OFDM blind synchronizing method based on phase information and real part detection

A technology of phase information and real part, which is applied in the field of demodulation technology of communication systems, can solve problems such as peaking and peak sharpness affecting the accuracy and stability of judgment, affecting the accuracy of synchronization estimation, and affecting the accuracy of carrier frequency. Achieve the effect of improving peak sharpness, peak formation and accuracy

Inactive Publication Date: 2007-08-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

When this method is greatly affected by noise, the peak point will deviate from the synchronization point, which will affect the accuracy of synchronization estimation.
At the same time, the limited peaking and peak sharpness seriously affect the accuracy and stability of the judgment, which also affects the accuracy of the carrier frequency deviation estimation

Method used

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  • OFDM blind synchronizing method based on phase information and real part detection
  • OFDM blind synchronizing method based on phase information and real part detection
  • OFDM blind synchronizing method based on phase information and real part detection

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] As shown in Figure 2, when the signal r(t) received by the receiver in the OFDM system is converted into a digital signal r(n) by an analog / digital (A / D) converter, the blind synchronization process of the present invention is started, where The sample rate is the sample rate when the sender sends.

[0034] The OFDM blind synchronization process based on phase information and real part detection is as follows:

[0035] Step 201, for the signal r(n)=R after A / D conversion n exp(jβ n ) amplitude information R n Masking, the new signal obtained is only related to the phase information of the received signal, but has nothing to do with its amplitude, and only depends on the phase information β n Realize the synchronization function. The signal after masking the amplitude information is r ~ ( n...

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Abstract

An OFDM blind synchronous method based on phase information and real part detection includes varying received multidigital signal amplitude to be a constant value , or picking up original signal phase information only , correlating received signal only with original signal phase information , carrying out sliding correlation operation for correlated signal , carrying out only real part detection on sliding correlation result , using time corresponding to peak value as synchronous time when peak value is detected and then utilizing signal sample value of this synchronous time to finalize estimation of frequency deviation .

Description

technical field [0001] The invention relates to the communication field, in particular to the demodulation technology of the communication system. Background technique [0002] At present, with the rapid growth of demand for new communication services, higher requirements are placed on the transmission rate of wireless communication systems and wireless local area networks, and the increase in transmission rate brings inter-symbol interference (ISI) and The problem of deep frequency selective fading. At present, there are two ways to solve this problem, one is to use orthogonal frequency division multiplexing, that is, to disperse high-speed data to several sub-carriers for parallel transmission at a low rate; the other is to use a single carrier that simply introduces a cyclic prefix system. Both methods require cyclic prefix insertion and frequency domain equalization. Since both methods transmit signals in a symbol block structure, this requires not only sampling clock ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 卢策吾邝育军邱磊陈前斌李云隆克平
Owner CHONGQING UNIV OF POSTS & TELECOMM
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