Method and device for synchronizing blocks and frames
A frame synchronization and block synchronization technology, applied in the field of communication, can solve the problems of high bit error rate of received data, affecting system performance, and inability to achieve synchronization.
Inactive Publication Date: 2011-01-05
HUAWEI TECH CO LTD
View PDF0 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the inventors of the present invention have found that when the interference in the channel is strong, the bit error rate of the received data is high, so the probability of synchronization head error is also very high, making it impossible to complete synchronization accurately or even to achieve synchronization
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.
[0045] The first embodiment of the present invention relates to a block synchronization method. The block synchronization header of each block in the received data stream is 2 bits, and the preset block synchronization header is "10" or "01". Wherein, the length of the block is L bits, for example, the length of the block is 66 bits (that is, L=66), and L counters are set correspondingly in the system, that is, 66 counters are set. When block synchronization is performed, a bit group with a length of L bits is used to detect data streams of N bit groups, wherein the L counters correspond to a possible block synchronization head position in a bit group. The specific flow of the block synchronization method is as follows: figure 2 shown....
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the communication field, discloses a method and device for synchronizing blocks and frames, and can accurately finish synchronization under higher input error rate. In the invention, N numbered bit fields are detected, the appearance times of bit fragments with the same synchronization headers with blocks at each position in each bit field are calculated, and if only the calculation value of one position is larger than a first threshold, the position is the position of the block synchronization header. A receiving sequence formed by M numbered block synchronization headers are subjected to (M-1) numbered cyclic replacements so as to obtain various possible cyclic replacement results of the receiving sequence, related operation is carried out on the cyclic replacement results and a reference sequence, a related value can quantitively indicate the approximation degree of the various cyclic replacement results to the reference sequence, and the result which cyclic replacement result is most approximate to the reference sequence can be obtained reliably by performing addition operation on related values corresponding to the same cyclic replacement times in theK numbered bit fields, thus accurately determining the position of a frame header.
Description
technical field [0001] The invention relates to the communication field, in particular to block and frame synchronization technology. Background technique [0002] Ethernet Passive Optical Network ("EPON" for short) access technology is a relatively good access technology, and its main advantages are simple maintenance, low cost, high transmission bandwidth and high cost performance. [0003] However, since EPON is a technology that uses passive optical transmission, components with amplification and relay functions are not used in this network. Therefore, the transmission distance and the number of branches of the EPON network depend on the power budget and various transmission losses. As the transmission distance or the number of branches increases, the Signal Noise Ratio (Signal Noise Ratio, “SNR” for short) of the transmitted data decreases gradually, and the bit error rate of the transmitted data increases gradually. In order to solve this problem, a Forward Error Cor...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 梁伟光耿东玉封东宁
Owner HUAWEI TECH CO LTD