WITHIN MAIN LOBE BAND, BASEBAND TRANSMITTER OR ASK TRANSMITTER USING |
Sep. 24, 2002 |
| 6438174 |
Multi-carrier transmission systems |
Aug. 20, 2002 |
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