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Class Information
Number: 329/304
Name: Demodulators > Phase shift keying or quadrature amplitude demodulator
Description: Subject matter where the demodulator extracts the modulating signal from a signal which has undergone phase shift keying modulation or quadrature amplitude modulation.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5425057 |
Phase demodulation method and apparatus using asynchronous sampling pulses |
Jun. 13, 1995 |
| 5414383 |
Four quadrant multiplier circuit and a receiver including such a circuit |
May. 9, 1995 |
| 5414384 |
Demodulator for radio data signals |
May. 9, 1995 |
| 5414735 |
Method and apparatus for normalizing components of a complex signal |
May. 9, 1995 |
| 5408499 |
Multilevel code for transmission device |
Apr. 18, 1995 |
| 5394110 |
Demodulation system having adaptive matched filter and decision feedback equalizer |
Feb. 28, 1995 |
| 5386202 |
Data communication modulation with managed intersymbol interference |
Jan. 31, 1995 |
| 5381450 |
Technique for automatically detecting the constellation size of a quadrature amplitude modulated (QAM) signal |
Jan. 10, 1995 |
| 5379323 |
DQPSK delay detection circuit |
Jan. 3, 1995 |
| 5371471 |
Low complexity adaptive equalizer radio receiver employing direct reference state updates |
Dec. 6, 1994 |
| 5367536 |
Parallel transmission of TDMA sync and data bursts by artificial frequency selective fade and decision feedback equalization |
Nov. 22, 1994 |
| 5363415 |
Carrier regenerating device correctly operable in mobile satellite communication |
Nov. 8, 1994 |
| 5363408 |
Mode selective quadrature amplitude modulation communication system |
Nov. 8, 1994 |
| 5363410 |
Modulation circuit for a digital radio communications apparatus using a phase shifted DQPSK modulation system |
Nov. 8, 1994 |
| 5355092 |
Relatively simple QPSK demodulator, that uses substantially all digital circuitry and an internally generated symbol clock, and circuitry for use therein |
Oct. 11, 1994 |
| 5347569 |
Gain control circuitry for QAM demodulator |
Sep. 13, 1994 |
| 5333148 |
Data receiver |
Jul. 26, 1994 |
| 5317599 |
Method and circuit for detecting CN ratio of QPSK signal |
May. 31, 1994 |
| 5315620 |
Arrangement for correction of synchronous demodulator quadrature phase errors |
May. 24, 1994 |
| 5311552 |
Trellis coding technique to improve adjacent channel interference protection ratio in land mobile radio systems |
May. 10, 1994 |
| 5311545 |
Modem for fading digital channels affected by multipath |
May. 10, 1994 |
| 5311553 |
Trellis coding technique to increase adjacent channel interference protection ratio in land mobile radio systems under peak power constraints |
May. 10, 1994 |
| 5311555 |
Phase divider for complex signals |
May. 10, 1994 |
| 5301210 |
Coherent demodulating device with carrier wave recovering digital circuit |
Apr. 5, 1994 |
| 5295162 |
Digital demodulator which quantizes signal components according to different thresholds |
Mar. 15, 1994 |
| 5289504 |
Signal decoding method using both signal and channel state information |
Feb. 22, 1994 |
| 5287067 |
Method and apparatus for demodulation with adaptive phase control in quasi-coherent detection |
Feb. 15, 1994 |
| 5283815 |
Tangental type differential detector for pulse shaped PI/4 shifted differentially encoded quadrature phase shift keying |
Feb. 1, 1994 |
| 5280538 |
Spread spectrum demodulator |
Jan. 18, 1994 |
| 5276710 |
Carrier frequency error detector capable of accurately detecting a carrier frequency error |
Jan. 4, 1994 |
| 5272447 |
Demodulator and demodulation method for a digital phase modulated signal |
Dec. 21, 1993 |
| 5272446 |
Digitally implemented fast frequency estimator/demodulator for low bit rate maritime and mobile data communications without the use of an acquisition preamble |
Dec. 21, 1993 |
| 5265126 |
Voice recording and reproducing apparatus having perpendicular carrier modulation |
Nov. 23, 1993 |
| 5257291 |
Circuit for evaluating frequency difference |
Oct. 26, 1993 |
| 5247308 |
Detection and characterization of LPI signals |
Sep. 21, 1993 |
| 5233631 |
Device for recovering a carrier wave provided with a circuit for inhibiting dummy frequency acquisitions |
Aug. 3, 1993 |
| 5233629 |
Method and apparatus for communicating digital data using trellis coded QAM |
Aug. 3, 1993 |
| 5230009 |
Method for deciding region of PI/4 shift quadriphase shift keying modulated signals |
Jul. 20, 1993 |
| 5222103 |
Differential quadrature phase shift keying encoder for subcarrier systems |
Jun. 22, 1993 |
| 5214674 |
Method and apparatus for carrier synchronization acquisition in a digital burst mode communication system |
May. 25, 1993 |
| 5208836 |
Method for bit detection at the receiver end of differentially coded binary or quaternary PSK signals in differential-coherent demodulation |
May. 4, 1993 |
| 5202901 |
Digital discriminator for pulse shaped .pi./4 shifted differentially encoded quadrature phase shift keying |
Apr. 13, 1993 |
| 5179578 |
Coherent demodulator for .pi./4 shifted QPSK signal |
Jan. 12, 1993 |
| 5175507 |
Method of and device for demodulating biphase modulated signal |
Dec. 29, 1992 |
| 5173663 |
Demodulation circuit enabling independent recovery of the carrier and sampling timing |
Dec. 22, 1992 |
| 5172070 |
Apparatus for digitally demodulating a narrow band modulated signal |
Dec. 15, 1992 |
| 5170415 |
Burst demodulator for establishing carrier and clock timing from a sequence of alternating symbols |
Dec. 8, 1992 |
| 5151926 |
Sample timing and carrier frequency estimation circuit for sine-cosine detectors |
Sep. 29, 1992 |
| 5150383 |
Asynchronous quadrature demodulator |
Sep. 22, 1992 |
| 5142553 |
Receiver with direct quadrature sampling of the input signal |
Aug. 25, 1992 |
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