There are provided an orthogonal frequency division multiplexing (OFDM) demodulator, a demodulation method and a receiver. The OFDM demodulator includes a phase analog-to-digital converter and a determiner, wherein the phase analog-to-digital converter is configured to acquire an OFDM analog signal, extract and quantize phase information of a modulated signal on each subcarrier in the OFDM analog signal, and output a phase quantified value corresponding to the phase information of the each subcarrier; and the determiner is configured to perform determination according to the phase quantified value, to obtain modulation information corresponding to the each subcarrier.

A satellite system uses cloud computing virtualized gateways, radio transport protocol and on-ground beamforming to improve wireless communication. A digitized ground based subsystem for use with the satellite system can be employed in transmitting an optical feeder uplink beam to a communications platform that includes a multiple element antenna array. The ground based subsystem is configured to receive the optical feeder uplink beam and, in dependence thereon, use the multiple element antenna feed array to produce and transmit a plurality of RF service downlink beams to a single or plurality of service terminals.

The disclosed systems, structures, and methods are directed to a wireless receiver. The configurations presented herein employ a signal encoder configured to encode a plurality of received analog signals into a single encoded analog composite signal, in accordance with a variable leading bit orthogonal coding scheme, an analog-to-digital converter (ADC) configured to convert the single encoded analog composite signal into a single encoded digital composite signal containing constituent digital signals, a synchronization module configured to provide the variable leading bit orthogonal coding scheme to the signal encoder, and a signal decoder configured to decode the single encoded digital composite signal in accordance with the variable leading bit orthogonal coding scheme, to output a plurality of digital signals containing the desired information content of the received plurality of analog signals.

The described technology is generally directed towards adapting the demodulation reference signal sent in a wireless resource data block based on channel estimation performance. In general, if the demodulation reference signal received was not successfully able to be used to demodulate the resource data block, the demodulation reference signal density can be increased up to a maximum density, which costs resource elements but improves the channel estimation accuracy. If the demodulation reference signal received was able to be used to demodulate the resource data block, the demodulation reference signal density can be decreased down to minimum density, which saves resource elements for data. The network device can use HARQ ACK/NACK data (e.g., a current count or counted over a time period) to determine channel estimation performance, and/or the user equipment can recommend a demodulation reference signal density change.

Different solutions for an apparatus comprising a predictor predicting decodability of received symbols are disclosed. Decoding is performed based on the prediction.

This application relates to determining transmission quality of a communication channel, in particular for determining a measure of errors in data transmitted as multi-bit symbols. Described is an error checker with an input for receiving an input signal comprising a series of modulated symbols, wherein each symbol encodes multiple bits of a pseudo-random bit sequence. A demodulator is configured to receive the input signal and only partially demodulate at least some of the symbols to generate a partially demodulated bit sequence. A PRBS module is configured to receive the partially demodulated bit sequence and determine the pseudo-random bit sequence and a comparator compares the output of the demodulator to an expected output based on the pseudo-random bit sequence determined by the PRBS module.

The present invention provides an apparatus of transmitting broadcast signals, the apparatus including, an encoder for encoding service data, a frame builder for building at least one signal frame by mapping the encoded service data, a modulator for modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and a transmitter for transmitting the broadcast signals having the modulated data.

The present invention relates to single carrier modulation schemes, and presents a transmitter device, a receiver device and a transceiver device for a single carrier modulation scheme. The transmitter device is configured to generate a plurality of signature roots for a single carrier transmission, construct a Lagrange matrix and a Vandermonde matrix based on the plurality of signature roots, and generate a single carrier modulated signal based on the Lagrange and the Vandermonde matrix. The receiver device is configured to determine a plurality of signature roots, construct at least two Vandermonde matrices from the plurality of signature roots, and perform a demodulation of a single carrier modulated signal based on the at least two Vandermonde matrices. The transceiver device comprising a transmitter device configured to generate a single carrier modulated signal, and a receiver device configured to perform a demodulation of the single carrier modulated signal.

The present specification relates to a reception apparatus and method for demodulating a signal in a wireless AV system. The reception apparatus estimates a transmission signal on the basis of an MMSE weight matrix. The reception apparatus divides the estimated transmission signal for respective reception antennas and performs an IFFT. The reception apparatus estimates and compensates for phase noise for the respective reception antennas on the basis of the signal for which the IFFT has been performed. The reception apparatus demodulates the estimated and compensated signal for respective streams.

The method for transmitting, by a user equipment, a sidelink signal in a wireless communication system is a sidelink signal transmission method comprising: transmitting sidelink control information (SCI); mapping, to a plurality of sub-carriers, at least one complex-valued modulation symbol, which is related to a sidelink data signal, and a preset value; generating the sidelink data signal by modulating the at least one complex-valued modulation symbol and the preset value by orthogonal frequency division multiplexing (OFDM); and transmitting the sidelink data signal on the basis of the SCI, wherein the SCI comprises information regarding a sub-carrier set including at least one sub-carrier, to which the preset value is mapped, from among the plurality of sub-carriers, and at least one of the location and number in a frequency domain of the at least one sub-carrier, to which the preset value is mapped, is different for each sub-carrier set.