Method for realizing OFDM system synchronization using circulating prefix

A technology of cyclic prefix and synchronization parameters, which is applied in the field of cyclic prefix synchronization of OFDM systems, and can solve the problems of occupied bandwidth, complex algorithm, poor accuracy, etc.

Inactive Publication Date: 2006-12-13
ZTE CORP
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Problems solved by technology

Although this method is simple and has good performance, because it occupies bandwidth, it generally only sends training symbols at the beginning of the frame (IEEE802.11a)
The second is to intersperse pilots between the transmitted OFDM symbols. Although this method solves the problem of bandwidth occupation by the above method, its accuracy is poor. Generally, it is combined with training symbols for adaptive tracking and synchronization.
The third method, also known as the blind synchronization method, does not send any known symbols, which saves the most bandwidth, but the algorithm is complex and the accuracy is not high

Method used

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  • Method for realizing OFDM system synchronization using circulating prefix
  • Method for realizing OFDM system synchronization using circulating prefix
  • Method for realizing OFDM system synchronization using circulating prefix

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Embodiment Construction

[0058] figure 1 Block diagram of OFDM implementation proposed for IEEE 802.11a. As shown in the figure, the OFDM system transmitter includes: source encoder 1, interleaving coder 2, QAM / QPSK / BPSK signal generator 3, pilot frequency embedding module 4, serial-to-parallel converter 5, IFFT 6, parallel-to-serial Converter 7, cyclic prefix adding and windowing module 8, digital-to-analog converter 9, radio frequency amplifier 10 and transmitting antenna 11, the input information is encoded, interleaved, QAM / QPSK / BPSK mapping, zero insertion, serial-to-parallel conversion, IFFT operation , parallel-to-serial conversion, adding a cyclic prefix, and adding a window to form a signal waveform, and then filtering, up-regulating the carrier wave and radio frequency amplification to send out from the transmitting antenna 11 . The receiving end of OFDM includes: receiving antenna 12, receiving signal amplifier 13, analog-to-digital converter 14, time offset frequency offset correction mod...

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Abstract

The invention discloses a synchronizing method of circulating prefix OFDM system, which comprises the following steps: step A. finding the circulating prefix with maximum energy; step B. rotating the OFDM symbol to the corresponding position of maximum energy circulating prefix; realizing synchronous parameter of coherent estimation at receiving end. The invention simplifies effective control for PAPR, which needn't larger calculating expenditure for sending and receiving ends.

Description

technical field [0001] The invention relates to an OFDM system synchronization method, in particular to a cyclic prefix synchronization method of the OFDM system. Background technique [0002] Orthogonal Frequency Diversity Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology has aroused great interest in the industry in recent years because of its good anti-fast fading channel performance and simple implementation. In IEEE 802.11 series and European DVB-T There are applications. However, the two biggest weaknesses of OFDM, sensitivity to frequency offset and large PAPR (ratio of peak power to average power), limit the application of this technology. [0003] OFDM synchronization includes time synchronization and frequency synchronization. Traditional OFDM synchronization techniques include three types in terms of bandwidth utilization: first, transmit training symbols at the sending end, and estimate frequency offset and time offset parameters at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 石苗
Owner ZTE CORP
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