Class / Patent application number | Description | Number of patent applications / Date published |
375303000 | Frequency shift keying | 27 |
20080253480 | Continuously Variable Phase Frequency Shift Keying - Method for modulating an RF signal includes the steps of modulating an RF signal using frequency shift keying (FSK) modulation to define a plurality of symbols ( | 10-16-2008 |
20090154597 | Linear and Non-Linear Dual Mode Transmitter - A transmitter includes a dual mode modulator and an amplifier coupled to the dual mode modulator. The dual mode modulator implements a linear modulation scheme during a first mode of the modulator to produce a variable envelope modulated signal. The dual mode modulator implements a non-linear modulation scheme during a second mode of the modulator to produce a constant envelope modulated signal. The amplifier is biased as a linear amplifier during the first mode of the modulator and is biased as a non-linear amplifier during the second mode of the modulator. A feed-forward connection between the dual mode modulator and the amplifier is used to indicate a change in modulation mode and to adjust the bias of the amplifier. A power of the constant envelope modulated signal is increased such that an operating point of the amplifier remains substantially constant during the first and second modes of the modulator. | 06-18-2009 |
20090268847 | PHASE LOCKED LOOP MODULATOR CALIBRATION TECHNIQUES - A method for calibrating a phase locked loop begins by determining a gain offset of a voltage controlled oscillator of the phase locked loop. The processing then continues by adjusting current of a charge pump of the phase locked loop based on the gain offset. | 10-29-2009 |
20100246718 | STTC Encoder for Single Antenna WAVE Transceivers - An encoder in a transmitter uses space-time trellis coding. An input bitstream is multiplexed to produce in parallel a set of output bitstreams. A multiplier applies a code generating weight to each output bitstream, which are combined, mapped and transmitted by a single antenna. | 09-30-2010 |
20100246719 | APPARATUS FOR TRANSMITTING AND RECEIVING A SIGNAL AND METHOD OF TRANSMITTING AND RECEIVING A SIGNAL - A method for transmitting and receiving a signal and an apparatus for transmitting and receiving a signal are disclosed. The method for receiving the signal includes receiving (S | 09-30-2010 |
20110129034 | FSK SIGNAL MODULATOR FOR PRODUCING A BINARY FSK SIGNAL - An FSK signal modulator is provided in a transmitter which receives desired information to be transmitted on its input and which modulates the information to be transmitted to transmit a binary FSK signal. A counter counts a value of addition with the value of addition modified in accordance with a predetermined rule, depending on the value specified by the information to be transmitted, and for holding the counted value . The count value is determined by a threshold value decision circuit with respect to a threshold value. The result from the decision is output in the form of binary FSK signal. An FSK signal modulator will be provided which is simplified in circuit constitution. | 06-02-2011 |
20120076240 | APPARATUS AND METHOD FOR DATA COMMUNICATION USING RADIO FREQUENCY - A data communication apparatus using a radio frequency and a data processing method thereof are provided. A first communication apparatus frequency shift keying and phase shift keying modulates and transmits data from a service server to a radio frequency band. A second communication apparatus modulates, demodulates, and outputs the data. The data communication apparatus using a radio frequency, includes: a data modulation module frequency shift keying and phase shift keying modulates data to a radio frequency band to generate a modulated data signal; and a data transmission module transmitting the modulated data to another communication apparatus. | 03-29-2012 |
20130336425 | APPARATUS AND METHOD FOR PERFORMING PROPERRIZING FREQUENCY SHIFT(P-FRESH) VECTORIZING - To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method for performing properizing frequency shift (p-FRESH) vectorizing, the method comprising: converting a scalar-valued input signal of length L into a 2L-by-1 vector-valued output signal including complex conjugate signal of the input signal; modulating the input signal and the complex conjugate signal each with L different carriers; and bandpass filtering the modulated signal to form the output signal, wherein the output signal is band-limited to a half-Nyquist zone (F | 12-19-2013 |
20140072077 | TRANSMITTER - According to embodiments of the present invention, a transmitter is provided. The transmitter includes a frequency shift keying (FSK) circuit, and a phase shift keying (PSK) circuit coupled in series to the FSK circuit, wherein the FSK circuit is configured, in a first mode of operation, to provide a FSK modulated signal to the PSK circuit, and, in a second mode of operation, to provide a fixed frequency signal to the PSK circuit, and wherein the PSK circuit is configured, in the first mode of operation, to transmit the FSK modulated signal, and, in the second mode of operation, to provide a PSK modulated signal based on the fixed frequency signal received from the FSK circuit. | 03-13-2014 |
20140219393 | METHOD FOR MODULATING NAVIGATION SIGNAL - The present invention provides a method for modulating a navigation signal, comprising: multiplying a data channel difference signal between upper and lower sidebands by a sine binary subcarrier to obtain an odd timeslot baseband signal of a branch Q, and multiplying a data channel sum signal of the upper and lower sidebands by a cosine binary subcarrier to obtain an odd timeslot baseband signal of a branch I of the data channel; multiplying a pilot channel difference signal between the upper and lower sidebands by the sine binary subcarrier to obtain an even timeslot baseband signal of the branch Q, and multiplying a pilot channel sum signal of the upper and lower sidebands by the cosine binary subcarrier to obtain an even timeslot baseband signal of the branch I; and performing QPSK modulation on the baseband signals of the branch I and branch Q to obtain a TD-AltBOC modulation signal. The present invention can implement transmission of different navigation services at two adjacent frequency bands, and each navigation service comprises a data channel and a pilot channel. The navigation signal of each sub-band may be received independently, or signals of the upper and lower sidebands may be jointly received to obtain high-precision navigation performance. | 08-07-2014 |
20140269993 | METHOD AND APPARATUS FOR GENERATING A PLURALITY OF MODULATED SIGNALS - A method and an apparatus provide a plurality of modulated signals by frequency shifting an output signal of a carrier signal generation circuit for obtaining a first carrier signal and a second carrier signal, and by modulating the first and second carrier signals. | 09-18-2014 |
20140362952 | Frequency Shift Keying Transmitter - According to embodiments of the present invention, a frequency shift keying transmitter is provided. The frequency shift keying transmitter includes a logic gate arrangement that produces an output signal having a frequency that depends on input signals to the logic gate arrangement, a clock generator coupled to the logic gate arrangement, the clock generator adapted to produce a clock signal, and a sampling arrangement coupled to the logic gate arrangement, the sampling arrangement adapted to receive a data signal, wherein the sampling arrangement is configured to sample the clock signal to generate periodic waveforms delayed from each other by an interval determined by the point the clock signal is sampled, wherein the sampling arrangement is configured to be controlled by the data signal to have the logic gate arrangement select periodic waveforms that are delayed from each other by one of a set of intervals associated with the data signal, to be used as the input signals to the logic gate arrangement to produce the output signal. | 12-11-2014 |
20150071384 | METHOD AND ARRANGEMENT IN A DIGITAL SUBSCRIBER LINE SYSTEM - Transmitting and receiving arrangements and methods in a Digital Subscriber Line (DSL) system having a plurality of modems and vectored transmission capability. A first part of an available frequency band is reserved for vectored DSL transmission and reception using modems operating in the first part of the frequency band. The remaining, second, part of the available frequency band is reserved for both vectored and non-vectored transmission using modems operating in the second part of the frequency band. | 03-12-2015 |
20150341195 | DEVICE AND METHOD OF SEQUENCE DETECTION FOR FREQUENCY-SHIFT KEYING - A device for determining an encoded data sequence as a determined data sequence is provided. The encoded data sequence is encoded by an input signal frequency-modulated in accordance with a modulation rule. The encoded data sequence has a plurality of data elements. The device has a filter unit for filtering the frequency-modulated input signal in order to obtain a first frequency-filtered channel signal and a second frequency-filtered channel signal. Additionally, the device has an evaluation unit configured to associate, for each known data sequence of a quantity of known data sequences, two channel-specific signal-to-noise distance values to this known data sequence. Furthermore, the evaluation unit is configured to select from the plurality of known data sequences a known data sequence as the determined data sequence to which is associated a channel-specific signal-to-noise distance value which is greater than another channel-specific signal-to-noise distance value associated to another one of the known data sequences. | 11-26-2015 |
20160013960 | RADIO TRANSMISSION METHOD AND ADAPTED RADIO TRANSMITTER | 01-14-2016 |
20160050048 | APPARATUS FOR TRANSMITTING BROADCAST SIGNALS, APPARATUS FOR RECEIVING BROADCAST SIGNALS, METHOD FOR TRANSMITTING BROADCAST SIGNALS AND METHOD FOR RECEIVING BROADCAST SIGNALS - A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder encoding service data, a time interleaver interleaving the encoded service data, a mapper mapping the interleaved service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, wherein the frequency interleaver calculates an interleaving address for the different interleaving-seed based on a main-PRBS sequence and a cyclic shifting value, a modulator modulating the frequency interleaved data by an OFDM scheme and a transmitter transmitting the broadcast signals having the modulated data, wherein an interleaving-seed is generated based on a cyclic shift value and an FFT size of the modulating. | 02-18-2016 |
20160182190 | BROADCAST-SIGNAL TRANSMITTER/RECEIVER AND METHOD FOR TRANSMITTING/RECEIVING BROADCAST SIGNALS | 06-23-2016 |
375305000 | Minimum shift keying | 6 |
20080273625 | METHOD AND A SYSTEM FOR TRANSFERRING AMR SIGNALING FRAMES ON HALFRATE CHANNELS - Transference of signaling frames on GERAN (GSM/EDGE radio Access Network) half rate channels utilizing a modulation scheme carrying n bits in one symbol. In order to be able to utilize the existing channel coding developed for channels with different modulations and to avoid high rate convolutional and block codes, the AMR signaling frame to be transferred is coded using a coding procedure defined for a GSM half rate channel utilizing a GMSK modulation scheme, the coding procedure outputting a coded output stream. In response to said coding, each bit of the coded output stream is repeated n times, whereby a repeated bit stream is obtained, and symbols to be transmitted are formed from the repeated bit stream. | 11-06-2008 |
20090168921 | TRANSMISSION SPECTRA - The present invention relates to transmitter devices and transmission methods of transmitting a modulated GMSK- or EDGE-signal in a transmission system, wherein normally the pulse shaping follows the given rules of standards for these mobile radio systems. The amount of TX spectra in the adjacent TX channels is predetermined by these rules. A second filtering step is suggested to be introduced for attenuating predetermined unwanted spectra in the adjacent transmit channels. A second goal of this suggestion is to reduce spectra at adjacent TX channels also at cases of nonlinearity at the TX Power Amplifier of the RF transmitter Nothing must be changed in standards of mobile communication systems, for example GSM. | 07-02-2009 |
20100260290 | SMOOTH MODULATION SWITCHING - A transmitter comprises a channel encoder to encode data bits; a modulator to modulate the encoded data bits, wherein the modulator selects one of a first modulation scheme and a second modulation scheme for each of a plurality of time slots; wherein, for each time slot, the channel encoder: includes a prefix and a suffix at the beginning and end, respectively, of the encoded data bits corresponding to the respective time slot, the prefix and the suffix being selected based on the selected modulation scheme for the respective time slot; and passes the prefix, the encoded data bits, and the suffix to the modulator; wherein, for each time slot, the modulator: modulates the prefix, the encoded data bits, and the suffix received from the channel encoder according to the selected modulation scheme for the respective time slot; and applies a window function to the prefix and the suffix. | 10-14-2010 |
20140029697 | GMSK-Based Modulation in a Wireless Local Area Network - A method includes modulating, at a first wireless device, a first signal based on a Gaussian minimum shift keying (GMSK) modulation scheme to generate a modulated signal. The method also includes amplifying, at the first wireless device, the modulated signal using a nonlinear power amplifier to generate an output signal. The method further includes transmitting, from the first wireless device to a second wireless device, an output signal generated based on the modulated signal via a wireless local area network (WLAN) that is compliant with an Institute of Electrical and Electronics Engineer (IEEE) 802.11ah specification. | 01-30-2014 |
20140307833 | COMMUNICATION USING CONTINUOUS-PHASE MODULATED SIGNALS - Embodiments of a circuit are described. In this circuit, a modulation circuit provides a first modulated electrical signal and a second modulated electrical signal, where a given modulated electrical signal, which can be either the first modulated electrical signal or the second modulated electrical signal, includes minimum-shift keying (MSK) modulated data. Moreover, a first phase-adjustment element, which is coupled to the modulation circuit, sets a relative phase between the first modulated electrical signal and the second modulated electrical signal based on a phase value of the first phase-adjustment element. Additionally, an output interface, which is coupled to the first phase-adjustment element, is coupled to one or more antenna elements which output signals. These signals include a quadrature phase-shift-keying (QPSK) signal corresponding to the first modulated electrical signal and the second modulated electrical signal. | 10-16-2014 |
20160156489 | MILLIMETER-WAVE MODULATION DEVICE | 06-02-2016 |
375306000 | One oscillator | 3 |
20090080568 | SIGNAL GENERATOR WITH ADJUSTABLE PHASE - Phase of an output signal is based on comparison of an oscillating signal with an adjustable threshold. Here, adjustment of the threshold results in a corresponding adjustment of the phase of the output signal. For example, the adjustable threshold may comprise an adjustable bias signal for a transistor circuit whereby the oscillating signal is provided as an input to the transistor circuit and the output of the transistor circuit provides the output signal. In some aspects these phase adjustment techniques may be employed to provide one or more tunable multiphase clocks. | 03-26-2009 |
20120069932 | Radio transmitter - A radio transmitter includes a signal processing circuit splitting a basic modulating signal into first and second modulating signals and outputting the first and second modulating signals. A PLL decides a fundamental wave. A VCO forms a portion of the PLL and modulates the fundamental wave decided by the PLL in accordance with a voltage of the first modulating signal outputted from the signal processing circuit. A PLL circuit forms a portion of the PLL and varies a frequency division ratio to modulate the fundamental wave decided by the PLL in accordance with the second modulating signal outputted from the signal processing circuit. | 03-22-2012 |
20120170682 | Dual Channel Transmission - There is provided a solution for dual channel transmission in a radio communication device. Both transmission signals to be transmitted on different channels are mixed two times by using oscillator signals having the same frequencies for both transmission signals, and the transmission circuitry is arranged to process the signals so that the transmission signals are nevertheless up-converted to different frequency channels. | 07-05-2012 |
375307000 | Two or more oscillators | 1 |
20130028350 | RADIO TRANSMITTING APPARATUS - The radio transmitting apparatus includes a first initial phase value setting circuit that sets, in the first modulator, an initial value of the phase of the first modulated signal, which is a value at the start of the modulation according to the first modulation scheme. The radio transmitting apparatus includes a second initial phase value setting circuit that sets, in the second modulator, the phase stored in the phase storing circuit as an initial value of the phase of the second modulated signal, which is a value at the start of the modulation according to the second modulation scheme. The radio transmitting apparatus includes a signal gathering circuit that selects and outputs the first modulated signal output from the first modulator and then selects and outputs the second modulated signal output from the second modulator. | 01-31-2013 |