摘要:
A detecting method of a multiple-input multiple-output system includes the steps of: a) canceling interference between transmit signals by assigning weight values to signals received through a plurality of antennas, and determining K optimal antenna signals through channel gain estimation; b) calculating L transmit signal estimation values by quantizing the optimal antenna signals according to a predefined constellation size of L; c) calculating L residual antenna signals, in which interference of the transmit signal estimation values is removed from the received signals using the L Tx signal estimation values; d) calculating L residual transmit signal estimation values by quantizing the L residual antenna signals according to the predefined constellation size; and e) creating K×L estimated transmit signal candidate groups by repeating the calculation of the L residual transmit signal estimation values for each of the K optimal antenna signals, and detecting transmit signals from the estimated transmit signal candidate groups.
摘要:
Disclosed is a method for controlling a time point for data output in a synchronous memory device, which varies a time point of an internal read command of the synchronous memory device, which is generated in response to an external read command according to the CAS latency of the synchronous memory device. In other words, the time point to generate the internal read command when CAS latency corresponds to 2N+2 (N=0, 1, 2, . . . ) is delayed by 1tCK as compared with the time point to generate the internal read command when CAS latency corresponds to 2N+1, and the 1tCK is a period of an external clock applied to the synchronous memory device.
摘要:
Provided are a method and apparatus for performing a variable point Inverse Fast Fourier Transform (IFFT)/Fast Fourier Transform (FFT). The apparatus for performing a variable point IFFT includes: an IFFT interpolator generating interpolation data signals having a determined point and interpolating a plurality of interpolation data, the number of which depends on an IFFT operation mode signal into input data; an IFFT operator generating IFFT operation data signals by performing an IFFT operation for the interpolated data signals; an IFFT mode selector selecting and outputting some of the IFFT operation data signals in response to the IFFT operation mode signal so that the selected IFFT operation data have the same number of points as the input data; and a control unit outputting the IFFT operation. Therefore, it is possible to easily compute variably sized IFFT/FFT hardware.
摘要:
An optical transceiver case is provided. The optical transceiver case has an optical transmission/reception device and a PCB that operates the optical transmission/reception device. The optical transceiver case includes a lower plate and an upper plate. The lower plate supports the optical transmission/reception device and the printed circuit board, and includes handle grooves formed on both external sides of the lower plate to allow the optical transceiver case to be mounted/detached to/from an optical transmission/reception system's board. The upper plate is coupled to the lower plate to mount the optical transmission/reception device and the printed circuit board, and includes a protuberance embossed on an external upper surface of the upper plate in order to discharge heat generated from the optical transmission/reception device and the PCB to the outside. The optical transceiver case is easily mounted detached to/from on optical transmission/reception system's board and maintains a constant internal temperature.
摘要:
A method and apparatus arc disclosed for transferring multi-source/multi-sink control signals using a differential signaling technique. An “active” state is transferred on a multi-source/multi-sink control signal network by inverting the previous voltage level, and an “inactive state” is transferred by maintaining the previous level. A change in the voltage level associated with a given control signal indicates that at least one node on an SoC device is asserting the corresponding control signal. In order to detect a change in the signal state from a previous cycle, each node includes a memory element, such as a latch, for maintaining the previous state. In this manner, a voltage level from the next interval can be compared to the recorded state to detect a change of state indicating an assertion of the control signal by another node. Thus, a given control signal is asserted whenever the state of the signal at the end of the previous cycle is different from the state of the signal at the end of the proceeding cycle. In one exemplary implementation, the asserted control signal is applied to an exclusive-OR gate together with the current value on the control signal wire to thereby cause a transition indicating an assertion of the control signal.
摘要:
A method and apparatus are provided for inspecting an electrical defectiveness of a liquid crystal display substrate. The method includes shorting ESD protection devices with a conductive shorting bar to form a current path on each of signal wirings of the substrate, supplying a current to the signal wirings, and determining a defectiveness of the signal wirings depending on the current flowing on the signal wirings.
摘要:
The present invention relates to a vacuum cleaner hose manufactured by continuously spirally winding one row or two rows of band-shaped materials extruded with an electric wire inserted therein. The vacuum cleaner hose is formed by spirally winding and sticking a band-shaped material having protrusions connected to each other in a line. In one embodiment, the vacuum cleaner hose is formed from one row of the band-shaped material 2 having a plurality of the hollow protrusions 4 inserted with the electric wire 5 and at least one hollow protrusion 4a inserted with no electric wire 5 is formed into the hose 1. In another embodiment, the vacuum cleaner hose is formed from two rows of the band-shaped materials 2 in which the protrusions of only one row of the band-shaped materials 2 are inserted with the electric wire 5. In still another embodiment, the hose 1 is formed from two rows of the band-shaped materials in which each of the two rows of the band-shaped materials 2 has the hollow protrusions 4 inserted with the electric wire 5, and the hollow protrusions 4a inserted with no electric wire 5. Thus, the amount of use of the electric wire 5 in the hose 1 is reduced.
摘要:
Provided is an access mediator system for mediating convergence services of communication and broadcasting using a non-communicative appliance. The access mediator system includes: a non-communicative appliance access interface unit performing an interface function so as to converge a non-communicative appliance comprising an interface supporting image and voice multimedia data but not including a communication function; a broadband convergence network access interface unit performing an interface function so as to access a broadband convergence network connected to various service provider servers via wire and wireless interfaces; and a main processor accessing a selected service provider server via the broadband convergence network access interface unit to mediate the selected service provider server and the non-communicative appliance.
摘要:
A light emitting device and a method for fabricating the same according to the present invention are advantageous in that since an LLO (Laser Lift Off) process is performed using a thick metal film grown through a growth process, an occurrence rate of a void is remarkably decreased due to dense bonding between metals so that an occurrence rate of a crack can be decreased. Further, the present invention has an advantage in that a metal is filled in trench regions formed through an isolation process for devices, thereby protecting the devices and ensuring excellent heat dissipation. The present invention has a further advantage in that a reflective film is formed on inclined sidewalls of a device-forming thin film layer so that light loss through lateral sides of the device can be reduced, thereby improving optical properties.