Joint iterative carrier synchronization and demodulation method of SCCPM system

A carrier synchronization and joint iteration technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve problems such as systems that cannot track carrier frequency offset, achieve the effect of reducing sensitivity and improving tracking range

CN107995138AActive Publication Date: 2018-05-04NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-05-04

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Abstract

The invention provides a joint iterative carrier synchronization and demodulation method of an SCCPM system. The method comprises coded modulation, up-conversion, channel noise, down-conversion, carrier synchronization initialization, and joint iterative carrier synchronization and demodulation. The device involved in the invention comprises an SCCPM coded modulation module, an up-conversion module, a down-conversion module, a carrier synchronization initialization module and a joint iterative carrier synchronization and demodulation module. By adoption of the joint iterative carrier synchronization and demodulation method provided by the invention, the disadvantages of separate operation of carrier synchronization and demodulation in the traditional EM technology are overcome, the sensitivity of a logarithm posterior probability to carrier parameters is reduced, and the carrier tracking range is greatly improved; and meanwhile, the disadvantages of failure to track systems containingcarrier frequency offset in the prior art are also overcome, and systems containing carrier frequency offset and carrier phase offset can be tracked at the same time.
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Description

technical field

[0001] The invention belongs to the technical field of wireless communication, and relates to a joint iterative carrier synchronization and demodulation method for SCCPM systems in carrier synchronization technology and code modulation technology. Background technique

[0002] Continuous phase modulation (Continuous Phase Modulation, CPM) technology is a constant envelope modulation technology, which has the characteristics of high power utilization rate and high frequency band utilization rate at the same time. The excellent characteristics of CPM have attracted extensive attention and research in the fields of 2G communication, deep space communication, and military communication. In order to further improve the characteristics of efficient power utilization of CPM, a convolutional code module can be serially concatenated with a CPM modulator module through a bit interleaver to form a serially concatenated continuous phase modulation (Serially Concatenated ...

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0048] The invention can be applied in the fields of telemetry communication, satellite communication, military communication, etc., realizes carrier synchronization by means of a second-order PLL structure, and realizes data demodulation by means of an iterative demodulation algorithm in an SCCPM system, thereby ensuring the reliability of communication.

[0049] The idea of ​​the method of the present invention is: firstly use the carrier synchronization initialization module to obtain the initial carrier estimation information and the CPM bit logarithmic input probability for iteration, and then use the joint iteration carrier synchronization and demodulation module to perform carrier tracking and iterative demodulation to achieve accurate Carrier synchronization and reli...