Abstract:
A correlation apparatus for frequency synchronization in a broadband wireless access communication system and a correlation method thereof are provided to improve the frequency synchronization performance by performing the frequency synchronization according to the highest correlation value. A frequency synchronizing unit(300) includes a delay and conjugate complex processor(350) and a correlator(340). The delay and conjugate complex processor delays as much as the predetermined interval after the FFT(Fast Fourier Transform) and generates a first signal by multiplying the signal after the FFT(Fast Fourier Transform) processing by the conjugate complex processed reception signal. The correlation unit receives a first signal, a second signal, and a third signal, and obtains the highest correlation value by producing the differential correlation value about the first signal and third signal. The second signal is generated by multiplying the conjugate complex of the reference signal by the delayed signal based on the reference signal. The third signal is produced by the signal delaying the second signal by the conjugate complex signal. A frequency controller(330) performs the frequency synchronization according to the highest correlation value.
Abstract:
An apparatus and a method for compensation of estimation error are provided to improve spectrum leakage and noises by compensating for estimation error of a channel impulse response before selecting a valid channel impulse response. A initial channel estimation machine(403) estimates a primary channel. By performing IFFT calculation in the presumed primary channel value, An IFFT(Inverse Fast Fourier Transform) operator(404) estimates CIR(Channel Impulse Response). A maximum power route detection part(420) detects route has the maximum power reserve about presumed CIR. A CIR error compensation part(430) uses the CIR value and the CIR estimation error function of the maximum power route in order to compensate for the CIR estimation error about all routes.
Abstract:
본 발명은 주파수 동기를 위한 상관 방법에 관한 것으로, 광대역 무선접속 통신시스템에서 수신기의 주파수 동기 방법에 있어서 수신한 신호와 기준신호 사이에 가변 간격의 차동 상관을 수행하여 가장 상관도가 높은 값을 구하는 과정과 상기 가장 상관도가 높은 값에 따라 주파수 동기를 수행하는 과정을 포함하는 것으로 다중 경로 페이딩이 존재하는 직교 주파수 분할 다중 전송 시스템의 실제 수신환경에서 대략적 주파수 동기 성능을 크게 향상시킬 수 있는 이점이 있다. OFDM, 주파수 동기, CAZAC, FFT