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weighted l p Related Synchronization Methods

A correlation coefficient and algorithm technology, applied in the field of communication and satellite navigation, can solve the problems of destroying the correlation characteristics of the original sequence, aggravating multipath effects, high side lobes, etc.

Active Publication Date: 2020-03-20
FUDAN UNIV
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Problems solved by technology

[0006] On the other hand, due to the reflection of obstacles, multipath components will inevitably be introduced into the received signal, and in indoor environments, due to the limited space, the multipath effect will be further aggravated
The multipath effect will destroy the correlation characteristics of the original sequence and produce extremely high side lobes, which seriously affects the traditional l 2 Synchronization Performance of Correlation Algorithms

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  • weighted l <sub>p</sub> Related Synchronization Methods
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[0073] The present invention is further described below through simulation experiments. Among them, the number of signal subcarriers of the OFDM system is 64, and the length of the cyclic prefix / suffix is ​​N g =16, the training sequence is ZC sequence [5], and the contrast algorithm adopted is l pCorrelation algorithm and NP synchronization algorithm [5] (p=1 or 2); the binary code of CDMA system is Kasami small set sequence [16], and the sequence length is 63, and the comparison algorithm adopted is l p related algorithms. The pseudo-random code in the satellite navigation system has the same effect as the binary code in the CDMA system, so no additional simulation analysis is done here.

[0074] The delay spread of the channel in the simulation is P=6, and the channel multipath fading |h|=[1,e -1 ,e -2 ,e -3 ,0.9,e -4 ] T , simulated in Gaussian noise and heavy-tailed noise environments, respectively. The probability density equation of heavy-tailed noise is charact...

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Abstract

The invention belongs to the technical field of communication and satellite navigation, and in particular relates to a weighted lp correlation synchronization method (p=1 or 2). According to the method, a special weight function is used, and lp correlation coefficients are weighted to effectively suppress the influence of a multipath effect on a traditional lp correlation synchronization algorithm. The analysis shows that the weight function used in the invention has the effect of time domain filtering and can filter out pseudo-peak generated by the multipath effect. In particular, when p is equal to 1, the algorithm provided by the invention has strong robustness to heavy tail distribution noise. A simulation result shows the correctness and validity of theoretical analysis, and shows that in orthogonal frequency division multiplexing (OFDM) and code division multiplexing (CDMA) systems, the method has higher synchronization accuracy and performance than the existing algorithms.

Description

technical field [0001] The invention belongs to the technical field of communication and satellite navigation, in particular to a weighted l p related synchronization algorithms. Background technique [0002] With the development of the communication industry, people's demand for transmission bandwidth is increasingly tight. However, in the traditional single-carrier modulation, the reduction of the bandwidth will lead to a proportional decrease of the system capacity, which cannot meet the needs of the modern communication industry. In order to solve this contradiction, more and more multiplexing technologies have been developed, among which Orthogonal Frequency Division Multiplexing (OFDM) and Code Division Multiple Access (CDMA) are due to their spectrum utilization It has been widely used because of its high performance and large system capacity. In order to ensure the accuracy of demodulation and reduce the bit error rate, a special sequence is often set in the commu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J13/00
CPCH04J13/00H04J2013/0096H04L27/2655
Inventor 李舟帆李旦张建秋
Owner FUDAN UNIV
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