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


Vol. 29,  No. 7, pp. 794-806, Jul.  2004


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  Abstract

This paper deals with correction of frequency offset and analysis of quantization angle noise in the IEEE 802.lla 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 offset. During the estimation and correction of the frequency offsets, 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.lla properly. Finally, the quantization errors are evaluated through simulations on number of quantization bits and SNR of received signals.

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  Cite this article

[IEEE Style]

J. K. Hwang, "Design of a Frequency Offset Corrector and Analysis of Noises due to Quantization Angle in OFDM LAN Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 7, pp. 794-806, 2004. DOI: .

[ACM Style]

Jin Kwon Hwang. 2004. Design of a Frequency Offset Corrector and Analysis of Noises due to Quantization Angle in OFDM LAN Systems. The Journal of Korean Institute of Communications and Information Sciences, 29, 7, (2004), 794-806. DOI: .

[KICS Style]

Jin Kwon Hwang, "Design of a Frequency Offset Corrector and Analysis of Noises due to Quantization Angle in OFDM LAN Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 7, pp. 794-806, 7. 2004.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880