Zero-trailing extended DFT-based high spectral efficiency multiplexing communication method

Abstract

The invention provides a zero-trailing extended DFT-based high spectral efficiency multiplexing communication method which has the advantages of being low in complexity, effectively demodulating transmitted signals and improving performance by adjusting the length of a zero trail, and belongs to the technical field of information and communication. The method comprises a sending step and a receiving step, wherein the sending step comprises constructing a time-domain sending symbol vector with a zero trailing feature and sending the time-domain sending symbol vector; and the receiving step comprises: step B1: receiving a signal vector, adding K-N zeros at the end of the received signal vector, obtaining a time-domain receiving symbol sequence, and obtaining a frequency-domain receiving signal by performing K-point FFT on the time-domain receiving sequence; step B2: taking top-N data of the frequency-domain receiving signal for performing N-point DFT; and step B3: extracting data subcarrier data after the N-point DFT for zero-forcing detection so as to realize symbol demodulation, wherein alpha represents a spectrum compression factor, and alpha = N/K. According to the invention, the method is easily realized, and the complexity of a demodulation algorithm is quite low.

Description

technical field [0001] The invention relates to a high spectral efficiency division multiplexing communication method, in particular to a high spectral efficiency division multiplexing communication method based on zero tailing DFT expansion, and belongs to the technical field of information and communication. Background technique [0002] In the 5G era, higher transmission rates are required to meet machine-to-machine communication, IoT data transmission, and integration of traditional mobile communications. Spectrum resources are becoming scarcer, and OFDM (orthogonal frequency division multiplexing) ensures orthogonality between subcarriers. Deploying sub-carrier spectrum resource division at the minimum interval has high spectrum utilization efficiency. However, in the face of faster data transmission rate requirements in the future, the sub-carrier orthogonal transmission scheme is no longer fully applicable. In the case of the same transmission rate, the non-orthogonal...

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Problems solved by technology

[0002] In the 5G era, higher transmission rates are required to meet machine-to-machine communication, IoT data transmission, and integration of traditional mobile communications. Spectrum resources are becoming scarcer, and OFDM (orthogonal frequency division multiplexing) ensures orthogonality between subcarriers. Deploying sub-carrier spectrum resource segmentation at the minimum interval has a high spectrum utilization rate. However, in the face of faster data transmission rate requirements in the future, the sub-carrier orthogonal transmission scheme is no longer fully applicable.

[0005] To sum up, SEFDM, as an efficient frequency division multiplexing scheme, uses a non-orthogonal transmission system to reduce the subcarrier spacing to compress the spectrum and further improve spectrum efficiency. However, the non-orthogonal system will inevitably lead to the deterioration of inter-subcarrier interference. The performance of the receiver is improved, and the design complexity of the receiver for non-orthogonal signal demodulation is not conducive to the realization of

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