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Frame synchronization method

A technology of frame synchronization and frame synchronization sequence, which is applied in the communication between multiple stations, transmission systems, electrical components, etc., can solve the problems of large hardware resource consumption and low utilization rate, and achieve saving and improving hardware resources. The effect of utilization

Active Publication Date: 2009-11-11
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this search method needs to implement multiple sliding correlators, and only one correlator needs to be reserved for frame synchronization after the carrier frequency deviation is estimated and compensated, resulting in large hardware resource consumption and low utilization

Method used

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Embodiment 1

[0069] Suppose the m-sequence with a length of 63 is used as the frame synchronization sequence, and its generating polynomial is p(z)=z 6 +z 5 +1. At the same time, it is assumed that the signal-to-noise ratio in the channel is 20dB. In the absence of carrier frequency deviation, figure 2 The cross-correlation curve of the frame synchronization module shown near the frame start position is shown as Figure 5 shown; in the existence of size f band In the case of a carrier frequency deviation of / 64, the figure 2 The cross-correlation curve of the frame synchronization module shown near the frame start position is shown as Figure 6 shown.

[0070] Compare Figure 5 and Figure 6 From the peak value of the cross-correlation curve in , it can be seen that compared with the case where there is no carrier frequency deviation, in the presence of f band In the case of a carrier frequency deviation of / 64, accurate frame synchronization cannot be achieved by existing cross...

Embodiment 2

[0072] Following Example 1, let θ max For π / 2, there are:

[0073]

[0074]

[0075] Let L b =L max =16, then the number of segments The subsequence lengths of the four segments are 16, 16, 16 and 15, respectively. Segmented cross-correlation will reduce the cross-correlation value, but setting the initial state of the m-sequence reasonably can make this effect almost negligible. In this example, let each subsequence be

[0076] the s t_1 = {1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1}, s t_2 ={1,1,1,-1,1,-1,-1,-1,1,1,1,-1,-1,1,-1,-1},

[0077] the s t_3 = {1, -1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1}, s t_4 = {1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}.

[0078] In the absence of carrier frequency deviation, Figure 4 The cross-correlation curve of the frame synchronization module shown near the frame start position is shown as Figure 8 shown; there exists a size f band In the case of a carrier frequency deviation of / 64, th...

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Abstract

The invention belongs to the technical field of digital communication, and in particular relates to a frame synchronization method adopting cross-correlation operation. The frame synchronization method based on sectional cross-correlation provided by the invention increases several arithmetic units used for solving squares of signal modulus; when large carrier frequency deviation exists, a path of correlator is only needed as usual, and a plurality paths of cross-correlators are not needed for the cross-correlation operation on different frequency points; and moreover, after completion of the estimation and compensation on the carrier frequency deviation, the method still can utilize the same arithmetic units for frame synchronization, and accurately estimate a frame start position. Therefore, the sectional cross-correlation method provided by the invention greatly saves the consumption of hardware resources, and improves the utilization rate of the hardware resources.

Description

Technical field: [0001] The invention belongs to the technical field of digital communication, and in particular relates to a frame synchronization method using cross-correlation calculation. The method can still accurately estimate the frame start position in the case of a large carrier frequency deviation in a received signal. Background technique: [0002] In a burst communication system, since the receiving end cannot accurately predict the transmission time of each physical layer frame, it is necessary to use part of the information in the received signal to estimate the start time of the received physical layer frame. Most communication systems adopt a correlation method to perform cross-correlation or auto-correlation on a specific sequence in the received signal, and determine the starting moment of the physical layer frame according to the position of the correlation peak. For example, in IEEE 802.11 (Wireless Local Area Network, WLAN), the short training symbols in...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L29/06
Inventor 吴毅凌赵玉萍李红滨
Owner PEKING UNIV
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