KR-20260068001-A - METHOD AND APPARATUS FOR DISCRETE FOURIER SPREAD FREQUENCY DIVISION MULTIPLEXING BASED ON PHASE MODULATION

Abstract

The present disclosure relates to a phase modulation-based discrete Fourier spread frequency division multiplexing technique. The present disclosure may provide a method of a transmitting device comprising: performing orthogonal amplitude modulation on information bits to generate orthogonal amplitude modulated symbols; performing spreading on the orthogonal amplitude modulated symbols to generate a first output; performing an inverse discrete Fourier transform on the spread first output; modulating the inverse discrete Fourier transformed first output; and transmitting the modulated first output to a receiving device.

Inventors

• 김경표
• 신우람
• 고영조
• 장갑석

Assignees

• 한국전자통신연구원

Dates

Publication Date

20260513

Application Date

20251103

Priority Date

20241106

Claims (1)

1. As a method of a transmitting device, A step of generating orthogonally amplitude modulated symbols by performing orthogonal amplitude modulation on information bits; A step of generating a first output by performing spreading on the above orthogonal amplitude modulation symbols; A step of inversely discrete Fourier transforming the above-mentioned diffused first output; The step of modulating the first output obtained by the inverse discrete Fourier transform above; and The step of transmitting the above-mentioned modulated first output to a receiving device, Method of a transmitting device.

Description

Method and apparatus for Discrete Fourier Spread Frequency Division Multiplexing Based on Phase Modulation The present disclosure relates to a phase modulation-based discrete Fourier spread frequency division multiplexing technique, and more specifically, to a phase modulation-based discrete Fourier spread frequency division multiplexing technique for applying discrete Fourier transform spreading to an orthogonal frequency division multiplexing method. Along with the advancement of information and communication technology, various wireless communication technologies can be developed. Representative wireless communication technologies include LTE (long term evolution), NR (new radio), and 6G (6th Generation), which are defined in the 3GPP (3rd generation partnership project) standards. LTE can be one of the wireless communication technologies among 4G (4th Generation) wireless communication technologies, and NR can be one of the wireless communication technologies among 5G (5th Generation) wireless communication technologies. To handle the surge in wireless data following the commercialization of 4G communication systems (e.g., communication systems supporting LTE), not only the frequency bands of 4G communication systems (e.g., frequency bands below 6 GHz) but also 5G communication systems (e.g., communication systems supporting NR) that use frequency bands higher than those of 4G communication systems (e.g., frequency bands above 6 GHz) may be considered. 5G communication systems can support eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication). Such a communication system may use the Orthogonal Frequency Division Multiplexing (OFDM) method. In a communication system using the Orthogonal Frequency Division Multiplexing method, the transmitting device may include an Inverse Discrete Fourier Transformer and a modulator. In the transmitting device, the Inverse Discrete Fourier Transformer may output a signal in the form of a complex number. The modulator may receive the signal in the form of a complex number from the Inverse Discrete Fourier Transformer and modulate the received signal in the form of a complex number to the magnitude of the real part. As a result, information loss may occur. Figure 1 is a conceptual diagram illustrating an embodiment of a communication system. FIG. 2 is a block diagram illustrating an example of a communication node constituting a communication system. FIG. 3 is a block diagram showing embodiments of a transmitting device of a constant envelope orthogonal frequency division multiplexing system. FIG. 4 is a block diagram showing embodiments of a receiving device of a constant envelope orthogonal frequency division multiplexing system. FIG. 5 is a block diagram showing embodiments of a transmitting device of a frequency modulation orthogonal frequency division multiplexing system. FIG. 6 is a block diagram showing embodiments of a receiving device of a frequency modulation orthogonal frequency division multiplexing system. FIG. 7 is a block diagram showing embodiments of an inverse discrete Fourier transform and a phase modulator or frequency modulator. Figure 8 is a graph showing the packet error ratio (PER) of a constant envelope orthogonal frequency division multiplexing system according to the modulation index. Figure 9 is a graph showing the package error rate of a frequency modulation orthogonal frequency division multiplexing system according to the modulation index. Figure 10 is a graph showing the empirical distribution of the ratio of maximum power to average power in an orthogonal frequency division multiplexing system according to the resource allocation method. FIG. 11 is a block diagram showing an example of a communication system that applies a diffusion method to the input of an inverse discrete Fourier transform. FIG. 12 is a conceptual diagram showing an example of a method for dividing orthogonal amplitude modulation symbols. FIG. 13 is a conceptual diagram showing embodiments of a method for spreading orthogonal amplitude modulation symbols. FIG. 14 is a conceptual diagram showing embodiments of a conjugate symmetric resource allocation method. FIG. 15 is a block diagram showing embodiments of a transmitting device of a phase modulation-based discrete Fourier spread frequency division multiplexing system. FIG. 16 is a block diagram showing embodiments of a receiving device of a phase modulation-based discrete Fourier spread frequency division multiplexing system. FIG. 17 is a block diagram showing embodiments of a channel equalizer. FIG. 18 is a block diagram showing embodiments of a receiving device of a phase modulation-based discrete Fourier spread frequency division multiplexing system. Figure 19 is a graph showing the packet error rate according to the modulation index of a constant envelope orthogonal frequency division multiplexing system. Figure 20 is a graph showing the