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Quadrature frequency division complex digita receiver

An orthogonal frequency division, digital receiving technology, applied in orthogonal multiplexing systems, multiplexing communications, electrical components, etc., can solve problems such as flexibility limitations, achieve high flexibility and strong anti-interference ability , the effect of strong scalability

Inactive Publication Date: 2005-01-12
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0003] Since the existing OFDM receiving equipment mostly adopts commercial chipsets of specific standards, the flexibility is greatly limited
Moreover, a key issue in its design is how to achieve digital reception and fast synchronization of OFDM signals, reduce circuit costs and improve reception performance at the same time, which is also a difficult point in receiver design

Method used

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  • Quadrature frequency division complex digita receiver
  • Quadrature frequency division complex digita receiver
  • Quadrature frequency division complex digita receiver

Examples

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Embodiment Construction

[0061] The embodiment takes IEEE802.11a as the receiving signal, and describes its characteristics and implementation in detail.

[0062] According to one aspect of the present invention, a kind of OFDM digital receiving device is provided (referring to appended figure 1 ), the device includes a band-pass filter for filtering signals outside the spectrum range; an analog / digital converter for intermediate frequency sampling of the band-pass filtered signal; a digital down-conversion and decimator, It is used to convert the intermediate frequency sampling data into baseband signals; a frame synchronization and frequency offset estimator is used to locate the OFDM frame header and extract the rough estimation value of frequency offset; two forward frequency offset correctors, the first frequency offset corrector The offset corrector is used to correct the phase deflection; the second frequency offset corrector is used to correct the residual part of the phase deflection; a seria...

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Abstract

The receiving set includes following parts: A / D converter of sampling in mid frequency converts received OFDM signal to OFDM data stream through bandpass sampling method; digit down-conversion and decimator carried out digit down-conversion processing for OFDM data stream and extracts up character rate; frame synchronization and frequency bias estimator picks up frame start location and frequency shift value through specified synchronization method; first frequency bias rectification device in froward direction adjusts phase of OFDM data; Fast Fourier Transform (FFT) device carries out FFT and outputs symbols of carrier waves; compensator and phase estimator compensates channel distortion and coarse value of frequency bias as well as detects increment of phase error of data symbol; second frequency bias rectification device adjusts phase symbol drift symbol of sub carrier wave.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a digital receiving device used in an Orthogonal Frequency Division Multiplexing (OFDM) communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a high-efficiency broadband multi-carrier transmission technology, which has high frequency band utilization and excellent anti-multipath ability, and is suitable for high-speed data transmission. At present, OFDM technology has been widely used in different communication systems, such as the European digital television broadcasting standard DVB-T, the wireless local area network standard IEEE 802.11a and HiperLAN2, the wireless metropolitan area network standard IEEE 802.16a, etc. [0003] Because most of the existing OFDM receiving equipment adopts commercial chipsets of specific standards, the flexibility is greatly limited. Moreover, a key issue in its design is how to ac...

Claims

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Application Information

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IPC IPC(8): H04B1/16H04J11/00
Inventor 倪祖耀陆建华裴玉奎
Owner TSINGHUA UNIV
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