Abstract: An apparatus and method having a de-interleaving memory and a controller is used for de-interleaving interleaved data in a coded orthogonal frequency division multiplexing receiver. The controller generates the correct access addresses of the de-interleaving memory for the data to be de-interleaved, and controls the read and write operations to the de-interleaving memory. The controller comprises an address generator having a plurality of base address generators, and a read/write control circuitry. By using the de-interleaving memory combined with memory address computation for the interleaved data, frequency de-interleaving, block de-interleaving and time de-interleaving are performed in one-stage approach in the COFDM receiver. The memory size is reduced and the circuitry complexity for performing the de-interleaving process is relatively low.

Abstract: A low-complexity and low-latency method and apparatus in multicarrier communication systems is used for protection and transmission of the side information related to peak-to-average power ratio (PAPR) reduction. The side information is encoded by an error-correction code and transmitted through a plurality of reserved sub-carriers. Modulation of the coded side information over the reserved sub-carriers is performed separately without re-performing data modulation. Therefore, the invention dramatically reduces implementation complexity. Determination of the related parameters for PAPR reduction can be based on the PAPR level of data modulated signal with slight degradation in PAPR reduction performance or that of transmitted signal with no degradation in PAPR reduction performance.

Abstract: A method and system for determining a three-dimensional surface profile of an object comprising a plurality of object points. First, a grating projector is provided to direct an incident beam of light having a pattern at the object. Then, a resultantly formed grating image of a line profile of the object is received and stored in a multi-line photoelectric image device. Next, the outputs of the grating projector and the multi-line photoelectric image device are taken together to form the phase shifter and the object is shifted opposite to a phase shifter. The above steps are repeated until all object points are imaged on the multi-line photoelectric image device. Finally, a phase of each object point is determined, each phase transformed and rectified to a height by an appropriate trigonometric algorithm for viewing on a display device.

Abstract: The present invention relates to a novel methods and system for measuring multi-segment LED module. The present method utilizes a camera to photograph an image of the multi-segment LED modules, and proceeds an image vector location algorithm in a computer to ensure the bright part of the photographed image could be captured stably and to overcome rotating and shifting problems of the conventional multi-segment LED modules. By the image-processing steps of the present invention, the problems of low throughput and errors occurred in the prior art could be efficiently resolved.