KR-20260067340-A - low-cost low-complexity wireless transmission method and apparatus

Abstract

A method for transmitting a signal may include: a step of generating a first symbol sequence from a source bit sequence; a step of generating a second symbol sequence by performing PR (phase distortion-resistant) encoding on the first symbol sequence; a step of generating a third symbol sequence by performing real-to-phase converting on the second symbol sequence; a step of generating a fourth symbol sequence by performing RSC (repetitive single carrier) encoding on the third symbol sequence; and a step of performing baseband filtering on the fourth symbol sequence and transmitting the fourth symbol sequence, on which baseband filtering has been performed, through a wireless channel.

Inventors

• 장갑석
• 김경표
• 신우람
• 고영조
• 김용선
• 조원철

Assignees

• 한국전자통신연구원

Dates

Publication Date

20260512

Application Date

20251103

Priority Date

20241105

Claims (18)

1. As a signal transmission method, A step of generating a first symbol sequence from a source bit sequence; A step of generating a second symbol sequence by performing PR (phase distortion-resistant) encoding on the first symbol sequence; A step of generating a third symbol sequence by performing real-to-phase converting on the second symbol sequence; A step of generating a fourth symbol sequence by performing RSC (repetitive single carrier) encoding on the third symbol sequence; and A method comprising the step of performing baseband filtering on the fourth symbol sequence and transmitting the fourth symbol sequence, on which baseband filtering has been performed, through a wireless channel. method.
2. In claim 1, The step of generating the first symbol sequence involves mapping each bit of the source bit sequence to an integer value of -1 or 1 so that they have the same absolute size. method.
3. In claim 1, The above PR encoding is expressed by the following mathematical formula, and The above first symbol sequence is and, the above second symbol sequence is is, silver this It is a scaling factor that causes to be formed between, is the number of symbols constituting the first symbol sequence, method.
4. In claim 3, The above real-phase transformation is expressed by the following mathematical formula, and The above third symbol sequence is person, method.
5. In claim 4, The above RSC encoding is expressed by the following mathematical formula, and The above 4th symbol sequence is is, is a time-domain signal It refers to the topological component of, is the number of symbols constituting the above-mentioned fourth symbol sequence, and is the repetition factor, method.
6. As a method of receiving signals, A step of generating a first symbol sequence by performing baseband filtering on a received signal; A step of generating a second symbol sequence by performing RSC (repetitive single carrier) demapping on the first symbol sequence; A step of generating a third symbol sequence by performing time-to-phase converting on the second symbol sequence; A step of generating a fourth symbol sequence by performing PR (phase distortion-resistant) decoding on the third symbol sequence; and A method comprising the step of generating a source bit sequence restored from the above-mentioned fourth symbol sequence, method.
7. In claim 6, The method further comprises the step of performing time-to-frequency converting, frequency-domain equalizing, and frequency-to-time converting on the first symbol sequence. method.
8. In claim 6, The above first symbol sequence is expressed as a time domain signal by the following mathematical formula, and means received power, and is a time-domain signal It refers to the topological component of, is a signal It means the size component for, refers to the wireless fading channel, and represents the carrier frequency offset (CFO), and ... means noise, and is the number of symbols constituting the second symbol sequence above, and is the repetition factor, method.
9. In claim 8, The above RSC demapping is expressed by the following mathematical formula, and The above is the above second symbol sequence, and silver As the complex conjugate of The real component is taken as is, and the imaginary component is a signal with reversed polarity, method.
10. In claim 9, The above second symbol sequence is , , Under the assumption expressed as, method.
11. In claim 10, The symbol sequence from which repetitions have been removed from the above second symbol sequence is expressed by the following mathematical formula, and or atan2(imag( ),real( )). imag( ) and real( Each ) Meaning the imaginary and real components of, method.
12. In claim 11, The above PR decoding process is expressed by the following mathematical formula, and The above 4th symbol sequence is person, method.
13. In claim 6, In the step of generating the restored source bit sequence, each symbol of the fourth symbol sequence is mapped to a bit value of 1 or 0, method.
14. A signal transmission device comprising at least one processor, The above at least one processor is the signal transmission device: A step of generating a first symbol sequence from a source bit sequence; A step of generating a second symbol sequence by performing PR (phase distortion-resistant) encoding on the first symbol sequence; A step of generating a third symbol sequence by performing real-to-phase converting on the second symbol sequence; A step of generating a fourth symbol sequence by performing RSC (repetitive single carrier) encoding on the third symbol sequence; and A step of performing baseband filtering on the fourth symbol sequence and transmitting the fourth symbol sequence, on which baseband filtering has been performed, through a wireless channel. Signal transmission device.
15. In claim 14, In the step of generating the first symbol sequence, each bit of the source bit sequence is mapped to an integer value of -1 or 1 to have the same absolute size, Signal transmission device.
16. In claim 14, The above PR encoding is expressed by the following mathematical formula, and The above first symbol sequence is and, the above second symbol sequence is is, silver this It is a scaling factor that causes to be formed between, is the number of symbols constituting the first symbol sequence, Signal transmission device.
17. In claim 16, The above real-phase transformation is expressed by the following mathematical formula, and The above third symbol sequence is person, Signal transmission device.
18. In claim 17, The above RSC encoding is expressed by the following mathematical formula, and The above 4th symbol sequence is is, is a time-domain signal It refers to the topological component of, is the number of symbols constituting the above-mentioned fourth symbol sequence, and is the repetition factor, Signal transmission device.

Description

Low-cost, low-complexity wireless transmission method and apparatus The present invention relates to wireless transmission technology, and more specifically, to a low-cost, low-complexity wireless transmission method and communication device that provide a wide communication range while having robust resistance to phase distortion caused by hardware impairment, Doppler shift, etc. It is impossible to power all IoT (Internet of Things) devices that require battery replacement or manual charging, which leads to high maintenance costs and serious environmental issues. Automation and digitalization across various industries are opening up new markets that demand battery-free, power-free IoT devices without energy storage capabilities that do not require manual replacement or charging. Power-free IoT devices refer to devices that utilize energy harvested from ambient sources such as radio waves, light, motion, heat, or other suitable power sources. Barcodes and RFID (Radio-Frequency Identification) tags, which are currently used in most industries, can be considered ultra-small, low-cost, and low-complexity battery-free IoT devices. However, despite having a limited reading range of a few meters, these conventional power-free IoT devices require passive scanning, resulting in labor-intensive and time-consuming tasks. Accordingly, a study item named Ambient IoT (hereinafter "AIoT") is currently underway to automatically manage hundreds of power-free IoT devices by a mobile communication system within a wide reading range of 10 to 50 m in the 3GPP (Third Generation Partner Project) Rel-19 standard, which began in 2024. FIG. 1 is a conceptual diagram illustrating embodiments of a communication system. FIG. 2 is a block diagram illustrating embodiments of the device. Figures 3a and 3b are conceptual diagrams illustrating two AIoT topologies currently under discussion at 3GPP. Figure 4 is a graph comparing the BER (block error rate) performance of the PR-SC transmission method and the conventional transmission method when channel coding/estimation is not used. FIG. 5 is a block diagram illustrating a PR-RSC transmission method according to an embodiment of the present disclosure. FIG. 6 is a conceptual diagram illustrating 2-BASK modulation according to an embodiment of the present disclosure. FIG. 7 is a conceptual diagram illustrating the RSC encoding applied to the PR-RSC transmission method of the present disclosure. The present disclosure is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present disclosure. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and/or" includes a combination of a plurality of related described items or any of a plurality of related described items. In embodiments of the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B". Additionally, in embodiments of the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B". When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. The terms used in this disclosure are used merely to describe specific embodiments and are not intended to limit this disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this