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High-efficiency pilot communication system, waveform generation method thereof and waveform tracking method thereof

A communication system and waveform technology, applied in pilot signal distribution, transmission system, digital transmission system, etc., can solve the problems of discrimination function zero-crossing offset, code tracking loop tracking error, correlation function distortion, etc., and achieve anti-multipath The effect of performance improvement

Active Publication Date: 2018-03-13
ZHEJIANG UNIV
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Problems solved by technology

When there is multi-path interference in the environment, the multi-path signal component will distort the correlation function, causing the zero-crossing point of the discrimination function to shift, resulting in an additional tracking error in the code tracking loop

Method used

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  • High-efficiency pilot communication system, waveform generation method thereof and waveform tracking method thereof
  • High-efficiency pilot communication system, waveform generation method thereof and waveform tracking method thereof
  • High-efficiency pilot communication system, waveform generation method thereof and waveform tracking method thereof

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Embodiment

[0061] Taking two spreading sequences as an example, the high-frequency clock is 6.138MHz, and the frequency divider multiples are 5 and 4 respectively, that is, the spreading code rates are 1.228MHz and 1.534MHz respectively, and the periods of the two spreading codes are both 1ms. In this example, the PN sequence is directly added and output.

[0062] A method for generating waveforms with variable structure comprises the following steps:

[0063] (1) 6.138MHZ high-frequency clock 101 generates 2 low-frequency clocks after frequency divider 102, which are respectively R 1 = 1.228MHz and R 2 = 1.534MHz;

[0064] (2) The frequency-divided clock signal is input to the sequence generator, here a gold sequence with a length of 2047 is used. In order to ensure the same period of the spreading sequence, the two sequences are truncated so that their lengths are 1228 and 1534 respectively.

[0065] (3) Multiply the data and the truncated code of the gold sequence to obtain the mo...

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Abstract

The invention discloses a high-efficiency pilot communication system, a waveform generation method thereof and a waveform tracking method thereof. The system comprises a waveform generation system anda waveform tracking system. When a waveform is generated, PN sequences with different rates and the same period, and binary orthogonal subcarriers need to be generated; the PN sequences and the subcarriers are multiplied and added; and one PN sequence is used for transmitting data, and the rest PN sequences are taken as pilot information. When signals are received, a receiving end calculates codetracking errors of the PN sequences and subcarrier tracking errors through adoption of a plurality of estimators, and a combiner fuses the tracking errors of the PN sequences and the subcarriers andcalculates relatively precise tracking errors. According to the system and the method, an equivalent code rate obtained through synthesis of a plurality of sequences is consistent with a high frequency clock, the magnitude the same as that of a spread spectrum sequence of which rate is the high frequency clock can be achieved on the code tracking precision, waveform generation modes are flexible and variable, and bandwidths occupied by the signals is relatively low.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a high-efficiency pilot communication system and a waveform generation and tracking method thereof. Background technique [0002] With the rapid development of ground and air autonomous unmanned systems, the demand for information networks is becoming more and more comprehensive, especially the integrated design of communication, navigation and positioning has become a hot issue in the field of future information networks. [0003] The research on the integration of communication and navigation involves the field of space-based communication and satellite navigation, so it is necessary to study the relationship between the signal processing system of space-based communication and the signal processing system of satellite navigation. However, for such a long time in the past, the research and processing of traditional space-based communication and navigation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/00H04J13/10H04L5/00
CPCH04J13/0022H04J13/10H04L5/0048
Inventor 许笑笑李立言赵民建范程飞
Owner ZHEJIANG UNIV
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