An interference variance estimation method includes receiving a composite sample comprising a sample of a first OFDM transmission scheme interfered by out-of-band interference of a second OFDM transmission scheme; determining for each of the resource elements of the first transmission scheme a power estimate of the out-of-band interference; and filtering the power estimates over subcarriers corresponding to a same symbol, wherein weights of the filtering are based on a correlation property of the power estimates with respect to the subcarriers. An interference cancellation method includes: receiving the composite sample; determining a first estimate of the out-of-band interference with respect to non-data bearing subcarriers; determining a second estimate of the out-of-band interference with respect to data bearing subcarriers based on the first estimate; and cancelling the out-of-band interference based on the composite signal and the second estimate.

In one aspect, a wireless device receives a first data transmission from a base station in a first subframe interval and transmits HARQ feedback and/or CSI to the base station in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval. In another aspect, a base station transmits a first data transmission to a wireless device in a first subframe interval and receives HARQ feedback and/or CSI from the wireless device in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval.

Disclosed is an uplink (UL) multi-user (MU) transmission method of a station (STA) in a wireless LAN (WLAN) system. An UL MU transmission method of an STA in a WLAN system according to an embodiment of the present invention includes receiving a trigger frame including resource unit allocation information for orthogonal frequency division multiple access (OFDMA) transmission, sending an UL MU physical protocol data unit (PPDU) based on the resource unit allocation information, and receiving an ACK frame for the UL MU PPDU.

The present invention relates to the field of communications technologies, and in particular, to a CSI reporting method, a CSI receiving method, and an apparatus, to resolve a technical problem that PUCCH resource overheads are relatively large during CSI reporting. In embodiments of the present invention, at least two PUCCH resources are configured for each downlink carrier group. CSI that needs to be reported in one uplink subframe may be obtained, and a format of a corresponding PUCCH resource is determined according to the to-be-reported CSI. For example, the determined format is referred to as a first format. Then, all of the to-be-reported CSI is reported after being added to a first first-format PUCCH resource.

An Access Point (AP) performs a Multi-User (MU) transmission by allocating a plurality of resources of an Up-Link (UL) MU transmission to a first plurality of stations, and by transmitting, using one or more 20 MHz channels, a Down-Link (DL) PHY Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU). The DL PPDU includes trigger information. The trigger information solicits the first plurality of stations to participate in the UL MU transmission using the allocated resources. All of the allocated resources may be in the one or more 20 MHz channels of the DL PPDU. The allocated resources may include at least one resource in each of the one or more 20 MHz channels of the DL PPDU.

A system and method that scrambles the phase characteristic of a carrier signal are described. The scrambling of the phase characteristic of each carrier signal includes associating a value with each carrier signal and computing a phase shift for each carrier signal based on the value associated with that carrier signal. The value is determined independently of any input bit value carried by that carrier signal. The phase shift computed for each carrier signal is combined with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristic of the carrier signals. Bits of an input signal are modulated onto the carrier signals having the substantially scrambled phase characteristic to produce a transmission signal with a reduced PAR.

A system and method is disclosed for resource block-specific control signaling in a communication system. Communication data is transmitted using a transmission channel comprising a plurality of resource blocks defined by allocating time-frequency slots in a transmission resource. Resource block control information is transmitted in a “feed-forward” manner to a user end (UE) or group of UEs using channels physically mapped into scheduled resource blocks (RBs) for that user or group of users. Embodiments of the invention provide an RB-specific control channel that comprises RB control elements that are embedded within scheduled resource blocks. The invention, therefore, reduces the amount of control information that must be transmitted by common or shared control channels.

In a communication system in which a base station apparatus and a terminal apparatus communicate with each other, a base station apparatus, a terminal apparatus, and a communication system with which the base station apparatus and the terminal apparatus can efficiently communicate with each other are provided. The terminal apparatus that communicates with the base station apparatus includes a radio resource control section 6011 that configures a plurality of uplink physical channels and that configures an uplink power control-related parameter for each of the plurality of uplink physical channels in accordance with information included in a radio resource control (RRC) signal and a transmission power control section 6015 that sets transmission power of the uplink physical channels on the basis of the uplink power control-related parameters.

A transmitting apparatus according to one aspect of the present disclosure transmits a plurality of first transmission data and a plurality of second transmission data by using an OFDM (Orthogonal Frequency-Division Multiplexing) method. The transmitting apparatus includes frame configuring circuitry, which in operation, generates a frame including a first period in which a preamble is transmitted, a second period in which the plurality of first transmission data is multiplexed by a time division multiplexing method and is transmitted, and a third period in which the plurality of second transmission data is multiplexed by a frequency division multiplexing method and is transmitted; and transmitting circuitry that transmits the frame.

A wireless communication device and a communication method for header repetition are described. The device and method receive and decode a wireless packet through a communication channel. Formats of the wireless packet includes a first packet format and a second packet format. In this regard, the first packet format comprises a first header field carried by a first orthogonal frequency division multiplexing (OFDM) symbol while the second packet format comprises both the first header field carried by the first OFDM symbol and a second header field carried by a second OFDM symbol which follows the first OFDM symbol. The second header field is a repetition of the first header field. According to an exemplary embodiment, the second packet format is distinguished from the first packet format by detecting, from the received wireless packet, the second header field which repeats the first header field.