16apsk Signal Carrier Phase Synchronization and Its Judgment and Locking Method
A carrier synchronization and signal carrier technology, applied in the field of satellite communications, can solve the problems of signal spectrum deviation, random phase error, etc., and achieve the effects of excellent performance, reduced complexity, and reduced number of
Active Publication Date: 2021-09-03
10TH RES INST OF CETC
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In the process of signal propagation, the rapid change of channel characteristics, the asynchronous clock of the receiving end and the clock of the sending end, and the Doppler frequency shift caused by motion all cause the signal spectrum received by the receiving end to deviate from the center point, so that The down-converted baseband signal produces a randomly changing frequency offset, and the signal will introduce random phase jitter during transmission, so that the baseband signal at the receiving end will inevitably have frequency offset and phase offset, resulting in random phase before signal demodulation error
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[0019] See figure 1 . According to the present invention, in the 16apsk carrier synchronization, the first hard decision module obtains a hard decision value of the demodulation of the constellation point according to the carrier synchronous output signal, and secondary clauses, according to the carrier synchronous output signal and the hard judgment of the consignment point. The angular difference, the phase error signal is extracted, and the phase error signal is smoothed through the loop filter, and then the oscillator NCO is pressed according to the output signal of the loop filter, and the joint decision module is output in the 16APSK carrier synchronization. The phase offset indication generates a corresponding phase compensation value, finally, the carrier synchronization input signal performs phase compensation based on the phase compensation value to obtain a carrier synchronous output signal.
[0020] In the 16apsk carrier synchronous judgment branch, first hard decision...
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The present invention proposes a 16APSK signal carrier phase synchronization and its locking method, aiming to provide a method capable of reducing the number of phase ambiguities of 16APSK and reducing the complexity of subsequent processing of a demodulator. The present invention is realized through the following technical solutions: in 16APSK carrier synchronization, first the hard decision module obtains the hard decision value of the demodulation constellation point according to the carrier synchronization output signal, and secondly, the phase detector obtains the hard decision value of the demodulation constellation point according to the carrier synchronization output signal and the demodulation constellation point The phase error signal is extracted from the angle difference between the hard decision values, and the phase error signal is smoothed and filtered through the loop filter, and then the voltage-controlled oscillator NCO is locked according to the output signal of the loop filter and the 16APSK carrier synchronously The phase offset indication output by the branch joint decision module generates a corresponding phase compensation value, and finally, the carrier synchronization input signal is phase compensated according to the phase compensation value to obtain a carrier synchronization output signal.
Description
Technical field [0001] The present invention relates to the field of satellite communication, in particular high-order modulated carrier synchronization methods in high-speed satellite communication, and more particularly to a carrier synchronization suitable for 16APSK and its judging method. Background technique [0002] With the continuous development of satellite communications, the satellite communication business continues to expand, and the demand for data volume needs to be increased, which makes a high-profile modulation method with high spectrum efficiency. Since the satellite channel is a typical nonlinear channel, the high-order modulation signal faces a more serious signal nonlinear distortion than low-order modulation. Traditional high-order QAM modulation (such as 16QAM) constellation is much larger, very sensitive to channel nonlinearity. 16apsk system is also called a star 16QAM, different from the general QAM signal, its constellation is composed of 2 circles in...
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IPC IPC(8): H04L27/38H04B7/185
Inventor 潘云强胡新士
Owner 10TH RES INST OF CETC