A satisfactory list detection (LD) receiver based on spatial modulation (SM) orthogonal frequency division multiplexing (OFDM) waveform is provided. In some embodiments, the LD receiver can implement a suboptimal LD detection process that relies on a reduced search space an optimal joint ML detection-based process for the SM-OFDM transmission mode. In some aspects, the overall search space for the optimal joint ML is determined by the total spectral efficiency, which can be divided into two information categories with two different search spaces defined by the number of bits of each category. As such, in some aspects, the LD receiver can permit detecting, with reduced complexity, antenna bits and data bits based on a determination of respective log-likelihood ratios.

Methods and systems for providing and processing data are disclosed. An example method can comprise determining a first weighted probability based on a probability of occurrence of a noise signal and a first likelihood ratio. The first likelihood ratio is based on a frequency distribution of the noise signal. An example method can comprise determining a second weighted probability based on a probability of non-occurrence of the noise signal and a second likelihood ratio. An example method can comprise determining a combination of the first weighted probability and the second weighted probability, and providing the combination to a decoder configured to decode a value based on the combination.

The peak level of a high frequency analog signal in an RF receiver is detected by a system which samples the signal and compares it against a static threshold, generating an above/below status. The system is implemented with a sampler of sufficient aperture bandwidth to capture the signal in question, operated at a clock frequency, dynamically chosen as a function of f.sub.LO (local oscillator frequency) and the desired f.sub.IF (intermediate frequency), to minimize in-band intermodulation products. The sampler produces kickback intermodulation products that are positioned out-of-band, or are of low enough power in-band so as to be inconsequential. Samples are taken for a statistically significant period of time, and the status is used to adapt the threshold to systematically determine the peak amplitude of the signal being observed.

A method to process applicable to coherent optical channels with either linear or nonlinear phase noise includes: splitting a received sequence of data into clusters of points according to a cumulative log-likelihood function from constellation obtained in a previous iteration; generating new constellation points by calculating a center of mass of the clusters of points; repeating until convergence or until a predetermined number of iterations has been reached to determine a signal constellation; and transmitting signals over the coherent optical channels with nonlinear phase noise using the disclosed signal constellation and LDPC-coded modulation concepts.

An apparatus for processing a received radio signal includes at least one processor and at least one memory. The at least one memory storing computer program code. The at least one memory and the computer program code being configured to, with the at least one processor, cause the apparatus to at least in part perform processing (received radio signal data with first and second signal processing chains, which respectively include first and second processing modules configured to respectively determine first output and an estimation of the first output data, and determine second output data using a neural network based on the estimation; updating parameters of the neural network based on the first output data and the second output data; and after the updating, processing the received radio signal data with the second signal processing chain, without applying the first processing module.

A receiving device comprises a signal detection unit, a reliability unit coupled to the signal detection unit and a decoding unit coupled to the signal detection unit and the reliability unit. The signal detection unit is for receiving a plurality of compensated symbols on a plurality of subcarriers, to generate a plurality of soft information and a plurality demodulated symbols of the plurality of compensated symbols according to the plurality of compensated symbols. The reliability unit is for generating a plurality of weights of the plurality of soft information according to a plurality of reliability information of the plurality of subcarriers. The decoding unit is for decoding the plurality of demodulated symbols according to the plurality of soft information and the plurality of weights, to generate a plurality of decoded bits.

An apparatus and a method. The apparatus includes a channel estimation (CE) module, including a first input for receiving pilot resource element (RE) observations, a second input for receiving data RE observations, a third input for receiving log-likelihood ratios (LLRs), and an output; a detector, including a first input connected to the output of the CE module, a second input for receiving data RE observations, and an output connected to the third input of the CE module; and a decoder, including an input connected to the third input of the CE module, and an output.

There is disclosed a method of operating a receiving radio node in a wireless communication network. The method includes receiving first signaling, the first signaling covering at least one allocation unit carrying Demodulation Reference Signaling, DMRS. Receiving includes performing Inter Carrier Interference, ICI, suppression for the at least one allocation unit carrying DMRS based on received DMRS. The disclosure also pertains to related devices and methods.

Embodiments of a device and method are disclosed. In an embodiment, a method of wireless communications involves at a receiver, receiving a first packet, subsequently, at the receiver, receiving a second packet, and determining whether the second packet is a repetition of the first packet based on wireless communications channel estimation information associated with the first and second packets.

A spectrally efficient multi-carrier communication apparatus with advanced features of carrier management. The apparatus is flexible to changes in the form of the sub-carrier and their location in frequency. This invention can use non-standard pulses at arbitrary frequencies providing a greater control of the carrier. The additional features can be used for spectral efficiency, to correct signal distortion or for privacy. Also disclosed is a novel multiplexing method that saves spectrum called Spectral Shape Division Multiplexing (SSDM), preferred embodiments of the transmitter and receiver. Two complementary algorithms help the invention excel among other existent methods. The disclosed algorithms can similarly be adapted to other systems. A correction method for spectrally efficiency is calibrated to all desired noise levels for maximum benefit. An iterative multi-carrier reduction method dramatically reduces the error on overlapped subcarriers.