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7613253 |
Noise balanced QAM detection
A method of demodulating digital data using M'ary QAM has been disclosed, comprising the steps of detecting a complex symbol vector D, establishing within which reference symbol boundaries the...
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7609783 |
Amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem
An amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem is a low-cost and high-performance ASK demodulation core,...
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7593695 |
RF transceiver incorporating dual-use PLL frequency synthesizer
A dual-use PLL frequency synthesizer for use in a transceiver is capable of operating as a local oscillation generator in a receiving mode and as a transmitter in a transmitting mode. The PLL...
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7583757 |
Joint symbol, amplitude, and rate estimator
The system in one embodiment relates to tightly integrating parameter estimation, symbol hypothesis testing, decoding, and rate identification. The present invention provides Turbo-decoding for...
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7583694 |
Data definition apparatus, systems, and methods
An apparatus and a system, as well as a method and article, may operate to send a selected data type without self-definition information to a receiver if a state capable of interpreting the...
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7580673 |
Leader-follower power control
In a satellite or other relayed communication system having a plurality of subscriber terminals that communicate through an elevated wireless relay (typically a satellite operating in bent pipe...
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7577208 |
VSB transmission system
A vestigial sideband (VSB) modulation transmission system and, a method for encoding an input signal in the system are disclosed. According to the present invention, the VSB transmission system...
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7555062 |
Method and device for delay-sensitive measurement of a signal
A method and device for detecting the amplitude and/or the phase position of an intensity-modulated signal, including the following: detecting an instant value of the intensity-modulated signal and...
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7545892 |
Method and circuit for controlling the input signal for a contactless transponder
Method for controlling an input signal for a contactless transponder, in which a signal strength of an amplitude-modulated input signal is controlled to a nominal value, and identification of a...
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7535291 |
AM demodulator
An amplitude modulation receiver including an antenna for receiving a signal and an input filter connected to the antenna. A variable gain amplifier is connected to the input filter and is...
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7502426 |
Method for estimating signal magnitude, noise power, and signal-to-noise ratio of received signals
An improved system and method for estimating one or more parameters, such as amplitude and signal-to-noise ratio, of a received signal, such as an M-QAM or q-ASK signal, is set forth herein. The...
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7492835 |
Synchrodyning apparatus
Synchrodyning apparatus in which a PAM IF signal is mixed with unmodulated carriers nominally at the frequency of the carrier, which unmodulated carriers are in quadrature with respect to each...
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7474713 |
System and method for demodulating multiple QAM signals
A system and method demodulate N QAM signals (N being a positive integer equal to or greater than 1) substantially simultaneously using, for example, one or two oscillators, regardless of how many...
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7466747 |
Method and apparatus for wireless data transfer
A method and apparatus for wirelessly transmitting data between two devices ( 101. 102 ) is provided herein. During data transmission, a data and a strobe signal are transmitted simultaneously on...
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7463703 |
Joint symbol, amplitude, and rate estimator
The system in one embodiment relates to tightly integrating parameter estimation, symbol hypothesis testing, decoding, and rate identification. The present invention provides Turbo-decoding for...
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7450666 |
Ask demodulation device and wireless device using the same
A delay section delays a detected signal by less than one bit time in the NRZ data. A subtraction section performs subtraction between a delayed signal and the detected signal, and outputs a...
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7446695 |
Precision pulse detection system for radar sensors
A precision pulse detection system for time-of-flight sensors detects a zero axis crossing of a pulse after it crosses above and then falls below a threshold. Transmit and receive pulses flow...
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7444128 |
Method of estimating a high frequency carrier signal
A method of estimating the carrier frequency of a signal is disclosed. The method comprising the steps of initializing a time average vector to zero, selecting a user-selectable time segment to...
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7426243 |
Preprocessing signal layers in a layered modulation digital signal system to use legacy receivers
Systems and methods for receiving non-coherent layered modulation signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase...
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7423987 |
Feeder link configurations to support layered modulation for digital signals
Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable...
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7417496 |
Demodulator circuit of RFID system
Provided is a demodulator circuit allowing a tag or transponder to efficiently recover data of an input amplitude signal at very low power in a wireless communication system such as a radio...
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7363648 |
Cable modem tuner
An IF input signal corresponding to a selected reception channel is applied through an SAW filter to an IF-AGC circuit, the amplitude of the signal is adjusted to a prescribed level, and the signal...
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7349493 |
Demodulation with separate branches for phase and amplitude
A receiver architecture is disclosed for use in Time-Division Multiple Access (TDMA) and related digital radio applications which combines the principal benefits of the conventional hard-limiting...
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7340010 |
Forward error correction coding for hybrid AM in-band on-channel digital audio broadcasting systems
An AM compatible digital audio broadcasting signal comprises an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by...
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7308046 |
System and method for detecting presence of digitally modulated waveform
The disclosure is directed to a system for detecting digitally modulated waveforms on a transmission channel. The system includes an amplitude modulation detector configured to detect amplitude...
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7221718 |
I/Q demodulator and I/Q signal sampling method thereof
An I/Q demodulator optimized with a minimum amount of hardware. First and second multiplexers generate I and Q signals with respect to an input data signal; and first and second 2-decimation units...
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7218642 |
Methods and systems for high speed broadband digital link
Provided herein are methods and systems for a digital subscriber line protocol that does not require amplitude modulation, as well as methods and systems for such a protocol that can be used in...
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7164901 |
DC offset-free RF front-end circuits and systems for direct conversion receivers
A DCR RF front-end removes the DC term resulting from mixer port to port leakage and feeds RF and LO signals into the mixers with different phase combinations. The signal inputs to the mixers...
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7162000 |
Delay locked loop synthesizer with multiple outputs and digital modulation
A delay locked loop circuit ( 200 ) in which multiple outputs are produced. A single delay line ( 24 ) is shared among multiple tap selection circuits ( 256 A, 265 B, 265 C). Fixed phase shifts (...
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7149259 |
Center of gravity control for hierarchical QAM transmission systems
A OAM receiver includes a source of a received hierarchical OAM signal. The hierarchical OAM signal represents successive data points in the I-Q plane, each data point being in one of four...
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7120202 |
Wireless communication apparatus
In a wireless communication apparatus which has the functions of both ASK modulation and QPSK modulation, which can be manufactured at a low cost, and which is small in size, an output terminal of...
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7102498 |
Remote keyless entry system with two modes of demodulation
A remote signaling receiver system includes a receiver that operates in two different modes of demodulation to accommodate different types of signals from different types of transmitting devices. A...
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7092465 |
Method and apparatus for processing an amplitude modulated (AM) signal
In order to protect against adjacent channel interference and the effects of weak signal in AM signal processing, pre- and post-AM demodulation filters ( 36 and 38 ) may be used where the...
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7092456 |
Process for synchronization
A process for synchronization of an input signal (S) involves demodulating ( 5 a ) the input signal (S) according to a particular demodulation method (AM) using a particular signal parameter for...
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7016659 |
Amplitude modulation with time- and spectrum-shared sidebands
In an AM system directed to commercial broadcasting, a pure unmodulated (CW) carrier signal and two sideband signals are generated and processed separately as three independent signals that are...
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7016425 |
Quasi-differential modulation/demodulation method for multi-amplitude digital modulated signals and OFDM system
The invention proposes the separate processing of the phase and amplitude of multi-amplitude digital modulation techniques, such as a QAM. The phases are differentially modulated and the amplitudes...
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6999536 |
System for phase error estimation for a quadrature modulator
The present invention discloses a system and method of estimating phase error in a waveform sent from an analog transmitter. In a first technique, the ratio of the minimum to maximum envelope may...
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6987434 |
Non-radiative dielectric waveguide modulator having waveguide type hybrid coupler
A non-radiative dielectric (NRD) waveguide modulator is provided having a waveguide type hybrid coupler, in which by forming a waveguide type 180° hybrid coupler and waveguide as a single body,...
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6985540 |
AM demodulator
An AM demodulator includes an APC detection circuit that compares phases of an AM-modulated input signal and a signal output from a VCO. However, the APC detection circuit multiples the two signals...
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6963697 |
Increased transmission capacity for a fiber-optic link
A method of decoding a signal in an optical fiber. In one embodiment the method includes receiving the optical signal, wherein the optical signal is a pulse amplitude modulated signal. Converting...
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6917787 |
System and method for superheterodyne frequency multiplication signal expansion to achieve a reduced bandwidth frequency or phase modulation communication channel
The present disclosure provides a method and apparatus for communicating a base band signal via a communication channel that connects a transmitter to a receiver comprising the steps of modulating...
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6907088 |
Contactless IC card for preventing incorrect data recovery in demodulation of an amplitude-modulated carrier wave
In a contactless IC card that performs envelope detection on an ASK-modulated carrier wave and demodulates the carrier wave to recover data piggybacked thereon, demodulation is suspended during...
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6879626 |
Transmission/reception apparatus and modulation system estimation method
Modulation system estimator 108 sets an amplitude value of a signal modulated with a multivalue modulation with the less number of bits per symbol among two modulation systems selectively used at...
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6861901 |
Voltage follower circuit
A voltage follower comprising a first field-effect transistor (MN 1 ) whose gate forms the input of the voltage follower. Further provided is a second field-effect transistor (MN 2 ) whose drain...
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6823025 |
Amplitude modulation detector
An amplitude modulation detector use peak detection. A CAS (Customer premise equipment Alert Signal) detection apparatus and a caller information detection apparatus use the peak detection and...
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6809584 |
Signal transmission and receiving methods optimized for integrated circuit implementation
A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second...
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6803815 |
Amplitude modulation demodulation circuit
A first automatic phase control (APC) detection circuit generates an APC detection signal having normal polarity from an amplitude modulation signal and APC detection reference signal. A second APC...
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6748028 |
Digital AM demodulator, particularly for demodulating TV signals
A digital AM demodulator, particularly for demodulating an input signal originating from a tuner, includes a first carrier generator for generating a first carrier signal which is not correlated...
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6744827 |
Demodulator arrangement, method to demodulate, and telecommunication system comprising such a demodulator arrangement
A demodulator arrangement, suitable to demodulate data symbols modulated in accordance with a predefined constellation diagram and sent as part of information bursts (A 1 , B 1 , C 1 , D 1 , A 2 ,...
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6744309 |
Absolute value amplitude baseband detector
Amplitude detection of a baseband electrical signal. The detection may be performed by performing full wave rectification on both an in-phase portion of the electrical signal, as on a...
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