Abstract: A method and apparatus for transmitting and/or receiving a signal in a multiple input multiple output (MIMO) system are provided. An apparatus for transmitting a signal in a multiple input multiple output (MIMO) system includes an input unit to receive NT symbol streams in parallel, where NT is an integer greater than or equal to 2, a multiple signal generating unit to generate NT multiple signals having a transmit diversity gain by applying a cyclic delay of a different pattern to each of the NT symbol streams, and a multiple signal providing unit to provide the generated NT multiple signals to NT transmit antennas, respectively, based on a predetermined transmit antenna index of each of the NT transmit antennas.

Abstract: A method and apparatus for transmitting and receiving a space block coding signal through Iterative Multi-user Detection is provided. The apparatus includes a multi-user interference cancellation unit which cancels multi-user interference in a received signal and outputs a first signal and a second signal that are sequentially transmitted from two transmitting antennas, a linear combiner which performs linear combination for the first signal and the second signal, and an equalizer which applies different equalization coefficients to the combined first signal and the second signal, respectively, to perform frequency-domain equalization.

Abstract: A method and apparatus for transmitting and receiving data by performing an iterative multi-user detection is provided.

Abstract: A transmitter, a receiver, and a method of supporting a space time block code (STBC) scheme in a single carrier (SC) system based on a unique word (UW) are provided. The transmitter supporting an STBC scheme in an SC system based on a UW includes: a space time (ST) encoder encoding a plurality of symbols, which has been received according to a predetermined pattern, using a space time encoding; a first UW adder generating a first transmission sequence by inserting a first UW after a first symbol, from the encoded plurality of symbols; and a second UW adder generating a second transmission sequence by inserting a second UW after a second symbol, from the encoded plurality of symbols.

Abstract: A receiver for ICI cancellation in a MIMO system is provided, in which a detection orderer determines a subcarrier detection order according to SINRs of subcarriers in an I-CMOS, a detector receives a vector on the subcarriers and a priori information from a decoder according to the subcarrier detection order and iteratively estimates the received vector using the a priori information, and the decoder decodes an ICI-cancelled signal according to the estimate.

Abstract: A test board is provided to reduce the test time for integrated circuits required by the necessity to stabilize bias voltages applied to IC devices. The test board includes a capacitor connected to specific input terminals of the IC device and a capacitor charging circuit connected between the input terminals of the IC device and the capacitor charging circuit via switches. A testing method using this circuit includes the steps of mounting a test board to a tester, placing the IC device onto the test board, charging the capacitor by driving the capacitor charging circuit, and testing the IC devices according to test items. The test board used in this method includes application circuits for applying bias voltages to the IC device, a capacitor connected between the IC device and a ground terminal, and a capacitor charging circuit for charging the capacitor.

Abstract: A test method for testing an integrated circuit (IC) device, including a step of checking the handler contacts with IC devices to be tested after a test apparatus and a handler are completely set up and before actual testing operations commence. The handler contact check device includes a handler contact check board mounted to the handler, which is provided with a plurality of pins directly contacting outer terminals of the IC devices, and wiring circuits for transferring contact check electrical signals from a test apparatus to the contacts between the plurality of pins and the outer terminals, and for transferring output electrical signals from the contacts to the test apparatus, and a contact check package device having the same shape and outer terminals as the IC devices to be tested.