Abstract: The present disclosure relates to a method for transmitting at least one data packet between a first communication subscriber of a communication arrangement and at least one second communication subscriber of the communication arrangement, wherein the at least one data packet is transmitted from the first communication subscriber to the second communication subscriber at least partially via a bidirectional direct connection set up between a communication module of the first communication subscriber and a communication module of the at least one second communication subscriber, wherein the first communication subscriber and/or the at least one second communication subscriber is a vehicle, and wherein the at least one second communication subscriber feeds back a receipt for respective data of the at least one data packet to the first communication subscriber.

Abstract: The present disclosure relates to an apparatus and method of processing a digital signal, wherein an input signal is transformed into the frequency domain by applying a fast Fourier transformation (FFT) processing to obtain a transformed input signal. Positive and negative frequency components of the transformed input signal are separated and respective ones of the separated positive and negative frequency components are separately processed by respective digital filtering to obtain filtered frequency components. The filtered frequency components are combined in the frequency domain using a down-sampling operation for down-sampling the filtered frequency components from an input number of samples per symbol to a different output number of samples per symbol, and the combined output components are converted into the time domain by applying an IFFT processing.

Abstract: A noise reduction filter for data signals is implemented using two orthogonal coordinates comprising intensity and differential intensity values generated from sampling and sorting the data signals. A weighting function is used to amplify or reduce different portions of a data set distribution generated using the intensity and differential intensity values. The weighting function may also include scalar constants to further enhance the capability of the noise reduction filter. The noise reduction filter can be used to reduce the noise components or increase the useful signal components of a noisy data signal, thereby increasing the signal-to-noise ratio, and also increasing spectral resolution. The noise reduction filter can also be used in special cases where the intensity and frequency spectra of the noisy data signal are overlapping. The noise reduction filter may be used in various applications including spectroscopy and image processing, among others.

Abstract: A method by which a first network node cancels a self-interference signal when operating in a full duplex radio (FDR) mode in a wireless network can comprise the steps of: cancelling a self-interference signal on the basis of frequency synchronization estimation of the self-interference signal when frequencies of a reception signal received from a second network node and the self-interference signal are asynchronous; and estimating frequency synchronization of the reception signal by using a residual signal according to the cancellation of the self-interference signal, and detecting the reception signal on the basis of the frequency synchronization estimation of the reception signal.

Abstract: Systems, methods, and devices are provided for compensating for distortion of a contactless communication channel. The electronic device may include a radio frequency system that itself includes antenna to transmit and receive data using near-field communication (NFC) and an NFC signal processing circuitry. The NFC signal processing circuitry may receive an NFC signal via a communication channel formed between the electronic device and another electronic device and may determine a baseband reference waveform associated with the electromagnetic NFC signal and may determine an error between a portion of the electromagnetic NFC signal and the baseband reference waveform. Furthermore, the NFC signal processing circuitry may determine whether the error is outside of an acceptable error threshold range and, in response to the error being outside of the acceptable error threshold range, train a filter response of the NFC signal processing circuitry to estimate the communication channel.

Abstract: Signal cancellation is implemented by way of a non-linear filter model feeding to an FIR channel. Parameters defining each element are iteratively established, first by initially estimating the FIR channel then jointly estimating the two elements.

Abstract: A digital-to-analog conversion circuit (60) for converting a digital input sequence to an analog representation is disclosed. It comprises a first DAC, (100) wherein the first DAC (100) is of a capacitive voltage division type having a capacitive load (110). Furthermore, it comprises a second DAC (120) having a resistive load (130). An output (104) of the first DAC (100) and an output (124) of the second DAC (120) are connected, such that said capacitive load (110) and said resistive load (130) are connected in parallel.

Abstract: IQ mismatch correction for analog chain IQ mismatch impairments is based on a two-filter architecture. In either RX or TX, an IQmc mismatch corrector (digital chain) filters I and Q digital signals, and includes an I-path to receive the I signal, and a Q-path to receive the Q signal, and is configured with two filters: an in-path filter to filter either the I signal or the Q signal received in the same path; and a cross-path filter to filter either the I signal or the Q signal received in the other path. The IQmc mismatch corrector can include: an I-path delay element to provide a delay to the I signal corresponding to a delay through either the in-path filter or the cross-path filter; and a Q-path delay element to provide a delay to the Q signal corresponding to a delay through either the in-path filter or the cross-path filter.

Abstract: A Digital Time Processing (DTP) disclosed herein is contributing methods, systems and circuits for filtering out a phase noise of a timing referencing signal, producing a timing implementing signal from a free running local clock and time processing over time sensitive networks (TP TSN) enabling improved utilization of IEEE 1588 PTP and better accuracy of time distribution.

Abstract: A signal estimator for an OFDM radio receiver is configured to generate a signal power estimate for a reference signal received on a subcarrier from a plurality of OFDM subcarriers. The signal estimator generates a first channel estimate as a first function of a first set of one or more unfiltered reference-signal channel estimates, where the first set includes an unfiltered reference-signal channel estimate. It generates a second channel estimate as a second function of a second set of one or more unfiltered reference-signal channel estimates, where the second set has no unfiltered reference-signal channel estimate in common with the first set. The signal estimator then generates the signal power estimate by multiplying the first channel estimate with the second channel estimate, such that the generated signal power estimate does not increase with the absolute square of any of the unfiltered reference-signal channel estimates in the first and second sets.

Abstract: A data stream processing device includes a plurality of data providing units, a plurality of processing units, and control circuitry. The data providing units are configured to output data values received via a plurality of data inputs, respectively. The processing units are configured to generate data outputs based on the data values, respectively. The control circuitry includes a mode selection input and is configured to simultaneously provide data values of different data streams to the data inputs of the data providing units, respectively, in response to the mode selection input receiving a signal indicating a first mode, and simultaneously provide a plurality of successive groups of data values of one of the data streams to the data inputs of the data providing units, respectively, in response to the mode selection input not receiving the signal indicating the first mode.

Abstract: A signal receiving circuit, a memory storage device and a signal receiving method are provided. The signal receiving circuit includes an equalizer module, a clock and data recovery (CDR) circuit and a controller. The equalizer module is configured to receive a first signal and compensate the first signal to generate a second signal. The CDR circuit is configured to perform a phase locking on the second signal. The controller is configured to open or close a signal pattern filter of the CDR circuit according to the second signal, wherein the signal pattern filter is configured to filter a signal having a specific pattern in the second signal.

Abstract: Described herein are methods and systems of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system are thereby configured to detect acoustic events near or within the selected geographical area.

Abstract: Described herein are methods and systems of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system are thereby configured to detect acoustic events near or within the selected geographical area.

Abstract: A digital-to-time converter (DTC) assisted all digital phase locked loop (ADPLL) circuit is disclosed, which comprises: a DTC error compensator arranged to receive a phase offset signal being a processed output from a time-to-digital converter (TDC) circuit, the phase offset signal includes a DTC error corresponding to a phase difference between a reference clock signal processed by a DTC circuit and a feedback clock signal derived from an output signal of the ADPLL circuit. The compensator is arranged to process the phase offset signal for generating a digital signal representative of the DTC error, which is provided as an output signal. Also, the output signal is arranged to be subtracted from the phase offset signal to obtain a phase rectified signal of the phase offset signal.

Abstract: A system for retiming a multi-level signal that forms an eye diagram when plotted, such as a PAM4 signal that includes an equalizer configured to create an equalized signal and a first amplifier configured to amplify the equalized signal, responsive to a first amplifier control signal, to create a first amplified signal, and a second amplifier configured to amplify the equalized signal, responsive to a second amplifier control signal, to create a second amplified signal. An eye monitor processes the equalized signal, the first amplified signal, and the second amplified signal to create a first retiming clock phase signal and a second retiming clock phase signal, which control sampling times for flip-flops. One or more delays and one or more emphasis modules are configured to delay and introduce emphasis into an output from the flip-flops, the resulting signals are combined in a summing junction to create the retimed signal.

Abstract: Embodiments of this disclosure provide an apparatus and method for estimating polarization skew. The method includes: acquiring a plurality of coefficients of an adaptive equalizer of a receiving device; the plurality of coefficients of the adaptive equalizer include at least polarization skew of a transmitting device and polarization skew of the receiving device; and calculating the polarization skew of the transmitting device and the polarization skew of the receiving device according to the plurality of coefficients of the adaptive equalizer.

Abstract: Described are apparatus and methods for high frequency clock generation. A circuit includes a phase frequency detector (PFD) which outputs differential error clocks based on comparison of differential reference clocks and differential feedback clocks, which are at a first frequency. A controlled oscillator (CO) connected to the PFD, which adjusts a frequency of the CO based on the differential error clocks to generate differential clocks at a second frequency, which is a multiple of the first frequency. A quadrature clock generator connected to the CO, which generates differential quadrature clocks at the second frequency from the differential clocks, where the differential feedback clocks are generated from the differential clocks and one pair of the differential quadrature clocks. A frequency doubler which doubles each pair of the differential quadrature clocks and outputs fully differential and balanced clocks at a third frequency for distribution, which is a multiple of the second frequency.

Abstract: A baseband processing unit includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta-sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

Abstract: An equalizer system includes at least one equalizer configured to equalize an input signal to generate an equalized input signal; a limiting amplifier coupled to the at least one equalizer, and configured to amplify the equalized input signal to a saturated level to generate an output signal; and a control circuit coupled to the at least one equalizer and the limiting amplifier, and configured to generate at least one control signal to the at least one equalizer according to the equalized input signal to adjust a peak gain of the at least one equalizer, wherein the peak gain of the at least one equalizer is at a Nyquist frequency.

Abstract: An equalizer circuit includes a first arithmetic circuit, a second arithmetic circuit, a data sampling circuit, and an edge sampling circuit. The first arithmetic circuit is configured to compensate an equalization sequence by secondary feedback sequences to output a first added sequence. The second arithmetic circuit is configured to compensate the first added sequence by a primary feedback sequence to output a second added sequence. The data sampling circuit samples, according to data clock, the second added sequence to output a primary sequence, and gains the primary sequence to output the primary feedback sequence. The data sampling circuit sequentially samples, according to the data clock, the primary sequence to output secondary sequences. The data sampling circuit gains the corresponding secondary sequences to output the secondary feedback sequences. The edge sampling circuit is configured to sequentially sample, according to an edge clock, the first added sequence to output an edge sequence.

Abstract: Certain aspects of the present disclosure relate to methods and apparatus relating to minimizing interference by controlling beam width of a wireless device. In certain aspects, a method of minimizing interference by controlling beam width of a wireless device, such as a user equipment (UE), includes configuring antenna elements of the UE to communicate in a serving cell using a first beam, monitoring a channel quality metric in the serving cell, and re-configuring the antenna elements of the UE to perform mobility measurements of one or more neighboring cells using a second beam broader than the first beam if the metric falls below a threshold value.

Abstract: A wireless communication device for transceiving signals by using carrier aggregation is provided. The wireless communication device includes a first antenna configured to transmit a first signal to an outside of the wireless communication device or receive a second signal from the outside; a first transmitter connected to the first antenna via a first node and configured to generate the first signal by combining plural transmitting carrier signals received over a plural transmitting carriers; and a first receiver connected to the first antenna via the first node and configured to divide the second signal into a plural receiving carrier signals received over a plural receiving carriers. The first receiver includes a first receiving amplifier commonly connected to a plural carrier receivers configured to amplify the second signal received from the first antenna and to divide the receiving carrier signals, respectively.

Abstract: A memory module includes a plurality of semiconductor memory devices associated with a same module board. The plurality of semiconductor memory devices configured to simultaneously perform a training operation, the plurality of semiconductor memory devices including a reception interface circuit configured to perform the training operation to search for selected equalization coefficients of an equalizer based on a training pattern from a memory controller, and transmit a training information signal to the memory controller in a training mode in response to a training command from the memory controller, the training information signal including the selected equalization coefficients.

Abstract: Otherwise incompatible crest factor reduction (CFR) and cable tilt compensation can be used together, such as in a cable television or other cable communication system having a frequency-dependent signal loss at higher frequencies. The CFR can be used to limit or reduce peaks of signals provided to a power amplifier, while additional tilt reference and tilt equalizer circuits are included to address deleterious peak regrowth effects that may otherwise arise by using conventional CFR together with cable tilt compensation.

Abstract: A receiver having analog-to-digital converters (ADC) is disclosed. The ADCs may be reconfigured based on the data rate of the receiver. For example, more portions of each time-interleaved ADC may be enabled to support a higher data rate of the receiver and less portions of the ADCs may be used to support a lower data rate of the receiver.

Abstract: A method and apparatus of a device that determines transmit and receive skew times between pairs of lanes of an electrical interface of a network element is described. In an exemplary embodiment, the device couple an optical loopback to transmit and receive interfaces of an optical interface, the optical loopback capable of transporting a first optical signal with a plurality of polarization and quadrature combinations. In addition, the device determines the receive skew time by transmitting a second optical signal on the optical loopback with one of the plurality of polarization and quadrature combinations. Furthermore, the device determines the transmit skew time by, tuning transmission delays on the transmit interface for a third optical signal with components corresponding to a pair of the plurality of polarization and quadrature combinations such that the third optical signal is recoverable on the receive interface.

Abstract: Described herein is a method and system of distributed acoustic sensing, such as in an urban or metropolitan area involving a dedicated and established fibre optic communications network including a data centre. In general, the disclosed method and system includes the steps of (a) selecting an optical fibre cable installation having a path extending across a selected geographical area, the optical fibre cable installation including a bundle of optical fibres and forming part of a fibre-optic communications network, (b) determining characteristics associated with the optical fibre and/or the selected optical fibre installation, (c) transmitting outgoing light in the optical fibre, (d) receiving reflected light back scattered along the optical fibre, and (e) based on the reflected light and the determined characteristics, generating an alert signal representative of an acoustic event. The disclosed method and system is thereby configured to detect acoustic events near or within the selected geographical area.

Abstract: According to aspects of the disclosure, a method is disclosed comprising: detecting a first hop to a first frequency in a hopping sequence, the first hop being performed by a transmitter in accordance with the hopping sequence; identifying a weighting vector that corresponds to a second frequency in the hopping sequence; obtaining an equalizer vector for the second frequency based on the weighting vector and an equalizer matrix, the equalizer matrix including a plurality of equalizer vectors, each equalizer vector corresponding to a different frequency in the hopping sequence; detecting a second hop from the first frequency to the second frequency, the second hop being performed by the transmitter in accordance with the hopping sequence; receiving a signal that is transmitted by the transmitter at the second frequency; and equalizing the signal by using the equalizer vector for the second frequency.

Abstract: A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.

Abstract: Methods and systems for crest factor reduction may comprise generating an original waveform, generating a distortion signal by reducing a crest factor of the original waveform, generating an error signal by subtracting out the original waveform from the distortion signal, and generating a conditioned waveform by adding the error signal to the original waveform. The crest factor of the original waveform may be reduced based on spectral mask requirements. The crest factor of the original waveform may be reduced using a limiter. The power amplifier may comprise a programmable gain amplifier (PGA). The distortion signal may be generated based on a PGA model and/or a predistortion model. A signal from an output of the PA may be fed back to the PGA model. The PGA model may be dynamically configured. The crest factor of the original waveform may be reduced in an analog domain and/or a digital domain.

Abstract: Embodiments of the present disclosure describe systems, devices, and methods that may provide channel estimation and compensation in high speed scenarios, which may include user equipment carried on a high speed train. Embodiments may employ cell-specific reference signal (CRS)-based time-domain channel estimation and compensation.

Abstract: The invention described herein is directed to different embodiments of a wireless communications device that can be used in many different applications, such as but not limited to a digital oversampling receiver adapted to select desired signals and to reject undesired signals. In one embodiment, a wireless communications device is disclosed that comprises an architecture for a receiver front end that obviates the need for high order passive circuitry or RC active circuitry to select desired signals and to reject undesired signals.

Abstract: A system and method for providing physical layer security in a low power wireless communication system utilizing an analog finite impulse response filter to produce an analog representation of the electronic fingerprint that uniquely identifies a transmitting device. A decision logic circuit produces a digital representation of the electronic fingerprint of the RF signal, and digital storage stores the digital fingerprints of trusted wireless nodes. A learning mode allows the storage of digital fingerprints of trusted nodes, and recognition mode permits the passage of the RF signal through a receive-permissive switch only if the digital fingerprint of a trusted wireless node is recognized. One of several triggering events may disable the receive-permissive switch including passage a specified period of time, loss of RF signal for a specified time, reduction in the strength of RF signal below a specified threshold, loss of electrical power, and other system or operator input.

Abstract: In certain embodiments, a method may include receiving one or more equalized samples of an input signal. The method may further include mitigating one or more excursions in the one or more equalized samples based on one or more current decisions of an iterative decoding process to generate compensated equalized samples. In addition, the method may include performing iterative decoding operations based on the compensated equalized samples, updating the current decisions of the iterative decoding process and outputting the current decisions as a converged result when the iterative decoding operations have converged for the compensated equalized samples.

Abstract: Audio systems and methods of suppressing residual echo are provided that determine spectral mismatches by comparing a spectral density of a residual signal from an acoustic echo canceler to a spectral density of a program content signal. At least one spectral mismatch is stored in memory. The systems and methods select a spectral mismatch to use for calculating a filter coefficient, from among one or more of the stored or actively determined spectral mismatches, and filter the residual signal based upon the calculated filter coefficient.

Abstract: A home system is provided. In a method of executing an application, information for executing the application is received from a device when accessing of the device is sensed, and the application is executed based on the received information. Accordingly, when a user merely brings a wireless guest device near to or in contact with an access point or a wired home device, it is possible to allow the wireless guest device to simultaneously automatically set an optimum security environment for a wireless network and execute an application that the user desires.

Abstract: A method and system for detecting whether a pressure line in a diesel exhaust fluid (DEF) delivery system has an obstruction. The system includes an electronic control unit with an electronic processor that is configured to receive an unfiltered pressure signal from a pressure sensor; to electronically filter the unfiltered pressure signal to determine a dosing pressure signal; to determine an integrated value based on the dosing pressure signal; and to determine whether the pressure line is obstructed by comparing the integrated value with a predetermined threshold.

Abstract: A nested mixed-radix DDSM can guarantee zero systematic frequency error when used as a divider controller in a fractional-N frequency synthesizer is described. This disclosure presents a nested cascaded mixed-radix DDSM architecture which can also guarantee zero systematic frequency error. In addition, the disclosure allows one to use higher order auxiliary modulators and shaped dither signal to eliminate feedthrough spurs completely. By increasing the number of levels in the cascade, the moduli of the individual modulator stages can be reduced, thereby increasing the speed of the synthesizer.

Abstract: A channel feedback information transmission method is disclosed. A terminal performs channel estimation on a subcarrier on which a downlink pilot is located, and obtains first channel information; the terminal performs a channel interpolation calculation on a channel of a data subcarrier according to the first channel information, and obtains second channel information according to a result of the channel interpolation calculation; the terminal determines a feedback factor; the terminal obtains third channel information from the second channel information according to the feedback factor, where an amount of the third channel information is less than an amount of the second channel information; and the terminal feeds back the third channel information to a base station. Some channel information is selected and fed back by means of a feedback factor.

Abstract: A digital filtering method includes receiving a digital signal, and passing the digital signal through a Pth order comb cascade. The method includes beginning pre-computing of intermediate integrator states of a Pth order integrator cascade as a function of the digital signal, prior to receiving output from a last comb of the Pth order comb cascade. The outputs from each comb of the Pth order comb cascade are then applied to the pre-computed intermediate integrator states to thereby produce a filtered version of the digital signal. The Pth order comb cascade may operate at a sampling frequency, and the pre-computing of the intermediate integrator states is performed at the sampling frequency, while the application of the outputs from each comb of the Pth order comb cascade to the pre-computed intermediate integrator states is performed at a multiple of the sampling frequency.

Abstract: A wireless transmitter for transmitting bits to a wireless receiver. The wireless transmitter comprises: (i) circuitry for generating binary data bits; and (ii) circuitry for providing a first spreading sequence for a first bit in the binary data bits and for providing a second spreading sequence for a second bit in the binary data bits, wherein the second bit is complementary to the first bit. Each spreading sequence consists of an integer number N of bits, and the circuitry for providing provides a same bit value in an integer number M of bit positions in the first and second spreading sequences, where M<N.

Abstract: The present invention is directed to a method, an apparatus and a system for error-free detection of bit values which are transmitted using a continuous data signal. For this purpose, a particularly advantageous metric is proposed, which makes a conclusion possible as to an optimum time for sampling the data signal and thus makes it possible to detect the bit value unambiguously.

Abstract: An initial phase of each output signal generated by a plurality of radio frequency (RF) front-end circuits is determined by mixing an input signal with a mixing signal in a mixer of the corresponding RF front-end circuit. To that end, a time difference for each of the plurality of RF front-end circuits is determined by measuring a time difference between a reference signal (common to all of the RF front-end circuits) and the mixing signal of each RF front-end circuit. The initial phase for each output signal is then determined based on the measured time difference for the corresponding RF front-end circuit. Determining the initial phase in this manner accounts for any uncertainty of the phase when the RF front-end circuits are activated, enabling the phase of the corresponding antenna element to be accurately controlled.

Abstract: An array-based Compressed sensing Receiver Architecture (ACRA) includes an antenna array with two or more antennas connected to two or more ADCs that are clocked at two or more different sampling rates below the Nyquist rate of the incident signals. Comparison of the individual aliased outputs of the ADCs allows for estimation of signal component characteristics, including signal bandwidth, center frequency, and direction-of-arrival (DoA). Multiple digital signal processing (DSP) techniques, such as sparse fast Fourier transform (sFFT), can be employed depending on the type of detection or estimation.

Abstract: A device and method for reducing intermodulation within a radio receiver. The device includes an intermodulation filter. The intermodulation filter is configured to receive a signal, apply a first filter and a second filter to the signal to generate a first and a second filtered signal. The intermodulation filter is configured to isolate a first intermodulation component located on a first side of a frequency spectrum of the signal within the second filtered signal, determine an estimated second intermodulation component based on a potential frequency band location, determine a correction factor based on an amplitude and phase relationship between the first and second intermodulation components, apply the correction factor to the estimated second intermodulation component, determine if the second intermodulation component exceeds a predetermined power threshold, and apply the adjusted estimated second intermodulation component to the first filtered signal, suppressing the second intermodulation component.

Abstract: When a terminal aggregates three downlink carriers by using the carrier aggregation (CA) of the LTE-A technology and transmits an uplink signal on two uplink carriers while aggregating at least two uplink carriers, a harmonic component and an intermodulation distortion (IMD) component are generated, thereby influencing a downlink band of the terminal itself. Therefore, the present specification presents a scheme therefor.

Abstract: There is discloses a method of frequency correction during data transmission in a low-power wide-area network (LPWAN). The method is executable by a computing device coupled to the LPWAN. The method comprises: determining an actual frequency of the received message as a mid-point of a given spectrum section, based on the given spectrum section meeting a condition of: the message was successfully received in the given spectrum section, the signal quality metric has a maximum value in the given spectrum section in comparison with all other spectrum sections where that message was also received; calculating an expected frequency of the radio signal based on data contained in the message; determining a received radio signal frequency error as a difference between the actual frequency and the expected frequency of the signal; generating a message send frequency based on the received radio signal frequency error.

Abstract: A multi-carrier cellular wireless network (400) employs base stations (404) that transmit two different groups of pilot subcarriers: (1) cell-specific pilot subcarriers, which are used by a receiver to extract information unique to each individual cell (402), and (2) common pilots subcarriers, which are designed to possess a set of characteristics common to all the base stations (404) of the system. The design criteria and transmission formats of the cell-specific and common pilot subcarriers are specified to enable a receiver to perform different system functions. The methods and processes can be extended to other systems, such as those with multiple antennas in an individual sector and those where some subcarriers bear common network/system information.

Abstract: A digital broadcast system including a broadcast receiving system and data processing method are disclosed. In the broadcast receiving system receiving broadcast signals, the broadcast receiving system includes a transmission parameter decoding unit, a known sequence detector, and a burst controller. The transmission parameter decoding unit detects information on a burst of a received signal from broadcast data having main service data and mobile service data multiplexed therein within a field of the received signal and outputs the detected information on the burst. The known sequence detector receives burst information from the transmission parameter decoding unit and uses the received burst information and known data position information included in the received data, so as to output burst control information. The burst controller uses the burst control information to control power supply of the broadcast receiving system.