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1. (WO1999012305) FAST FOURIER TRANSFORM WINDOW POSITION RECOVERY APPARATUS FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM RECEIVER

Pub. No.:    WO/1999/012305    International Application No.:    PCT/KR1998/000269
Publication Date: Mar 11, 1999 International Filing Date: Aug 31, 1998
IPC: H04L 27/26
Applicants: SAMSUNG ELECTRONICS CO., LTD.
Inventors: PARK, So, Ra
KIM, Dong, Kyu
CHOI, Hyung, Jin
Title: FAST FOURIER TRANSFORM WINDOW POSITION RECOVERY APPARATUS FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM RECEIVER
Abstract:
A fast Fourier transform (FFT) window position recovery apparatus in an orthogonal frequency division multiplexing (OFDM) receiver is provided. In the FFT window position recovery apparatus in an OFDM system receiver which receives an OFDM symbol comprised of N effective data samples and G guard intervals and recovers a FFT window position, the apparatus includes an analog-to-digital converter (ADC) (210) for converting a received OFDM signal into a digital complex sample, a symbol start detector (220) for quantizing a phase difference between the adjacent digital complex samples output by the ADC and detecting a position having a maximum correlation value with respect to the quantized values, as a symbol starting position, and a FFT window controller (230) for activating FFT using symbol start information detected by the symbol start detector. The influence of a frequency offset is reduced by using the phase difference between adjacent samples, thus improving the reliability of a system. Also, bit operation can be performed by using 3-bit quantization, thus simplifying the system.