246results about "Code shifting or hopping" patented technology

A method and an apparatus of transmitting information in a wireless communication system are provided. The method includes transmitting first information based on a first resource index through a first antenna and transmitting second information based on a second resource index through a second antenna.

A method of transmitting a control signal in a wireless communication system is provided. The method includes acquiring a resource index, the number of cyclic shifts (CSs) and a CS interval, wherein the number of CSs is an integer multiple of the CS interval, determining a CS index based on the number of CSs and the CS interval, generating a cyclically shifted sequence by cyclically shifting a base sequence by a CS amount obtained from the CS index, generating a modulated sequence based on the cyclically shifted sequence and a symbol for a control signal and transmitting the modulated sequence after mapping the modulated sequence to a resource block obtained from the resource index.

A method and apparatus for code multiplexing one or more control signals onto a shared control channel. According to the present invention, a control signal for transmission from a base station to a mobile station terminal is repeated in each slot of a predetermined time interval. The control signal in each slot is spread using a bit-level spreading sequence, where the bit-level spreading sequence varies from slot to slot according to a predefined sequence-hopping pattern. The spread control signals generated for transmission to each mobile station terminal are then combined and spread using a common channelization code.

Coding gains can be achieved by encoding binary data directly to multi-dimensional codewords, which circumvents QAM symbol mapping employed by conventional CDMA encoding techniques. Further, multiple access can be achieved by assigning different codebooks to different multiplexed layers. Moreover, sparse codewords can be used to reduce baseband processing complexity on the receiver-side of the network, as sparse codewords can be detected within multiplexed codewords in accordance with message passing algorithms (MPAs).

Provided are an apparatus and method for transmitting/receiving a pilot code pattern used to identify a base station. In the base station, a pilot code pattern determiner determines a code set that includes a number of spreading codes based on a specific ID of the base station. A first spreader spreads a pilot symbol mapped onto an FC with a corresponding spreading code according to the determined code set, and controls gain so as to transmit the pilot symbol at a higher signal level than data. A second spreader spreads data symbols mapped onto the FC with spreading codes of the code set except for the spreading code used for the pilot spreading. A mapper groups a spread signal from the first spreader and spread signals from the second spreader on a TFC basis, and outputs signals that constitute each TFC to points of sub-carriers. An IFFT unit performs an IFFT operation on signals output from the mapper. Because the pilot as well as the data is spread, it is easy to implement the base station. Also, it is possible to identify base stations according to the pilot spreading codes as well as a pilot hopping pattern.

A base station apparatus is used in a mobile communication system that uses an OFDM scheme in a downlink. The base station apparatus includes: a unit configured to perform inverse Fourier transform on a signal in which a first signal and a second signal is mapped to subcarriers with different transmission power density, and to generate a transmission signal; and a transmission unit configured to transmit the transmission signal to a user apparatus. A subcarrier (prohibited subcarrier) in which mapping of the second signal is prohibited is determined such that transmission power density of the second signal is kept constant among a plurality of OFDM symbols regardless of whether the first signal is included in an OFDM symbol including the second signal. The prohibited subcarrier is determined based on a subcarrier to which the first signal is mapped.

The present invention provides a method and apparatus for generating a reference signal sequence by user equipment (UE) in a wireless communication system. The UE receives a UE-specific sequence group hopping (SGH) parameter that is specific to itself, and generates a reference signal sequence based on a base sequence in each slot unit. The base sequence is classified into sequence-group numbers determined in each of the slot units by the UE-specific SGH parameter indicating whether SGH has been carried out, and base sequence numbers.

A method of establishing communication at a tag includes calculating a metric for each of a plurality of automatic frequency control (AFC) hypotheses where the plurality of AFC hypotheses correspond to a timing used by an access point; based on the calculated metrics, identifying one or more relevant AFC hypotheses; performing a check on a demodulated data stream identified using the one or more relevant AFC hypotheses; identifying a valid AFC hypothesis based at least in part on the check; and determining where a frame starts based at least in part on the check.

Methods and apparatuses are provided to enable User Equipments (UEs) to apply Orthogonal Covering Codes (OCC) to the transmission of Reference Signals (RS) generated from Constant Amplitude Zero Auto-Correlation (CAZAC) sequences, to enable hopping of these sequences in a communication system in conjunction with enabling the application of OCC, and to differentiate the application of sequence hopping between transmissions in data channels and transmissions in control channels.

The present invention relates to a method and apparatus for generating a reference signal sequence in a wireless communication system. User equipment receives a cell-specific sequence hopping parameter from a base station, receives, from the base station, a user equipment (UE)-specific sequence group hopping (SGH) parameter which is specific to said user equipment, and generates a reference signal sequence on the basis of a base sequence number of a base sequence, wherein the base sequence number is determined for each slot on the basis of the cell-specific sequence hopping parameter and of the use equipment-specific sequence group hopping parameter. Here, the determination of whether or not to apply sequence hopping to the base sequence number indicated by the user equipment-specific sequence group hopping parameter overrides that of whether or not to apply sequence hopping to the base sequence number indicated by the cell-specific sequence hopping parameter.

A method, an apparatus and a system for configuring a Demodulation Reference Signal (DMRS) are disclosed in the present invention. The method includes: receiving a DMRS indication index transmitted from a network side; determining at least one port used for the local transmission of the DMRS; acquiring the predetermined DMRS configuration parameters corresponding to the DMRS indication index and the at least one port, and configuring, according to the DMRS configuration parameters, the DMRS to be transmitted from the at least one port. Therefore, the terminal can implement the configuration of the DMRS without reloading the corresponding configuration information. Thus, the implementation complexity of the DMRS configuration flow is decreased, and the operation load of the terminal is also reduced.

In a base station of a wireless telephone system, the control channel is set efficiently. A channel group for control information communication is provided as a channel to transmit from a base station in addition to the channel for information communication TCE with the terminal device. Among the channel group for control information communication, the frequency channel where the initial acquisition channel ICH exists is fixed to a predetermined frequency channel, and the time slot in which the initial acquisition information is transmitted is set by a predetermined random number sequence among the frequency channels assigned to the initial acquisition channel ICH to store the set random number information in the initial acquisition information to be transmitted. Then, the time slot in which the initial acquisition channel is transmitted is determined based on the random number obtained by receiving the frequency channel where the initial acquisition channel ICH exists at the terminal device.

Provided are a reference signal transmitting method and device in a multi-antenna system. A terminal generates a plurality of reference signal sequences to which different cyclic shift values are allocated, respectively, generates an orthogonal frequency division multiplexing (OFDM) symbol to which the plurality of reference signal sequences are mapped, and transmits the OFDM symbol to a base station through a plurality of antennas. Each cyclic shift value allocated to each reference signal sequence is determined on the basis of a parameter n indicated by a cyclic shift field transmitted from a physical downlink control channel (PDCCH).

Disclosed are a method and a device for transmitting uplink control information (UCI) by a terminal in a wireless communication system. The UCI transmission method comprises the steps of: generating an encoding information bit stream by performing channel coding for a UCI bit stream; generating complex modulation symbols by performing modulation for the generated encoding information bit stream; spreading the complex modulation symbols in block-wise on the basis of an orthogonal sequence; and transmitting the spread complex modulation symbols to a base station. The encoding information bit stream is generated by a channel coding for circularly repeating the UCI bit stream.

Apparatus and method for communication are provided. The apparatus includes one or more antenna ports; and a processor configured to share a cyclic shift space of reference signals of user equipment utilizing single user multiple input multiple output transmission by applying a cyclic shift increment value between reference signals of different antenna ports or spatial layers of the user equipment transmission.

Both a wireless terminal apparatus and wireless base station apparatus are provided that can, in an operation of encoding the control signals of the upstream link transmitted from the multiple terminal stations while encoding with regard to each of the terminal stations, increase a number of the terminal stations to which different codes are respectively assigned. A wireless terminal apparatus includes: an encoding information receiving portion receiving encoding information which is used at the wireless terminal apparatus from the base station; a phase-shifting unit which conducts a phase-shifting operation on a predetermined first code based on the encoding information; a code selection unit which, based on the received encoding information, selects a second code from multiple codes orthogonally crossing each other; and a control signal encoding portion which conducts an encoding operation on the control signal that is going to be transmitted to the base station by using both the first code on which the phase-shifting operation has been conducted and the second code.

A method for interference randomization of physical uplink control channel (PUCCH), which is used in long term evolution (LTE) system, when multiple terminals multiplex PUCCH to transmit uplink control signallings, the difference of index of control channel resource used by any two terminals in the first timeslot of PUCCH is different from the difference of index of control channel resource used by the two terminals in the second timeslot of PUCCH. The invention can realize interference randomization between UEs that multiplex the same PUCCH.

A method includes generating a first DM-RS for V2X communication and a second DM-RS for V2X communication, the first DM-RS for V2X communication being mapped in a first symbol in a first slot of a subframe, the second DM-RS for V2X communication being mapped in a second symbol in the first slot; generating a third DM-RS for V2X communication and a fourth DM-RS for V2X communication, the third DM-RS for V2X communication being mapped in a first symbol in a second slot of the subframe, the fourth DM-RS for V2X communication being mapped in a second symbol in the second slot; and transmitting the first DM-RS for V2X communication, the second DM-RS for V2X communication, the third DM-RS for V2X communication, and the fourth DM-RS for V2X communication. The first DM-RS is generated based on a first group-hopping, and the second DM-RS is generated based on a second group-hopping.