Abstract: A distribution system that may include multiple radio frequency outputs, a group of channel processing and digital up conversion units, and a set of digital to analog converters. The set of digital to analog converters is coupled between the group of channel processing and digital up conversion units and the multiple radio frequency outputs. The group of channel processing units may be arranged to generate multiple digital multiplexes and to provide the multiple digital multiplexes to the set of digital to analog converters. Each digital multiplex comprises digital broadcast channels provided from at least two channel processing and digital up conversion units. The set of the digital to analog converters may be arranged to convert the multiple digital multiplexes to provide multiple analog multiplexes and to provide the multiple analog multiplexes to the multiple radio frequency outputs.

Abstract: This application discussed trajectory modification techniques for polar transmission architectures. In an example, a method can include receiving a first sample, determining an absolute phase angle change between the first sample and a third sample, and if the first angle change is greater than a threshold phase angle, adjusting phase information of a second sample to provide a modified second sample such that a trajectory associated with the first sample, the modified second sample and the third sample passes through an origin. In an example, the second sample can be received prior to receiving the first sample, and the third sample can be received prior to receiving the second sample.

Abstract: Control circuitry for use in generating a local oscillator (LO) signal is provided. Synthesizer control circuitry is configured to control synthesizer circuity to generate an analog oscillator signal having a first frequency at which phase noise is minimized. DS control circuitry is configured to generate a control word or message to cause DS circuitry to generate a digital DS signal having a desired frequency when the DS circuitry is clocked by the oscillator signal having the first frequency. The desired frequency is proportional to the LO signal frequency. The digital DS signal generated by the DS circuitry is used to generate the LO signal. Thus the first frequency used to clock the DS circuitry is selected to optimize the oscillator rather than having some relationship to the LO frequency. In addition, a single synthesizer may be used in order to simultaneously generate many LO signals.

Abstract: A technique of mapping data, suitable for Peak to Average Power Ratio (PAPR) reduction while transmitting data portions via a communication channel limited by a peak power ppeak. The mapping is performed by utilizing a Markovian symbol transition probability distribution with quantized probabilities and by selecting, for a specific data portion at a current channel state, such a binary symbol (called thinned label) which allows puncturing one or more bits in the thinned label's bit sequence before transmission.

Abstract: A method and system for transmitting information which is obtained from a peripheral object when an interactive service between devices is performed, and a device, are provided. The information transmission method includes: obtaining first information which is stored in a peripheral object of an electronic device via short distance communication with the peripheral object when an interactive service is performed between the electronic device and the at least one external device; generating second information that is to be transmitted to the at least one external device based on the obtained first information; and transmitting the second information to the at least one external device via the interactive service.

Abstract: An apparatus and a method. The apparatus includes passive mixers, wherein each of the passive mixers includes a first input for receiving BBI, a second input for receiving BBI, a third input for receiving BBQ, a fourth input for receiving BBQ, a fifth input for receiving a first clock signal with a unique phase shift within one of the passive mixers, a sixth input for receiving a second clock signal with a unique phase shift within one of the passive mixers, a seventh input for receiving a third clock signal with a unique phase shift within one of the passive mixers, an eighth input for receiving a fourth clock signal with a unique phase shift within one of the passive mixers, and at least one output; and a voltage-domain vector summation array connected to the output of each of the passive mixers.

Abstract: The programmable frequency control system presented herein provides frequency programmability and phase noise reduction for signals generated by a plurality of frequency programmable phase-locked loops (PLLs). In general, a modulated data stream input to each of the plurality of PLLs controls the frequency of the signal output by the PLLs. The solution presented herein reduces the phase noise by introducing a time shift to the modulated data stream applied to at least some of the PLLs so that at least some of the PLLs receive time-shifted versions of the modulated data stream relative to other PLLs. In so doing, the solution presented herein decorrelates the quantization noise generated by the plurality of frequency programmable PLLs.

Abstract: A coding method for data compression of a power spectra of an optoelectronic component and a decoding method are disclosed. In an embodiment, a coding method includes providing a power spectrum, sampling the power spectrum at particular sampling wavelengths in order to provide a discrete source spectrum, indexing the discrete source spectrum in order to provide a source graph having discrete source values, producing an image graph having discrete image values by transforming the source graph from a source range into an image range with a discrete frequency transform, performing compression of the image graph, and digitizing the compressed image graph in order to produce compressed spectral data.

Abstract: An integrated circuit according to the present invention includes a transmission circuit that transmits a millimeter wave signal, a detection section that detects the millimeter wave signal, an output terminal connected to an output of the transmission circuit via a first wire, a detection terminal provided adjacent to the output terminal and connected to an input of the detection section via a second wire, a first grounding terminal provided adjacent to the output terminal and connected to the transmission circuit via a first grounding wire for grounding the transmission circuit and a second grounding terminal provided adjacent to the detection terminal and connected to the detection section via a second grounding wire for grounding the detection section, wherein the first grounding wire and the second grounding wire are arranged around the first wire and the second wire.

Abstract: A clocking arrangement for transceivers in an integrated circuit device includes a plurality of fractionally adjustable phase-locked loops. Each respective one of the fractionally adjustable phase-locked loops generates a respective transmit frequency for a respective one of the transceivers. There is a respective clock-data recovery module in a receive portion of each respective one of the transceivers, and each respective clock-data recovery module includes a respective fractionally adjustable frequency-lock loop. There is a reference clock input providing a reference clock for a plurality of the fractionally adjustable phase-locked loops and the fractionally adjustable frequency-lock loops. The reference clock input can be a sole reference clock input providing a reference clock for all of the adjustable phase-locked frequency-lock loops.

Abstract: Apparatuses (and methods of manufacturing same), systems, and methods concerning polyphase digital filters are described. In one aspect, an apparatus is provided, including at least one pair of subfilters, each having symmetric coefficients, and a lattice comprising two adders and feedlines corresponding to each of the at least one pair of subfilters, each having symmetric coefficients. In one aspect, the apparatus is a polyphase finite impulse response (FIR) digital filter, including an interpolator and a decimator, where each of the interpolator and the decimator have at least one pair of subfilters, each having symmetric coefficients, and a lattice comprising two adders and feedlines corresponding to each of the at least one pair of subfilters, each having symmetric coefficients.

Abstract: Systems and methods are directed to phase modulation of polar coordinates in a transmitter of wireless signals, to achieve high transmit power levels while meeting spectral mask and EVM requirements. An input signal is mapped to a sequence of modulation frequency (e.g., O-QPSK to MSK) to generate a mapped signal. A digital frequency shaping filter is applied to the mapped signal to generate a shaped signal. An adaptive rounding algorithm is applied to the shaped signal to generate a reduced bit-width signal. A digital frequency synthesizer is applied to the reduced bit-width signal to generate an analog waveform for transmission.

Abstract: The present invention discloses a signal modulation method, including: demultiplexing an input signal into 2N sub-signals; grouping every two of the 2N sub-signals into a pair; performing filtering on two sub-signals in each pair; performing carrierless amplitude phase (CAP) modulation on the two sub-signals in each pair; modulating the two sub-signals in each pair to a same frequency band, to generate N pairs of CAP signals, where frequency bands of different pairs of sub-signals are different, and a spacing between center frequencies of two neighboring frequency bands is greater than or equal to an average value of baud rates of sub-signals corresponding to the two neighboring frequency bands; and combining the N pairs of CAP signals, and performing electro-optic modulation on a signal obtained after the combining. A signal demodulation method corresponding to the signal modulation method is further disclosed.

Abstract: The continuous demand for capacity and the limited available spectrum in wireless and wired communication has led to reliance on advanced modulation techniques to dramatically increase the number of bits per hertz per second. This demand in capacity and using the higher order constellations shorten the link range, and as a result, system gain becomes an important characteristic. The modulation techniques described here improve the system gain by, e.g., as much as 2.5 dB in high order modulations such as 4096-QAM. The modulation techniques include reducing the peak to average ratio and adding shaping gain. These techniques dramatically improve the system capacity, system gain, power consumption and system cost.

Abstract: A transmitter comprising a phase computation circuit configured to receive a complex baseband signal comprising an in-phase signal and a quadrature signal forming an I-Q data pair, and determine a first rotation angle and a second rotation angle based on the I-Q data pair. The transmitter further comprises a modulation circuit coupled to the phase computation circuit configured to determine a three-level modulated waveform having a lower negative level, a zero level and a higher positive level, based on the first rotation angle and the second rotation angle; and generate the three-level modulated waveform based on the determination.

Abstract: There is provided a signal transmission device including reception processing units for respective channels, so as to enable multichannel transmission by dividing frequency bands. The total number of channels is equal to or greater than three. When full-duplex two-way communication is applied in any combination of two channels, one of reception processing unit include a signal suppressing unit configured to suppress a signal component of a channel other than a self channel.

Abstract: An example apparatus for interfacing between automatic test equipment (ATE) and a device under test (DUT) includes: multiple stages arranged in sequence between the ATE and the DUT, where each of the multiple stages includes a driver, at least two of the multiple stages each includes a filter, each filter is arranged between two drivers, and each filter is configured to reduce jitter produced by a preceding driver in a signal transmitted between the ATE and the DUT.

Abstract: The continuous demand for capacity and the limited available spectrum in wireless and wired communication has led to reliance on advanced modulation techniques to dramatically increase the number of bits per hertz per second. This demand in capacity and using the higher order constellations shorten the link range, and as a result, system gain becomes an important characteristic. The modulation techniques described here improve the system gain by, e.g., as much as 2.5 dB in high order modulations such as 4096-QAM. The modulation techniques include reducing the peak to average ratio and adding shaping gain. These techniques dramatically improve the system capacity, system gain, power consumption and system cost.

Abstract: Apparatus for generating an RF signal for use in RF signal detection is described. The apparatus comprises at least one processor configured to generate a set of IQ data based on at least one set of weighted IQ data, each set of weighted IQ data having a respective weight and a circuit configured to generate an RF signal using the set of IQ data. The at least one processor is configured to calculate each respective weight in dependence upon location of a signal detector or an antenna associated with the RF signal detector.

Abstract: Radio frequency (RF) duplexing devices and methods of operating the same are disclosed. In one embodiment, an RF duplexing device includes a transmission port, a receive port, a first duplexer, and a second duplexer. The first duplexer is coupled to the transmission port and the receive port, and is configured to provide a first phase shift from the transmission port to the receive port. The second duplexer is also coupled to the transmission port and the receive port. However, the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port. By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation without needing to introduce significant insertion losses.

Abstract: Embodiments of the present invention provide an optimizing apparatus and method for a pulse shaping filter and a transmitter. The apparatus is configured to determine an initial peak-to-average power ratio threshold of the pulse shaping filter, and determine an initial filter coefficient of the pulse shaping filter according to the initial peak-to-average power ratio threshold; determine a constraint condition for optimizing the pulse shaping filter according to the initial peak-to-average power ratio threshold and the initial filter coefficient of the pulse shaping filter; wherein the constraint condition comprises a threshold constraint in a filter coefficient sign domain; and adjust the initial peak-to-average power ratio threshold and the initial filter coefficient of the pulse shaping filter in a case where the constraint condition is satisfied, until a predefined condition is satisfied, so as to obtain an optimized filter coefficient of the pulse shaping filter.

Abstract: At least one tone is generated. An output signal is generated in response to an input signal and the at least one tone. The output signal is modulated. The input signal and the at least one tone are represented in the modulated output signal. The at least one tone is outside a bandwidth of the input signal as represented in the modulated output signal. The modulated output signal is amplified. The at least one tone in the amplified signal is attenuated after the amplifying.

Abstract: A radio apparatus includes a baseband signal generator to generate a baseband signal; a sine wave substituting device to substitute a transition part of the baseband signal in which a logic level switches from “0” to “1” or “1” to “0” with a sine wave represented with multi-values; and a delta sigma modulator to modulate the signal represented in the multi-values into a binary signal.

Abstract: A method modulates data for optical communication by first encoding the data using a forward error correction (FEC) encoder to produce encoded data, which are encoded using a block encoder to produce block encoded data such that Lee distances between code words that represent the block encoded data are increased. The block encoded data are mapped to produce mapped data such that Euclidian distances between the constellation points are increased. Then, the mapped data are modulated in a transmitter to a modulated signal for an optical channel.

Abstract: Novel tools and techniques are provided for delivering plain old telephone service (“POTS”) telephony over high speed data networks. In particular, various embodiments provide tools and techniques for concurrent transmission of POTS voice signals and data signals over the same wire(s) of high-speed data lines or data cables. Various systems and methods might, in some instances, utilize upbanding or rebanding of the POTS voice band to a higher frequency band above the data stream band spectrum for transport of voice concurrent with data over the same wire(s) in the cable. The system might comprise interface devices at either end of a cable segment, one interface device to reband the voice signal and to combine the voice signal with the data signal for each dual-transport wire in the cable, and another interface device at the other end to separate the voice signal from the data signal.

Abstract: Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. In preferred embodiments, compensation is implemented in the transmitter, using a look-up-table and digital-to-analog converter to generate an electrical predistorted signal. The electrical predistorted signal is then used to modulate an optical source to generate a corresponding predistorted optical signal for transmission through the optical communications system.

Abstract: A radio frequency (RF) amplification system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. The system may include a single digital-to-RF modulator and a power divider to drive multiple power amplifiers. A power combiner may also be provided to combine outputs of the power amplifiers. In at least one implementation, amplitude adjustment of the RF input signals of the one or more power amplifiers may be used to provide transmit power control and/or power backoff.

Abstract: An optical modulator is described, comprising—an optical splitter to receive an optical carrier signal and split it into sub-signals; modulation assemblies, each comprising a binary optical modulator to apply a binary phase shift keyed (BPSK) modulation to a respective optical sub-signal to form a BPSK modulated optical sub-signal. Modulation assemblies comprise a phase-shifter, each to apply a phase shift to the respective BPSK modulated optical sub-signal in dependence on a pre-selected modulation format; an encoding apparatus to receive communications traffic to map into symbols, and to generate and transmit a respective drive signal to the optical modulator of a modulation assembly, each drive signal to cause the optical modulator to apply said BPSK modulation, to encode the symbols onto the respective optical carrier sub-signal; and a combiner to receive each BPSK modulated optical sub-signal to form an output optical signal having said multilevel modulation format.

Abstract: In signal processing of the present disclosure, an abnormal correction value as a correction value for correcting a quadrature error that occurs in quadrature modulation is output in malfunction determining processing, and a normal correction value as the correction value is output in calibration processing. The presence or absence of malfunction in the signal processing is determined on the basis of the levels of carrier leak and image leak of the quadrature modulated signal.

Abstract: The subject matter described herein relates to supply modulation for power amplification. In one embodiment, the voltage level of the envelope with a tunable threshold voltage. The high level part of the envelope above the threshold voltage is maintained and amplified, for example, by the linear amplification process. On the other hand, the low level part of the envelope is replaced with the constant low voltage level. In amplification, the shaped low level part can be prompted to the predefined low supply voltage which may be directly output to the RFPA. By eliminating complicated amplification process on the lower level part of the envelope, the efficiency and bandwidth of the supply modulation can be improved and the circuitry can be simplified, without introducing any timing mismatch or delays.

Abstract: Provided is a working point controlling device and method for applying MZ modulator, which includes: a light modulator; a transimpedance amplifier, transmits current outputted by PD of the modulator into voltage signal; a low-noise amplifier, detects low-frequency signal and amplifies the signal, in order to improve the signal/noise ratio; a high Q band-pass filter, detects error signal and amplifies the signal, in order to improve the signal/noise ratio; a first power level conditioning, performs power level condition on error signal of phase, in order that signal output meets A/D input rang; a micro processor, generates low-frequency signal and finishes software synchronization detection wave and ratio integration PI adjusting algorithm; a second power level conditioning, finishes D/A output voltage condition, in order that D/A output is able to meet direct current offset whole controlling range power voltage range of the light modulator.

Abstract: A 2n-QAM (e.g. 16-QAM) optical modulator comprising cascaded I-Q modulators. The first I-Q modulator applies 2n-2 (e.g. 4) QAM to an optical signal, having a constellation diagram with the 2n-2 (e.g., 4) constellation points located in quadrant I. The second I-Q modulator subsequently applies a quaternary phase-shift keying (QPSK) modulation scheme to the optical signal, thereby rotating the constellation points of the 2n-2-QAM modulation scheme to quadrants II, III and IV, to produce a 2n-QAM modulation constellation diagram. The rotation causes the 2n-QAM modulator to inherently apply four quadrant differential encoding to the optical signal. A method of 2n-QAM optical modulation is also provided and optical signal transmission apparatus comprising the 2n-QAM optical modulator.

Abstract: An output of a transmitter is looped back to an input of a receiver during a first time period while applying a frequency offset between the transmitter and the receiver. A first imbalance between an in-phase (I) branch and a quadrature-phase (Q) branch in the receiver is determined based on a signal received at the receiver during the first time period. The receiver is calibrated based on the determined first imbalance. After calibrating the receiver, the output of the transmitter is looped back to the input of the receiver during a second time period during which the frequency offset is not applied. A second imbalance between an I branch in and a Q branch in the transmitter is determined based on a signal received at the receiver during the second time period while the frequency offset is not applied. The transmitter is calibrated based on the determined second imbalance.

Abstract: A hybrid polar I-Q transmitter includes an I-Q derivation circuit configured to receive a first and second I-Q data components comprising a first I-Q data pair, and generate a first and second I-Q derived data components comprising a second I-Q data pair, respectively, based thereon, by utilizing a resolution information of a digital-to-analog converter (DAC) and a design criteria. The I-Q derivation circuit is further configured to determine a residual angle corresponding to a phase angle difference between the first I-Q data pair and the second I-Q data pair. The hybrid polar I-Q transmitter further comprises a modulation circuit configured to compensate the determined residual angle corresponding to the phase angle difference between the first I-Q data pair and the second I-Q data pair.

Abstract: Radio frequency (RF) duplexing devices and methods of operating the same are disclosed. In one embodiment, an RF duplexing device includes a transmission port, a receive port, a first duplexer, and a second duplexer. The first duplexer is coupled to the transmission port and the receive port, and is configured to provide a first phase shift from the transmission port to the receive port. The second duplexer is also coupled to the transmission port and the receive port. However, the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port. By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation without needing to introduce significant insertion losses.

Abstract: A sub-band processing system that reduces computational complexity and memory requirements includes a processor and a local or distributed memory. Logic stored in the memory partitions a frequency spectrum of bins into a smaller number of sub-bands. The logic enables a lossy compression by designating a magnitude and a designated or derived phase of each bin in the frequency spectrum as representative. The logic renders a lossless compression by decompressing the lossy compressed data and providing lost data based on original spectral relationships contained within the frequency spectrum.

Abstract: Methods, systems, and apparatuses can provide a plurality of RF channels and outputs using digital modulation and combining. In various examples, generation of digital IQ packetized data in combination with digital switching can increase the number of RF modulated channels, optimize broadcast transmission and/or provide transmission resiliency.

Abstract: A communication apparatus includes transmission circuitry and a frequency conversion unit. The transmission circuitry is configured to down-convert an input Intermediate Frequency (IF) signal using a transmit (TX) Local Oscillator (LO) signal so as to produce a TX baseband signal, to up-convert the TX baseband signal to produce an output Radio Frequency (RF) signal, and to send the output RF signal to an antenna. The frequency correction unit is configured to estimate a frequency of the TX baseband signal or of the input IF signal, and to adjust the TX LO signal based on the estimated frequency so as to cause the transmission circuitry to down-convert the input IF signal to a predefined target frequency.

Abstract: An amplifying device includes a first pre-distorter unit outputting a modulated signal obtained by adding a phase compensation amount and an amplitude adjustment amount to an input signal, a power amplifier inputting the modulated signal and outputting an output signal obtained by amplifying the modulated signal, a power supply voltage modulation unit modulating a power supply voltage, a second pre-distorter unit controlling the power supply voltage modulation unit on the basis of amplitude information on the input signal; and a control unit controlling an operation of the first pre-distorter unit and the second pre-distorter unit, wherein the control unit includes a phase control unit controlling the phase compensation amount by using a phase coefficient, a first amplitude control unit controlling the amplitude adjustment amount by using a first amplitude coefficient, and a second amplitude control unit controlling the operation of the second pre-distorter unit by using a second amplitude coefficient.

Abstract: Methods and systems are provided for timing synchronization for reception of highly-spectrally efficient communications. An example method may include, mapping, in a transmitter, a plurality of transmit bits to a plurality of symbols at a symbol rate that is based on an oscillator signal. The plurality of symbols may be processed via a filter. The processing may result in an inter-symbol correlated (ISC) signal. The oscillator signal may be frequency divided to generate one or more pilot signals having a frequency that is a sub-harmonic of a frequency of the oscillator signal. The pilot signal may be injected into the ISC signal. The injecting may result in an ISC signal with timing carrier. The ISC signal with timing carrier may be transmitted. Gain of the one or more pilot signals may be adjusted based on a spectral mask value associated with the transmitting.

Abstract: A digitally controlled oscillator that generates an output frequency according to input data includes a determination unit that determines whether the input data has a value that causes deterioration in a phase noise characteristic of the digitally controlled oscillator, an offset unit that offsets the input data when the input data is determined to have the value that causes deterioration in the phase noise characteristic, and a generating unit that generates the output frequency using the input data after being offset.

Abstract: This specification discloses a level de-multiplexed DSM based transmitter and a method for providing the same. Broadly embodiments of the present specification enable wireless transmitters that are based on multi-level de-multiplexed DSM. A three-level de-multiplexed DSM based transmitter is disclosed as an example. More generally, the use of m-level de-multiplexed DSM is also taught, the specification thereby being enabling for broader applications to a person skilled in the art. At least one of the efficiency and linearity of transmitters can be enhanced as required for specific applications by a person of skill in the art in view of this specification and the teachings of its disclosed embodiments.

Abstract: A memristor-based emulator including a memristor circuit for use in digital modulation that includes a first current feedback operational amplifier (CFOA) having multiple terminals in communication with a capacitor Cd and in further communication with a resistor Ri. A second CFOA having multiple terminals is in communication with the first CFOA and is adapted to be in further communication with a voltage vM to provide an input current iM for integration by a capacitor Ci. A nonlinear resistor is in communication with the second CFOA. A third CFOA having multiple terminals is in communication with the nonlinear resistor and is in further communication with the first CFOA and a resistor Rd. The third CFOA and the resistor Rd act as an inverting amplifier associated with the nonlinear resistor to increase a current gain to increase a difference between ON and OFF values of a resistance of a realized memristor.

Abstract: The present invention relates to a digital modulation method and a corresponding modulator. The modulator comprises a transcoder (110) followed by a FIFO register (120) and a 2-PSK modulator (130). The transcoder codes a binary word of fixed size into a code word of variable size using a transcoding table. The transcoding table codes at least one first binary word, leading to a first number of phase transitions at the output of the modulator, into a second word of size greater than that of the first word, leading to, at the output of the modulator, a second number of phase transitions less than the first number of phase transitions.

Abstract: A transmission device for transmitting a signal in a wireless communication system is provided. The transmission device includes: a serial-to-parallel converter configured to convert an input serial bit stream into a parallel bit stream having three bits; and a phase rotation symbol mapper configured to map the parallel bit stream to a symbol having phase rotation characteristics, wherein when the parallel bit stream includes first to third bits, the phase rotation symbol mapper maps the second and third bits to a complex variable and sequentially maps a real number part and an imaginary number part of the complex variable to the front part and the rear part of a symbol in this order or to the rear part and the front part of the symbol in this order.

Abstract: Provided is a method of generating a driving signal for driving a dual mode supply modulator for a power amplifier. The method includes obtaining an envelope of a complex baseband signal to be transmitted, comparing the envelope of the complex signal with a preset threshold value, when a current envelope of the complex signal is the preset threshold value or greater or when there is a result having the preset threshold value or greater in previous N comparisons, outputting a digital board output signal configured with a first logic level through a digital-to-analog converter; and when the current envelope of the complex signal is smaller than the preset threshold value and when there is no result having the preset threshold value or greater in the previous N comparisons, outputting a digital board output signal configured with a second logic level through the digital-to-analog converter.

Abstract: Embodiments of digital high-speed bi-phase modulator and method for bi-phase modulation are generally described herein. In some embodiments, the digital high-speed bi-phase modulator comprises a high-speed digital divider, a high-speed digital multiplexer, and matched signal paths provided between the divider and the multiplexer. The high-speed digital divider is configured to receive a carrier signal and generate complementary output signals. The high-speed digital multiplexer is configured to switch between the complementary output signals and generate a bi-phase modulated output at a carrier frequency (fc) modulated with a bi-phase code. The bi-phase code may be provided to control inputs of the multiplexer.

Abstract: Provided is a method for transmitting data in a communication or broadcasting system using a linear block code by generating a codeword by encoding input information data bits, interleaving the codeword; outputting modulation signal-constituting bits by bit-mapping the interleaved codeword using a bit-mapping table predetermined depending on a modulation scheme and a coding rate, outputting a modulation signal by modulating the modulation signal-constituting bits and transmitting the modulation signal via a transmit antenna.

Abstract: A new coded continuous phase modulation (CPM) scheme is proposed to enhance physical layer performance of the current DVB-RCS standard for a satellite communication system. The proposed CPM scheme uses a phase pulse design and combination of modulation parameters to shape the power spectrum of CPM signal in order to improve resilience to adjacent channel interference (ACI). Additionally, it uses a low complexity binary convolutional codes and S-random bit interleaving. Phase response using the proposed CPM scheme is a weighted average of the conventional rectangular and raised-cosine responses and provides optimum response to minimize frame error rate for a given data rate.

Abstract: A method for tuning a digital compensation filter within a transmitter includes: obtaining at least one resistance-capacitance (RC) detection result, wherein the digital compensation filter includes an RC compensation module; and tuning the digital compensation filter by inputting the RC detection result into the RC compensation module. For example, the RC detection result may correspond to a detected value representing a product of a resistance value and a capacitance value. In another example, the at least one RC detection result may be obtained by performing RC detection on at least a portion of the transmitter without individually measuring resistance values of resistors therein and capacitance values of capacitors therein. An associated digital compensation filter and an associated calibration circuit are also provided.