摘要:
A method for establishing a cyclic shift sequence to provide against the frequency offset is disclosed. The method calculates a distance between a channel response position of the sequence and an alias channel response position caused by a frequency offset, calculates the number of cyclic shifts per group according to the calculated distance, and establishes the cyclic shift (CS)-applying interval. This method easily establishes a cyclic shift (CS) interval at a specific location having no overlapping by considering a channel response of a reception (Rx) sequence and an alias location of this reception (Rx) sequence, although a reception (Rx) signal is shifted by a channel delay spreading or a propagation delay irrespective of categories of a domain generating a sequence, so that it can greatly reduce the number of the detection errors and the false alarm rate. And, if a sequence of the cyclic shift (CS) is allocated to a cell having a frequency offset of more than a predetermined level, the present invention can minimize the influence of a frequency offset on a high-mobility cell.
摘要:
A method of transmitting data in a wireless communication system includes mapping first data to first symbols on a signal constellation, mapping second data assisting the first data to second symbols on the signal constellation, modulating the first symbols and the second symbols, and transmitting the modulated first symbols and the second symbols, wherein the distance between the first symbols is longer than that between the second symbols on the signal constellation.
摘要:
A method of controlling uplink power in a wireless communication system includes receiving a power control offset with respect to a data burst including user data from a base station, receiving a power control offset with respect to a control burst including control information from the base station, and controlling transmission power of the data burst and transmission power of the control burst according to the power control offset with respect to the data burst and the power control offset with respect to the control burst.
摘要:
A method for generating/transmitting a transmission-unit symbol sequence is disclosed. In the case of transmission information, the information is modulated in time and frequency domains on the basis of a predetermined transmission unit (e.g., a transmission time interval TTI or slot), simultaneous transmission of the information is made, and then a transmission unit symbol is generated/transmitted. A transmission sequence is masked in each symbol contained in one transmission unit. Symbol-unit circular shift (cyclic shift) is applied to the masked result, so that transmission efficiency increases. A control signal transmission method for supporting a variety of formats and a signal transmission method based on a prime-length sequence are also provided.
摘要:
A method for uplink transmission in an OFDMA system is provided. The subcarrier transmission method includes arranging 4 pilot REs at different positions of a frequency axis in a basic unit when the basic unit includes 4 subcarriers on the frequency axis and 6 OFDM(A) symbols in a time axis, arranging data REs at remaining positions of the basic unit, and transmitting the basic unit to a receiving end.
摘要:
A device and method for communicating by a mobile communication terminal in communication with a base station. The method according to an embodiment includes exchanging a frame of data with the base station. The frame of data includes a) a plurality of first subframes each having a first number of orthogonal frequency division multiple access (OFDMA) symbols, and b) a plurality of second subframes each having a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number. One of the second subframes includes an idle symbol.
摘要:
A method for a transmitting side to transmit a sync channel in a wireless communication system using a multicarrier is disclosed. The present invention includes the steps of generating one synchronization channel including a plurality of sub-synchronization channels and the generated multicarrier symbol to a receiving side via the synchronization channel. Accordingly, the present invention enables the transmitting side to efficiently use a radio resource, thereby raising data transmission efficiency of synchronization channel.
摘要:
An apparatus for transmitting a synchronization signal using a plurality of transmit (Tx) antennas is provided. The apparatus includes a synchronization signal generator for generating a synchronization signal used for tracking timing or frequency synchronization, a transmission processor for allocating different subcarriers to a plurality of Tx antennas without overlapping, mapping the synchronization signal to the subcarriers, and generating an orthogonal frequency division multiplexing (OFDM) symbol by performing inverse fast Fourier transformation (IFFT), a control signal coupler for controlling codes as a resource not to overlap among the plurality of Tx antennas, and the plurality of Tx antennas for transmitting the OFDM symbol.
摘要:
A base station transmits a random access response in response to a random access request (random access preamble) of a user equipment. The random access response includes information about a time when the random access request is transmitted and sequence number information of the random access request (random access preamble). The user equipment checks whether the received random access response is the response of the random access request transmitted by the user equipment, using the information about the time when the random access request is transmitted and the sequence number information included in the received random access response.
摘要:
A method of performing communication in a wireless communication system is disclosed. In performing ranging, which is performed by a terminal in a wireless communication system supporting a normal scheme and a legacy scheme, the present invention includes selecting a specific ranging structure from a first ranging structure supporting the normal scheme and a second ranging structure supporting the legacy scheme, and transmitting a ranging signal using the specific ranging structure, wherein the first ranging structure and the second ranging structure are set to differ in at least one of a time resource, a frequency resource and a code resource.