CN114039828A

CN114039828A - Wireless communication method based on space reflection modulation of IRS

Info

Publication number: CN114039828A
Application number: CN202111315111.8A
Authority: CN
Inventors: 杨柳; 张痛快
Original assignee: Shanghai Dianji University
Current assignee: Shanghai Dianji University
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-02-11
Anticipated expiration: 2041-11-08
Also published as: CN114039828B

Abstract

The invention discloses a wireless communication method based on space reflection modulation of an IRS (inter-range interference Signal), which solves the problems that the fitness under an extreme environment cannot be determined by the current mainstream coding mode and the performance loss of a bit error rate is caused. The technical scheme is characterized in that signals are transmitted through an antenna diversity technology, a transmitting terminal sends a communication request to a receiving terminal, then the propagation condition of a communication system is judged, and when the condition accords with the sight line transmission environment condition, communication is directly established between the transmitting terminal and the receiving terminal; when the communication is not in accordance with the IRS, the working principle is as follows: and sending signals to a plurality of IRS transmitting elements at a transmitting end, selecting a proper coding rule by an IRS controller to finish coding and sending of the signals, finishing error detection and correction after the signals reach a receiving end, finishing communication when the judgment that the error correction effect is met, and otherwise, requiring IRS retransmission. The wireless communication method based on the space reflection modulation of the IRS can improve the communication quality of a channel and reduce the error rate of a receiving end.

Description

Wireless communication method based on space reflection modulation of IRS

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a wireless communication method based on spatial reflection modulation of an IRS.

Background

At present, the mainstream encoding mode based on the IRS signal uses the on/off state of one reflection element to represent the signal, and is designed based on a single reflection element, which can be really simplified in terms of hardware implementation, and simultaneously, the SNR of the receiving end is relatively acceptable under ideal conditions, but whether the SNR is suitable or not is not clear under extreme environments, so that the design can simplify the difficulty of engineering implementation, but this also brings the loss of Bit Error Rate (BER) performance.

Disclosure of Invention

The invention aims to provide a wireless communication method based on space reflection modulation of IRS, which can improve the communication quality of a channel and reduce the error rate of a receiving end.

The technical purpose of the invention is realized by the following technical scheme:

an IRS-based wireless communication method of spatial reflection modulation comprises the following steps:

transmitting signals through an antenna diversity technology, and transmitting a communication request to a receiving end by a transmitting end;

judging the propagation condition of the communication system, and directly establishing communication between the transmitting terminal and the receiving terminal when the propagation condition of the communication system accords with the sight line transmission environment condition;

when the condition is not in line-of-sight transmission environment, sending a signal to a plurality of IRS emission elements at an emission end based on IRS communication;

the IRS controller selects a proper coding rule to complete the coding transmission of the signal, and the error detection and correction are completed after the signal reaches a receiving end; and finishing communication when judging that the error correction effect is satisfied, otherwise, requiring IRS retransmission.

In conclusion, the invention has the following beneficial effects:

through multiple IRS reflection elements and integrated coding thereof, the defect of single reflection element error rate performance loss can be overcome, a new degree of freedom is provided, the channel capacity is widened, the communication quality of a channel can be effectively improved, and the error rate of a receiving end is reduced.

Drawings

FIG. 1 is a flow chart illustrating a wireless communication method according to the present invention;

fig. 2 is a schematic diagram of a hardware configuration with the number of reflection elements being 16.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In accordance with one or more embodiments, a wireless communication method based on spatial reflection modulation of IRS is disclosed, as shown in fig. 1, comprising the steps of:

the signal is transmitted by the antenna diversity technology, and the transmitting end sends a communication request to the receiving end.

And judging the propagation conditions of the communication system, and directly establishing communication between the transmitting terminal and the receiving terminal when the propagation conditions of the communication system accord with the sight line transmission environment conditions.

And when the non-line-of-sight transmission environment condition is not met, sending a signal to a plurality of IRS transmitting elements at a transmitting end based on the IRS communication. The transmitted signal arrives at the receiver after undergoing IRS reflections in the case of non line of sight (NLOS). The IRS may actively modify the wireless channel between IRS elements through highly controllable and intelligent signal reflections.

The antenna diversity technique uses Space Frequency Block Code (SFBC), when the signal reaches the IRS end, the transmitted signal generates corresponding supervisory code in the IRS, and the supervisory code and the information code element realize coding together. The spatial modulation (ISM) based on the IRS is used for improving a modulation mode, an Orthogonal Frequency Division Multiplexing (OFDM) technology is adopted, the modulation mode adopts 16QAM, and the 16QAM is transmitted to a receiving end through an Additive White Gaussian Noise (AWGN) channel and then demodulated.

Since the position set by the IRS is fixed, the base station has all the position information of the IRS board and the combined use mode of the IRS reflective elements, the IRS reflective elements have passive characteristics and no signal processing function, and the base station completes the control of the IRS by using the IRS controller. The combination mode of a plurality of IRS transmitting elements is that adjacent elements are combined for use, 2 x 1 transmitting diversity is adopted on a transmitting/receiving antenna, and multi-reflection element joint coding is adopted on signal coding. The base station selects a proper combination through the IRS controller and can generate a corresponding supervision bit code element according to the self-selected cyclic code coding rule, the supervision bit code element and the information bit code element are transmitted to a receiving end, the code element has the capacity of error detection and correction, and the capacity is improved along with the increase of reflection combination elements.

As shown in fig. 2, is a uniform planar array of squares (UPA), using adjacent elements in combination, assuming that the number of reflection elements is N, the number of combinations

The information represented is greater than a single element. In fig. 2, for example, N is 16, there are 24 pending expressions, and the advantage of this combination becomes more obvious as N is enlarged.

The prior art designs on the basis of single reflection elements on the basis of coding, which can be really simplified in hardware implementation, and the SNR of the receiving end is relatively acceptable in an ideal situation, but whether the design is suitable or not in an extreme environment is not clear, and the design ignores the influence of the magnetic field on the amplitude, which is obviously unlikely to be realized in real life. The patent proposes that multi-reflection element hybrid coding solves the possible influence of extreme environments and solves the problem of non-compliance through an ISM-OFDM system.

In an IRS-based wireless communication system, where signals are transmitted from a multi-antenna transmitter in an NLOS environment, there may be severe shadowing or blockage between the transmitter and the user without a direct path. At this point, the IRS may act as a non-amplified relay, reflecting and focusing the event signal to the user to facilitate end-to-end communication. Not only can the IRS-based wireless communication system solve the problem of no direct path, but also the patent can solve the problems of unreasonableness of mainstream assumption and further reduction of difficulty of hardware implementation with respect to the improvement of mainstream spatial modulation and the idea of new signal coding combination. The multi-element signal coding is adaptive to ISM-OFDM, the communication quality of a channel is improved, and the Bit Error Rate (BER) of a receiving end is reduced.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. An IRS-based spatial reflection modulation wireless communication method is characterized by comprising the following steps:

2. The IRS-based spatial reflection modulation wireless communication method according to claim 1, wherein: the antenna diversity technology adopts space-frequency block code, when the signal reaches IRS end, the transmitted signal can produce correspondent supervisory code in IRS, and said supervisory code and information code element can be used together to implement coding.

3. The IRS-based spatial reflection modulation wireless communication method according to claim 2, wherein: the combination mode of a plurality of IRS emission elements is that adjacent elements are combined for use, and multi-reflection element joint coding is adopted.

4. The IRS-based spatial reflection modulation wireless communication method of claim 3, wherein: the adopted spatial modulation mode adopts an orthogonal frequency division multiplexing technology, the modulation mode adopts 16QAM, and the 16QAM is transmitted to a receiving end through an additive white Gaussian noise channel and then demodulated.

5. The IRS-based spatial reflection modulation wireless communication method of claim 4, wherein: the IRS controller selects a corresponding transmitting element combination, generates a corresponding supervision bit code element according to an autonomously selected cyclic code coding rule, and transmits the supervision bit code element and the information bit code element to a receiving end.