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7460612 Method and apparatus for a fully digital quadrature modulator  
A novel apparatus and method for a fully digital quadrature architecture for a complex modulator. The complex modulator can substitute for existing prior art analog quadrature modulator structures...
7449960 Frequency modulation linearization system for a Fractional-N offset PLL  
A linearization system is provided for a Fractional-N Offset Phase Locked Loop (FN-OPLL) in a frequency or phase modulation system. In general, the linearization system processes a modulation...
7412008 Programmable phase mapping and phase rotation modulator and method  
A modulator ( 10 ) and method provides a programmable phase rotation for supporting different modulation formats and different phase rotations. The modulator ( 10 ) includes a programmable symbol...
7212585 Quadrature modulation transmitter  
There is provided a quadrature modulation transmitter which is capable of solving several problems of the conventional transmitter while performing the same function as the heterodyne transmitter...
7161437 Voltage-controlled oscillator and quadrature modulator  
A ring oscillator of an even number of stages of inverting/summing amplifiers that adds, to an input of each of the amplifiers, a signal from one such of the amplifiers as to be distant by an even...
7095996 Wireless communication system, and demodulation method and data rate control method therefor  
A transmitter and a receiver share a maximum number of transmission bits per symbol as a parameter. The transmitter modulates an encoded and interleaved transmission signal in accordance with a...
7009461 Phase shifted binary transmission encoder, a phase modulator, and an optical network element for encoding phase shifted binary transmission  
The invention relates to a phase shifted binary transmission encoder with data input and data output, where the phase shifted binary transmission encoder includes an exclusive or gate having two...
6928123 Wireless network with enhanced data rate  
A high-speed transmitter for digital data having a variable data rare, the transmitter comprising a convolutional encoder, adapted to generate, for each group of k input bits in a bitstream, n...
6873218 Frequency modulator using a waveform generator  
A Multi-mode Loop Frequency modulator ( 10 ) for modulating a carrier signal according to various modulation pulse shapings and data signal to provide a modulated output signal (VCOout), comprises...
6766148 Switched sideband frequency low-IF transmitter  
A transmitter for transmitting a high frequency transmit signal generates a low intermediate frequency quadrature signal, and up-converts the low intermediate frequency quadrature signal to the...
6696900 Method for demodulating PSK modulated signals  
The present invention is a method for demodulating a PSK modulated signal wherein the PSK system incorporates a transmitter generating a PSK modulated signal and wherein the transmitter is crystal...
6670861 Method of modulation gain calibration and system thereof  
A wideband impedance attenuator includes a phase-locked loop filter, a voltage-controlled oscillator connected to the phase-locked loop filter during transmit, and an impedance circuit connected to...
6621366 Parallel-process digital modulator structures and methods  
In order to generate a carrier frequency F c , a digital modulator must operate (to satisfy the Nyquist criteria) at a system sample rate R s which is at least twice the carrier frequency F c ....
6531935 Vector modulator  
An analogue phase shifter with vector modulator is envisioned. The analogue phase shifter has an input stage that provides the generation of a pseudo-basis of four vectors. The analogue phase...
6498818 Method and system for transmitting information by means of phase modulation  
A method and system for transmitting digital data by means of phase modulation is characterized in that the data are coded at the transmitting end with a code after the fashion of the Differential...
6434199 2N-QAM macrocell  
A 2 N -QAM macrocell for generating constellations with 2 N symbols, where N is the number of bits in the digital data word [D 0 :D N−1 ] applied to the macrocell. Since the digital data word is...
6424682 BPSK encoder circuit  
A BPSK encoder is provided with a first circuit which processes a carrier signal and a binary signal to be encoded, and produces an output binary signal having synchronous phase shifts representing...
6342821 Device capable of QPSK modulation and phase compensator for the same  
A device and method capable of QPSK(Quadrature Phase Shift Keying) modulation, which up-converts a baseband signal to an IF(Intermediate frequency) signal. A phase compensator receives a digital...
6320912 Digital modulator  
There is disclosed a digital modulator whose modulation parameter can be controlled and in which modulation data or modulated signals are prevented from generating interference signals with...
6194977 State variable-based table-driven modulation signal generation  
Dibits (i.e., pairs of bits) in an input data stream are converted into a modulation signal (e.g., a π/4-DQPSK modulation signal) using a technique that relies on pre-computed filter output values...
6184756 Modulator  
A low frequency signal generating portion 1 generates a first discrete signal (a signal sampled at a first sampling rate f 1 ). A band pass portion 2 operates at a second sampling rate f 2 ,...
6169463 Quadrature modulator with set-and-forget carrier leakage compensation  
A quadrature modulator with set-and-forget carrier leakage compensation. The quadrature modulator comprises an in-phase and a quadrature branch. In the in-phase and quadrature branches, real-time...
6163230 Phase-shift keying electronic circuit with distributed structure  
The invention concerns a modulating electronic circuit with m phase status m≥2 comprising a distribution line (6) with n similar dephasing cells (Ci) n≥2, each comprising a transistor supplying...
5990755 Phase modulator efficiently utilizing waveform storing section  
Ramp period detecting circuit 101 outputs signal Tc that indicates the start and end of the ramp period. Two-dimensional quadrature coordinates (Iα,Qα) and (Iβ,Qβ) are output alternately....
5859869 Low cost binary phase shift keying modulation transmitter system  
An improvement in spread spectrum modulator systems, and more particularly further improvements in spread spectrum BPSK, or Binary Phase Shift Keying, Modulation systems, the present invention...
5818867 QPSK/QBL-MSK waveform enhancement  
A modulator device is disclosed for a spread spectrum communication system which generates a modulated signal from incoming data. The device includes a QPSK portion for separating the incoming data...
5712878 Digital FSK modulator  
A FSK modulator which uses the combination of a state machine and a toggle flip-flop to generate the FSK signals. The state machine has a loop having a predetermined number of states. The number of...
5652552 Phase modulator  
A phase modulator that generates four different kinds of phases according to input data, using a counter and an adder. There is provided a phase modulator with a serial-to-parallel data converter...
5570392 Phase generator  
A digital down converter with a programmable mixing down frequency and a programmable extraction bandwidth uses a ROM based sin/cos generator plus a programmable high decimation filter followed by...
5548541 Finite impulse response filter for modulator in digital data transmission system  
A finite impulse response (FIR) filter is provided for shaping a one bit serial digital data pulse train in a digital data transmission system. The filter comprises (i) a delay element for...
5548253 Spectrally efficient quadrature amplitude modulator  
A spectrally efficient quadrature amplitude modulator comprising means for providing in-phase (I) and quadrature-phase shifted (Q) bit-streams from an input serial bit-stream, means for selectively...
5528631 π/4 shifted DQPSK modulator  
A π/4 shifted DQPSK modulator includes a mapping/filtering circuit (6) equipped with a mapping function and filtering function. The mapping/filtering circuit (6) allows phase information which is...
5523726 Digital quadriphase-shift keying modulator  
A digital quadriphase-shift keying modulator is described which generates a modulated intermediate carrier frequency (IF) based on a desired number of samples for each input information bit. The...
5512865 Digital oversampled quadrature modulator  
The preferred embodiment modem is an all hardware modulator which receives as its input two baseband drive signals, I and Q, which can come from a ROM filter or any other digital filter. Instead of...
5455544 Low power consumption binary phase-shift-keyed (BPSK) modulator using reflective electronic switching techniques  
A low power consumption BPSK modulator uses only a single input transformer which is not required to be center-tapped, and a switching arrangement including four junction field effect transistors....
5446760 Programmable digital pulse shaping phase modulator  
A digital pulse shaping and phase modulation network is used for reducing out-of-band spectral energy. This network is used in conjunction with a NCO (numerically controlled oscillator) which...
5444420 Numerically controlled phase lock loop synthesizer/modulator and method  
A phase lock loop (PLL) circuit and method in which a PLL circuit locks on a variable input phase by providing an instantaneous phase value of a signal from an oscillator at periodic intervals, and...
5420887 Programmable digital modulator and methods of modulating digital data  
A programmable digital modulator and methods of modulating digital data for transmission by a communication system according to operating parameters selected for various applications are provided....
5369378 Digital DQPSK modulator  
A digital DQPSK modulator according to the present: invention limits respective bands of symbol mapping data of I phase and Q phase obtained by applying differential encoding and mapping...
5361047 PI/4 shift QPSK modulator and communication apparatus used therewith  
A π/4 shift QPSK modulator for receiving digital signals and for outputting a modulated signal therefrom in accordance with each of the inputted digital signals. The π/4 QPSK modulator is...
5361046 Modulator having fractional sample/symbol time  
A modulator capable of providing a fractional sample or symbol 995486 time employs a decimation counter (23) responsive to a clock having a frequency equal to M/N×(data symbol clock), where M is...
5289503 Method and circuit arrangement for producing a QPSK signal on which a carrier signal is superposed  
A method of generating a composite signal in the form of a QPSK signal on which an additional carrier signal is superposed, wherein a carrier signal is conducted through two series connected,...
5260673 π/4 differential encoding for digital cellular mobile systems  
A π/4 differential phase shift encoder that is implemented by simple digital logic circuits or a small number of digital signal processor instructions. The hardware logic circuit which implements...
5255288 Arrangement for converting binary input signal into corresponding in-phase and quadrature phase signals  
In order to effectively reduce a memory size of each of two memories provided in an arrangement for converting a binary input data into the corresponding inphase and quadrature signals, a memory...
5214396 Method and apparatus for providing a biphase modulated signal having flat envelope characteristics without a direct current component  
A biphase shift keying modulation circuit includes: a clock pulse generator for generating system clock pulses; a random data generating unit for dividing the frequency of the system clock pulses...
5148127 Biphase shift keying modulation circuit having constant envelope characteristics  
A biphase shift keying (BPSK) modulation circuit for digital data transmission capable of preventing occurrence of signal distortion, even in phase shifting positions upon a power amplification of...
5121412 All-digital quadrature modulator  
A CPFSK quadrature modulator (300) is disclosed utilizing an all-digital implementation. The serial data input signal (20 ) is formatted into parallel overlapping bits using a shift register (202),...
5063361 Serrodyne modulator  
A direct digital synthesizer (DDS) includes a phase accumulator which generates phase words periodically and means for changing the phase of an RF signal. In a preferred embodiment, a DDS includes...
4999590 Four state phase shift modulator, in particular for amplitude modulation of two carriers in quadrature with a large number of states  
A QPSK modulator has a signal generator which generates four carrier outputs having respective phases of 0°, 90°, 180°, and 270°. A four input phase selector is connected to the four outputs of...
4996503 Phase modulator circuit for encoding two binary digits per cycle of sine wave carrier  
A phase modulator circuit for encoding successive serial binary digits at the zero crossing points of a sine wave carrier. A digital one is encoded as a brief phase deviation of the carrier and a...
Matches 1 - 50 out of 107 1 2 3 >