Abstract: A rack for supporting items defines a channel or trough to receive support bases or blocks therein. Each support base carries at least one item. One item may be a router bit. The rack and support base(s) may collectively define a router bit storage and display system that can be mounted to a support surface, such as a wall or a router table. The system enables a woodworker to safely store and easily access router bits for use in their router device when needed. The router bits are maintained spaced apart from each other when supported by the rack so as to not damage each other. The system can be modular or modularly expanded to grow with the woodworker such that when the woodworker acquires more router bits, the system can add more racks and support bases to ensure there is adequate room for the woodworker's additional router bits.

Abstract: A rack for supporting items defines a channel or trough to receive support bases or blocks therein. Each support base carries at least one item. One item may be a router bit. The rack and support base(s) may collectively define a router bit storage and display system that can be mounted to a support surface, such as a wall or a router table. The system enables a woodworker to safely store and easily access router bits for use in their router device when needed. The router bits are maintained spaced apart from each other when supported by the rack so as to not damage each other. The system can be modular or modularly expanded to grow with the woodworker such that when the woodworker acquires more router bits, the system can add more racks and support bases to ensure there is adequate room for the woodworker's additional router bits.

Abstract: A rack for supporting items defines a channel or trough to receive support bases or blocks therein. Each support base carries at least one item. One item may be a router bit. The rack and support base(s) may collectively define a router bit storage and display system that can be mounted to a support surface, such as a wall or a router table. The system enables a woodworker to safely store and easily access router bits for use in their router device when needed. The router bits are maintained spaced apart from each other when supported by the rack so as to not damage each other. The system can be modular or modularly expanded to grow with the woodworker such that when the woodworker acquires more router bits, the system can add more racks and support bases to ensure there is adequate room for the woodworker's additional router bits.

Abstract: A modular blast gate for a dust collection system. The blast gate includes first and second regions. The first region has a first configuration and enables securement of a duct of the dust collection system to the first region via a first connector mechanism. The second region has a second configuration different from the first configuration and enables securement of the duct to the second region via a second connector mechanism different from the first connector mechanism. The blast gate is usable to connect differently configured ducts, hoses, or pipes to equipment that generates particulate material. The blast gate is mountable to the equipment or a support surface. Two of the modular blast gates may be joined to one another to enable two ducts to be connected together.

Abstract: A disclosed transmitter for wireless communication includes multiple transmitting antennas, a symbol mapper for mapping an input block including multiple binary bits and representing information to be transmitted to a symbol representing an ordered plurality of complex numbers, a space-time encoder for applying an encoding operator to the symbol to produce a vectorized space-time codeword defining electrical signals to be transmitted by the transmitter, the encoding operator being dependent on a set of predefined stabilizer generators, and circuitry to collectively transmit, by the antennas to multiple receiving antennas of a receiver over a wireless transmission channel, the electrical signals defined by the vectorized space-time codeword. The receiver includes a space-time decoder for recovering the symbol from the electrical signals transmitted by the transmitter using a decoding operation that is based on maximum likelihood inference, and a symbol de-mapper for recovering the input block from the symbol.

Abstract: An apparatus and method are provided for beamforming in a MIMO wireless communication system. A base station includes a first calculator that repeatedly calculates downlink beamforming vectors of the user terminals to calculate the optimal beamforming vectors for the user terminals, a quantizer that quantizes the downlink beamforming vectors in order to transmit information of the downlink beamforming vectors, a control channel transmitter that feeds forward information of the quantized downlink beamforming vectors to the user terminals, a second calculator that calculates the final downlink beamforming vectors of the user terminals, and a beamforming transmitter that sums the beamformed TX signals of the user terminals and transmits the summed TX signals through a plurality of TX antennas.

Abstract: A base station is capable of transmitting a signal in a wireless communication network. The base station decides channel state information matrices of respective channels by determining a state of the channels corresponding to respective transmission antennas. The base station calculates transmission beam forming vectors for the respective transmission antennas by a combination of a dot product and a cross product of the channel state information matrices. Thereafter, the base station beam-forms signals for the respective transmission antennas by using the respective transmission beam forming vectors, and transmitting the beam-formed signals.

Abstract: A precoder and a precoding method in a multiuser multi-antenna system are provided. The precoder includes a channel checker for determining a DownLink (DL) channel condition of terminals in a service coverage area, a pre-compensator for pre-compensating, for channel distortion, signals to be sent to the terminals when a nonlinear algorithm is selected based on the channel condition of the terminals, and an interference remover for canceling interference in a channel by multiplying the pre-compensated signals by inverse channels of the terminals, and for canceling interference between the terminals. Accordingly, the pre-equalization can be carried out without global channel state information, and an increase of the transmit power can be prevented in the permutation.

Abstract: An apparatus and method for interference cancellation in a multi-antenna system are provided. A transmission apparatus includes a channel identifier, a scheduler, an interference canceller, and a transmitter. The channel identifier identifies channel information of each of a plurality of receiving ends located in a service area and neighbor cell interference information on each receiving end. The scheduler selects at least one receiving end. The interference canceller precodes transmitted signals in order to cancel interference between receiving ends located in the same cell and neighbor cell interference. The transmitter transmits the precoded transmitted signals to the selected at least one receiving end.

Abstract: A multiple antenna system for using a relay station with multiple antennas is provided. The system includes a base station for determining encoded data processing procedure based on first and second channel state information, determining a relaying procedure of the relay station, and sending the relaying procedure to the relay station based on the first and second channel state information; wherein the encoded data is terminating to a mobile station; the relay station for receiving data and the relay procedure which the base station sent, converting and sending the data according to the relaying procedure, and sending the first channel state information to the base station as a measured state of channel which receives the data; and the mobile station for receiving the data which the relay station sent, and sending the second channel state information to the relay station as a measured state of channel which receives the data.

Abstract: A base station is capable of transmitting a signal in a wireless communication network. The base station decides channel state information matrices of respective channels by determining a state of the channels corresponding to respective transmission antennas. The base station calculates transmission beam forming vectors for the respective transmission antennas by a combination of a dot product and a cross product of the channel state information matrices. Thereafter, the base station beam-forms signals for the respective transmission antennas by using the respective transmission beam forming vectors, and transmitting the beam-formed signals.

Abstract: An apparatus and method are provided for beamforming in a MIMO wireless communication system. A base station includes a first calculator that repeatedly calculates downlink beamforming vectors of the user terminals to calculate the optimal beamforming vectors for the user terminals, a quantizer that quantizes the downlink beamforming vectors in order to transmit information of the downlink beamforming vectors, a control channel transmitter that feeds forward information of the quantized downlink beamforming vectors to the user terminals, a second calculator that calculates the final downlink beamforming vectors of the user terminals, and a beamforming transmitter that sums the beamformed TX signals of the user terminals and transmits the summed TX signals through a plurality of TX antennas.

Abstract: A multiple antenna system for using a relay station with multiple antennas is provided. The system includes a base station for determining encoded data processing procedure based on first and second channel state information, determining a relaying procedure of the relay station, and sending the relaying procedure to the relay station based on the first and second channel state information; wherein the encoded data is terminating to a mobile station; the relay station for receiving data and the relay procedure which the base station sent, converting and sending the data according to the relaying procedure, and sending the first channel state information to the base station as a measured state of channel which receives the data; and the mobile station for receiving the data which the relay station sent, and sending the second channel state information to the relay station as a measured state of channel which receives the data.