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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.

Inactive Publication Date: 2006-12-20
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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Problems solved by technology

[0006] In order to solve the technical problem of estimating the performance of the phase deviation curve in an OFDM system under a multipath channel, the present invention uses the pilot sub-channel amplitude gain or signal-to-noise ratio as the weight, and adopts the weighted least square method and its simplified algorithm to improve The estimation accuracy of the phase deviation curve can greatly improve the curve fitting accuracy, reduce the amount of calculation, improve the sampling frequency offset and carrier frequency offset correction accuracy, thereby improving the overall performance of the receiver

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

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Embodiment Construction

[0033] Based on the implementation example of the present invention, the receiver subcarrier phase deviation estimation and compensation in the wireless local area network of the application IEEE 802.11a protocol, refer to the attached Figure 5 , with Figure 6 , giving specific implementation steps. Which attached Figure 5 The units in the Figure 6 Detailed description of modules (16)(17)(18) in .

[0034] 1. The receiver performs carrier frequency offset estimation, clock synchronization and channel estimation work after receiving the preamble (Preamble), which we call Preamble processing (11), and transmits the frequency offset result to the frequency offset correction unit (12), and Pass the channel estimation coefficients to the equalizer (15) to trigger the FFT window controller (13) to work.

[0035] 2. The OFDM symbol received each time by the receiver passes through the FFT module (14) and the equalizer module (15) after removing the CP part therein through the...

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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.

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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Application Information

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IPC IPC(8): H04L27/26
Inventor 滕炜亮
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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