Receiver architecture for pilot based OFDM systems

Details Receiver architecture for pilot based OFDM systems Receiver architecture for pilot based OFDM systems

2003-11-14

2008-11-18

Levitan, Dmitry (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Reexamination Certificate

active

07453792

ABSTRACT:
The invention relates to a novel methodology and apparatus for clock-offset compensation and common-phase offset correction in Frequency Division Multiplexing based wireless local area network (WLAN) environment, such as an Orthogonal Frequency Division Multiplexing (OFDM) environment. A curve fit, such as a threshold-based, least mean squares (LMS) fit of phase of the pilot sub-carriers in each OFDM symbol is used to estimate and counteract the rotation of the data sub-carriers due to residual frequency offset, low frequency phase noise, and clock offset. The invention is particularly well suited to wireless channels with multipath where pilots typically undergo frequency-selective fading. The thresholding LMS is implemented in a hardware-efficient manner, offering cost advantages over a weighted-LMS alternative. Additionally, the invention uses a unique phase-feedback architecture to eliminate the effects of phase wrapping, and avoid the need to refine channel estimates during packet reception.

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Abhayawardhana, V.S., and Wassell, I.J., “Residual Frequency Offset Correction for Coherently Modulated OFDM Systems in Wireless Communication,” IEEE Vehicular Technology Conference (VTC), No. 2, Spring 2002, May 2002, pp. 777-781.
Abhayawardhana, V.S., and Wassell, I.J., “Common Phase Error Correction with Feedback for OFDM in Wireless Communication,” GLOBECOM 2002—IEEE Global Telecommunications Conference, No. 1, Nov. 2002, pp. 660-664.

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