Polarity-interleaved binary offset pulse keying modulation and demodulation method

Abstract

The invention discloses a polarity-staggered binary offset pulse keying modulation and demodulation method, which comprises the following steps of: on the basis of a binary offset pulse keying modulation mode, performing pulse modulation of which the positive and negative polarities are staggered with those of a symbol '1' on a symbol '0' in an initial information modulation interval of each symbol period, so that all discrete line spectrums including carrier frequency can be greatly reduced or even completely eliminated, and the constellation point distance between symbols is greatly enlarged; and after a series of processing such as impact filtering-multiplication of coherent carrier-low-pass filtering or band-pass filtering is carried out on received signals, further performing final classification judgment on the received signals by using a deep learning (DL) algorithm based on a sparse auto-encoding (SAE) neural network, so that the received signal-to-noise ratio and the energy utilization rate are remarkably improved, and the noise suppression and anti-interference performance of the system is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency digital information transmission, and relates to a method for information modulation and demodulation in digital communication, in particular to a polarity interleaved binary offset pulse keying modulation and demodulation method. Background technique [0002] 1. Binary offset pulse keying modulation [0003] Considering the classic binary (binary) amplitude shift keying (2ASK), frequency shift keying (2FSK) and phase shift keying (2PSK, also denoted as BPSK) and other binary shift keying (BSK: Binary Shift Keying) spectrum utilization is very low, and the keying period of this type of traditional modulation is its symbol period , lacks the necessary guard interval to deal with multipath channel and intersymbol interference, so we extend it to In the situation, first obtain an "Extended Binary Phase Shift Keying" (EBPSK: Extended BPSK) modulation (see "Unified Binary Phase Modulation...

AI Technical Summary

Problems solved by technology

[0013] However, unipolar ABSK pulse modulation still has obvious deficiencies, which are mainly manifested in: firstly, there are a lot of high discrete line spectra in its spectrum, although it does not carry modulation information and affect demodulation performance, it is obviously not conducive to Spectrum efficiency is improved, and if no protection measures are taken, it will cause serious energy leakage to interfere with adjacent channel signals; in addition, whether it is spectrum analysis shows that its higher carrier component occupies part of the transmit power, or from (3) formula Considering the unipolar characteristics shown, its demodulation must depend on a certain preset threshold related to the actual receiver input signal amplitude, which makes unipolar ABSK pulse modulation sensitive to channel characteristic changes, and its performance is not excellent enough.