Method and apparatus for compensating sampling frequency offset and carrier frequency offset in OFDM system

A technology of carrier frequency offset and sampling frequency offset, applied in multi-frequency code systems and other directions, which can solve the problems of performance degradation of estimated phase deviation curve and reduction of calculation amount.
CN1881970AInactive Publication Date: 2006-12-20BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
Publication Date
2006-12-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for combined compensating the sampling frequency bias and the carrier wave frequency bias, used in the orthogonal frequency division multiplexing system, and a relative device, wherein based on the phase bias of pilot sub carrier wave, the invention uses the weight least square method and another two simplify methods to estimate the slope and intercept of phase bias curvature of sub carrier wave, whose weight is decided by the increment function or signal / noise ratio of pilot channel; compensates the phase bias of data sub carrier wave via the estimated phase bias curvature; and supports the accurate estimated value of FFT window drift based on the curvature slop, to adjust the position of FFT window by FFT window controller, to compensate the sampling frequency bias; then based on the curvature intercept, supports the estimated value of carrier wave frequency bias, to feedback and compensate the carrier wave frequency bias. The invention can improve the compensate accuracy of sampling frequency bias and carrier wave frequency bias under multi-path condition.
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Description

technical field

[0001] A method and device for compensating sampling frequency offset and carrier frequency offset applied in an Orthogonal Frequency Division Multiplexing (OFDM) receiver. It belongs to the technical field of digital communication, and relates to the estimation and compensation of sampling frequency deviation and carrier frequency deviation in the baseband demodulation of receivers in the Orthogonal Frequency Division Multiplexing (OFDM) communication mode. In particular, the invention relates to a method and device for compensating sampling frequency offset and carrier frequency offset in multi-path channel transmission in an OFDM communication system adding pilot signals (Pilots). Background technique

[0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a technology with superior performance in sending data efficiently on a channel, and this technology uses multiple subcarriers within a channel bandwidth to send data. At the same time,...

Claims

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