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Sample clock frequency deviation compensation method and device for OFDM receiver

A technology of sampling clock and frequency deviation, applied in the direction of multi-frequency code system, etc., can solve the problems of large storage capacity, insufficient anti-noise performance, poor performance, etc., and achieve the effect of eliminating noise

Inactive Publication Date: 2006-04-12
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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Problems solved by technology

However, the performance of this method is not good at low signal-to-noise ratio, and the phase rotation estimation of each subcarrier is not accurate enough.
[0010] In the patent application 00802091.4, Kim Hye-jung and Li Xiankui provided a method for accumulating and calculating the estimated offset of the slope in the formulas (10) and (11) of the specification, but this method needs to know the offset of an even number of windows in advance The value of , the storage capacity is large and the calculation is complex, and the anti-noise performance is still not good enough

Method used

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  • Sample clock frequency deviation compensation method and device for OFDM receiver
  • Sample clock frequency deviation compensation method and device for OFDM receiver
  • Sample clock frequency deviation compensation method and device for OFDM receiver

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Embodiment Construction

[0051] Based on the implementation example of the present invention, apply the receiver clock frequency deviation compensation in the wireless local area network of IEEE 802.11a agreement, with reference to accompanying drawing, provide concrete implementation steps:

[0052] 1. After receiving the pilot signal (Preamble), the receiver performs carrier frequency synchronization, clock synchronization and channel estimation, and transmits the channel estimation coefficients to the equalizer, and triggers the FFT window controller to work.

[0053] 2. The OFDM symbol received by the receiver each time is intercepted by the FFT window controller, and the data part is passed through the FFT module and the equalizer module.

[0054] 3. attached Figure 9 shown as figure 1 The specific implementation block diagram of module (6) pilot frequency extraction and FFT window rough estimation. Obtain the pilot value of the -21st, -7, 7th and 21st channels in each sub-channel output afte...

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Abstract

A method for compensating frequency deviation of sampling clock on OFDM receiver includes using FFT window controller to control FFT window position for picking up pilot phase deviation angle in current OFDM symbol to derive out offset amount crude estimation of current FFT window, using accumulated average of FFT window offset amount to estimate FFT window offset amount of OFDM symbol accurately, using this accurate offset amount to regulate each sub channel phase after current OFDM symbol is balanced and simultaneously using this accurate offset amount to judge whether FFT window of next OFDM symbol is displaced or not.

Description

technical field [0001] A method and device for sampling clock frequency deviation compensation applied to an Orthogonal Frequency Division Multiplexing (OFDM) receiver. It belongs to the technical field of digital communication, and relates to a method and device for sampling clock frequency offset compensation in the field of Orthogonal Frequency Division Multiplexing (OFDM) communication, especially a class of adding preamble signals (Preamble) and adding pilot frequencies (Pilots) A sampling clock frequency deviation compensation method and device thereof in an OFDM communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a technology with superior performance in efficiently sending data on a channel, and this technology uses multiple subcarrier frequencies within a channel bandwidth to send data. At the same time, the OFDM system also has the characteristics of tolerance to multipath delay spread and frequency s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 滕炜亮
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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