A DEMODULATION APPARATUS FOR BASEBAND PHYSICAL LAYER OF A BASE STATION IN OFDMA SYSTEM, AND A METHOD THEREOF

摘要

The present invention relates to a baseband physical channel demodulation device and method for separating a physical channel from a baseband signal received at a base station in an orthogonal frequency division multiple access system. The base station baseband physical channel demodulation device according to the present invention comprises: an orthogonal frequency division demodulator for performing orthogonal frequency division demodulation and demodulation of a base station baseband digital received signal received from an A / D converter; A channel estimator and equalizer for finding an original channel for each subcarrier from a frequency domain signal received from an orthogonal frequency division demodulator; A pilot information storage unit for extracting pilot information for calculating a signal-to-noise ratio from the channel data received from the channel estimator and equalizer and storing the pilot information in an original position; A frequency hopping pattern extractor for restoring channel data received from the pilot information storage unit according to a frequency hopping pattern; And an SNR calculator that calculates a signal-to-noise ratio (SNR) based on pilot information obtained for each terminal among signals received from the frequency hopping pattern extractor. According to the present invention, an improved channel estimation technique can be used by estimating a channel with an output of an orthogonal frequency division demodulator capable of knowing the position of a subcarrier.;Base station, demodulator, OFDMA, physical channel, baseband