Coherent demodulation method based on precoding MSK waveform
A coherent demodulation and precoding technology, applied in the modulation carrier system, digital transmission system, electrical components, etc., can solve the problems of demodulation performance loss, phase-locked loop loss of lock, high threshold complexity, etc., to avoid performance loss, Avoid the effect of demodulation failure
Pending Publication Date: 2022-01-04
成都中科微信息技术研究院有限公司
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[0005] The purpose of the present invention is to provide a coherent demodulation method based on precoded MSK waveform to solve the phase problem that the coherent demodulation algorithm in the prior art usually uses a phase-locked loop to solve the phase problem, but the data phase changes too fast will cause the phase-locked loop to lose lock, and the use of decision processing to recover data, but there is a loss of demodulation performance during decision processing, and the selection of the threshold also has a problem of high complexity
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[0040] Such as figure 1 As shown, this embodiment proposes a coherent demodulation method based on precoded MSK waveforms, including the following steps:
[0041] S1, performing a CRC check on the bit stream data at the transmitter; wherein the polynomial for the CRC check is Z^16+Z^15+Z^2+1;
[0042] S2, performing channel coding (Reed-Solomon coding) on the bit stream data after the CRC check, to obtain the bit stream data bit_data after channel coding;
[0043] S3. Pre-encode the channel-coded bit stream data bit_data to obtain the pre-encoded bit stream data:
[0044] S31, zero padding before and after the bit stream data bit_data after channel encoding (adding a bit zero, that is, 0bit data) to obtain zero padding data data_add0;
[0045] S32. Pre-encode the zero-filled data data_add0. The pre-encoding processing method is as follows:
[0046] y=x(n)+x(n+1),n=1,2,...,N
[0047]
[0048]Among them, x is the data to be precoded, that is, the data add_bit_data after...
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The invention provides a coherent demodulation method based on a precoding MSK waveform, and specifically, precoding processing is added in bit-level processing at a sending end, phase rotation with 90-degree phase difference needs to be carried out on adjacent symbol data when coherent demodulation is carried out at a receiving end, an optimal sampling point is calculated through a synchronized position, and the data is recovered. The coherent demodulation method provided by the invention does not have judgment processing, so that the performance loss caused by judgment is avoided; in addition, local carrier in-phase is not needed during down-conversion processing in the coherent demodulation method, only carrier in-frequency needs to be generated, decoding and CRC check are carried out by using different demodulation polarity data to solve the problem of polarity reversal caused by an initial phase, a phase-locked loop is not used in the system, Therefore, the problem of demodulation failure caused by lock losing of the phase-locked loop in the prior art is avoided.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a coherent demodulation method based on precoded MSK waveform. Background technique [0002] In some special wireless communication environments, special attention is paid to the power consumption index of communication equipment, hoping to improve the utilization efficiency of the power amplifier, and then the utilization efficiency of the power amplifier is related to the amplitude change of the waveform, and the modulation waveform with a constant envelope has the highest utilization rate of the power amplifier, so In a special wireless communication environment, a modulation waveform with a constant envelope is often selected. [0003] MSK (Minimum Shift Keying, minimum frequency shift keying) is a constant envelope modulation method, and its phase of the waveform is continuous, the side lobe attenuation is fast, the energy is concentrated, and the adja...
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IPC IPC(8): H04L27/148
CPCH04L27/148Y02D30/70
Inventor 卜智勇薛顺瑞陈勇强蒋小敏常蓉
Owner 成都中科微信息技术研究院有限公司