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Method and apparatus for diversity receiving OFDM signal by time domain oversampling

A time-domain signal and diversity receiving technology, applied in multi-frequency code systems and other directions, can solve problems such as performance degradation of communication systems, and achieve the effects of increasing computational complexity, reducing overall impact, and improving system performance.

Inactive Publication Date: 2007-01-31
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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AI Technical Summary

Problems solved by technology

[0004] Noise introduced at the radio frequency degrades the performance of the communication system

Method used

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  • Method and apparatus for diversity receiving OFDM signal by time domain oversampling
  • Method and apparatus for diversity receiving OFDM signal by time domain oversampling
  • Method and apparatus for diversity receiving OFDM signal by time domain oversampling

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Embodiment Construction

[0027] Based on the implementation example of the present invention, it is applied to the OFDM receiver of the wireless local area network IEEE 802.11a protocol standard. Refer to attached image 3 , with Figure 4 , giving specific implementation steps. Which attached Figure 4 to attach image 3 A detailed description of the unit module (40) in .

[0028] The AD sampler (10) of the OFDM receiver oversamples at a sampling rate of 50Msps.

[0029] Pass the oversampled data through the interpolator module (20) to obtain a sampling rate of 40 Mbps, so the oversampling multiple is 2.

[0030] A bit synchronization and FFT window adjustment unit module (30) is used to synchronize the frame preamble sequence Short Preamble and Long Preamble, simultaneously perform frequency offset estimation and correction, and obtain the FFT window position.

[0031] The cyclic prefix is ​​removed by the FFT window, and the sampled data stream of 40Mbps intercepted is divided into two parall...

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Abstract

The invention provides a diversity receiving method and device for an OFDM receiver, where the method firstly oversamples OFDM signals in time domain and resamples time-domain signals through interpolation by integral times of sampling frequency of transmitted signals; after completing synchronous regulation, divides the signals into multiple signals to pass through FFT modules and makes corresponding subcarrier wave phase correction on the output of each FFT module; then, merges all signals and makes follow-up balanced decoding and other processing. By oversampling of time-domain signals and increasing partial operational complexity, the method obtains diversity gain of the OFDM system, reducing the noise effect on the system and improving the whole performance of the OFDM receiver.

Description

technical field [0001] A method and device for receiving OFDM signals through time-domain oversampling diversity. It belongs to the technical field of digital communication and relates to the technology of receiver demodulator design in Orthogonal Frequency Division Multiplexing (OFDM) communication system. 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. Compared with frequency division multiplexing (FDM), in order to avoid interference between carriers, the latter needs to separate subcarriers, thus wasting a part of frequency resources. However, although the sub-carriers of the OFDM system may overlap with each other, the information that has been modulated on each sub-carrier can still be distinguished and recovered at the receiving end. At the same time, the ...

Claims

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Application Information

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