256- APPARATUS FOR IMPLEMENTING THE 256-TAP MATCHED FILTER FOR CELL SEARCHER IN UMTS SYSTEM

摘要

PURPOSE: A device for implementing a 256-tap matched filter of a mobile communication terminal is provided to use a 16-tap matched filter having much fewer elements, and to implement the 256-tap matched filter, thereby reducing size of the 256-tap matched filter. CONSTITUTION: A counter(200) inputs clock signals, and outputs an upper signal, an intermediate signal, and a lower signal. A 16-tap matched filter(202) inputs the intermediate signal, and outputs 16-tap signals every chip. A sequence-generator(204) inputs the upper signal, and outputs 16 sequences for changing codes of the 16-tap signals. A multiplexer(206) inputs the lower signal, selects one of the 16 sequences, and outputs the selected sequence to a multiplier(208). The multiplier(208) multiplies an output signal of the 16-tap matched filter(202) by an output signal of the multiplexer(206), and outputs the multiplied signals. An adder(210) adds the output signals of the multiplier(208) to data signals, and outputs the added signals to a memory(212). An output buffer(218) outputs data signals only selected by a trigger signal. A memory access controller(220) generates the trigger signal.