Efficient frequency-division multiplexing waveform generation method based on zero-trailing DFT extension

Abstract

The invention provides an efficient frequency-division multiplexing waveform generation method based on zero-trailing DFT extension, and belongs to the technical field of the information and communication. The efficient frequency-division multiplexing waveform is high in spectrum effect, low in out-of-band leakage and low in peak-to-average ratio. The method comprises the following steps: step one, performing zero-filling on the head and tail of a sending end modulation symbol to acquire a time domain sending symbol sequence, performing DFT extension transform of N points on the time domain sending symbol sequence to obtain a frequency domain signal vector; step two, filing (1-a)N / a zeros at the tail of the obtained frequency domain signal vector, and performing sub-carrier mapping on the zero-filled frequency domain signal vector; and step three, performing IFFT transform of K points on the signal vector after the sub-carrier mapping, abandoning last (1-a)N / a data of the acquired frequency domain signal vector after the transformation, wherein the rest N data is the time domain sending symbol vector with the zero-trailing feature, and the formed waveform is the generated efficient frequency-division multiplexing waveform; a represents the spectrum compression factor, and a is equal to N / K.

Description

technical field [0001] The invention relates to a method for generating high-efficiency frequency-division multiplexing waveforms, in particular to a method for generating high-efficiency frequency-division multiplexing waveforms based on zero-tailing DFT expansion, and the invention 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...

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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.

[0004] To sum up, SEFDM, as an efficient frequency division multiplexing scheme, uses non-orthogonal transmission system to reduce subcarrier spacing to compress spectrum and further improve spectrum efficiency. However, inter-subcarrier interference that non-orthogonal system cannot bring is to a certain extent It worsens the sideband leakage of signal transmission, which is not conducive to energy concentration, and on the other hand leads to a higher signal peak-to-average ratio

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