Abstract:
A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bits, the transmitting signal is subjected to FIR filtering. The two FIR filters are primed with a sequence using a parallel input mode before serially entering the information data.
Abstract:
Systems and methods for performing joint demodulation using a Viterbi equalizer having an adaptive total number of states are disclosed. Generally, a method includes joint demodulating a desired signal and none or more interfering signals with a Viterbi equalizer having an adaptive total number of states based on channel impulse response (CIR) coefficients associated with a desired signal and the one or more interfering signals.
Abstract:
Mobile device for receiving, demodulating, processing and storing an internet network or a cellular system provided photo, video or television (TV) signal. Processing photo and video signals generated in a cellular phone or mobile device and providing photo and video to a television (TV) set.Processing, modulating and transmitting a baseband video signal into a processed Orthogonal Frequency Division Multiplex (OFDM) modulated signal and transmitting OFDM modulated signal to a TV set or to a other mobile (portable) device. Method for receiving and processing a Global Positioning System (GPS) generated signal and touching the screen of a mobile phone and generating a processed control signal. Storing and transmitting a video signal and receiving, demodulating and processing a Code Division Multiple Access (CDMA) modulated signal into a demodulated processed in-phase and quadrature-phase cross-correlated signal and demodulating and processing a Time Division Multiple Access (TDMA) modulated signal into a demodulated processed in-phase and quadrature-phase cross-correlated signal.
Abstract:
A “unified” modulator for multiple modulation schemes (e.g., GMSK and 8PSK) is described. The waveform for each modulation scheme is generated based on a set of one or more pulse shaping functions. The waveforms for all supported modulation schemes may be generated based on a composite set of all the different pulse shaping functions. The unified modulator includes a filter for each pulse shaping function in the composite set. To generate the waveform for a selected modulation scheme, the set of one or more filters for this modulation scheme is enabled and all other filters are disabled. The outputs from all enabled filters are summed to generate a modulator output. When switching between modulation schemes, a smooth transition may be obtained by (1) providing a suitable data pattern for each filter to be enabled or disabled and (2) generating symbols for the new modulation scheme with an appropriate initial phase.
Abstract:
The present invention provides a single modulator capable of transmitting an input according to a first and a second modulation technique. The first modulation technique represents changes in the input using a first set of carrier waveform parameters, such as phase variations, whereas the second modulation technique represents changes in the input using a second set of carrier waveform parameters, such as alternative phase variations. The present invention performs both modulation techniques by expressing the 10 second set of carrier waveform parameters as a subset of the first set of carrier waveform parameters. In a preferred embodiment, the first and second modulation techniques comprise the π/2-offset 2PSK (a good approximation of differential GMSK) and 3π/8-offset 8PSK (also known as EDGE) modulation techniques.
Abstract:
Cardiac stimulation control and communication system, including a pacemaker, having a processor for processing input signals to and/or from one or more electrodes located in a heart. A signal processing network for receiving input signals and for providing a Time Division Multiple Access (TDMA), a filtered signal, spread spectrum signal and/or Orthogonal Frequency Division Multiplex (OFDM) signal to a selector for selection and transmission. In-phase and quadrature-phase cross-correlated spread spectrum signals are provided to a modulator for modulation and transmission of signals received from one or more electrodes or probes or sensors used by a patient. An implantable cardiac stimulation device and a telemetry transmitter and telemetry wired or wireless receiver, for transmission and reception of wireless and or wired signals, wherein said telemetry signals are for monitoring and/or controlling the implantable cardiac stimulation device. A pacemaker, receiver and demodulator for receiving and demodulating a Global Positioning System (GPS) receiver for receiving location finder signals or a receiver and demodulator for receiving and demodulating other than GPS signals and for providing location finder signals and for connecting said location finder signals to a transmitter for transmitting said location finder signals. A Time Division Multiple Access (TDMA) signal is provided to a non-quadrature modulator for non-quadrature modulation of TDMA signal and a filtered signal is processed into a cross-correlated spread spectrum in-phase and quadrature-phase filtered signal and provided to a quadrature modulator for quadrature modulation of said cross-correlated spread spectrum filtered signal. The transmitted signals are received and used by a nurse or other health professionals.
Abstract:
A process for receiving a GMSK-modulated signal which, for simultaneously transmitting two services, has an in-phase signal with a pseudo-random code that differs from the quadrature signal. By means of a decomposition filter in a reference signal branch detects one service independently of the other during the correlating with the received signal.
Abstract:
An apparatus, method and computer program, the apparatus including: a modulator including a first input for receiving a data signal and a second input for receiving an output signal from a phase locked loop wherein the modulator is for modulating the output signal from the phase locked loop using the data signal and providing the modulated signal to an output for connection to an amplifier; and a phase shifter configured to result in a predetermined phase shift to the modulated signal.
Abstract:
A power amplifier (106) has a linear operation mode for performing power amplification by use of a linear operating domain in an input-output power characteristic and a saturation operation mode for performing power amplification by use of a saturation operation domain in the input-output power characteristic. An amplitude control section (112) outputs gain control voltage data for controlling a gain of a gain control amplifier (105) and power control voltage data for controlling a source voltage of a power amplifier (106) in accordance with a transmission power setting value, thereby causing the power amplifier (106) to operate in any one of the operation modes. An amplitude correction section (122) outputs a reference correction value for correcting the gain control voltage data and the power control voltage data output from the amplitude control section (112) in accordance with the operation mode determined by a mode determination section (110) and temperature information detected by a temperature sensor (130).
Abstract:
Communication is provided which includes receiving a transmitted radio signal at a powerline wherein the powerline functions as a receiving antenna for the wirelessly transmitted radio signal. The powerline is coupled to an input of a radio receiver using a coupler to communicate the radio signal to the radio receiver. For calibration purposes a second antenna not coupled to powerline may be used. A method for powerline communication across transformers, open circuit breakers, and other devices is also provided. In addition, a method of monitoring a device connected to a powerline is provided.