Abstract: A semiconductor memory device includes: a memory core including memory cells and configured to output core data stored in the memory cells in response to a read request, a command decoder configured to decode at least one command input from an external device, a command log register configured to sequentially store the at least one command in response to a register enable signal and output the at least one command as a command log in response to a command log read signal, and a mode register set configured to generate the register enable signal or the command log read signal in response to a mode register set command transmitted to the command decoder.

Abstract: A signal receiving device includes a sampling device configured to sample an input signal to output a plurality of sampling values, and an output circuit configured to output data based on the sampling values. The output circuit outputs the data by performing majority voting based on first to third sampling values of the sampling values in response to a first control signal, and outputs the data and first and second error count signals based on the first sampling value and fourth and fifth sampling values of the sampling values in response to a second control signal. The first error count signal is generated by comparing the first sampling value sampled under a reference condition with the fourth sampling value sampled under a first offset condition, and the second error count signal is generated by comparing the first sampling value with the fifth sampling value sampled under a second offset condition.

Abstract: A semiconductor memory device includes: a memory core including memory cells and configured to output core data stored in the memory cells in response to a read request, a command decoder configured to decode at least one command input from an external device, a command log register configured to sequentially store the at least one command in response to a register enable signal and output the at least one command as a command log in response to a command log read signal, and a mode register set configured to generate the register enable signal or the command log read signal in response to a mode register set command transmitted to the command decoder.

Abstract: A signal receiving device includes a sampling device configured to sample an input signal to output a plurality of sampling values, and an output circuit configured to output data based on the sampling values. The output circuit outputs the data by performing majority voting based on first to third sampling values of the sampling values in response to a first control signal, and outputs the data and first and second error count signals based on the first sampling value and fourth and fifth sampling values of the sampling values in response to a second control signal. The first error count signal is generated by comparing the first sampling value sampled under a reference condition with the fourth sampling value sampled under a first offset condition, and the second error count signal is generated by comparing the first sampling value with the fifth sampling value sampled under a second offset condition.

Abstract: A memory device includes an interface unit and a memory unit. The interface unit receives a clock signal, a command signal and a data signal, internally adjusts input impedance based upon at least one of the command signal and the clock signal, and generates internal control signal of the memory device based upon the command signal and data signal. The memory unit performs read/write operations based upon the internal control signal.

Abstract: A method for managing radio resource of a femto cell includes: providing, by the femto cell, a service to one or more UEs by using most of pre-set radio resource; receiving measurement results from the one or more UEs; determining whether or not one or more neighbor femto cells are closely located nearby based on the measurement results; and if it is determined that neighbor femto cells are closely located nearby, reducing the pre-set radio resource into a small radio resource and providing a service with the small radio resource.

Abstract: The present invention relates to an apparatus and method for arbitrating radio resources between femto base stations in which, when handover of a terminal takes place between femto base stations, the handover is carried out by reallocating radio resources of a serving femto base station assigned to the terminal to a target femto base station, to rearbitrate the radio resources and reduce the time required for rearbitration, thereby enhancing communication effectiveness.

Abstract: Disclosed is a method for relaying data in a multi-hop cellular system, the method including receiving by a terminal from a base station a notification as to whether the terminal is decided as a candidate for a relay, deciding by the terminal whether to be a representative candidate terminal for the relay according to a channel state with the other terminals within a coverage of the base station if the terminal is decided as the candidate for the relay, sending by the terminal to the base station a notification if the terminal is decided as the representative candidate terminal, and relaying data received from the other terminals to calculate relay probability terminals to the base station if the terminal is notified from the base station as to that the terminal is finally decided as the relay.

Abstract: Disclosed are a method and apparatus capable of enhancing a closed loop multi-input multi-output (MIMO) capacity through distributed discrete power control in the case of cooperatively transmitting information to multiple users through a downlink.

Abstract: Disclosed are an apparatus and method for determining a frame structure for reducing interference between users using the same frequency band in a communication system using a cognitive radio, the method including, collecting channel status information related to a primary user with a priority to occupancy of a predetermined frequency band, executing spectrum sensing for the frequency band to check whether the primary user's traffic exists, deciding a length of a data frame to be transmitted in consideration of interference to the primary user based upon the collected channel status information if a channel in which the primary user's traffic is not present is sensed through the spectrum sensing, constructing a data frame based upon the decided frame length to transmit via the sensed channel, and re-executing the spectrum sensing for the channel, if data to be additionally transmitted exists, and rechecking whether the primary user's traffic is present.

Abstract: Disclosed is a method for receiving data in a Multi Input Multi Output (MIMO) system, the method comprising: decoding data transmitted from a transmitter by using one beam-forming vector included in a codebook that beam-forming vectors are formed in a hierarchical structure according to at least one of change directions of radio channels, the number of channel change directions, and a change rate; determining whether to update the beam-forming vector based on the radio channel changes; selecting other beam-forming vector included in the codebook having a hierarchical structure when it is determined that update for the beam-forming vector is required; feed-backing information about an index indicating where the selected beam-forming vector is located in the hierarchical structure of the codebook to the transmitter; and decoding data received from the transmitter by using the selected beam-forming vector.

Abstract: Provided are a semiconductor package, a semiconductor memory module including the semiconductor package, and a system including the semiconductor memory module. The semiconductor package may include a plurality of main terminals arranged on a surface of the semiconductor package with constant intervals, and the plurality of main terminals may include terminals of a first set including a plurality of input/output terminals to which test signals may be input, and terminals of a second set including a plurality of input/output terminals to/from which signals other than the test signals may be input/output.

Abstract: A test mode control circuit is provided to strictly allow entry into a test mode or prevent a boot failure from occurring during a boot operation for a built-in parallel bit test. The test mode control circuit includes a latch, a real entry signal detector, an entry determinator, and a mode control signal generator. When a real entry signal is detected, the entry signal determinator generates an entry determination signal and a test mode control signal is obtained from the mode control signal generator.

Abstract: A non-volatile memory device having a hidden cell located separate from data storage cells, and a method of effectively managing an erase count of the non-volatile memory device. The method includes preparing the non-volatile memory device that includes a hidden cell located separate from data storage cells and is not accessible to users of the data storage cells, and increasing an erase count stored in an erase count storing region of the hidden cell corresponding to at least one erased data storage cell when the at least one data storage cell is erased.

Abstract: The present invention relates to an apparatus and method for arbitrating radio resources between femto base stations in which, when handover of a terminal takes place between femto base stations, the handover is carried out by reallocating radio resources of a serving femto base station assigned to the terminal to a target femto base station, to rearbitrate the radio resources and reduce the time required for rearbitration, thereby enhancing communication effectiveness.

Abstract: A method for managing radio resource of a femto cell includes: providing, by the femto cell, a service to one or more UEs by using most of pre-set radio resource; receiving measurement results from the one or more UEs; determining whether or not one or more neighbor femto cells are closely located nearby based on the measurement results; and if it is determined that neighbor femto cells are closely located nearby, reducing the pre-set radio resource into a small radio resource and providing a service with the small radio resource.

Abstract: Disclosed are an apparatus and method for determining a frame structure for reducing interference between users using the same frequency band in a communication system using a cognitive radio, the method including, collecting channel status information related to a primary user with a priority to occupancy of a predetermined frequency band, executing spectrum sensing for the frequency band to check whether the primary user's traffic exists, deciding a length of a data frame to be transmitted in consideration of interference to the primary user based upon the collected channel status information if a channel in which the primary user's traffic is not present is sensed through the spectrum sensing, constructing a data frame based upon the decided frame length to transmit via the sensed channel, and re-executing the spectrum sensing for the channel, if data to be additionally transmitted exists, and rechecking whether the primary user's traffic is present.

Abstract: Disclosed are a method and apparatus capable of enhancing a closed loop multi-input multi-output (MIMO) capacity through distributed discrete power control in the case of cooperatively transmitting information to multiple users through a downlink.

Abstract: Disclosed is a method for receiving data in a Multi Input Multi Output (MIMO) system, the method comprising: decoding data transmitted from a transmitter by using one beam-forming vector included in a codebook that beam-forming vectors are formed in a hierarchical structure according to at least one of change directions of radio channels, the number of channel change directions, and a change rate; determining whether to update the beam-forming vector based on the radio channel changes; selecting other beam-forming vector included in the codebook having a hierarchical structure when it is determined that update for the beam-forming vector is required; feed-backing information about an index indicating where the selected beam-forming vector is located in the hierarchical structure of the codebook to the transmitter; and decoding data received from the transmitter by using the selected beam-forming vector.

Abstract: A memory device includes an interface unit and a memory unit. The interface unit receives a clock signal, a command signal and a data signal, internally adjusts input impedance based upon at least one of the command signal and the clock signal, and generates internal control signal of the memory device based upon the command signal and data signal. The memory unit performs read/write operations based upon the internal control signal.