Abstract: An inkjet head unit capable of performing high-resolution pixel printing on a large-size substrate and a substrate treatment apparatus including the inkjet head unit are provided. The substrate treatment apparatus includes: a processing unit supporting and moving a substrate; an inkjet head unit performing pixel printing on the substrate; and a gantry unit moving the inkjet head unit over the substrate, wherein the inkjet head unit includes head packs, which include a plurality of nozzles ejecting a substrate treatment liquid onto the substrate, and a head base, in which the head packs are installed and the head packs are disposed in a single row in the head base.

Abstract: Proposed are an inkjet head unit capable of forming high-resolution pixels on a substrate and inkjet printing equipment including the same. An inkjet head unit of inkjet printing equipment according to one embodiment includes a head pack including a plurality of ejection heads configured to eject ink of the same color to a substrate; and a head base on which a plurality of head packs are installed to be repeatedly coaxially arranged in color order.

Abstract: A method and mobile station are described for reporting channel quality information for multi-cell cooperation. The mobile station receives a channel quality request message for requesting channel quality information from a base station. The channel quality request message indicates that the mobile station is one of a plurality of candidate mobile stations to perform multi-cell cooperation. The mobile station reports the channel quality information to the base station. The channel quality information includes first channel quality information for the base station and second channel quality information for a neighboring base station.

Abstract: A method and mobile station are described for reporting channel quality information for multi-cell cooperation. The mobile station receives a channel quality request message for requesting channel quality information from a base station. The channel quality request message indicates that the mobile station is one of a plurality of candidate mobile stations to perform multi-cell cooperation. The mobile station reports the channel quality information to the base station. The channel quality information includes first channel quality information for the base station and second channel quality information for a neighboring base station.

Abstract: The method for channel information feedback based on multiple cell collaboration comprises a step wherein first channel quality information including the channel information between the terminal and base station is transmitted to the base station; a step wherein after the first channel quality information is sent; a channel quality information request message is received from the base station; and a step wherein in response to the channel quality information request message, second channel quality information is sent, including channel information between the terminal and the base station and adjacent base stations.

Abstract: Disclosed are a feedback-transmitting method and data-transmitting method, and a method for generating a codebook that can be used in a system such as LTE-A. When multiple base stations operate in a cooperative mode, using a codebook generated according to the present invention, an existing codebook for single cell transmission can be used to generate a codebook for cooperative transmission.

Abstract: An uplink scheduling apparatus and method in a communication system are provided. In the uplink scheduling method, a scheduling metric is calculated for each Mobile Station (MS). An MS with a high priority level is selected according to the calculated scheduling metric. The number of subchannels and a product of a modulation order and coding rate (MPR) are extracted according to input variables for the selected MS. The number of subchannels to be allocated to the selected MS is determined according to the MPR and the subchannels are allocated to the selected MS. The scheduling metric is updated for the each MS.

Abstract: A method and apparatus of configuring a multi-cell precoding matrix for a multiple input multiple output (MIMO) operation in a wireless communication system in which a plurality of base stations participate in cooperative communication is provided. A multi-cell precoding matrix is configured using one or more single-cell precoding matrices, and wherein coefficients to be multiplied by the single-cell precoding matrices satisfy a condition in which the product between the multi-cell precoding matrix and a Hermitian matrix of the multi-cell precoding matrix is a unitary matrix. According to the embodiment of the present invention, it is not necessary for all base stations to perfectly know channel information. In addition, a feedback overhead is not high, and complexity is low.

Abstract: A method and apparatus for estimating a velocity of a Mobile Station (MS) in a mobile communication system are provided, in which a Base Station (BS) receives a Channel Quality Indicator (CQI) measured by the MS, calculates a decision metric by calculating variations in the CQI for a predetermined time period, and estimates the velocity of the MS based on the decision metric, referring to a velocity table in which decision metrics are mapped to mobile velocities.

Abstract: A method for transmitting channel information in a multi-antenna system, the method includes calculating channel quality information (CQI) with respect to each mode, comparing the CQI with respect to each mode to a threshold value with respect to each mode, and transmitting CQI with respect to a mode having higher CQI than the threshold value as channel information. Good performance can be achieved regardless of the number of users or an SNR of users.

Abstract: An apparatus and method for Forward link Outer Loop Rate Control (FOLRC) using Hybrid Automatic Repeat reQuest (HARQ) in a mobile communication system are provided. The method includes receiving information, which indicates success or failure in receiving a packet transmitted in a previous frame, from Mobile Stations (MSs); and decreasing an offset value for changing a CINR value in a link table of each MS when Acknowledgement (Ack) is received as the information indicating success or failure in receiving the packet, and increasing the offset value when a signal received as the information indicating success or failure in receiving the packet is other than the Ack. Accordingly, there is an advantage in that a link table adaptive to a channel condition can be obtained.

Abstract: Disclosed are a feedback-transmitting method and data-transmitting method, and a method for generating a codebook that can be used in a system such as LTE-A. When multiple base stations operate in a cooperative mode, using a codebook generated according to the present invention, an existing codebook for single cell transmission can be used to generate a codebook for cooperative transmission.

Abstract: The method for channel information feedback based on multiple cell collaboration comprises a step wherein first channel quality information including the channel information between the terminal and base station is transmitted to the base station; a step wherein after the first channel quality information is sent; a channel quality information request message is received from the base station; and a step wherein in response to the channel quality information request message, second channel quality information is sent, including channel information between the terminal and the base station and adjacent base stations.

Abstract: An apparatus and method for transmitting and receiving Channel Quality Information (CQI) in a communication system. A Base Station (BS) transmits, to a Subscriber Station (SS), a request for CQI of a resource region corresponding to a frequency reuse factor K, which is designated by the BS. The BS then receives, from the SS, the CQI of the resource region corresponding to a channel quality measured by the SS. The channel quality is measured by the SS by measuring a boosted reference signal and compensating the boosted reference signal for a non-boosted signal.

Abstract: Provided is an apparatus and method for enhancing a demodulation performance of a receiver in a Broadband Wireless Access (BWA) system. A receiving apparatus in a broadband wireless communication system includes an estimator, a first calculator, and a second calculator. The estimator estimates a desired signal. The first calculator calculates a correlation matrix of a signal obtained by eliminating the estimated desired signal from a Received (RX) signal. The second calculator performs an interference elimination using the correlation matrix.

Abstract: An apparatus and method for transmitting data in a communication system are provided. The method for transmitting the data includes determining data to be transmitted over a power boosting zone, generating a power boosting zone used for power-boosting and transmitting the data, allocating the data to the generated power boosting zone and power-boosting and transmitting the power boosting zone.

Abstract: A method and apparatus of configuring a multi-cell precoding matrix for a multiple input multiple output (MIMO) operation in a wireless communication system in which a plurality of base stations participate in cooperative communication is provided. A multi-cell precoding matrix is configured using one or more single-cell precoding matrices, and wherein coefficients to be multiplied by the single-cell precoding matrices satisfy a condition in which the product between the multi-cell precoding matrix and a Hermitian matrix of the multi-cell precoding matrix is a unitary matrix. According to the embodiment of the present invention, it is not necessary for all base stations to perfectly know channel information. In addition, a feedback overhead is not high, and complexity is low.

Abstract: An apparatus and method for changing an uplink power control scheme according to mobile status in a TDD mobile communication system are provided. The communication system comprises a Subscriber Station (SS) for transmitting a power control change request message to a Base Station (BS) to change the power control scheme, and the BS for deciding to change the power control scheme between the open loop power control and closed loop power control, and transmitting a power control change response message the SS including the decided power control scheme.

Abstract: A data rate determining method and apparatus in a smart-antenna mobile communication system are provided. A ratio of other-cell interference to AWGN in total noise received at an MS is estimated and a power margin is applied in proportion to highly time-variant other-cell interference. Therefore, despite a change in the other cell interference between a rate decision time and an actual data transmission time, a successful data transmission rate is increased.

Abstract: A method for controlling transmit power of a preamble sequence by a Subscriber Station in an Orthogonal Frequency Division Multiple Access communication system, the system dividing an entire frequency band into a plurality of sub-carrier bands, transmitting an preamble sequence for an Adaptive Antenna System through a predetermined number of sub-carrier bands from among the sub-carrier bands, transmitting a data symbol through remaining sub-carrier bands excluding the sub-carrier bands used for transmitting the preamble sequence.