The present invention relates to a method and apparatus for demodulation in a wireless communications system transmitted across a wireless communications channel. The described wireless receiver includes a first antenna for receiving a wireless signal including a symbol transmitted across a wireless communications channel perceived by the first antenna, an observation modifier for generating a modified observation (y) of the symbol based on a product of the received observation (r) and the complex conjugate of a channel estimate (h*), a log-likelihood ratio (LLR) module generating log-likelihood ratios (LLRs) based on the modified observation and the channel estimate, and a maximum-likelihood-based decoder for decoding the symbol based on the LLRs.

The proposed solution relates to a method and an apparatus in a communication system. The solution includes receiving as an input a frame including of a set of data symbols and reference symbols, each data symbol forming a rectangular symbol constellation of samples, derotating the first symbol of the set on the basis of the reference symbols, and setting phase rotating angle of the first symbol as zero. The solution further includes for each following successive symbol in the set of symbols: performing equalization; reducing the number of samples in the constellation by selecting samples in two or more corners of the constellation by utilising two or more threshold values; estimating the phase rotating angle of the symbol from the reduced number of samples and derotating the symbol on the basis of the determined phase rotating angle.

A semiconductor device of an embodiment includes first and second couplers, an encoding circuit, and a demodulating circuit. The encoding circuit executes differential Manchester encoding on digital data based on a clock inputted thereto via the first coupler and outputs an encoded data. The demodulating circuit includes a first sampling circuit which samples the encoded data inputted via the second coupler based on a sampling frequency set to be two times higher than that of the encoded data and which outputs first sample data, a second sampling circuit which samples the encoded data at a timing earlier than that in the first sampling circuit and which outputs second sample data, a determination circuit which determines whether or not the first and the second sample data match each other, and a selection circuit which selects first phase data or second phase data from the first sample data.

A method and apparatus are provided. The method includes receiving, by a user equipment (UE), a phase shift keying (PSK) modulated signal from a transceiver, derotating the PSK modulated signal, and equalizing the PSK modulated signal using a maximum likelihood sequence estimator (MLSE) based on a first main tap gain (MTG) look up table (LUT) and a first inter-symbol interference (ISI) LUT corresponding to even time samples and a second MTG LUT and a second ISI LUT corresponding to odd time samples.

A method and apparatus are provided. The method includes receiving, by a user equipment (UE), a phase shift keying (PSK) modulated signal from a transceiver, derotating the PSK modulated signal, and equalizing the PSK modulated signal using a maximum likelihood sequence estimator (MLSE) based on a first main tap gain (MTG) look up table (LUT) and a first inter-symbol interference (ISI) LUT corresponding to even time samples and a second MTG LUT and a second ISI LUT corresponding to odd time samples.

A method for transmitting a frame is provided by a device in a wireless communication network. The device compensates a carrier frequency using a value of carrier frequency offset (CFO), and transmits a frame with the compensated carrier frequency to a receiver. The value of the CFO is indicated in TXVECTOR. A method for transmitting a frame is provided by a device in a wireless communication network. The device allocates data tones for a last symbol based on a payload size, generates the last symbol having repeated waveforms and transmits a frame including at least one period waveform of the repeated waveforms in the last symbol.

An example device in accordance with an aspect of the present disclosure includes a non-linear compensator, an interpolator, a demultiplexer, and a demodulator. The non-linear compensator is to correct a non-linearity of the input bitstream data to obtain linearized bitstream data. The interpolator is to convert a non-constant sample rate of the linearized bitstream data to obtain constant sample rate bitstream data. The demultiplexer is to demultiplex the constant sample rate bitstream data into a first waveform and a second waveform. The demodulator is to demodulate the first waveform and the second waveform.

In one example, an apparatus includes an offset tunable edge slicer having an input to receive a pulse amplitude modulation signal. The offset tunable edge slicer also has a plurality of possible offset settings corresponding to a plurality of different reference voltages of the offset tunable edge slicer. A multiplexer has an output coupled to the input of the offset tunable edge slicer and an input to receive a control signal that selects one of the plurality of possible offset settings for the offset tunable edge slicer. A phase detector has an input coupled to an output of the offset tunable edge slicer.

An example device in accordance with an aspect of the present disclosure includes a non-linear compensator, an interpolator, a demultiplexer, and a demodulator. The non-linear compensator is to correct a non-linearity of the input bitstream data to obtain linearized bitstream data. The interpolator is to convert a non-constant sample rate of the linearized bitstream data to obtain constant sample rate bitstream data. The demultiplexer is to demultiplex the constant sample rate bitstream data into a first waveform and a second waveform. The demodulator is to demodulate the first waveform and the second waveform.

A numerical control device wherein a sinusoidal signal generated by a sine wave generation part is input by a control loop excitation part to a control loop of the control object, the input signal input to the control loop and the output signal from the control object are sampled by the data acquisition part periodically, and the sampling data is used by the frequency characteristic calculation part to calculate the frequency characteristic of the control loop to control the control object, wherein the frequency characteristic calculation part uses data obtained by inputting a sinusoidal signal obtained by shifting an initial phase of the sinusoidal signal by a phase shift part provided at a sine wave generation part by exactly a certain amount to the control loop a plurality of times to calculate the frequency characteristic of the control loop to thereby improve the measurement precision regardless of the sampling frequency.