Systems and methods are described herein for communications bandwidth enhancement using Orthogonal Spatial Division Multiplexing (OSDM). For example, large sparse antenna arrays may be able to distinguish between signals emitted by multiple nearly collocated antennas, even if the signals have the same frequency, polarization, and coverage. Thus, the use of a large sparse antenna array may be able to resolve/isolate individual antennas on a single platform, allowing for OSDM, analogous to Orthogonal Frequency Divisional Multiplexing (OFDM). Using OSDM, multiple antennas on the same vehicle are able to reuse the same frequencies/polarizations without interference, thereby increasing spectrum availability while still providing the same transmitter power spectral density and total RF power emission.

Methods and devices are disclosed for encoding and transmitting data sequences for low data rate applications. An encoded data sequence is transformed and used to shape a multi-carrier pulse to create a narrow-band signal for transmission. Time domain tails of the narrow-band signal may be removed to decrease overhead. The data may be first encoded to create a sparse modulated data sequence. Multi-carrier pulse shaping may be carried out using frequency division multiplexing (FDM) or filter bank multi-carrier (FBMC) techniques. Alternatively, single carrier pulse shaping may be used to create the narrow-band signal.

The present invention is designed so that uplink control signals can be transmitted adequately even when the number of component carriers that can be configured in a user terminal is expanded. A user terminal can communicate by using six or more component carriers, and has a receive receiving section that receives a DL signal, a transmission section that transmits a UL control signal, which includes a delivery acknowledgement signal in response to the DL signal, and a control section that controls a format to apply to the UL control signal, and the control section applies a format, having large capacity in comparison to a PUCCH format of an existing system in which the number of component carriers to be configured is five or less, to the UL control signal.

The present disclosure provides a transmitter and a corresponding method. The method includes: pre-processing a signal to be transmitter, the signals being across a plurality of sub-bands; filtering the signal to generate a universal-filtered orthogonal frequency division multiplexing (UF-OFDM) signal, where two or more sub-bands of the plurality of sub-bands are filtered by a common filter; and transmitting the generated UF-OFDM signal.

A multi-cell coordination system and method are provided in the disclosure. The multi-cell coordination system includes a plurality of Radio Frequency Nodes (RFNs) and a Baseband Processing Node (BPN). Each of the RFNs includes a baseband circuit, a radio frequency (RF) circuit, and a plurality of transmission ports. The RF circuit is electrically connected to the baseband circuit and to one or more antennas. The transmission ports of each RFN are configured to transmit data to the other RFNs and to receive data provided by the other RFNs. The BPN centralizes and performs layer 2 and layer 3 functions of each cell.

A method for managing beam squint in a phased antenna array system operating at millimeter wavelengths using carrier aggregation includes determining a minimum array gain threshold, determining an upper bound for a fractional bandwidth for a fixed number of antennas, and constructing a codebook with a predetermined coverage range based on at least one of an angle of arrival or an angle of departure and further based on the upper bound. The method further includes performing carrier aggregation for the fixed number of antennas and selecting at least two antennas based on the codebook.

A method for processing wireless signals and a wireless device are disclosed. The method for processing wireless signals is applied to the wireless device that includes an amplifier circuit amplifying wireless signals according to a base gain. The method for processing wireless signals includes steps of: setting the base gain as a first gain value in a first operation period; performing multiple packet detections in the first operation period and counting a total number of false alarms; determining a second gain value according to the total number of false alarms; and setting the base gain as a second gain value in a second operation period that is later than the first operation period.

Aspects of the disclosure relate to a new radio (NR) single symbol design in which reference signals and data tones are frequency division multiplexed (FDM). In a particular aspect of the disclosure, a different encoding sequence is assigned to each possible value of an information element (IE) such that a minimum distance between encoding sequences corresponding to any pair of possible values is maximized. A symbol corresponding to a particular value of the IE is then transmitted. Here, the symbol is configured according to a sequence selected from a set of sequences corresponding to the particular value of the IE, such that the symbol comprises a plurality of reference signals FDM with a plurality of FDM resource elements.

A user terminal configured to communicate with a radio base station includes a processor that configures a number of resource blocks used in a format for an uplink control signal; and a transmitter that transmits to the radio base station the uplink control signal using the format comprising the configured number of resource blocks.

This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, for managing high volumes of space-time-streams in Wi-Fi systems. An access point (AP) may transmit packets including long training field (LTF) sections using a number of space-time-streams greater than eight. Mobile stations (STAs) in the system may or may not be capable of processing this number of streams. The AP may modulate an LTF section using a matrix with dimensions smaller than the number of streams by using tone-interleaving or by performing modulation with separate matrices in time and frequency. In some other implementations, the AP may split the antennas for transmission into groups, each group transmitting either different packets in a subset of streams or a same packet in a subset of tones. In further implementations, the AP may combine multiple space-time-streams into a super stream that supports reception at different types of STAs.