Abstract: Techniques for changing a Transmission Configuration Indication (TCI) state by a user equipment (UE) operating in a wireless communications system are provided. The UE receives a first message including a TCI state change command from a network and determines, based on the first message, whether a time offset/frequency offset (TO/FO) and a reception (Rx) beam for a new TCI state are known by the UE. Based on the determination, the UE calculates a time delay of the UE to be prepared to receive a reference signal with the new TCI state, generates a second message indicating the time delay of the UE for the new TCI state, and transmits the second message to the network.

Abstract: Wireless communications are described. A user equipment (UE) may receive a configuration message identifying a set of resources available for a plurality of UEs for transmission of feedback indications of multi-cast (or broadcast) transmission to the plurality of UEs, the set of resources comprising a plurality of subsets of resources, each subset of resources being associated with a corresponding channel metric for each UE of the plurality of UEs receiving the multi-cast transmission. The UE may determine that a feedback indication is to be provided in response to the multi-cast transmission. The UE may select, based at least in part on a channel metric of the UE, a first subset of the plurality of subsets of resources to use for transmitting a feedback message including the feedback indication. The UE may transmit the feedback message for the multi-cast transmission using resources within the selected first subset of resources.

Abstract: Apparatuses, methods, and systems are disclosed for determining a precoder for wireless communications. An apparatus includes a processor that determines a precoder for a set of modulation symbols, the determined precoder comprising a plurality of codewords and configured to reduce an ensemble interference and a pairwise interference among the plurality of codewords. The processor precodes the set of modulation symbols based on the determined precoder. The processor maps the precoded set of modulation symbols to a set of physical transmission resources for a transmission layer, wherein a number of modulation symbols in the set of modulation symbols is greater than a number of physical transmission resources in the set of physical transmission resources. The apparatus includes a transceiver that transmits, to a receiver node, an indication of the determined precoder and the set of physical transmission resources.

Abstract: Embodiments of the present invention provide several long training sequences that are in a wireless local area network and that comply with 802.11ax.

Abstract: According to certain embodiments, a method (500) by a wireless device (110) includes receiving information relating to a Narrowband Secondary Synchronization Signal (NSSS) transmit diversity scheme. The information indicates a number of NSSS occasions that use different NSSS transmit diversity configurations. Based on the NSSS transmit diversity scheme, at least one measurement is performed across NSSS occasions.

Abstract: A system and method for beamforming includes providing an antenna including feeds, a coverage area including service areas and data streams for each of the service areas; selecting a cluster of M feeds from the feeds; computing, with a GBBF processor (ground based beam former), M×N weights; generating M feed excitations by distributing the N data streams per the M×N weights; switching an array to transfer a respective one of the M feed excitations to a respective one of the M feeds; and beamforming, with the M feeds of the antenna, N beams. In the method, the N beams are each focused on a respective service area of each of the N data streams, the M×N weights improve the transmitting into the respective service area of each of the N data streams, and at least one of the N beams includes a portion of a plurality of the M feed excitations.

Abstract: Methods, systems, and devices for wireless communication are described. For a user equipment with a number of M greater than or equal to two antennas, a signal is transmitted from at least a first antenna and a second antenna at a first time with an initial relative phase state including a first relative phase rotation between the signals transmitted by the first and second antennas. In response to a determination that a response signal was not received at the user equipment, the signal is retransmitted from at least the first antenna and the second antenna with a subsequent relative phase state among the transmitting antennas, including a second different relative phase rotation, at a second time. The second time may be the next subsequent retransmission of the signal or may be a retransmission following one or more retransmissions using the first relative phase rotation.

Abstract: In one embodiment, a system comprises: a central area node; access points coupled to the central area node and configured to radiate a remote downlink RF signal and receive a remote uplink RF signal; and a controller configured to execute code for a management virtualization system that includes a virtual system controller function configured to establish a plurality of virtual systems and assign physical resources of the system to each of the virtual systems. The management virtualization system includes a northbound interface driver that defines a first virtualized operator interface configured to manage a first set of physical resources assigned to a first virtual system, and a second virtualized operator interface configured to manage a second set of physical resources assigned to a second virtual system.

Abstract: A bit interleaver, a bit-interleaved coded modulation (BICM) device and a bit interleaving method are disclosed herein. The bit interleaver includes a first memory, a processor, and a second memory. The first memory stores a low-density parity check (LDPC) codeword having a length of 16200 and a code rate of 3/15. The processor generates an interleaved codeword by interleaving the LDPC codeword on a bit group basis. The size of the bit group corresponds to a parallel factor of the LDPC codeword. The second memory provides the interleaved codeword to a modulator for 64-symbol mapping.

Abstract: Disclosed is a precoding method comprising the steps of: generating a first coded block and a second coded block with use of a predetermined error correction block coding scheme; generating a first precoded signal z1 and a second precoded signal z2 by performing a precoding process, which corresponds to a matrix selected from among the N matrices F[i], on a first baseband signal s1 generated from the first coded block and a second baseband signal s2 generated from the second coded block, respectively; the first precoded signal z1 and the second precoded signal z2 satisfying (z1, z2)T=F[i] (s1, s2)T; and changing both of or one of a power of the first precoded signal z1 and a power of the second precoded signal z2, such that an average power of the first precoded signal z1 is less than an average power of the second precoded signal z2.

Abstract: An efficient communications apparatus is described for a vector signaling code to transport data and optionally a clocking signal between integrated circuit devices. Methods of designing such apparatus and their associated codes based on a new metric herein called the “ISI Ratio” are described which permit higher communications speed, lower system power consumption, and reduced implementation complexity.

Abstract: Provided is a radio communication device which can separate propagation paths of antenna ports and improve a channel estimation accuracy even when using virtual antennas. The device includes: a mapping unit which maps a data signal after modulation to a virtual antenna and a virtual antenna; a phase inversion unit which inverts the phase of S0 transmitted from an antenna port in synchronization with a phase inversion unit between the odd-number slot and the even-number slot; the phase inversion unit which inverts the phase of R0 transmitted from the antenna port; a phase inversion unit which inverts the phase of S1 transmitted from an antenna port in synchronization with a phase inversion unit; and the phase inversion unit which inverts the phase of R1 transmitted from an antenna port.

Abstract: This invention is a transmission device capable of enhancing the reception characteristics of a terminal when employing transmit diversity using two antenna ports in an ePDCCH. In a base station (100) that transmits a reference signal to a terminal (200) using two antenna ports, a setting unit (102), on the basis of the reception quality of the terminal, sets as the aforementioned two antenna ports either a first antenna port pair for which DMRS (reference signals) do not undergo mutual code multiplexing, or a second antenna port pair for which the DMRS do undergo code multiplexing. A transmitter (109) transmits the DMRS from the two antenna ports set in the setting unit (102).

Abstract: A method implemented in a transmitter/transceiver, the method including mapping any number of elements of an uplink control information (UCI) signal sequence (SS) to available subcarriers for transmitting an OFDM symbol for carrying information associated with a Physical Uplink Shared Channel (PUSCH), each of the subcarriers having at least two layers, precoding the mapped elements as a function of the layer of the subcarrier to which the elements are mapped, wherein a first precoding applied to a mapped element of a first layer of a subcarrier is different than a second precoding applied to a mapped element of a second layer of the same subcarrier, feeding the mapped elements of the UCI SS to an IDFT unit and transforming the mapped elements into an IDFT transformed signal that includes the mapped elements of the UCI SS carried by a plurality of resources for transmission.

Abstract: A method includes receiving a first control command including a value for a first control parameter. The method further includes determining an association between the first control command and an identifier of the first control parameter. The method also includes identifying a graphical user interface (GUI) tool and information of the GUI tool based on the identifier of the first control parameter. The method includes launching a GUI that includes the GUI tool. The method further includes updating the first control parameter using the GUI tool based on the information of the GUI tool and the value for the first control parameter. The method also includes initiating content streaming using a first modulator in response to updating the first control parameter. The method includes identifying performance data for the first modulator associated with the content streaming. The method further includes sending the performance data to a server via the network.

Abstract: This application provides a physical broadcast channel sending/receiving method and an apparatus. In the method, after receiving two broadcast channel signals on two corresponding physical broadcast channels at two time-frequency resource locations, the terminal device determines that information other than an offset of a corresponding time-frequency resource location is the same in two pieces of broadcast information carried in the two broadcast channel signals, obtains a time offset difference between the foregoing two time-frequency resource locations, and generates a scrambling sequence based on the time offset difference; and the terminal device separately descrambles the two broadcast channel signals based on the scrambling sequence and a preset scrambling sequence, thereby implementing joint decoding on the two broadcast channel signals, to obtain one piece of broadcast information.

Abstract: An ultra-wideband (UWB) beam forming system is disclosed. In one or more embodiments, the UWB beam forming system includes a plurality of radiating elements forming a circular, cylindrical, conical, spherical, or multi-faceted array and a beamformer coupled to the radiating elements. The beamformer includes one or more transformable reconfigurable integrated units (TRIUNs) configured to independently control individual radiating elements or groups of radiating elements of the plurality of radiating elements.

Abstract: Methods described herein are for wireless communication systems. One aspect of the invention is directed to a method for a HARQ process, in which the HARQ process includes a first transmission of an encoder packet and at least one retransmission. The method involves allocating a transmission resource for each respective transmission. The method involves transmitting control information from a base station to a mobile station for each respective transmission. The control information includes information to uniquely identify the HARQ process and an identification of one of a time resource, a frequency resource and a time and frequency resource that is allocated for the transmission. In some embodiments of the invention, specific control information is signalled from a base station to a mobile station to enable RAS-HARQ operation. In some embodiments of the invention, retransmission signaling in included as part of regular unicast signaling used for both first transmission and retransmissions.

Abstract: A phase rotator calibration system is provided. The phase rotator calibration system includes a phase rotator portion having input for receiving an input signal and an output for providing an output signal. A calibration portion is coupled to the phase rotator portion. The calibration portion is configured to determine a phase error based on a phase estimation. The phase estimation is generated by way of an arccosine function.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a random access preamble to a base station as part of a two-step random access procedure. The UE may generate the preamble by identifying a discrete Fourier transform (DFT) matrix and generating a set of sequences based on the DFT matrix. Each sequence of the set of sequences may be generated by selecting a column of the DFT matrix and performing deterministic sampling of respective entries from the selected column in accordance with a sampling function. The UE may then select a sequence from the set of sequences based on generating the set of sequence. The UE may transmit the selected sequence to a wireless device (e.g., a base station).

Abstract: An uplink multiple input-multiple output (MIMO) transmitter apparatus includes a transmitter chain that includes a sigma-delta circuit that creates a summed (sigma) signal and a difference (delta) signal from two original signals to be transmitted. These new sigma and delta signals are amplified by power amplifiers to a desired output level before having two signals reconstructed from the amplified sigma and amplified delta signals by a second circuit. These reconstructed signals match the two original signals in content but are at a desired amplified level relative to the two original signals. The reconstructed signals are then transmitted through respective antennas as uplink signals. By employing this uplink MIMO transmitter apparatus, it is possible to use smaller power amplifiers, which may reduce footprint, power consumption, and costs of the uplink MIMO transmitter apparatus.

Abstract: A base station device can transmit data via multiple data channels to a single user equipment device. Each of the multiple data channels can be configured and scheduled via respective downlink control channels to the user equipment device. In an embodiment, the downlink control information and data can be processed in the transmitter via separate coding structures, and then the separate channel data can be combined for transmission to the mobile equipment. The data channels can use overlapping resource elements, and the receiver can use interference cancellation to remove interference from the subsequent data channel after decoding the data from the first data channel. In other embodiments, the data channels can be associated with different beamforming matrices, demodulation reference signal ports, constellation points and resource elements.

Abstract: All data symbols used in data transmission of a modulated signal are precoded by hopping between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol in the frequency domain and the time domain all differ. A modulated signal with such data symbols arranged therein is transmitted.

Abstract: Methods, systems, and devices for wireless communication are described. A base station may determine a mapping configuration for antenna ports that includes mapping antenna ports with high spatial correlation to frequency resource and mapping antenna ports with low spatial correlation to time resources. The base station may apply a common coding mechanism to channel state information reference signals (CSI-RSs) having a timing domain and transmit the CSI-RSs using antenna ports with high frequency separation. A user equipment (UE) may receive the CSI-RS on the channel and identify a joint correlation metric based on a frequency correlation and a spatial correlation between CSI-RS and the channel. The UE may determine a channel estimate for the channel based on the joint correlation metric.

Abstract: An approach for the reliable detection of smartphones within vehicles. The cloud instructs two smartphones, which both detect an in-vehicle detection system, to report signals that reflect major sensor events, together with the timing using their respective clocks. By sending local clock timing and time-sensitive beacon content information to the cloud, the offset between the two smartphone clocks may be determined, thereby enhancing the reliability of the in-vehicle detection of the smartphones.

Abstract: A method comprising receiving, at a first infrastructure equipment of a wireless network, a command from a second infrastructure equipment comprising an indication that a downlink message for a communications device to decode should be transmitted by the first infrastructure equipment and that a wake-up signal should be transmitted by the first infrastructure equipment to the communications device in advance of transmitting the downlink message, and transmitting the wake-up signal to the communications device in advance of transmitting the downlink message to provide the communications device with an indication that the downlink message for the communications device to decode will be transmitted. The wake-up signal comprises a preamble formed by a plurality of Orthogonal Frequency Division Multiplexed, OFDM, symbols, each of the OFDM symbols being modulated with a reference sequence.

Abstract: This application relates to the field of communications technologies, and provides a channel state information measurement method and apparatus, so that a receiver can measure CSI without joining a network of a WiFi transmitter. The method includes: sending, by a CSI request apparatus, a first CREQ frame, a group of session parameters used to transmit a CS frame; receiving, by the CSI request apparatus, a CRSP frame sent by a first CSI response apparatus; receiving, by the CSI request apparatus, the CS frame by using the first session parameter; and measuring, by the CSI request apparatus, the CS frame to obtain CSI. The method is applied to a scenario of positioning or a scenario in which CSI measurement needs to be customized.

Abstract: Example implementations are directed to methods and systems employing a solicited sounding protocol that includes an efficient communication sequence for operating a wireless transceiver transmitting a sounding trigger to one or more beamformees via a forward channel, receiving at least one dedicated training signal from the one or more beamformees via a reverse channel in response to the sounding trigger, and for each of the received dedicated training signal. The method also includes estimating forward CSI derived based on the dedicated training signal from an associated beamformee; and where subsequent packets are precoded with precoding derived from the forward CSI for transmission to the associated beamformee via the forward channel. Example aspects including scheduling multiple dedicated training signals from one or more beamformees based on a single sounding trigger.

Abstract: According to certain embodiments, a method (500) by a wireless device (110) includes receiving information relating to a Narrowband Secondary Synchronization Signal (NSSS) transmit diversity scheme. The information indicates a number of NSSS occasions that use different NSSS transmit diversity configurations. Based on the NSSS transmit diversity scheme, at least one measurement is performed across NSSS occasions.

Abstract: The disclosure relates to a mobile communication system including: a first transmission path configured to transmit a message according to a first radio access technology; a second transmission path configured to transmit the message according to a second radio access technology; and an encoder configured to encode the message by a code before transmission of the message over the first transmission path and the second transmission path, wherein the code comprises at least two subcodes, and wherein the encoder is configured to encode the message intended for transmission over the first transmission path with a first subcode of the at least two subcodes and to encode the message intended for transmission over the second transmission path with a second subcode of the at least two subcodes.

Abstract: Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. A hub-spoke, bent-pipe satellite communications system includes: terminals; gateways; a controller for specifying data for controlling satellite operations in accordance with a frame definition including timeslots for a frame and defining an allocation of capacity between forward and return traffic. The satellite communications system may employ a satellite with a feed array assembly and may use on-board beamforming or ground-based beamforming. Beam hopping within timeslots of the frame may be used to provide coverage to different cells in different time periods. The flexible coverage areas may be provided using changes in satellite position, antenna patterns, or beam resource allocations.

Abstract: A system includes a stream parser, a multiplexer, and a plurality of transmission paths. The stream parser is configured to parse an input data stream for a packet into a plurality of spatial streams for transmission via a plurality of transmission paths over a plurality of wireless channels, respectively. The multiplexer is configured to multiplex data from the stream parser onto the plurality of transmission paths for each of the plurality of spatial streams. The plurality of transmission paths is configured to generate portions of the packet based on outputs of the multiplexer and to transmit the portions of the packet via the plurality of transmission paths over the plurality of wireless channels, respectively, using different carrier frequencies corresponding to different frequency bands for each of the portions of the packet.

Abstract: A transmission method includes generating a first precoded signal and a second precoded signal by performing a precoding process on a first baseband signal and a second baseband signal, outputting a third signal by inserting a pilot signal into the first precoded signal, outputting a fourth signal by applying a first phase change to the second precoded signal, outputting a fifth signal by inserting a pilot signal into the fourth signal, and outputting a sixth signal by applying a second phase change to the fifth signal.

Abstract: [Object] To enable a cell appropriate for a terminal device to be selected when beamforming is performed. [Solution] Provided is a device including: an acquisition unit configured to acquire multiple weight sets for beamforming; and a control unit configured to map a reference signal for measurement to radio resources associated with a weight set in advance for each weight set included in the multiple weight sets, and multiply the reference signal by the weight set.

Abstract: A data modulation method includes dividing, by a terminal device, to-be-sent data into N bit groups, wherein N?2 and N is an integer. The method also includes generating, by the terminal device, N complex symbol groups. An ith complex symbol group is obtained by processing an ith bit group based on a mapping rule corresponding to the ith bit group. The mapping rule corresponding to the ith bit group is determined based on at least a group identity of the ith bit group and a first parameter. The first parameter includes at least one of a pilot parameter, a hopping identity, a terminal device identity, a layer index of a non-orthogonal layer, or a hopping offset. The N bit groups correspond to at least two different mapping rules, 0?i?N?1, and i is an integer. The method further includes sending, by the terminal device, the N complex symbol groups.

Abstract: A configurable wireless communications module may include a first antenna layer having one or more antenna operating at a first wireless radio band; a second antenna layer having one or more antenna operating at a second wireless radio band; and a support structure for supporting the first antenna layer and the second antenna layer in a stacked configuration. The first antenna layer and/or the second antenna layer may be divided into sectors, with a directional antenna assigned to each sector, and with each directional antenna operating on a designated channel. Antenna layers may be individually accessed and removed/inserted for ease of maintenance and enhancement of function. An optional accessory module may support additional sensors and elements beyond antennas to allow for enhanced customization based on the intended application.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a sounding reference signal (SRS) resource set to be used to signal a virtual port used for a physical uplink shared channel (PUSCH) communication, wherein the virtual port is a combination of at least two non-coherent or partially-coherent antenna ports of the UE using precoding and cyclic delay diversity; and transmit an SRS for the at least two non-coherent or partially-coherent antenna ports using one or more resources of the SRS resource set. Numerous other aspects are provided.

Abstract: To adaptively determine a Tx beam subset for random access in a wireless communication system, a method for operating a Mobile Station (MS) includes determining at least one beam subset which satisfies a predefined condition, among a plurality of beam subsets, and transmitting random access preambles using Tx beams of the at least one beam subset. An MS in a wireless communication system includes a controller configured to determine at least one beam subset that satisfies a condition, among a plurality of beam subsets, and a transmitter configured to transmit random access preambles using Transmit (Tx) beams of the at least one beam subset, wherein the plurality of the beam subsets each comprise a plurality of beams radiating to different directions from one another. Other embodiments including a base station and a mobile station are also disclosed.

Abstract: A circuit is described herein. In accordance with one embodiment the circuit includes two or more RF channels, wherein each channel includes an input node, a phase shifter and an output node. Each channel is configured to receive an RF oscillator signal at the input node and to provide an RF output signal at the output node. The circuit further includes an RF combiner circuit that is coupled with the outputs of the RF channels and configured to generate a combined signal representing a combination of the RF output signals, and a monitor circuit that includes a mixer and is configured to receive and down-convert the combined signal using an RF reference signal. Thus a mixer output signal is generated that depends on the phases of the RF output signals.

Abstract: A communication device may comprise a plurality of distributed transceivers and one or more corresponding antenna arrays. A processor may configure a first distributed transceiver to receive signals comprising one or more first data streams via one or more first communication links. The processor may configure a second distributed transceiver to receive signals comprising one or more second data streams via one or more second communication links. The processor may determine a channel response matrix associated with communication of the one or more first data streams via the one or more first communication links and/or the one or more second data streams via the one or more second communication links. The processor may optimize one or both of link capacity and/or link reliability of the one or more first communication links and/or the one or more second communication links based on the determined channel response matrix.

Abstract: Methods, systems, and devices for wireless communication are described. A wireless device may determine that a channel is reciprocal and perform an implicit sounding process. During the implicit sounding process, the wireless device may estimate the uplink channel by measuring a first uplink multi-user multiple input multiple output (MU-MIMO) transmission. The wireless devices may then update the uplink channel estimation based by measuring a second MU-MIMO transmission that is received after a downlink transmission from the wireless device. Based on the updated uplink channel estimation, the wireless device may send a beamformed MU-MIMO transmission to a number of other wireless devices.

Abstract: A wireless communication apparatus includes a channel estimation circuit, a beamforming control circuit, and a transmit (TX) circuit. The channel estimation circuit estimates a channel between the wireless communication apparatus and another wireless communication apparatus during at least one first time slot. The beamforming control circuit determines beamforming coefficients according to the estimated channel. The TX circuit applies the beamforming coefficients to transmission of an output data during at least one second time slot later than the at least one first time slot. During the at least one second time slot, the output data is transmitted to another wireless communication apparatus via multiple antennae. The wireless communication apparatus performs communications according to a normal frequency hopping sequence in compliance with a communication specification.

Abstract: An electronic apparatus including a power transfer module configured to wirelessly transfer power to a power receiver and a controller configured to control the power receiver to transfer power based on voltage applied from the power transfer module to the power receiver.

Abstract: Embodiments of the invention describe a novel solution to enhance network service to devices with limited or no connectivity. Embodiments include network-aware nodes deployed by an end-user or operator which are configured by a network to achieve enhanced coverage, enhanced throughput, enhanced battery life, and mitigation of cell boundary experiences, etc. Embodiments provide these benefits to a specified or non-specified set of user equipment (e.g., neighboring user equipment). The service expansion terminal can be an available user equipment that is idle and that has been volunteered, assigned, or is a dedicated node with limited user interface and designed for carrying out enhanced coverage, enhanced throughput, enhanced battery life, and the mitigation of cell boundary experiences, etc. Embodiments may therefore provide low-cost, flexible deployment, and mobility thereby enabling boundaryless service.

Abstract: A communication device may comprise a plurality of distributed transceivers and one or more corresponding antenna arrays. A processor may configure a first distributed transceiver to receive signals comprising one or more first data streams via one or more first communication links. The processor may configure a second distributed transceiver to receive signals comprising one or more second data streams via one or more second communication links. The processor may determine a channel response matrix associated with communication of the one or more first data streams via the one or more first communication links and/or the one or more second data streams via the one or more second communication links. The processor may optimize one or both of link capacity and/or link reliability of the one or more first communication links and/or the one or more second communication links based on the determined channel response matrix.

Abstract: Accordingly, systems and methods for managing power when the number of training and data tones are increased in a wireless communications system are provided. An L-SIG field is generated that includes a set of data and pilot tones, wherein the pilot tones are inserted between the data tones in the set of data and pilot tones. A plurality of training tones is added to the L-SIG field before and after the set of data and pilot tones. A symbol is generated that includes the L-SIG field, an L-LTF field, and a data field, wherein the training tones of the L-SIG field provide channel estimates for the data field. Power of the L-LTF field is managed relative to power of the L-SIG field in the generated symbol in a time domain.

Abstract: A transmitter is arranged to transmit binary information using a binary amplitude shift keying where information symbols are represented by a signal including a first power state and a second power state. A duration of a bit includes a first part where the second power state is applied irrespective of which binary value being represented, and a second part where a binary value is represented by any of the first power and a third power state or a combination pattern of the first power state and the third power state. The first power state has a higher signal power than the second power state and the third power state. The duration of the second part is equal or less the duration of the first part and the signal power of the first power state is such that the binary values are distinguishably decodable.

Abstract: A signal generation method includes phase-changing baseband signals with respective phase changing patterns to generate respective phase-changed signals, each of the phase changing patterns being different from each other, and inverse-fast-Fourier-transforming the phase-changed signals to respective orthogonal frequency division multiplexing (OFDM) transmission signals. Each phase changing pattern has N candidates for an amount of change in a phase, N being an integer greater than two, and each candidate is periodically selected from the N candidates based on subcarriers of the respective OFDM transmission signals, a phase of the respective baseband signals being changed by the each candidate.

Abstract: The present specification relates to a method for transmitting and receiving signals in a wireless local area network (WLAN) system and an apparatus therefor, the method comprising the steps of: generating a training sub-field consisting of a certain number of orthogonal frequency division multiplexing (OFDM) symbols; and transmitting, to a second STA, a signal including a header field and the training sub-field, wherein the transmitted signal is repeatedly transmitted T times (where T is a natural number) on the basis of information indicated by the header field after a data field.

Abstract: Embodiments are provide for communicating data or other non-control information messages within a downlink control channel directly, rather than in a data channel or broadcast channel. Thereby, radio resource utilization can be substantially improved in the cellular system, such as in the case of transmitting smaller data packets. In an embodiment, a transmitter arranges a set of time-frequency radio resources, associated with a downlink control channel, for transmitting information other than control information sent on the downlink control channel. The transmitter then sends, on the set of time-frequency radio resources, a data information message comprising the information other than the control information. The information other than the control information comprises one of user-specific data information and broadcast data information. A receiver then receives on the downlink control channel, control information and the data information message.