Embodiments of the present disclosure describe methods and apparatuses for sidelink control information for vehicle-to-vehicle communications.

A first aggregated MAC protocol data unit (A-MPDU) is generated for transmission over a first frequency segment of a communication channel, and a second A-MPDU is generated for transmission over a second frequency segment of the communication channel. A PHY protocol data unit (PPDU) is generated to include the plurality of A-MPDUs and a second PPDU is generated to include the second A-MPDU. A first transmit processor generates a first RF signal for transmission of the first PPDU over the first frequency segment and a second transmit processor generates a second RF signal for transmission of the second PPDU over the second frequency segment. The first RF signal is transmitted in the first frequency segment simultaneously with the second RF signal being transmitted in the second frequency segment.

Certain aspects of the present disclosure relate to methods and apparatus for implementing a data transmission scheme for Narrow-Band Internet of Things (NB-IoT). A User Equipment (UE) combines pairs of antenna ports to generate at least first and second combined antennas ports. The UE receives reference signals transmitted in a narrow band region of a larger system bandwidth, and for each combined port, adds the references signals received on resource elements (REs) of each of the combined pair of antenna ports. The UE determines channel estimates for each combined antenna port based on the added reference signals for the combined port.

Methods and apparatuses are described herein for transmit diversity in an uplink control channel. A wireless transmit/receive unit (WTRU) may perform a Discrete Fourier Transform (DFT) precoding operation on a data symbol sequence segment to generate a DFT precoded segment. The WTRU may then perform a Space Frequency Block Coding (SFBC) operation on the DFT precoded segment to generate a SFBC processed segment. The data symbols of the DFT precoded segment may be reordered in the SFBC processed segment. The WTRU may map the DFT precoded segment to a first set of contiguous subcarriers and the SFBC processed segment to a second set of contiguous subcarriers. The WTRU may then transmit a first DFT spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) signal on the first set of contiguous subcarriers via a first antenna port and a second DFT-s-OFDM signal on the second set of contiguous subcarriers via a second antenna port.

Embodiments of the present disclosure describe methods and apparatuses for sidelink control information for vehicle-to-vehicle communications.

Embodiments of the present invention provide a data transmission method and apparatus, and the method includes: modulating to-be-sent information bits according to a lower order constellation diagram, and generating 4m lower order modulation symbols; multiplying a precoding matrix Q by a column vector including every four lower order modulation symbols in the 4m lower order modulation symbols, to obtain 4m to-be-sent higher order modulation symbols corresponding to a higher order constellation diagram; and respectively and correspondingly sending the 4m to-be-sent higher order modulation symbols on different carriers of two antennas. The to-be-sent higher order modulation symbols include some or all to-be-sent information bits. Therefore, the same signal can be simultaneously sent on different carriers of multiple antennas, and frequency diversity and space diversity are implemented, so that transceiving performance of data transmission is improved.

The present invention relates to a method and an apparatus for transmitting control and training symbols to improve transmission efficiency in a multi-user wireless communication system. The method for transmitting the control and training symbols in the multi-user wireless communication system according to one embodiment of the present invention comprises the steps of: determining whether a required transmission rate of each data can be satisfied through channel estimation in each of terminals when different data are simultaneously transmitted to each of the terminals; and transmitting a data frame to each of the terminals, the data frame being composed to discriminate the control and training symbols in each of the terminals using a combination of time, frequency, and code area when the required transmission rate of each data is not satisfied according to the determined result.

A bit interleaving method involves applying a bit permutation process to bits of a QC-LDPC codeword made up of N cyclic blocks each including Q bits, and dividing the codeword after the permutation process into a plurality of constellation words each including M bits, the codeword being divided into F×N′/M folding sections (N′ being a subset of N selected cyclic blocks and being a multiple of M/F), each of the constellation words being associated with one of the F×N′/M folding sections, and the bit permutation process being applied such that each of the constellation words includes F bits from each of M/F different cyclic blocks in a given folding section associated with a given constellation word.

A communication apparatus of the present disclosure includes a receiver which, in operation, receives a signal that includes a non-legacy preamble and a data field, the non-legacy preamble comprising a first field for indicating a number of spatial streams (Nss) in the data field and a second field for indicating one of a plurality of modulation and coding schemes (MCSs), wherein two or more frequency diversity transmission schemes are supported and one of the two or more frequency diversity transmission schemes is applied based on a value of the Nss; and circuitry which, in operation, decodes the signal.

An operation method of a first communication node includes generating a plurality of modulation symbols for information bits; determining a symbol mapping pattern based on a number N.sub.t of antennas of the first communication node, a number N.sub.L of spatial layers multiplexed in a same frequency resource, and a number N.sub.SSF of modulation symbols belonging to one space-frequency grid; mapping the plurality of modulation symbols to a space-frequency domain based on the symbol mapping pattern; and transmitting the plurality of modulation symbols mapped to the space-frequency domain to a second communication node using the antennas.