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Design of a Frequency Offset Corrector and Analysis of Noises due to Quantization Angle in OFDM LAN Systems  

황진권 (우석대학교 전지전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.7A, 2004 , pp. 794-806 More about this Journal
Abstract
This paper deals with correction of frequency offset and analysis of quantization angle noise in the IEEE 802.1la OFDM system. The rotation phase per symbol due to the carrier frequency offset is estimated from auto-correlation of the short Preambles, which are over-sampled for the reduction of noise in OFDM signals. The pilot signals are introduced to estimate the rotation phase per OFDM symbol due to estimation error of the carrier frequency offset and the sampling frequency onset. During the estimation and correction of the frequency onsets, a CORDIC processor and a look-up table are used for the conversion between a rotation phase and its complex number. Being calculated by a limited number of bits in the CORDIC processor and the look-up table, the rotation phase and its complex number have quantization angle errors. The quantization errors are analyzed as SNR (signal to noise ratio) due to the quantization bit numbers. The minimum bit number is suggested to meet the specification of IEEE 802.1la properly. Finally, the quantization errors are evaluated through simulations on number of quantization bits and SNR of received signals.
Keywords
OFDM; frequency offset; rotation phase; quantization angle; CORDIC; look-up table; IEEE 802.1la LAN;
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