Digital modulation method and apparatus, demodulation method and apparatus, and system

Abstract

The embodiment of the invention discloses a digital modulation method. The method comprises: coding processing is carried out on original data to obtain a bit sequence; the bit sequence is divided into M to-be-modulated bit groups, wherein each to-be-modulated bit group includes N bits; according to a preset constellation map, constellation mapping is carried out on the M to-be-modulated bit groups to obtain M constellation points; phases of the M constellation points are obtained, wherein the phases of the M constellation points include: phi1, phi2, ..., phiM; the phases of the M constellation points I are adjusted; to be specific, the phi1 is adjusted to be phi0+phi1, the phi2 is adjusted to be phi0+phi1+phi2, ..., and the phiM is adjusted to be phi0+phi1+phi2+phi3+...+phiM, wherein the phi0 is 0 or the phi0 is the phase of a previous symbol before the constellation point with the phase of phi1; and the M constellation points after phase adjustment are modulated to obtain an N-order modulation signal. In addition, the embodiment of the invention also discloses a digital demodulation method and apparatus, and a system. Therefore, the phase noise interference can be reduced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a digital modulation method, a demodulation method, a related device and a system. Background technique [0002] In a nonlinear channel, the envelope fluctuation of the modulation method used is required to be small. In order to improve the utilization rate of the spectrum bandwidth, the signal transmission generally adopts a high-order modulation method combining amplitude and phase. When the frequency of the carrier and the modulation order are high, the modulation mode is greatly affected by the phase noise. [0003] For example, in the IEEE 802.11ad communication protocol, the frequency band of the carrier works at 60GHz. The IEEE802.11ad communication protocol defines SC PHY (Single Carrier Physics, SC PHY for short) and OFDM PHY (Orthogonal Frequency Division Multiplexing Physics, Orthogonal frequency division multiplexing physical layer, referred to as OFDM PHY), wherein...

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Problems solved by technology

[0005] It can be seen that in the case of only AWGN interference, the BER (Bit Error Rate, BER for short) after 64QAM decoding decreases rapidly as the SNR (Signal Noise Ratio, SNR for short) increases; In the case of PN interference, the linear PNC algorithm commonly used in the industry is used for processing. Even if the SNR exceeds 23dB, the BER remains at 10 after decoding. -3 Left and right, basically unable to meet normal data transmission

Therefore, the existing phase noise suppression algorithm cannot effectively solve the impact on the bit error rate

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