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7616063 |
Frequency synthesizer using a phase-locked loop and single side band mixer
A frequency synthesizer is built using a phase locked loop incorporating a single side band mixer either in the feedback loop or in the input. The single side band mixer is preferably realized with...
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7558549 |
Method and system for rejecting single-sided leakage into an amplitude modulated (AM) channel
Aspects of the method and system for rejecting single sided leakage into an amplitude modulated channel may comprise an AM demodulator for demodulating a received composite broadcast signal's...
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7466959 |
Apparatus and method for IF switching in a dual-tuner, dual-IF, HD radio and FM/AM radio receiver
In a dual-channel HD radio receiver, when the broadband filter channel is compromised, the broadband channel is inactivated and the narrowband channel is activated. By mixing the signals of the two...
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7430247 |
Carrier frequency detection for N-ary phase modulated signal
Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising...
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7418248 |
Signal reception device, signal transmission device, radio communication system, and signal reception method
A signal reception device is disclosed that is able to improve interference cancellation capabilities even when signals having different center frequencies exist on the same frequency band. The...
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7382257 |
Single RF oscillator single-side band modulation for RFID readers with frequency translation and filtering
A transmitter shifts a baseband data signal having a bandwidth of 2ω M using a tone signal having a frequency ω M , which centers a sideband of the data signal at zero frequency. The transmitter...
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7333608 |
Analog scrambler
An analog signal scrambler/de-scrambler includes a receiver for receiving an analog signal and converting the signal into an intermediate frequency signal. A generator generates a pseudo-random...
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7330513 |
Apparatus of transmitter and receiver for MIMO MC-CDMA system
The invention relates to an apparatus of transmitter and receiver for Multiple Input/Multiple Output MultiCarrier-Code Division Multiple Access (MIMO MC-CDMA) systems. At the transmitter, modified...
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7236757 |
High-speed multi-channel communications transceiver with inter-channel interference filter
A communication system is disclosed that allows high data-rate transmission of data between components. N-bit parallel data is transmitted in K-frequency separated channels on the transmission...
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7209721 |
Single sideband mixer and method of extracting single sideband signal
Single sideband (SSB) mixers and methods of extracting a SSB signal, which are capable of outputting a single frequency using a plurality of mixers and a local oscillating frequency without having...
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7184716 |
Low cost/low power analog transceiver architecture
A time division duplex (TDD) single sideband (SSB) transceiver includes a transmitter adapted to input an analog audio signal, sample the analog audio signal, and to output an SSB frequency shift...
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7177609 |
Chopper-direct-conversion (CDC) radio architecture
A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband...
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7120397 |
All-frequency-band SSB radio communication system and radio apparatus
An SSB radio communication system and radio apparatus applicable to ultra high frequencies such as a VHF band and UHF band. In the transmitting side, a carrier wave is amplitude modulated by...
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7107022 |
Single RF oscillator single-side band modulation for RFID readers using tone insertion during reader reception
A transmitter upconverts a SSB data signal during a first operational mode using a RF upconverting signal having a frequency that is offset from a center frequency of a channel (ω C ) by an amount...
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7099640 |
Method distinguishing line of sight (LOS) from non-line of sight (NLOS) in CDMA mobile communication system
The invention discloses a method that identifies whether a channel is LOS or NLOS in a mobile communication system. After coherent accumulation and non-coherent accumulation have been made by the...
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7095781 |
Polyphase filter with stack shift capability
A discrete Fourier transform (DFT) filter bank with stack shift capability, configured, for example, as an analyzer, but equally applicable to a synthesizer, and implemented as a polyphase filter....
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7092682 |
Electronic circuit, modulation method, information processing device, and information processing method
A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification...
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7061977 |
Apparatus and method for using adaptive algorithms to exploit sparsity in target weight vectors in an adaptive channel equalizer
An apparatus and method is disclosed for using adaptive algorithms to exploit sparsity in target weight vectors in an adaptive channel equalizer. An adaptive algorithm comprises a selected value of...
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7050831 |
Through-the-earth communication system
A method and system for communication within an energy-transmission-limited environment. RF transceivers throughout the site are located site-wide such that areas within the site in which...
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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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7003262 |
Method and device for determining sideband ratio of superconduction mixer using comb generator
The present invention provides a method and device for determining the sideband ratio of a superconducting mixer using a comb generator. The method includes the steps of: (a) tentatively adjusting...
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6889035 |
Cable-less interconnect architecture for effecting blind coupling of diplexer to radio transceiver
An RF cable-less interconnect arrangement couples a diplexer to a radio transceiver by providing each of the transceiver and the diplexer by means of respective pairs of RF transmission and...
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6804308 |
Receiver including frequency down-converter and analog-to-digital converter for a wireless telecommunication system
A receiver ( 10 ) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
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6798848 |
Architecture for multi-carrier receiver
A receiver ( 10 ) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
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6724441 |
Tuning system and method in broadcast signal receiver
A tuning system and a tuning method in a broadcast signal receiver, in which a radio frequency (RF) spectrum signal adopting an inverting method is filtered by an asymmetric bandpass filter of a...
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6631255 |
Multi-carrier receiver for a wireless telecommunication system
A receiver ( 10 ) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
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6178312 |
Mechanism for automatically tuning transceiver frequency synthesizer to frequency of transmit/receiver filter
Frequency synthesizers of a radio transceiver are automatically tuned so that its transmit and receive frequencies correspond to whichever upper band and lower band filters the radio transceiver...
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6125271 |
Front end filter circuitry for a dual band GSM/DCS cellular phone
A front end circuit for an RF dual band GSM/DCS phone includes a first channel including an elliptical high-pass filter, a first SAW filter, and a low noise amplifier and a second channel including...
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6023614 |
Method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, particularly for FM signals
A method for decoding a suppressed-carrier modulated signal in the presence of a pilot tone, comprising the steps of: extracting the pilot signal from the modulated signal; obtaining the...
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5875389 |
SSB radio receiver
An SSB radio receiver having an inexpensive wide-band IF filter which passes through not only a reception objective SSB station IF signal but also an interference SSB station IF signal...
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5603110 |
Process and arrangement for compensating adjacent-channel interference in a double-sideband amplitude modulation system
Disclosed is a procedure for filtering out the lower one of the upper other sideband of a double sideband oscillation consisting of a mix of several double sideband oscillations, the lower one...
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5548243 |
Demodulator for demodulating a single side band signal, a real zero single side band signal and a frequency modulated signal, and a carrier signal reproducing circuit for the demodulator
A demodulator receives a radio signal and causes a carrier signal reproducing circuit to reproduce the carrier signal of the received signal. One amplifier amplifies the amplitude of the reproduced...
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5416449 |
Modulator with harmonic mixers
An improved modulator circuit for mixing a modulation signal with a carrier signal includes first and second harmonic mixers which are operative to produce modulated output signals at an output...
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5109531 |
Sideband receiver with pilot lock
A sideband receiver that locks to a pilot component of a received signal. The pilot component is down-converted and then up-converted prior to phase comparing the pilot component information to...
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4955083 |
Dual mode radio transceiver for an SSB communication system
A radio transceiver is disclosed for use in an SSB communication system having FM data capability. The dual-mode radio transceiver of the present invention includes a receiver capable of...
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4811423 |
SSB receiver with improved feedforward AGC
SSB receivers which use feedback and feedforward automatic gain control (AGC) are subject to bursts of noise in the audio output due to the action of the feedforward AGC when signals having low...
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4759079 |
Random noise detecting system and method
A system and method for detecting the level of random noise contained in a band-limited amplitude-modulated signal. A sychronizing signal is produced which is π/2 out of phase with respect to the...
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4718116 |
Method and apparatus for receiving a compressed composite signal
A compressed single side band communication system and method in which the audio signal is compressed prior to pre-emphasis and thereafter summed with a pilot tone for further compression prior to...
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4625331 |
Automatic frequency control system or an SSB receiver
A frequency control circuit for a single sideband receiver is disclosed wherein the local oscillator is swept at a first rate to enable the acquisition of a transmitted signal. When the signal is...
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4596046 |
Split loop AFC system for a SSB receiver
An automatic frequency control circuit for a single side band receiver employing a split-loop phase locked loop system is disclosed. Initially, both a first and second voltage controlled oscillator...
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4573208 |
Compressed single side band communications system and method
A compressed single side band communication system and method in which the audio signal is compressed prior to pre-emphasis and thereafter summed with a pilot tone for further compression prior to...
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4554679 |
Noise reduction system for a single sideband multiplex signal
A transmitted signal includes a pilot signal at a given frequency and an information signal occupying a different band of frequencies. A noise reduction system for a signal receiver detects...
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4525862 |
Transform modulation system
A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver, the signal can be recovered...
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4479226 |
Frequency-hopped single sideband mobile radio system
The present invention relates to a frequency-hopped single sideband (SSB) mobile radio system implemented by hopping the carrier frequency of an input signal (s(t)) every τ seconds. The hopping is...
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4462114 |
Signum signal generator
A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver, the signal can be recovered...
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4403348 |
Single sideband receiver with intersyllabic gain correction limit control
In a single sideband radio receiver utilizing a limited, pilot-controlled, gain correction arrangement (38) to compensate for radio channel fading, a signal (RECT CAP) representing receiver audio...
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4397039 |
Instantaneous phase tracking in single sideband systems
A receiver for demodulating a single sideband signal which is subject to rapid phase jitter employs a Hilbert splitter for obtaining the Hilbert transform of the single sideband signal, and a local...
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4328590 |
Single sideband receiver
A single sideband receiver translates the frequencies of a received signal composed of a data signal and a pilot tone to predetermined intermediate frequencies. Filters separate the intermediate...
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4320531 |
Time shared frequency conversion system
A frequency conversion system, including a time shared frequency converter and a time shared band limited amplification system, whereby a plurality of information bearing signals are commonly...
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4313211 |
Single sideband receiver with pilot-based feed forward correction for motion-induced distortion
Effects of multipath fading and Doppler frequency spread in a single sideband radio communication system are largely overcome by separating (17) from a received signal spectrum, a pilot frequency...
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