METHOD AND APPARATUS FOR ACQUIRING THREE PHASES OF SYNCHRONIZATION FOR ASYNCHRONOUS IMT 2000 USING SUB CORRELATOR

摘要

PURPOSE: A method and an apparatus for acquiring a three phases of synchronization for an asynchronous IMT 2000 using a sub correlator are provided to reduce power consumption and lower the complexity of hardware by constructing a matched filter with an adder tree and an integrator. CONSTITUTION: A signal aligner(6) aligns inputted transmission signal in early signal and late signal. A code generator(9) generates spread codes needed for three phases. Early and late matched filters(10,11) obtain correlation values by using the generated spread coded. A squaring and adding device(13) obtains and adds complex energy from the correlation values. A correlation energy comparator(14) compares a correlation energy between transmission signal and spread codes and a threshold energy. A sorter(15) extracts and sorts a certain number of correlation energy. Synchronous point buffers(16,17) store the correlation energy from the sorter(15) and location index. Searcher buffers(18,19) store correlation energy for multi paths and location index, and transfers locations to a rake receiver. A searcher controller(23) controls an SSCH(Secondary Synchronization Channel) buffer(20) and all blocks.