Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as long term evolution (LTE). Methods and systems for optimizing computation of log-likelihood ratio (LLR) for decoding modulated symbols. A method disclosed herein involves receiving at least one symbol transmitted from at least one device, wherein the received at least one symbol is encoded and modulated symbol including a plurality of data bits. The method further includes computing a log-likelihood ratio (LLR) of each bit in the received at least one symbol for decoding the received at least one symbol using a centroid method that involves exploiting a symmetry of a constellation of code words and/or a uncertainty region defined on a constellation of code words.

Abstract: A method of operating a radio unit, RU, in a network node of a wireless communication system, the network node having a lower-layer split architecture and including a lower-layer split central unit, LLS-CU, includes receiving an uplink signal from a user equipment, UE, in response to the uplink signal, determining at the RU a set of beamforming weights defining an antenna beam from the RU to the UE, transmitting the uplink signal to the LLS-CU, and forming the antenna beam to the UE using the set of beamforming weights.

Abstract: A method includes determining, based at least in part on parameters of a software-defined radio (SDR), waveform data descriptive of an electromagnetic waveform. The method also includes generating feature data based on the waveform data and based on one or more symbols decoded from the electromagnetic waveform. The method further includes providing the feature data as input to a first machine-learning model and initiating a response action based on an output of the first machine-learning model.

Abstract: A receiver for a passive optical network is provided. The receiver includes an analog-to-digital converter circuitry configured generate a digital receive signal based on an analog receive signal. The analog receive signal is based on an optical receive signal encoded with a binary transmit sequence. The receiver additionally comprises linear equalizer circuitry configured to generate an equalized receive signal by linearly equalizing the digital receive signal. Further, the receiver comprises secondary equalizer circuitry configured to generate soft information indicating a respective reliability of elements in the equalized receive signal using the Viterbi algorithm. In addition, the receiver comprises decoder circuitry configured to generate a digital output signal based on the soft information using soft decision forward error correction.

Abstract: An Advanced Antenna System (AAS) receiver and related methods are provided. According to one aspect an AAS receiver comprises a digital processing block of a Radio Frequency Integrated Circuit (RFIC). The digital processing block comprises an interface for communicating with a Central Unit (CU), and a plurality of Antenna Signal Processing Blocks (ASPBs), each receiving a digitized receive signal from a respective antenna element of an antenna array. Each ASPB comprises one or more receivers, each of which receives and processes the signal from the respective antenna element. Some receivers within the ASPB beamform the respective processed signal to produce one or more data streams to be sent to the CU. Other receivers within the ASPB provide the respective processed signal to a processing block that buffers the processed signal and sends it to the CU at a later time, e.g., when traffic to the CU is relatively lower.

Abstract: A method implemented by a first device operating in a communication system includes obtaining a channel representation of a set of channels between the first device and a second device, the set of channels being over a set of subcarriers, the first device having multiple antenna ports, and the second device having one or multiple antenna ports; determining, by the first device, one or multiple communication filters in accordance with at least the channel representation; and applying, by the first device, the one or multiple communication filters to a communication on at least one of the multiple antenna ports of the first device, the communication being over the set of subcarriers.

Abstract: Network throughput can be increased and the message failure rate can be reduced in 5G and 6G communications by use of AI-based fault mitigation: that ism detection, localization, and correction of faulted message elements in real-time. A receiver provides the demodulated message, along with amplitude and phase measurements of each message element, directly to a properly trained artificial intelligence model. The model determines the most-likely faulted message elements, and in some cases can indicate the most probable correct value of the faulted message elements. The AI model can also determine the fault probability of each message element. The expected message content (such as value ranges and predetermined format) can also be provided to the AI model, for further corruption sensitivity. By correcting faulted messages in less time than required for a retransmission, the system can save time, reduce backgrounds, and greatly reduce dropped messages.

Abstract: An air to ground (ATG) communication system testing platform may be configured to operably couple a base station to an aircraft base radio in a lab environment. The testing platform may include a position simulator and a channel simulator. The position simulator may be configured to generate simulated aircraft position information and communicate the simulated aircraft position information to an aircraft base radio and a base band unit of the base station. The channel simulator may operably couple a remote radio head of the base station to the aircraft base radio, and may be configured to emulate channel conditions with respect to transmission of signaling generated by the remote radio head for communication to the aircraft base radio based on the emulated channel conditions.

Abstract: Methods and systems are described for generating two comparator outputs by comparing a received signal to a first threshold and a second threshold according to a sampling clock, the first and second thresholds determined by an estimated amount of inter-symbol interference on a multi-wire bus, selecting one of the two comparator outputs as a data decision, the selection based on at least one prior data decision, and selecting one of the two comparator outputs as a phase-error decision, the phase error decision selected in response to identification of a predetermined data decision pattern.

Abstract: A system includes a control apparatus and a plurality of access points (APs), with the control apparatus causing the access point apparatus to identify a received signal strength at a station (STA) of signals transmitted from the plurality of Aps, and determine communication parameters for the plurality of APs to communicate with the STA by using joint beamforming (JB). After the received signal strength at the STA of a signal transmitted from a first AP and the received signal strength at the STA of a signal transmitted from a second AP are identified, whether to use JB for communication between the first AP and the second AP and the STA is determined based on a strength difference between the two received signal strengths.

Abstract: A 5G/6G network can include a modulation scheme for uplink and downlink messaging using a special zero-power modulation level, in addition to the regular amplitude modulation levels of, for example, QAM. The receiver can demodulate each message element by comparing the amplitude to the various amplitude levels, including the zero-power level, and thereby increase the bits per message element, and hence the communication throughput, at no increase in transmitted power. In addition, the zero-power states can reveal intrusive noise and interference in the proximate message, enabling correction before the demodulation. The zero-power amplitude may be added to conventional modulation schemes, such as an additional zero-power amplitude level in QAM, PSK, and amplitude-phase modulation schemes, thereby providing greater versatility at little or no cost and no additional transmission power.

Abstract: A radio communication apparatus includes a plurality of antennas, a radio transmission unit configured to execute radio transmission processing on data to be transmitted from the plurality of antennas, and a processor connected to the radio transmission unit. The processor executes a process including acquiring beam group specification information that specifies a beam group that is capable of being formed when the data to be transmitted is transmitted, forming at least one beam included in the beam group, and correcting an envelope of a beam group using correction factors, the beam group including the at least one beam formed, the correction factors corresponding to the beam group specification information.

Abstract: There is provided mechanisms for beamformed transmission using a precoder. A method is performed by a radio transceiver device. The radio transceiver device comprises hardware. The hardware impacts transmission of signals from the radio transceiver device. The method comprises acquiring channel conditions of a radio propagation channel between the radio transceiver device and at least one other radio transceiver device. The method comprises determining a precoder, in form of a linear precoding matrix, for beamformed transmission towards the at least one other radio transceiver device. The precoder is determined according to the channel conditions and a model of how the hardware impacts the transmission of signals from the radio transceiver device. The method comprises transmitting, using the precoder, a signal towards the at least one other radio transceiver device.

Abstract: A ringing suppression circuit according to an embodiment includes a terminator, a switching element configured to connect the terminator between first and second bus lines, and a control signal generation circuit configured to accept a reception result of a signal from a reception circuit that receives the signal transmitted through the first and second bus lines, and generate a control signal for controlling the switching element on a basis of the reception result.

Abstract: Proposed is a mobile router for transmitting and receiving millimeter waves to and from a base station, the mobile router including a first member including an antenna array configured to transmit and receive the millimeter waves, a second member, and an angle adjustment part connecting the first member to the second member, wherein the angle adjustment part is formed such that the first member and the second member are adjusted at a predetermined angle so as to allow the antenna array to transmit and receive the millimeter waves at a specific angle. The first member including the antenna array is configured to be unfolded at a predetermined angle with respect to the second member in order to transmit and receive a 5G millimeter wave beam signal at a specific angle, and thus a user can optimally adjust the transmission/reception sensitivity of 5G millimeter waves.

Abstract: There are provided mechanisms for generating a beam set. A method is performed by a radio transceiver device. The method comprises generating the beam set as combination of at least two beam pairs. Each beam pair is formed by two respective beams with orthogonal polarizations. The two beams have their pointing directions separated by a first angular separation delta1>0. Neighbouring beam pairs have their pointing directions separated by a second angular separation delta2>0. The first angular separation delta1 is a function of the second angular separation delta2.

Abstract: A multi-channel multi-phase digital beamforming method and apparatus is provided. The multi-channel multi-phase digital beamforming method includes following steps: S1: pre-configuring a delay filtering coefficient storage table; S2: calculating a filter coefficient and a weighting coefficient; and S3: performing weighted synthesis and filtering processing on a multi-phase signal to form a multi-phase digital beam. When a data rate of an input signal changes, the multi-channel multi-phase digital beamforming method can perform weighted synthesis for the signal at different sampling rates by changing a quantity of signal phases without changing a processing architecture. Based on a multi-phase finite impulse response (FIR) filtering technology, a fractional multiple delay processing architecture that can flexibly adapt to a plurality of phase quantities of the input signal is proposed.

Abstract: Systems and methods for beamforming of broadcast and synchronization channels are provided. In one example, a system includes a BBU, RU(s) communicatively coupled to the BBU, and antennas communicatively coupled to the RU(s). Each RU is communicatively coupled to a respective subset of antennas. The BBU, RU(s), and antennas implement a base station for wirelessly communicating with UEs. The base station is configured to map a synchronization signal to the antennas during a sequence of time periods, transmit the synchronization signal via each respective subset of antennas with a first antenna beam pattern during a first time period of the sequence of time periods, and transmit the synchronization signal via each respective subset of the antennas with a second antenna beam pattern during a second time period of the sequence of time periods. The first antenna beam pattern is different than the second antenna beam pattern.

Abstract: A decoding unit decodes data corresponding to an N×M array of quantized coefficients from a bit stream. An inverse quantization unit derives orthogonal transform coefficients from the N×M array of quantized coefficients by using at least a quantization matrix. An inverse orthogonal transform unit performs inverse orthogonal transform on the orthogonal transform coefficients generated by the inverse quantization unit to generate prediction residuals corresponding to a block of a P×Q array of pixels. An inverse quantization unit derives the orthogonal transform coefficients by using at least a quantization matrix of an N×M array of elements, and the inverse orthogonal transform unit generates prediction residuals for the P×Q array of pixels having a size larger than the N×M array.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a first throughput on a first beam of the UE, wherein the first beam is associated with a first number of antenna elements. The UE may identify an estimated maximum throughput of the UE. The UE may communicate, based at least in part on the first throughput being greater than the estimated maximum throughput, using a second beam, the second beam having a second throughput that is greater than the estimated maximum throughput, and the second beam being associated with a second number of antenna elements lesser than the first number of antenna elements. Numerous other aspects are described.