Joint iterative carrier synchronization and demodulation method of SCCPM system

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.

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 ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the first-order PLL structure is only regarded as a smooth filter for carrier phase noise, and it can only track the system with carrier phase offset, but cannot track the system with carrier frequency offset.

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