A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

An apparatus and method for transmission of a single-carrier waveform from multiple transmit antennas including both a reference signal and data in a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbol.

Spatial spreading is performed in a multi-antenna system to randomize an effective channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain N.sub.D data symbol blocks to be transmitted in N.sub.M transmission spans, where N.sub.D1 and N.sub.M>1. The N.sub.D blocks are partitioned into N.sub.M data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via N.sub.T transmit antennas in one transmission span. The N.sub.D data symbol blocks are thus spatially processed with N.sub.M steering matrices and observe an ensemble of channels.

Disclosed is a method of transmitting signals by a transmitting side device having multiple antennas. In this method, the transmitting side device spatially modulates information to be transmitted, where the information is spatially modulated to be represented based on which antennas among the N antennas are selected to be used for transmission. And, the transmitting side device transmits the spatially modulated information through the selected antennas. Here, the number of the selected antennas for transmitting one transmission information unit (hereinafter, M where MN) is plural. And, different sequence of the selected antennas represents different information to be transmitted.

Aspects of the present disclosure relate to a wireless device including one or more processors and a memory storing processor-readable instructions that, when executed by the one or more processors, causes the wireless device to perform operations. The operations include receiving a first message indicating a reuse transmission opportunity associated with a downlink transmission from a first device to a second device. The operations further include determining to participate in the reuse transmission opportunity based at least in part on the downlink transmission. The operations further include, during the reuse transmission opportunity, transmitting uplink communications to the first device concurrently with the downlink transmission from the first device to the second device in the same frequency channel.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may apply an open-loop multiple-input multiple-output (MIMO) scheme among a plurality of antenna groups associated with a plurality of antennas, wherein phase coherence cannot be maintained between the plurality of antenna groups; and may apply a closed-loop MIMO scheme among antennas within each antenna group of the plurality of antenna groups, wherein phase coherence can be maintained between antennas included in each antenna group of the plurality of antenna groups. Numerous other aspects are provided.

Disclosed are a method for transmitting/receiving channel state information in a wireless communication system and a device for same. In particular, a method of reporting channel state information (CSI), by a user equipment (UE) in a wireless communication system comprises the steps of: receiving, from an eNB, a CSI process configuration comprising interference measurement restriction information indicating interference measurement restriction; and reporting, to the eNB, CSI corresponding to a CSI process configured by the CSI process configuration, wherein when a first subframe set and a second subframe set are configured for the CSI process, the interference measurement restriction can be independently configured for each of the first subframe set and the second subframe set.

The present invention provides a WLAN system resource indication method and apparatus. The method includes: generating, by an access point, a frame that carries resource indication information; and sending, to multiple stations, the frame that carries the resource indication information. The resource indication information includes multiple pieces of sub resource indication information. Correspondingly, each piece of the sub resource indication information uniquely corresponds to one of the multiple stations. Therefore, a station side does not need read the entire resource indication information, so as to reduce resource overheads and improve efficiency.

Methods and systems that can enable antenna selection (AS) and data bits in transmitted spatially modulated (SM) streams to be detected at a receiver using different detection methods. In example embodiments, encoding for an AS stream is done separately at a transmitter than encoding for data streams, enabling a receiver to use one type of detection for AS bits and a reduced complexity type of MIMO detection for the data bits.

Systems and methods described herein provide a system for transmitting data on an MIMO channel using a STBC. The system comprises a wireless transmitter. The wireless transmitter obtains plurality of data symbols to transmit, and performs data padding for the plurality of data symbols based on a non-STBC manner. The wireless transmitter further calculates a number of bits per data symbol after the data padding and pre-codes a data symbol from the plurality of data symbols based on available channel information when the number of data symbols is an odd number. The wireless transmitter generates an STBC based on the pre-coded data symbols, and transmits the generated STBC to the MIMO channel.