Embodiments of this application provide a signal sending method, including: determining a first subcarrier, wherein an offset is between the first subcarrier and a center subcarrier of target resource blocks in a target bandwidth, and the offset is related to a subcarrier spacing; and determining a signal, wherein a location of the first subcarrier is the same as a carrier frequency location of the signal.

According to one embodiment, a wireless communication device includes a transmitter configured to transmit a first frame including first information required for uplink multi-user transmission without receiving a transmission request for the first information; and a receiver configured to receive a second frame.

A signal sending method, a signal receiving method, and a device for signal transmission or receiving are provided. A part that is of a first signal and that is carried on a k.sup.th subcarrier in an i.sup.th subcarrier group in N subcarrier groups is x.sub.i,n.sub.id(k), and a sequence {s.sub.i,n.sub.id(k)} related to x.sub.i,n.sub.id(k) is one of enumerated sequences. The enumerated sequences are sequences with relatively good cross-correlation. Therefore, for two subcarrier groups, provided that selected {s.sub.i,n.sub.id(k)} is two of the enumerated sequences, cross-correlation between signals carried in the two subcarrier groups can be ensured to be relatively good, thereby reducing interference between the signals and improving channel estimation performance.

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.

Forward error correction encoding is applied to a first stream of input bits associated with a first data layer to generate a first stream of coded bits. The first steam of coded bits is mapped to K1 binary streams. A first layer-specific set of stream-specific modulators are applied to the K1 binary streams to generate K1 independent complex-valued symbol streams. The symbol streams are transmitted using T1 resource elements out of N1 resource elements. The T1 resource elements are defined by a first layer-specific signature of length N1, where 1T1<N1. The same process may also be carried out for a second stream of input bits associated with a second data layer using a second layer-specific set of stream-specific modulators and a second layer-specific signature, which may differ from the first layer-specific signature in terms of sparsity pattern and/or sparsity level.

A base station device includes: a processor that executes a process including generating first data, generating an indication signal including a plurality of bits that indicate whether second data that is transmitted at a lower latency than the first data is generated, and generating a transmission signal by mapping the generated indication signal and one of the first data and the second data to each of predetermined unit areas of a resource; and a transmitter configured to transmit the transmission signal generated by the processor.

Methods, systems, and devices are described for hierarchical communications within a wireless communications system. An eNB and/or a UE may be configured to operate within the wireless communications system which is at least partially defined through a first layer with first layer transmissions having a first subframe type and a second layer with second layer transmissions having a second subframe type. The first subframe type may have a first round trip time (RTT) between transmission and acknowledgment of receipt of the transmission, and the second layer may have a second RTT that is less than the first RTT. Subframes of the first subframe type may be multiplexed with subframes of the second subframe type, such as through time division multiplexing.

The present technology relates to a reception device, a reception method, a transmission device, and a transmission method, which are capable of implementing a high transmission rate by effectively utilizing a frequency band in channel bonding. A reception device receives a plurality of divisional streams obtained by distributing baseband (BB) frames of a BB stream which is as a stream of BB frames to a plurality of data slices and reconstructs an original BB stream on the basis of reconfiguration information which is in included in transmission control information and used for reconstructing the original BB stream from the plurality of divisional streams transmitted through the non-neighboring frequency bands when the plurality of divisional streams are transmitted through non-neighboring frequency bands. The present technology can be applied to, for example, channel bonding such as PLP bundling.

Aspects of the description provide a method and devices to allow frequency domain spectral shaping (FDSS) to be used on both a reference sequence and data to enable low PAPR. Being able to use FDSS on both the reference sequence and data allows the FDSS to be transparent to the receiver. The method comprises obtaining a first sequence, wherein the first sequence is a base sequence of a set of base sequences, the set of base sequences comprising sub group base sequences, the first sequence obtained by cyclically repeating the sub group sequences at least once; and transmitting, by the device, a reference signal based on the first sequence.

Apparatuses, computer readable media, and methods for physical layer short feedback. An apparatus of a high efficiency (HE) station is disclosed. The apparatus comprising circuitry configured to: decode a trigger frame for short feedback, the trigger frame comprising an indication of a resource unit (RU) to respond to a short feedback request, where the RU comprises one or more tones and one or more symbols. The circuitry may be further configured to encode a short feedback response to the short feedback request on the RU, where each of the one or more tones of the RU is to be encoded with one or more of: a positive signal, a negative signal, and no signal. The circuitry may be further configured to configure the HE station to transmit the short feedback response to an access point in accordance with orthogonal frequency division multiple access (OFDMA) using resources of the RU.