One embodiment of the present invention relates to a method for transmitting a signal from a device-to-device (D2D) terminal in a wireless communication system, which is a signal transmission method comprising: generating a reference signal sequence; mapping the reference signal sequence on specific symbols; and transmitting a signal comprising the reference signal sequence, wherein the specific symbols are shifted n and m symbols, respectively, away from the fourth symbol of each slot toward a time axis.

A transmitting apparatus is disclosed. The transmitting apparatus includes an encoder to perform channel encoding with respect to bits and generate a codeword, an interleaver to interleave the codeword, and a modulator to map the interleaved codeword onto a non-uniform constellation according to a modulation scheme, and the constellation may include constellation points defined based on various tables according to the modulation scheme.

A transmitter in a wireless communication network comprises a Carrier Interferometry (CI) coder and a multicarrier modulator communicatively coupled to the CI coder. The CI coder encodes a plurality of data symbols with a plurality of CI codes to produce a plurality of CI symbol values, wherein each of the plurality of CI symbol values equals a sum of information-modulated CI code chips. Each information-modulated CI code chip equals a CI code chip multiplied by one of the plurality of data symbols. The modulator modulates each CI symbol value onto a different subcarrier frequency to produce a multicarrier signal.

A user equipment (UE) may transmit a random access message to a wireless node using multiple symbols. The random access message may include repetitions of a random access sequence weighted by a spreading code. For example, a random access sequence may be weighted using different elements of the spreading code, where a first repetition may be weighted with a first element and a second repetition may be weighted using a second element. The weighted random access signals may be spread over multiple symbols and transmitted to the wireless node as the random access message. In some cases, a spreading code may include values of one and negative one, may be based on rows of a Hadamard matrix, or may correspond to a number of symbols used to transmit the random access message.

Methods and devices are disclosed for decoding multiple sparsely encoded data sequences in a wireless communications network. A received signal carrying multiple sparsely encoded data sequences is decoded by selecting a first plurality of the data sequences and performing multi-user decoding on the received signal to decode the first plurality of data sequences. Other data sequences are treated as noise. The plurality of data sequences is selected to meet a collision threshold for the multi-user decoding. Data sequences may be selected based on a collision contribution and signal quality metrics. A modified received signal is generated to remove signals associated with the multiple sparsely encoded data sequences which have been successfully decoded. The method may be performed for additional iterations to select a new plurality of data sequences, and perform the multi-user decoding on the modified received signal to decode additional data sequences, until a stopping condition is met.

The Radiofrequency Identification and Location System represents a novel system and method for locating a Remote Transceiver by means of a Tracking Transceiver whereby the Tracking Transceiver transmits its identification (ID) to the Remote Transceiver which responds with its own ID. The IDs consist of unique PN code sequences which alternately can be PN cover codes and orthogonal codes. A Remote Transceiver can respond to multiple Tracking Transceivers simultaneously while a Tracking Transceiver can receive from multiple Remote Transceivers. By measuring the transit time of its transmitted PN code with respect to the PN code received from a Remote Transceiver, the Tracking Transceiver can measure the distance to that Remote Transceiver and home in gradually.

A transmitting apparatus is disclosed. The transmitting apparatus includes an encoder to perform channel encoding with respect to bits and generate a codeword, an interleaver to interleave the codeword, and a modulator to map the interleaved codeword onto a non-uniform constellation according to a modulation scheme, and the constellation may include constellation points defined based on various tables according to the modulation scheme.

Disclosed are a method for transmitting and receiving an uplink demodulation reference signal (DMRS) in a wireless communication system, and an apparatus therefore. Particularly, a method by which a terminal transmits a DMRS in a wireless communication system comprises the steps of: receiving, from a base station, downlink control information (DCI) for physical uplink shared channel (PUSCH) scheduling; generating a DMRS sequence for the PUSCH; and mapping the DMRS sequence to a physical resource, wherein the DMRS sequence can be mapped with the spacing of a predetermined resource element (RE) within the symbol to which the DMRS sequence is mapped.

A base station includes a reference signal allocator that allocates a first layer of dedicated reference signals and a second layer of reference signals to the same resource elements in a first resource block. The reference signals are allocated to two adjacent resource elements corresponding to a first OFDM symbol and a second OFDM symbol on a first, second, and third subcarriers of the first resource block. The base station also includes a reference signal multiplexer that multiplexes the first layer with the second layer. A first cover code W1 is applied to the first layer. A second cover code W2, different from the first cover code, is applied to the second layer in a first and third subcarriers, and a variation of the second cover code W2′ is applied to the second layer in a second subcarrier.

A method is provided for detection and synchronization for a multistation wireless communication system (WiFi) implementing a layer, termed the MAC or Medium Access Control layer, provided for implementing a multiple access protocol and a physical layer, termed the PHY or Physical Layer, provided for achieving synchronization and detection functions, the MAC layer transmitting commands to the PHY layer so as to carry out the multiple access protocol and the PHY layer generating in response at least one waveform carrying synchronization signals and detection signals, the MAC layer implements an orthogonal or quasi-orthogonal cyclic signal to construct the at least one waveform.