Abstract: A midamble indication method includes sending, by a first device, midamble indication information to a second device. A duration of a midamble indicated by the midamble indication information is greater than or equal to a threshold. The threshold is related to a processing capability of the second device. In a midamble receiving method, the second device receives the midamble according to the indication information.

Abstract: Embodiments of the present invention provide a physical layer protocol data unit PPDU transmission method and a corresponding PPDU transmission apparatus. Application of the method and apparatus in the embodiments of the present invention enables a receive end to quickly determine the starting position of the feature signal sequence by means of blind detection, and ensures that the receive end quickly completes data processing and status switching.

Abstract: A device is configured to calculate a set of channel estimates for a plurality of sub-carriers based on a plurality of pilot-symbols and/or data-symbols carried by said plurality of sub-carriers; calculate a set of equalizers for the plurality of sub-carriers based on the set of channel estimates; perform an equalization on a plurality of data-symbols using the set of equalizers for obtaining a plurality of equalized symbols; perform a soft-slicing or hard-slicing procedure comprising obtaining a plurality of estimated symbols based on the equalized symbols; calculate at least one diagonal-loaded interference-plus-noise covariance matrix, based on the set of estimated symbols; de-map the plurality of data symbols to soft-bits, based on the at least one diagonal-loaded interference-plus-noise covariance matrix, the set of channel estimates or an updated version thereof; and feed the soft-bits to a channel decoder.

Abstract: An antenna device includes a plurality of dipole antennas and a port. Each of the dipole antennas is connected to the port. The plurality of dipole antennas is arranged around the port. Each of the plurality of dipole antennas includes two ends. The ends of the dipole antennas are arranged in a plurality of pairs. Each pair includes one end of one of the dipole antennas and one end of another one of the dipole antennas. The two ends in each pair are arranged in proximity to each other. One or more switches are configured to switch between (1) an omnidirectional state, in which the ends of the dipole antennas are not connected to each other; and (2) a directional state, in which the two ends in each of one or more of the pairs are connected to each other.

Abstract: A radio station, in particular an access point, for client localization in a multipath indoor environment is disclosed. The radio station comprises: a circular antenna array comprising uniform circularly arranged antenna elements; and a processor configured to: transform first input data from the circular antenna array into second input data using a transform that transforms the first steering vector of the circular antenna array into a second steering vector of a virtual linear antenna array; and transform the second input data into third input data by using a transform that transforms the second steering vector of the virtual linear antenna array into a third steering vector of a second virtual linear antenna array, comprising a larger number of antenna elements than the virtual linear antenna array; and determine an angle of arrival based on the third input data.

Abstract: A device on a wireless network generates duration data for determining a duration of a time interval. A transmission is then instructed, by the device, to transmit the duration data and a downlink payload including an aggregated Media Access Control (MAC) layer data unit, the downlink payload being transmitted on first subcarriers. The transmission also includes a trigger that configures the at least one other device on the network to transmit an uplink payload within the time interval, and during at least part of the transmission of the downlink payload, on second subcarriers that are at different frequencies to the first subcarriers.

Abstract: A radio frequency (RF) front end for wireless communications, in particular for use in a half duplex (HD) and/or full duplex (FD) transceiver. The RF front end is based on a quadrature balanced power amplifier (QBPA). The RF front end includes an antenna port for outputting a transmit signal to and receiving a receive signal from an antenna, and a receive port for outputting the receive signal to a signal processing section. Further, the QBPA is configured to receive a transmit input signal at a first port, receive a cancellation input signal at a fourth port, and receive the receive signal at a second port coupled to the antenna port.

Abstract: An apparatus for constructing a pre-DFT sample sequence for an OFDM-signal is provided. The apparatus comprises: a processor configured to construct a pre-DFT sample sequence with a pre-defined length such that it comprises data; and a PTRS-group, wherein the last sample of the PTRS-group is placed within the pre-DFT sample sequence at a pre-defined position located B samples before the end of the pre-DFT sample sequence.

Abstract: A communication transmitter retransmits a Medium Access Control (MAC) Protocol Data unit (MPDU) to a communication receiver over a communication channel using a Hybrid Automatic Repeat reQuest (HARQ) retransmission scheme. The MPDU includes a plurality of information bits. The communication transmitter includes a processor configured to determine the MPDU to be retransmitted based on a Block ACK frame received from the communication receiver, the Block ACK frame indicating previously correctly decoded MPDUs at the communication receiver, and to generate a bit sequence to be transmitted to the communication receiver, wherein the bit sequence comprises the plurality of information bits. The communication transmitter further comprises a communication interface configured to transmit the bit sequence to the communication receiver for retransmitting the MPDU to the communication receiver.

Abstract: An apparatus and method for communications, wherein a communication device comprises a processor configured to perform during a time period a determination if a transmission medium is free for communication, and a transmitter configured to transmit a wake-up signal on the transmission medium if the transmission medium is free.

Abstract: A midamble indication method includes sending, by a first device, midamble indication information to a second device. A duration of a midamble indicated by the midamble indication information is greater than or equal to a threshold. The threshold is related to a processing capability of the second device. In a midamble receiving method, the second device receives the midamble according to the indication information.

Abstract: A transmitter includes a processor configured to convert a primary sequence of modulation symbols into a primary signal using a universal pulse shape. The processor is further configured to convert an auxiliary sequence of modulation symbols, created from the primary sequence, to an auxiliary signal using an altered version of the universal pulse shape. In addition, the processor is configured to combine the primary signal and the auxiliary signal to create a joint output signal.

Abstract: The invention relates to an apparatus for selecting candidates in a K-Best algorithm of a MIMO decoder. The K-Best algorithm uses a layered structure comprising a first layer and subsequent layers. In each subsequent layer 2L candidates are selected by iteratively carrying out a selection step, wherein in the selection step the apparatus is configured to calculate and select at least two candidates having minimum distance values of a candidate group, and after each iteratively carried out selection step, the selected at least two candidates are sent to a further subsequent layer for iteratively generating a further candidate group of 2L candidates in the further subsequent layer.

Abstract: A system of wireless communication by an access point (AP) comprising: a receiver adapted to receive a plurality of messages each originated from one of a plurality of client devices and each indicative of a spectral mask capability thereof; a processor adapted to calculate a channel assignment scheme for allocating bandwidth and/or communication channels to the plurality of client devices based on the spectral mask capability of each of the plurality of client devices; and a transmitter adapted to transmit to each of the plurality of client devices instructions to set transmission frequency based on the calculated channel assignment scheme.

Abstract: This application discloses midamble indication and receiving methods and apparatuses. In the method, a first device sends midamble indication information to a second device, where a duration of a midamble indicated by the midamble indication information is greater than or equal to a threshold, and the threshold is related to a processing capability of the second device; and the second device receives the midamble according to the indication information.

Abstract: A radio frequency (RF) front end for wireless communications, in particular for use in a half duplex (HD) and/or full duplex (FD) transceiver. The RF front end is based on a quadrature balanced power amplifier (QBPA). The RF front end includes an antenna port for outputting a transmit signal to and receiving a receive signal from an antenna, and a receive port for outputting the receive signal to a signal processing section. Further, the QBPA is configured to receive a transmit input signal at a first port, receive a cancellation input signal at a fourth port, and receive the receive signal at a second port coupled to the antenna port.

Abstract: A device resolves a collision between its transmission and a simultaneous transmission of another device. The device is configured to interrupt its transmission, determine a negotiation signal, and determine at least one available resource to occupy with the negotiation signal during a negotiation period. Further, the device is configured to transmit the negotiation signal on the at least one available resource and simultaneously receive a negotiation signal on another resource from at least one other device during the negotiation period. Then, the device is configured to decide, based on all negotiation signals, whether to retransmit the interrupted transmission after the negotiation period.

Abstract: The present disclosure relates to Hybrid Automatic Repeat Request (HARQ) in wireless communication technologies, particularly HARQ for IEEE 802.11, i.e. HARQ for Wi-Fi. One example transmitting device is configured to encapsulate a data unit in a container unit, and encode the container unit into a codeword set of one or more codewords. One example receiving device is configured to receive, from a transmitting device, at least one codeword set of one or more codewords, decode the codewords of the codeword set to obtain a container unit, and decapsulate the container unit to obtain a data unit. A bit-size of the container unit is equal to a bit-size of the codeword set in the transmitting device and the receiving device.

Abstract: The disclosure relates to an access point device (AP) for communicating with a client device (STA). The AP may include a transceiver configured to transmit a first data packet indicating a set of groups, wherein each group of the set of groups is associated with a specific set of transmission parameters. The transceiver of the AP may also be configured to transmit a second data packet indicating an allocation for at least part of the groups. Furthermore, the transceiver of the AP may also be configured to receive a response frame using at least part of random access (RA) resources selected by the STA for the at least part of the groups.

Abstract: Embodiments of the present invention provide a physical layer protocol data unit PPDU transmission method and a corresponding PPDU transmission apparatus. Application of the method and apparatus in the embodiments of the present invention enables a receive end to quickly determine the starting position of the feature signal sequence by means of blind detection, and ensures that the receive end quickly completes data processing and status switching.