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7590181 |
Adaptive modulation and coding
In an adaptive modulation and coding method one or more adjustable values are created (S 1 ), each corresponding to at least one of a plurality of available modulation and coding levels applicable...
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7561002 |
Method and apparatus for frequency modulating a periodic signal of varying duty cycle
A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal...
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7298220 |
Method and apparatus for creating a multiple loop VCO
Disclosed herein is a method and apparatus used to create an idealized voltage controlled oscillator (VCO) which allows very high modulation rates without the expected phase noise (jitter) which...
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7248626 |
System and method of communication via embedded modulation
A single subscriber line multi-point communication system is disclosed. In general, the multi-point communication system can include a first transceiver coupled to a subscriber line capable of...
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7157985 |
PLL modulation circuit and polar modulation apparatus
First and second calibration signals ( 308, 309 ) are sent to a frequency divider ( 102 ) and an adder ( 116 ) of a PLL section ( 100 A), demodulated in a demodulator ( 111 ), filtered through a...
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7057467 |
Light-controlled oscillator
A light-controlled oscillator includes a circuit device, a detection circuit and a control circuit. The circuit device changes its characteristics when light is applied, so that a frequency of the...
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6961547 |
Wireless transmitter incorporating a synchronous oscillator in a translation loop
A translation loop signal upconverter is disclosed. Embodiments of the invention minimize n th order harmonics and spurious tones in the radio frequency output spectrum of a portable transceiver....
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6912249 |
Method and system for training a radio receiver
A system and method for training a radio receiver to mitigate the effects of ISI caused by multi-path includes receiving a header of a transmitted packet at the receiver, the header containing at...
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6671328 |
Generating signals having different modulation formats
A signal having one of a plurality of modulation formats is formed by encoding first data in accordance with a particular one of the modulation formats. The encoded first data is then combined with...
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6628706 |
Method and apparatus for transforming a channel estimate
Channel estimation is performed for a received signal, wherein different parts of the received signals are modulated using different modulation types. The channel is first estimated based on part...
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6535561 |
Dual-mode modulation systems and methods including oversampling of narrow bandwidth signals and DC offset compensation
A narrow bandwidth signal, such as a narrowband FM signal, is modulated in a modulator that modulates a wide bandwidth signal, such as a CDMA signal, by oversampling the narrow bandwidth signal and...
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6373883 |
Radio receiver and a radio transmitter
A radio receiver is adapted to receive radio signals in at least two frequency bands, in which the radio signals are modulated by information signals. The radio receiver includes a device for...
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6369699 |
Single-cable transmission device for signals and power supply of a surveillance system
The present invention provides a single-cable transmission device for signals and a power supply of a surveillance system, which only requires a single cable to transmit various signals and a power...
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6259731 |
System and method for radio-communication using frequency modulated signals
A method has the steps of generating a first control message having a plurality of message symbols and a first audio message to be transmitted from a first radio-communications device to a second...
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6204735 |
Geometrically modulated waves
A novel communications method for generating specific unique information containing waveforms, for geometrically modulating a signal with those waveforms, and an apparatus for generating the...
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6130919 |
Method and device for digital frequency modulation
A method and device are adapted to perform digital frequency modulation. First, an input frequency modulation signal is converted into a digital signal via an A/D (Analog/Digit) adapter, then a...
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6100771 |
Multi-signal generator
It is to provide a multi-signal generator which is able to lower the cost thereof by performing modulation in a low frequency range and using an output of a frequency synthesizer commonly to all...
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6069537 |
Double mode modulator
A double mode modulator, particularly, for a portable telephone, which is adapted to realize both digital and analog modulations and have a low phase noise and a reduced locking time with a device...
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6038265 |
Apparatus for amplifying a signal using digital pulse width modulators
An electronic apparatus that includes a digital processor (12), a first digital pulse width modulator (304), a second digital pulse width modulator (306), a combining circuit (308), and a load...
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6005896 |
Radio data communication device and radio data communication method
A radio data communication device that can perform a packet communication with the packet configuration suitable for transmission of a large volume of data in packet communications utilizing a low...
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5987068 |
Method and apparatus for enhanced communication capability while maintaining standard channel modulation compatibility
In a radio communication system (100), enhanced communication capability is provided while maintaining standard channel modulation compatibility. At a transmitter (110, 200, 600), a first...
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5945885 |
Digital baseband modulator adaptable to different modulation types
A digital baseband modulator having a flexible architecture that is readily adaptible to a variety of digital modulation types is provided. A symbol builder maps the input data to a series of...
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5894249 |
Digital and analog modulator in a simplified circuit structure
A digital and analog modulator is configured in a simplified circuit structure. The modulator includes a first frequency mixer circuit for modulating a carrier with an analog signal or a sine wave...
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5854813 |
Multiple access up converter/modulator and method
A multiple access digital up converter/modulator includes selectors (1606, 1608) having inputs (1602, 1604) and outputs coupled to first and second interpolating filters (1610, 1626). The output of...
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5771442 |
Dual mode transmitter
In a dual mode transmitter for modulating, in a digital mode, an input digital signal and transmitting a modulated digital signal and modulating, in an analog mode, an input analog signal and...
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5764692 |
Dual mode radiotelephone modulator
A dual-mode frequency and phase RF modulator (11) for use in a transmitter of a radiotelephone. A dual-mode modulation approach is employed wherein, in the analog (FM) mode of operation, a phase...
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5694093 |
Wideband IQ modulator with RC/CR automatic quadrature network
An IQ modulator incorporates a quadrature network that is responsive to a frequency dependent control signal and that has in-phase and quadrature signals that are of equal amplitude and in exact...
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5694094 |
Narrow band arbitrary HF modulation and noise generator
A high frequency arbitrarily modulated signal and noise generator utilizes digital numerically controlled oscillators providing interbusiness directly to an adder and which are phase modulated. The...
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5648985 |
Universal radio architecture for low-tier personal communication system
An integrated circuit chip set is provided for use in a radio communication system in which a modulated digital input signal is processed for transmission and a modulated signal received from an...
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5598130 |
Phase modulator capable of individually defining modulation degree and modulation frequency
An FM signal generator generates an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal. A first mixer mixes the FM signal and an input signal...
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5521559 |
Signal oscillator, FM modulation circuit using the same, and FM modulation method
A coefficient circuit 11 multiplies a digitized input modulation signal by a constant and outputs the multiplied signal. Delay circuits 12 and 13 delay the discrete in-phase input signal and...
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5491832 |
Cellular radio communications system
A modulation apparatus for a cellular radio system in which capacity is increased and power consumption is minimized, said system covering large and small area cells of different sizes. At least...
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5473290 |
Variable-throughput digital modulator and its use in FM radio broadcasting
A variable-throughput digital modulator receives at an input a transmission digital signal e(t). The transmission digital signal is time-based demultiplexed (1) into first and second elementary...
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5463356 |
FM band multiple signal modulator
Apparatus and a method for generating all of the assignable carrier frequencies in the FM broadcast band and for frequency modulating the generated carriers includes a generator of a train of...
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5461347 |
Apparatus and method for geometrically modulating electromagnetic radiation and a receiver for decoding geometrically modulated signals
A novel communication apparatus comprising a transmitter capable of geometrically modulating an existing modulated electromagnetic signal, a method for geometrically modulating a frequency...
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5446422 |
Dual mode FM and DQPSK modulator
A dual-mode radiotelephone terminal includes a π/4-shift DQPSK modulator (11). A dual-mode modulation is achieved by mixing an output of a transmitter oscillator (16) with an output of an offset...
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5446421 |
Local oscillator phase noise cancelling modulation technique
A data transmission system includes a source of a data signal and a modulator, responsive to the data signal, producing a first modulated signal representing the data signal and a second modulated...
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5329260 |
Numerically-controlled modulated oscillator and modulation method
A numerically-controlled modulated oscillator and modulation method which selectively provides frequency modulation, phase modulation or amplitude modulation with minimal circuitry. A...
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5179360 |
Transmitting/receiving apparatus switchable between digital and analog modulation modes
Upon transmission, when the digital transmission mode is set, an analog audio signal is A/D converted, the digital audio signal is coded, a first carrier is modulated by the coded signal and...
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5124672 |
Combined analog/digital frequency modulator
A circuit arrangement allows either analog (ANAL) modulation or (DIG) digital modulation to be selected by means of couplers (K1, K2) for transmission over a radio channel. The analog or digital...
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5093636 |
Phase based vector modulator
Vector modulation is effected by summing output signals from two phase modulators. The lack of amplitude modulation on the signals when summed permits non-linear processing of the signals, such as...
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5045817 |
FM deviation control of direct digital synthesizers
In a direct digital synthesizer providing a frequency modulated output the modulation input is bit shifted and the rate of the direct digital synthesizer phase accumulation is controlled to provide...
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4973923 |
Circuit arrangement for the generation of I,Q waveforms
In a circuit arrangement for the generation of I,Q waveforms, an incoming analog signal controls a voltage-controlled oscillator (1), whose output signal (U1) is frequency-modulated. This signal...
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4947455 |
RF power supply for supplying a regulated power amplified unmodulated drive signal to an RF modulator
An RF power supply serves to supply a regulated power amplified RF drive signal to an RF transmitter. The supply includes an RF oscillator for providing an RF input signal. A DC voltage source...
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4878035 |
Hybrid frequency shift keying modulator and method
A hybrid frequency shift keying modulator and method produces binary FSK by simultaneously applying a digital modulating signal to the DDS section of a frequency synthesizer along with a...
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4841571 |
Privacy signal transmission system
A privacy signal transmission system having a transmitter portion and a receiver portion. The transmitter portion digitizes an analog message signal and enciphers the digitized signal into a...
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4806881 |
Multi-channel modulated numerical frequency synthesizer
A four-channel multifunction digital frequency synthesizer which uses direct numerical synthesis to generate one or more complex output signals having selectable frequency, phase offset, amplitude...
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4782531 |
Multichannel FM subcarrier broadcast system
A multichannel FM subcarrier broadcast system is disclosed which enables the transmission of multiple independent signals by generating independent sidebands of suppressed carriers in the...
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4763085 |
Mutually injection locked millimeter wave voltage controlled oscillators with power combiner
Disclosed is a circuit for power combining electromagnetic energy in the millimicrowave frequency band where the electromagnetic energy is produced by two substantially identical varactor tuned...
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H000484 |
Polarization isolation and zero time-sidelobe pulse compression through group-complementary coding
This concept makes use of the orthogonal nature of Group-Complementary Co to achieve improved polarization isolation between the vertical and horizontal radiation in a circularly polarized or dual...
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