Abstract:
A method for receiving an acknowledgement (ACK)/negative acknowledgement (NAK) signal in an orthogonal frequency division multiplexing (OFDM) communication system is described. The method includes receiving ACK/NAK signals and repetitions of the ACK/NAK signals mapped to one or more OFDM symbols which are allocated for transmission of a plurality of ACK/NAK signals within one sub-frame, and confirming receipt of the ACK/NAK signals. The OFDM symbol for each ACK/NAK signal is determined according to the repetition of the ACK/NAK signals, and frequency regions for the ACK/NAK signals within the OFDM symbols are different from frequency regions for the repetition of the ACK/NAK signals within the OFDM symbols.
Abstract:
A method for transmitting signals for interference randomization is disclosed. The method for transmitting signals includes spreading the transmission signals using a plurality of orthogonal codes and transmitting the transmission signals spread by the plurality of orthogonal codes by a spatial frequency block coding (SFBC) or spatial time block coding (STBC) scheme. Among the plurality of orthogonal codes, codes of which mutual interferences are equal to or greater than a predetermined threshold are grouped to the same group, and orthogonal codes belonging to different groups are used for the spreading of the signals which are transmitted at the same timing. Accordingly, it is possible to realize interference randomization.
Abstract:
A method of transmitting a signal using code division multiplexing (CDM) in order to reduce the influence of channel estimation error in a multi-input multi-output antenna (MIMO) system using transmit diversity is disclosed. That is, the method of transmitting a signal by a transmitter using a plurality of antennas includes code division multiplexing input symbols using codes according to a predetermined spreading matrix, and transmitting the code division multiplexed symbols via the plurality of antennas according to an Alamouti scheme. At this time, the predetermined spreading matrix is set such that a first component and a second component configuring interference due to channel estimation error have orthogonal phases.
Abstract:
A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal.
Abstract:
Provided are a photonic memory device, a method of storing data using the photonic memory device, and a photonic sensor device. The photonic memory device comprises a signal line through which a photon is input; a ring resonator receiving a photon through an input gap that is adjacent to the signal line and storing the photon; and a detect line outputting the photon stored in the ring resonator through an output gap that is adjacent to the ring resonator, wherein data is read/written and stored/deleted by the input/output of the photon.
Abstract:
The non-volatile memory device may include a semiconductor substrate having a body and a pair of fins. A bridge insulating layer may non-electrically connect upper portions of the pair of fins to define a void between the pair of fins. Outer surfaces of the pair of fins are the surfaces of the pair of fins that do not face the void and inner surfaces of the pair of fins are the surfaces of the pair of fins that do face the void. The non-volatile memory device may further include at least one control gate electrode that may cover at least a portion of outer surfaces of the pair of fins, may extend over the bridge insulating layer, and may be isolated from the semiconductor substrate. At least one pair of gate insulating layers may be between the at least one control gate electrode and the pair of fins, and at least one pair of storage nodes may be between the at least one pair of gate insulating layers and the at least one control gate electrode.
Abstract:
A method for efficiently scheduling virtual resource blocks to physical resource blocks is disclosed. In a wireless mobile communication system, for distributed mapping of consecutively allocated virtual resource blocks to physical resource blocks, when nulls are inserted into a block interleaver used for the mapping, they are uniformly distributed to ND divided groups of the block interleaver, which are equal in number to the number (ND) of physical resource blocks to which one virtual resource block is mapped.
Abstract:
A method of allocating wireless resources in a wireless communication system is disclosed. More specifically, the method includes allocating distributed chunks to at least one user equipment (UE) on a frequency domain, wherein the distributed chunks are localized chunks which are allocated to the wireless resources according to a distributed allocation scheme, constructing a map for allocating localized chunks in consideration of the allocated distributed chunks, wherein the localized chunks are the localized chunks allocated to the wireless resources according to a localized allocation scheme, and allocating the localized chunks to the at least one UE after all of the distributed chunks are allocated. Here, the distributed chunks and the localized chunks are mutually exclusive.
Abstract:
A method of transmitting pilot signals in a system which performs communication using two or more earners comprises transmitting first pilots and second pilots from at least one user equipment to a base station, the first and second pilots, which are transmitted from the at least one user equipment, being multiplexed by code division multiplexing, and the first and second pilots, which are transmitted from a specific user equipment, having different transmission powers, and transmitting data from the at least one user equipment to the base station depending on the first pilots and the second pilots. Since many UEs can transmit CQ pilots, exact channel estimation can be performed and thus communication efficiency can be improved.
Abstract:
A method for mapping a physical hybrid automatic repeat request indicator channel (PHICH) is described. The method for mapping a PHICH includes determining an index of a resource element group transmitting a repetitive pattern of the PHICH, according to a ratio of the number of available resource element groups in a symbol in which the PHICH is transmitted and the number of available resource element groups in a first or second OFDM symbol, and mapping the PHICH to the symbol according to the determined index. In transmitting the PHICH, since efficient mapping is performed considering available resource elements varying with OFDM symbols, repetition of the PHICH does not generate interference between neighbor cell IDs and performance is improved.