| 摘要 |
A signal receiving apparatus according to an embodiment of the present invention includes: an amplifier that controls a gain according to a gain control signal and amplifies a received signal to generate an amplified signal; an analog-to-digital (A/D) converter that converts the amplified signal into a digital signal; a Fourier transform unit that performs Fourier transform of the digital signal to a frequency domain signal to generate a Fourier transform signal; a demodulator that demodulates the Fourier transform signal to generate a demodulated signal; and an automatic gain control unit that divides the Fourier transform signal into a noise period and a symbol period, calculates the signal level of the noise period based on the signal level of the symbol period, and generates the gain control signal according to the signal levels of the symbol period and the noise period. Accordingly, when a non-cyclic burst signal is received, the non-cyclic burst signal is divided into a signal presence period and a signal absence period, and the gain is only controlled by using the signal presence period. Therefore, accuracy of the signal level can be secured, and the signal level of the symbol can be calculated in the frequency domain, thereby reducing complexity.
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