Abstract: In the conventional technique, only an output having a bandwidth identical to the bandwidth of individual DACs has been obtained even by using a plurality of DACs. Also, even when the output of a bandwidth broader than the individual DAC is obtained, there has been a problem associated with asymmetricity of a circuit configuration. In a signal generating device of the present invention, a plurality of normal DACs are combined to realize an analog output of a broader bandwidth beyond the output bandwidth of the individual DACs, and the problem of the asymmetricity of the circuit configuration is also resolved. A desired signal is separated into a low-frequency signal and a high-frequency signal in a frequency domain, and a series of operation of constant (r)-folding the amplitude of the high-frequency signal and shifting it on the frequency axis to superimpose it on the low-frequency signal are made in a digital domain. The output of each DAC is switched by an analog multiplexer.

Abstract: A carrier frequency offset (CFO) tracking circuit includes: a CFO estimation circuit, generating an estimated CFO signal; a loop filter, coupled to the CFO estimation circuit, performing a loop filter operation on the estimated CFO signal according to an initial value to generate a loop filtered result; and an averaging circuit, coupled to the CFO estimation circuit and the loop filter, performing an average operation on the estimated CFO signal to generate the initial value as an average of the estimated CFO signal.

Abstract: The present disclosure provides various modifications to existing techniques for transmitting ACK and/or NACK in an narrow band communications system. For example, in a first aspect, an apparatus receives a downlink transmission and transmits a single tone ACK on an ACK channel using time-spreading. In another aspect, an apparatus determines whether an ACK has been received from a UE within a threshold amount of time, and when an ACK has not been received from the UE for at least the threshold amount of time, transmitting an indication to the UE to transmit regarding the ACK.

Abstract: A transmitting apparatus includes an OFDM modulator that generates a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being arranged at a first position in an in-phase quadrature-phase plane and a second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the modulated second information signal is arranged to a third position in the in-phase quadrature-phase plane, wherein the third position is different from the first position. An OFDM modulation signal includes the first modulation symbol and the second modulation symbol, wherein the OFDM modulation signal comprises a plurality of subcarriers. A transmitter transmits the OFDM modulation signal.

Abstract: In an embodiment, a method includes performing, by a transmit end, transmit power enhancement processing on a target field of a preamble in a wireless local area network (WLAN) system, where the target field includes one or more fields, other than a non-legacy signal field, in a non-legacy field of the preamble in the WLAN system. The method also includes sending, by the transmit end, to a receive end the preamble on which transmit power enhancement processing has been performed.

Abstract: A method, system and computer program for transmitting at least two payloads in a downstream traffic phase of a time-division duplex (TDD) cycle with a single preamble from a headend followed by concatenated payloads without intervening preambles, whereby the payloads are ranked by increasing modulation profiles. The preamble, and concatenated and ordered set of payloads are then transmitted to two or more predetermined customer premise equipments (CPEs).

Abstract: A wireless communication device and method therein for time synchronization in a wireless communication network are disclosed. The wireless communication device determines a first timing (tc) by performing a coarse time synchronization based on a synchronization signal received by the wireless communication device, wherein the received synchronization signal is sampled either in an original sampling rate or a reduced sampling rate. The wireless communication device determines a second timing (tf) by performing a fine time synchronization based on the determined first timing (tc) and the received synchronization signal.

Abstract: Various aspects described herein relate to wireless communications, including generating a waveform including a combined reference signal and control data signal, the reference signal and the control data signal being phase offset from one another in the waveform, and transmitting the waveform on one resource block in a transmission time interval having a duration that is less than a subframe.

Abstract: The present invention relates to a method and apparatus for acknowledgement (ACK) transmission in a WLAN. A station receives a plurality of data frames from a plurality of other stations and then transmits an ACK for the plurality of data frames to the plurality of stations. The ACK is a multi-user (MU) block ACK frame which includes a plurality of block ACKs for the plurality of stations. One block ACK includes at least one ACK for at least one data frame that is received from one station.

Abstract: A method of uplink power control including generating a transmission power control (TPC) sequence from TPC commands received on a series of slots, the series of slots forming one radio frame, calculating a plurality of correlation results by executing correlation calculations between the TPC sequence and a plurality of command sequences, and determining an overall TPC command based on the plurality of correlation results may be provided.

Abstract: In single user OFDM wireless communication, the serial bit stream in a Medium access control Protocol Data Unit (MPDU) to be transmitted may be split up and routed in parallel through different encoding modules. In one embodiment the entire bit stream may be processed through an LDPC, and the output of the LDPC module split up before being routed to different Modulation Modules that each select a separate MCS for the associated sub-band. In another embodiment the bit stream may be split up before being processed separately through multiple LDPC modules, and the output of each LDPC module may then be routed to a different associated Modulation Module for selection of a separate MCS for the associated sub-band.

Abstract: The present specification proposes a method for a user equipment to receive a DM-RS (demodulation-reference signal) from a base station in a multi-antenna-based wireless communication system. Specifically, the method includes the step of configuring a plurality of parameter sets via a higher layer signaling, receiving a downlink control signal including information on an antenna port for the DM-RS and a number of layers, and receiving the DM-RS and a downlink data signal corresponding to the DM-RS based on the downlink control signal. In this case, the downlink control signal comprises an indicator for indicating one of a plurality of the parameter sets and each of a plurality of the parameter sets comprises information indicating a scrambling identifier of the DM-RS.

Abstract: In one example embodiment, a method for allocating resources for device-to-device communications in a wireless communications network includes receiving signaling, by a first wireless device, of a transmission schedule. The transmission schedule includes first transmission opportunities for scheduling requests allocated to a first link and second transmission opportunities for scheduling requests allocated to a second link. Signaling is received from a network node. The signaling carries the information of a grant allocation for at least one buffer status report message. The information may include a first number of buffer status report messages to be transmitted for the first link and a second number of buffer status report messages to be transmitted for the second link after a transmission of a scheduling request for the first link.

Abstract: A method and a user equipment (UE) for receiving, and a method and a base station (BS) for transmitting a UE specific reference signal based-downlink data channel in a wireless communication system are discussed. The method for receiving a UE specific reference signal based-downlink data channel according to an embodiment includes receiving a downlink control channel from a network; and receiving the UE-specific reference signal based-downlink data channel from the network based on the downlink control channel. The downlink control channel includes an indicator indicating one of two or more parameters configured by a higher layer. The two or more parameters indicate antenna ports of a certain reference signal which is assumed to be quasi co-located with antenna ports of a UE-specific reference signal.

Abstract: A signal structure for use in D2D communications is described. In one embodiment, a preamble for automatic gain control at the receiver end is included in the transmitted signal. Techniques for scheduling of D2D transmissions using carrier sensing multiple access (CSMA) and a power control schemes for interference management are also described.

Abstract: The system, apparatus and method of the present invention provides a single carrier block transmission with guard interval as a means of communications over multi-path channels that enables frequency domain equalization, and therefore, has many of the advantages of OFDM, but does not have some of the drawbacks such as high PAPR and the need for high resolution ADCs. While the use of guard intervals in single carrier communications enables low complexity detection of the signal, it reduces bandwidth efficiency. The present invention improves the bandwidth efficiency by adjusting the length of the guard interval adaptively. Also, by allowing both time-domain and frequency domain equalizations, besides improving bandwidth efficiency, the inventions allows for great flexibility in receiver design.

Abstract: A method of transmitting control signals in a wireless communication system includes multiplexing a first control signal with a second control signal in a slot, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, wherein the first control signal is mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain, the RS is mapped to the plurality of RS OFDM symbols, the second control signal is mapped to at least one of the plurality of RS OFDM symbols, and transmitting the first control signal and the second control signal in the slot.

Abstract: In accordance with various embodiments, a method for uplink multiple accessing based on code division multiple access (CDMA) technology and a related system are provided. The method comprises: designing a practical uplink spreading waveform for a code division multiple access (CDMA) based SCN by leveraging a plurality of pseudorandom sequences and investigating a channel coding block and a modulation block for the CDMA based SCN; determining an uplink frequency sub-band division for the CDMA based SCN to optimize a tradeoff between a performance and an implementation cost of CDMA based SCN; and specifying a configuration of a control system of the CDMA based SCN.

Abstract: In a wireless communication base station device, a modulation unit carries out modulation processing for Dch data after coding to generate a Dch data symbol. A modulation unit carries out modulation processing for Lch data after coding to generate an Lch data symbol. An allocation unit allocates the Dch data symbol and Lch data symbol to each sub-carrier composing an OFDM symbol and outputs the allocated sub-carrier to a multiplex unit. In this case, the allocation unit allocates the Dch data symbol to a plurality of resource blocks where one Dch is arranged at an interval equal to integral multiples of the number of resource blocks composing a resource block group.

Abstract: Disclosed are a method and a device for allocating resource units using leftover tones in a wireless LAN. The method for allocating resource units using leftover tones in a wireless LAN may comprise the steps of: an AP generating PPDUs to be transmitted to a plurality of STAs; and the AP transmitting the PPDUs to the plurality of STAs on all frequency bands, wherein the PPDUs are transmitted from each of a plurality of resource unit sets respectively allocated to each of the plurality of STAs, wherein each of the plurality of resource unit sets includes a first resource unit set and a second resource unit set, wherein the first resource unit set includes at least one resource unit, the second resource unit set includes one tone design resource unit, and wherein the tone design resource unit may include at least one other resource unit and at least one additional tone unit.

Abstract: Methods and systems are described for calibrating hardware-induced distortion in a communication system. In one aspect, a calibration signal is transmitted from a base station (BS) to a user equipment (UE). A corresponding amplified version of the transmitted calibration signal is received by the BS from the UE. A composite downlink-uplink channel state information (CSI) is estimated based on the received corresponding amplified version of the transmitted calibration signal. Uplink CSI is estimated based on a reference signal received from the UE. At least one of a phase hardware-induced distortion and an amplitude hardware induced distortion is determined based on the estimated composite downlink-uplink CSI and the estimated uplink CSI.

Abstract: Embodiments disclosed herein relate to methods and systems for pilot grouping, route protocols, and scheduling in multi-carrier communication systems. In an embodiment, an access terminal may group a plurality of pilot signals characterized by different frequencies into one or more pilot groups, each pilot grouping being identified by a plurality of parameters (e.g., a PN offset and a group ID). Each pilot group may include pilot signals having substantially the same coverage area. The access terminal may further select a representative pilot signal from each pilot group for pilot strength reporting. The access terminal may also use the pilot grouping for effective set management.

Abstract: An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.

Abstract: A preamble, a first portion of a data payload, a midamble, and a second portion of the data payload of a single data unit are generated. The midamble is to be transmitted subsequent to transmission of the first portion of the data payload and prior to transmission of the second portion of the data payload. The midamble includes an indication of at least one characteristic of the data payload such as an indication of a size of the second portion of the data payload, or whether or not the data payload includes one or more other portions in addition to the first and second portions. A network interface of a communication device is configured to generate the preamble, the first and second portions of the data payload, and the midamble.

Abstract: A device for processing a received signal by a receiver disrupted by a transmitter, wherein the transmitters and receiver are co-located, includes: a first coupler configured to take a first reference signal; an analog circuit for processing the first reference signal; a second coupler configured to combine the modified reference signal with the signal received by an antenna of the receiver; a first analog-to-digital conversion module digitizing the first reference signal; the second analog conversion module digitizing the combined signal in order to deliver a digital combined signal to the digital signal-processing device, wherein signal-processing device delivers a resulting digital signal to a data-processing module of the receiver device.

Abstract: Described herein are architectures, platforms and methods for implementing an antenna array with a dynamic polarization adjustment in a portable device.

Abstract: A method of modulating and demodulating superposed signals for MUST scheme is proposed. A transmitter takes bit sequences intended for multiple receivers under MUST scheme to go through a “bit sequence to constellation points” mapper before entering the modulators to satisfy the Gray coding rule and to achieve high demodulation performance for the receivers. In a first method, each bit sequence is assigned for each constellation point on the constellation map to satisfy one or more conditions under different power split factors. In a second method, the constellation map is divided into sub-regions according to the clustering of the constellation points for bit sequence assignment. A near-UE may use an ML receiver for demodulation and decoding the superposed signal. A far-UE may use an ML receiver or an MMSE receiver for demodulation and decoding the superposed signal.

Abstract: In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

Abstract: A method and an apparatus for reporting a channel state in a multi-carrier system are provided. User equipment receives an uplink grant including an uplink resource allocation and a channel quality indicator (CQI) request via one downlink carrier from among a plurality of downlink carriers. The user equipment reports CQIs for the plurality of downlink carriers via a plurality of subframes in accordance with the CQI request.

Abstract: A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated.

Abstract: The present invention relates to the field of wireless communications technologies, and in particular, to a terminal, a network device, a paging method, and an area information update method, so as to: in a terminal relay scenario, page a terminal to which another terminal provides a relay service, and update area information of the terminal to which the another terminal provides the relay service. A first terminal provided in embodiments of the present invention includes: a receiving module, configured to receive a paging message, where the paging message carries a terminal identity of a second terminal; and a processing module, configured to: when determining that the second terminal is a terminal to which the first terminal provides a relay service, page the second terminal according to the terminal identity of the second terminal.

Abstract: Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using OTFS pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy OTFS data transmission methods.

Abstract: An embodiment of the present invention relates to a method for generating, by a terminal, a device-to-device (D2D) signal in a wireless communication system, the method comprising the steps of: mapping a sequence for an automatic gain control (AGC) preamble to a resource element; and performing an inverse fast Fourier transform (IFFT) on the mapped AGC preamble, wherein when mapped to the resource element, the sequence for the AGC preamble is repeated N times (N>=0) where N is proportional to a frequency bandwidth if the terminal is a terminal within a coverage.

Abstract: A communication network on board a vehicle is a deterministic switched Ethernet network using virtual links, which includes a set of links, a set of subscribers and at least one switch containing a static configuration table that can be configured according to virtual links passing through this switch. This switch is integrated in a subscriber from the set of subscribers and is connected to the subscriber so as to enable communications between the subscriber and at least one other subscriber of the communication network. The switch includes at least three external communication ports (PE1, PE2, PE3) and the communication network is configured according to a mesh topology such that this switch is connected to at least three other entities corresponding to subscribers and/or switches of the communication network.

Abstract: This disclosure relates to orthogonal frequency division multiple access (OFDMA) communication in wireless local area networks (WLANs). According to some embodiments, a downlink OFDMA frame may be transmitted. An uplink OFDMA frame including acknowledgements associated with the downlink OFDMA frame may be received. The uplink OFDMA frame may be processed, in some instances including determining which devices receiving the downlink OFDMA frame transmitted an acknowledgement associated with the downlink OFDMA frame in the uplink OFDMA frame.

Abstract: The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for notifying D2D communication, the method comprising: generating, by a first UE, a first identity (ID) according to a type of D2D (Device to Device) communication; generating, by a first UE, a first indicator indicating that the first UE is trying to perform the type of D2D communication with at least one second UE; and transmitting, by the first UE, a first MAC PDU (Medium Access Control Protocol Data Unit) including the first ID and the first indicator to that at least one second UE.

Abstract: A technique for receiving and transmitting downlink reference signals is disclosed. When transmitting downlink data demodulation reference signals (DMRS) (or reference signals for downlink data demodulation) by using two or more layers, the DMRS of each layer may be multiplexed by using a code division multiplexing method and then transmitted. The DMRS for each of the two or more layers may be used for one user equipment or for two or more user equipments. And, downlink control signals for transmitting and receiving such DMRS may be configured to have the same format regardless of a single-user mode (or SU-MIMO mode) or a multi-user mode (or MU-MIMO mode), thereby being used.

Abstract: The present invention provides a method and apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port. The method includes: establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and establishing a correspondence between control data carried by the resource element and an antenna port corresponding to the resource element, so as to send or receive, according to a reference signal corresponding to the antenna port, the control data carried by the resource element. The present invention determines a manner for establishing a mapping between a resource on an ePDCCH and an antenna port, and meets a requirement of LTE development.

Abstract: A method is provided for demodulating a signal. A relay node receives control information, from an evolved-NodeB (eNB), through a relay-physical downlink control channel (R-PDCCH), and receives a data, from the eNB, through a physical downlink shared channel (PDSCH). When a number of transmission layers of the PDSCH is 2 or more than 2 and a plurality of reference signals for a demodulation of the data are transmitted on antenna ports by the eNB, a reference signal transmitted on a minimum antenna port among the antenna ports is used for a demodulation of the control information.

Abstract: A high throughput communication apparatus which provides low frame error rates (FER). Error checking encoder and decoders which each comprise a plurality of short blocklength error checking encoders or decoders, respectively, in parallel, coupled through common incremental redundancy. Short-blocklength codes are utilized to achieve communication capacity with incremental redundancy. The system can transmit and decode a large number of short-blocklength codewords in parallel, while it delivers incremental redundancy, without feedback, only to the decoders that need incremental redundancy.

Abstract: Disclosed are a communication method and a MIMO transmitter for measuring the inter-channel relationship of a plurality of resource elements (REs) on the basis of channel information of the plurality of REs, and dividing the plurality of REs in consideration of the measured inter-channel relationship, thereby forming one or more RE groups, and transmitting information on the RE groups to a MIMO receiver.

Abstract: A method for pseudomorphic modulation to mimic a particular type of Radio Frequency (RF) signal transmission in an RF environment may include selecting a physical modulation scheme that is utilized for RF signal transmission in the RF environment. The method may also include pseudorandomly generating a plurality of symbols associated with the physical modulation scheme. The method may further include receiving encoded data for transmitting in the RF environment. The method may also include pseudomorphically modulating the encoded data by mapping the encoded data to the plurality of pseudorandomly generated symbols.

Abstract: A multi-bit HARQ feedback is transmitted by a receiver to a transmitter. The multi-bit feedback is a function of a level of convergence reached by a decoder when the previously transmitted coded data bits were decoded. The transmitter is configured to select a set of coded data bits for a retransmission as a function of the multi-bit feedback. In some embodiments, different redundancy versions of the coded data bits may be selected as a function of the multi-bit feedback. In other embodiments, a bit puncturing or bit repetition pattern may be selected as a function of the multi-bit feedback.

Abstract: The present invention relates to the field of communications technologies, and provides an uplink data transmission method and apparatus. The method includes: determining a size of a to-be-sent data packet; obtaining a time-frequency resource and a data transmission format that correspond to the size of the to-be-sent data packet; and sending the to-be-sent data packet to a base station on the time-frequency resource according to the data transmission format.

Abstract: A method and a user equipment (UE) for transmitting sounding reference signals via multiple antenna ports in a wireless communication system are discussed. The method according to one embodiment includes receiving a parameter via a higher layer; applying a code division multiplexing (CDM) scheme to the sounding reference signals using the parameter; applying a frequency division multiplexing (FDM) scheme to the sounding reference signals when the parameter is a first value; and transmitting the sounding reference signals via the multiple antenna ports.

Abstract: A PSCG feedback-based multi-stream multiuser CQI estimation method and apparatus is provided for estimating multi-stream MU-CQI efficiently based on per-stream channel gain feedback. A feedback information transmission method of a terminal in a wireless communication system according to the present disclosure includes estimating a downlink channel based on a channel state information reference signal transmitted by a base station, determining a number of streams based on the estimated downlink channel, generating the feedback information corresponding to the number of streams, and transmitting the feedback information to the base station.

Abstract: A method of data transmission over guard sub-carriers is provided in a multi-carrier OFDM system. Adjacent radio frequency (RF) carriers are used to carry radio signals transmitted through adjacent frequency channels. A plurality of guard sub-carriers between adjacent frequency channels are aligned and identified for data transmission in a pre-defined physical resource unit. The identified guard sub-carriers do not overlap with normal data sub-carriers of the radio signals transmitted through the adjacent frequency channels. At least one of the identified guard sub-carriers is reserved as NULL sub-carrier. A flexible multi-carrier transceiver architecture is also provided in a multi-carrier OFDM system. Different multi-carrier and/or MIMO/SISO data transmission schemes are implemented by adaptively reconfigure same hardware modules including common MAC layer module, physical layer entities, and RF entities.

Abstract: Provided is a radio communication base station device which can prevent lowering of use efficiency of a channel communication resource for performing a frequency diversity transmission when simultaneously performing a frequency scheduling transmission and the frequency diversity transmission in a multicarrier communication. In the device, a modulation unit (12) executes a modulation process on Dch data after encoded so as to generate a Dch data symbol. A modulation unit (22) executes a modulation process on the encoded Lch data so as to generate an Lch data symbol. An allocation unit (103) allocates the Dch data symbol and the Lch data symbol to respective subcarriers constituting an OFDM symbol and outputs them to a multiplexing unit (104). Here, when a plurality of Dch are used for a Dch data symbol of one mobile station, the allocation unit (103) uses Dch of continuous channel numbers.

Abstract: An example device in accordance with an aspect of the present disclosure includes a direct current (DC) bias source coupled to a transmitter connector of a transmitter. The DC bias source is to apply, onto the transmission line, a DC bias signal isolatable from the transmission protocol by the receiver based on the receiver separating the DC bias signal from the transmission protocol without compromising the transmission protocol.

Abstract: The present invention discloses a method for feeding back channel state information, a method for receiving channel state information, and a device. The method includes: selecting, by a terminal, a precoding matrix from a preset codebook subset for each subband in N subbands according to a configured reference signal, where each precoding matrix in the codebook subset is identified by a first PMI, a second PMI, and a third PMI that is used to indicate a phase relationship, first PMIs corresponding to the precoding matrices selected by the terminal for all subbands in the N subbands are the same, the precoding matrix selected for each subband in the N subbands corresponds to one second PMI, and third PMIs corresponding to the precoding matrices for all subbands in the N subbands are the same; and reporting, by the terminal, the first PMI, the second PMI, and the third PMI.