Abstract: A wireless communication apparatus and a control method thereof are provided. The wireless communication apparatus includes: a first communication unit which receives a video signal from an image device; a video processor which processes the video signal; a second communication unit establishes a wireless connection with another device; and a controller receives wireless connection information from the image device through the first communication unit, and controls the second communication unit to establish the wireless connection with the other device based on the received wireless connection information.

Abstract: A method for performing timing synchronization error compensation by a base station in a communication system, in which if there is a need for timing synchronization error compensation of a user equipment, the base station generates a message related to the timing synchronization error compensation, and broadcasts the generated message to the user equipment. In this manner, the base station can notify the user equipment of the need for timing synchronization error compensation in the communication system.

Abstract: A method and apparatus for performing channel estimation in a wireless communication system, in which a channel estimate of each pilot tone included in adjacent first and second resource allocation blocks is calculated. Channel estimates of first pilot tones are detected, which have a predetermined subcarrier spacing or less from the second resource allocation block, channel estimates of second pilot tones are detected; and which have a predetermined subcarrier spacing or less from the first resource allocation block. The channel estimates of the first and second pilot tones are updated, and channel estimation is then performed using the updated channel estimates.

Abstract: A channel estimation method of a channel estimation apparatus in a wireless communication system is provided. The method includes predefining a plurality of weight tables about at least one of a speed and a Carrier to Interference-and-Noise Ratio (CINR) using a correlation value considering offset compensation; selecting a weight table to be used for channel estimation based on at least one of the estimated speed and the CINR, from the plurality of weight tables; and multiplying a pilot channel estimation value and the selected weight table, and performing data channel estimation.

Abstract: A broadband wireless communication system using a plurality of Frequency Allocations (FAs) is provided. A method for packet transmission of a packet of a transmitting end includes dividing one encoded packet into a plurality of parts, mapping a plurality the plurality of parts of the packet to the FAs through the plurality of different FAs transmission, when a re-transmission request is received, re-mapping the plurality of parts of the packet to the FAs such that at least one of the at least one of the plurality of parts is re-mapped to an FA that is different than an FA previously mapped thereto. Retransmitting the encoded packet by at least one of a number of subunits.

Abstract: Provided is an apparatus and method for scheduling for collaborative spatial multiplexing in a broadband wireless communication system. An apparatus for a base station for supporting collaborative spatial multiplexing in a broadband wireless communication system includes a controller, an estimator, and a determiner. The controller selects a second mobile station with the best channel quality among non-scheduled mobile stations. The estimator estimates a load and transmitting (TX) power of the second mobile station. The determiner is used to adjust a modulation and coding scheme (MCS) level of the second mobile station so that a total load of first and second mobile stations when coupled does not exceed a first threshold value and also the power of the second mobile station does not exceed a second threshold value.

Abstract: An apparatus and a method for estimating a Noise and Interference (NI) power in a communication system are provided. The method includes, calculating average values of impulse responses according to ranging codes, through use of a ranging signal sequence received through a resource allocated to a ranging channel, arranging the average values of the impulse responses according to ranging codes in order of the highest value to the lowest value, and multiplying a ranging code, which corresponds to an impulse response having an (x+1)th peak value among the arranged average values of the impulse responses, by a specific threshold value, and estimating the NI power, wherein “x” represents a number of ranging codes which can be simultaneously received by one ranging channel.

Abstract: A substrate bonding apparatus includes a first chamber having a first surface plate where a first substrate is placed. A second chamber is disposed opposite to the first chamber. The second chamber has a second surface plate where a second substrate is placed. The second substrate is to be bonded to the first substrate. An alignment unit is installed in at least one of the first and second chambers. The alignment unit is capable of carrying out a six-degrees-of-freedom alignment between the first and second substrates. Thus, the substrates can be maintained parallel to each other, a spacing between the substrates can be automatically adjusted, and the substrates can be aligned in the X and Y axis directions.

Abstract: An apparatus and method for deciding a target Packet Error Rate (PER) in a wireless communication system are provided. The method includes setting a target PER, comparing a variance of the target PER (?p(k)) with a previous target PER variance (?p(k?1)), and updating a next target PER variance (?p(k+1)) using an average capacity and a previous average capacity in accordance with the comparison result between the target PER variance (?p(k)) and the previous target PER variance (?p(k?1)).

Abstract: A Handover apparatus and method of a Mobile Station (MS) in a wireless communication system in which at least one small cell resides in a macro cell includes, when entering a neighboring small cell, checking a movement speed of the MS. The method also includes determining whether to hand over to the small cell by taking into account the movement speed of the MS. When it is determined not to hand over to the small cell, that MS transmits small cell penetration information to a macro Base Station (BS); allocates a macro only resource from the macro BS; and communicates with the macro BS in the small cell using the macro only resource allocated from the macro BS.

Abstract: An apparatus and method for operating a fast feedback channel in a broadband wireless communication system are provided. The method includes generating and transmitting a feedback signal through a fast feedback channel of a first mode, determining to switch a mode of the fast feedback channel from the first mode to a second mode, transmitting a signal for requesting the mode switching of the fast feedback channel through the fast feedback channel, and generating and transmitting a feedback signal through a fast feedback channel of the second mode.

Abstract: A broadband wireless communication system using a plurality of Frequency Allocations (FAs) is provided. A method for packet transmission of a packet of a transmitting end includes dividing one encoded packet into a plurality of parts, mapping a plurality the plurality of parts of the packet to the FAs through the plurality of different FAs transmission, when a re-transmission request is received, re-mapping the plurality of parts of the packet to the FAs such that at least one of the at least one of the plurality of parts is re-mapped to an FA that is different than an FA previously mapped thereto. Retransmitting the encoded packet by at least one of a number of subunits.

Abstract: A method and apparatus for using a guard band as a data subcarrier in a communication system supporting frequency overlay are provided. In a method of operating mobile station for using a guard band as a subcarrier for signal transmission in a communication system supporting frequency overlay, the method includes searching for a first center frequency located at a position corresponding to an integer multiple of a subcarrier spacing, after searching for the first center frequency, receiving information indicating the numbers n1 and n2 of first additional subcarriers, and performing a first network entry process by using all subcarriers including the first additional subcarriers.

Abstract: An apparatus and method for deciding a target Packet Error Rate (PER) in a wireless communication system are provided. The method includes setting a target PER, comparing a variance of the target PER (?p(k)) with a previous target PER variance (?p(k?1)), and updating a next target PER variance (?p(k+1)) using an average capacity and a previous average capacity in accordance with the comparison result between the target PER variance (?p(k)) and the previous target PER variance (?p(k?1)).

Abstract: Provided is an apparatus and method for scheduling for collaborative spatial multiplexing in a broadband wireless communication system. An apparatus for a base station for supporting collaborative spatial multiplexing in a broadband wireless communication system includes a controller, an estimator, and a determiner. The controller selects a second mobile station with the best channel quality among non-scheduled mobile stations. The estimator estimates a load and transmitting (TX) power of the second mobile station. The determiner is used to adjust a modulation and coding scheme (MCS) level of the second mobile station so that a total load of first and second mobile stations when coupled does not exceed a first threshold value and also the power of the second mobile station does not exceed a second threshold value.

Abstract: A substrate bonding apparatus includes a first chamber having a first surface plate where a first substrate is placed. A second chamber is disposed opposite to the first chamber. The second chamber has a second surface plate where a second substrate is placed. The second substrate is to be bonded to the first substrate. An alignment unit is installed in at least one of the first and second chambers. The alignment unit is capable of carrying out a six-degrees-of-freedom alignment between the first and second substrates. Thus, the substrates can be maintained parallel to each other, a spacing between the substrates can be automatically adjusted, and the substrates can be aligned in the X and Y axis directions.

Abstract: A GaN series surface-emitting laser diode and a method for manufacturing the same are provided. The GaN series surface-emitting laser diode includes: an active layer; p-type and n-type material layers on the opposite sides of the active layer; a first-distributed Bragg reflector (DBR) layer formed on the n-type material layer; an n-type electrode connected to the active layer through the n-type material layer such that voltage is applied to the active layer for lasing; a spacer formed on the p-type material layer with a laser output window in a portion aligned with the first DBR layer, the spacer being thick enough to enable holes to effectively migrate to a center portion of the active layer; a second DBR layer formed on the laser output window; and a p-type electrode connected to the active layer through the p-type material layer such that voltage is applied to the active layer for lasing.

Abstract: A GaN series surface-emitting laser diode and a method for manufacturing the same are provided. The GaN series surface-emitting laser diode includes: an active layer; p-type and n-type material layers on the opposite sides of the active layer; a first-distributed Bragg reflector (DBR) layer formed on the n-type material layer; an n-type electrode connected to the active layer through the n-type material layer such that voltage is applied to the active layer for lasing; a spacer formed on the p-type material layer with a laser output window in a portion aligned with the first DBR layer, the spacer being thick enough to enable holes to effectively migrate to a center portion of the active layer; a second DBR layer formed on the laser output window; and a p-type electrode connected to the active layer through the p-type material layer such that voltage is applied to the active layer for lasing.

Abstract: A GaN series surface-emitting laser diode and a method for manufacturing the same are provided. The GaN series surface-emitting laser diode includes: an active layer; p-type and n-type material layers on the opposite sides of the active layer; a first-distributed Bragg reflector (DBR) layer formed on the n-type material layer; an n-type electrode connected to the active layer through the n-type material layer such that voltage is applied to the active layer for lasing; a spacer formed on the p-type material layer with a laser output window in a portion aligned with the first DBR layer, the spacer being thick enough to enable holes to effectively migrate to a center portion of the active layer; a second DBR layer formed on the laser output window; and a p-type electrode connected to the active layer through the p-type material layer such that voltage is applied to the active layer for lasing.

Abstract: A GaN series surface-emitting laser diode and a method for manufacturing the same are provided. The GaN series surface-emitting laser diode includes: an active layer; p-type and n-type material layers on opposite sides of the active layer; a first distributed Bragg reflector (DBR) layer formed on the n-type material layer; an n-type electrode connected to the active layer through the n-type material layer such that voltage is applied to the active layer for lasing; a spacer formed on the p-type material layer with a laser output window in a portion aligned with the first DBR layer, the spacer being thick enough to enable holes to effectively migrate to a center portion of the active layer; a second BDR layer formed on the laser output window; and a p-type electrode connected to the active layer through the p-type material layer such that voltage is applied to the active layer for lasing.