CN112564777A - Backscattering communication system and method for assisting excitation receiving synchronization - Google Patents
Backscattering communication system and method for assisting excitation receiving synchronization Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
本发明提供了一种协助激励接收同步的反向散射通信系统及方法，属于无线通信技术和物联网领域，包括终端、激励器和接收器，彼此间可通过有线或无线方式连接。本发明中终端包括多种调制方式，分别对应不同相位的激励反射信号；系统通信和终端接入过程中，系统需要进行接入广播并根据终端响应信息返回确认信息，终端需要根据系统广播和确认信息分别返回响应信息和确认回复；通信过程中，终端可以选择调制方式和同步状态返回响应信息或确认回复，系统可以多次进行接入广播并等待终端返回响应或确认信息；终端响应和回复过程都支持附带传输数据信息。本发明减小了终端和激励器或者终端和接收器间的同步误差，提升了激励干扰消除能力和通信解调能力。
The invention provides a backscatter communication system and method for assisting excitation and reception synchronization, belonging to the field of wireless communication technology and the Internet of Things, including a terminal, an exciter and a receiver, which can be connected to each other in a wired or wireless manner. In the present invention, the terminal includes a variety of modulation modes, which correspond to the excitation and reflection signals of different phases respectively; in the process of system communication and terminal access, the system needs to perform access broadcast and return confirmation information according to the terminal response information, and the terminal needs to broadcast and confirm according to the system. The information returns response information and confirmation reply respectively; during the communication process, the terminal can select the modulation mode and synchronization state to return the response information or confirmation reply, the system can access broadcast multiple times and wait for the terminal to return the response or confirmation information; the terminal response and reply process Both support the attached transmission data information. The invention reduces the synchronization error between the terminal and the exciter or between the terminal and the receiver, and improves the ability of eliminating excitation interference and the ability of communication demodulation.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a backscattering communication system and a backscattering communication method for assisting excitation receiving synchronization.
Background
For a backscatter communication system, because the cost and power consumption of a terminal limit the signal processing and communication capabilities, and the terminal does not actively transmit a radio frequency signal but reflects a radio frequency excitation signal, the energy of a terminal feedback signal superposed on the terminal feedback signal is much lower than that of the excitation signal due to the distance between an excitation signal source and the terminal, so that the excitation signal is interference at a receiver relative to the terminal feedback signal, and how to remove the interference is a key factor for realizing the backscatter communication system.
For backscatter communications, a variety of signals can be used as the radio frequency excitation signal, and the interference of the radio frequency excitation signal also includes, in addition to the excitation signal itself, interference caused by various errors of the excitation signal, such as phase noise, frequency offset, spatial multipath, and other errors of the excitation signal. In order to identify the terminal feedback signal, the terminal feedback signal usually has a certain difference from the excitation signal itself in frequency, time, phase and amplitude, so that the excitation signal itself is usually easier to cancel at the receiver, but because the phase noise, frequency offset, spatial multipath and other errors of the excitation signal and the terminal feedback signal may be at the same frequency and the same time, the terminal feedback signal is usually much smaller in energy than the excitation signal, the phase noise, frequency offset, spatial multipath and other errors of the excitation signal are not easy to cancel at the receiving end, and large interference may be generated on the terminal feedback signal, resulting in a reduction in signal-to-noise ratio, and limiting the excitation distance excited/transmitted to the terminal.
The existing excitation interference technology, namely radio frequency interference cancellation technology and digital interference cancellation technology, mainly aims at the traditional receiving and transmitting integrated architecture and excitation and receiving synchronous receiving and transmitting separated architecture backscattering communication system to carry out interference cancellation. Because the problem of asynchronism between the excitation channel and the receiving channel of the excitation and receiving asynchronous transceiving separation architecture is not solved, the existing excitation interference technology cannot effectively reduce the influence of excitation interference in the architecture. In the demodulation process of the existing excitation and reception asynchronous transceiving separation architecture, demodulation processing is usually directly carried out on asynchronous terminal signals, and the influence of interference such as excitation, phase noise and multipath is ignored, so that the communication performance and the communication distance are unstable and limited to a certain extent.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention provides a backscatter communication system and method for assisting in receiving and exciting synchronization, which solves the synchronization problem between asynchronous excitation and reception channels.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a backscattering communication system assisting in excitation and reception synchronization, which comprises a terminal, an exciter and a receiver; the terminal, the exciter and the receiver can be arranged on the same device or different devices; the two can be connected by a wire through equipment; the mutual wireless connection can be carried out without equipment; and the devices are connected with each other in a wired and wireless mixed mode.
Further, the channel between the exciter and the receiver comprises the following three architectures:
the first method comprises the following steps: the channels of the exciter and the receiver work independently;
and the second method comprises the following steps: the channels of the exciter and the receiver are the same;
and the third is that: the channels of the exciter and the receiver are connected through a physical channel.
Still further, the modulation modes of the terminal include at least two modulation modes, where the phase difference between the reflected excitation signals of the terminal in the two modulation modes includes 90 °, and the phase difference between the reflected excitation signals of the terminal in the multiple modulation modes includes 60 °.
Still further, the terminal embeds waveforms generated by different modulation modes in the reflected signal waveform corresponding to each code element baseband data, and can perform terminal access and data transmission by the existing backscattering communication method.
Based on the system, the invention provides a backscattering communication method for assisting in stimulating receiving synchronization, which comprises the following steps:
s1, registering the terminal access network;
s2, sending broadcast signals to the terminal by the exciter, and enabling the receiver to wait for a fixed time T1 by itself, and enabling the terminal to wait for receiving the broadcast signals;
s3, if the terminal receives the broadcast signal in S2, recording the characteristics or requirements of the received broadcast signal, automatically selecting a modulation mode to respond according to the recorded characteristics or requirements of the broadcast signal or the self state of the terminal, sending the response result to a receiver to demodulate, and automatically waiting for a fixed time T2 by the terminal;
s4, judging whether the terminal response result in the step S3 can be received by the receiver, if the receiver can receive the terminal response result in the fixed time T1, informing the exciter to send a confirmation signal corresponding to the response result in the step S3 to the terminal, enabling the receiver to wait for the fixed time T3 by itself, and entering the step S5, otherwise, entering the step S7;
s5, using the terminal to judge whether the confirmation signal in the step S4 can be demodulated, if the terminal demodulates the confirmation signal in the step S4 within the fixed time T2, using the terminal to self-select the modulation mode according to the characteristics or requirements of the confirmation signal or the self state of the terminal, returning a confirmation reply signal to the receiver, and entering the step S6, otherwise, the terminal continues to wait, and entering the step S9;
s6, judging whether the acknowledgement reply signal returned by the terminal in the step S5 can be demodulated by using a receiver, if the receiver demodulates the acknowledgement reply signal returned by the terminal in the step S5 within a fixed time T3, finishing terminal access according to the acknowledgement reply signal, continuing to perform data communication, finishing backscattering communication of excitation and reception synchronization, and otherwise, entering the step S8;
s7, judging whether the waiting time of the receiver does not exceed the fixed time T1, if so, entering the step S9, otherwise, returning to the step S2;
s8, judging whether the waiting time of the receiver does not exceed the fixed time T3, if yes, the receiver informs the exciter to send a confirmation signal again, and returning to the step S5, otherwise, returning to the step S2;
s9, judging whether the waiting time of the terminal does not exceed the fixed time T2, if so, selecting a modulation mode by the terminal according to the recorded characteristics or requirements of the broadcast signal or the self state of the terminal, responding to the broadcast signal in the step S2 again, sending the response result to the receiver for demodulation, and returning to the step S4, otherwise, returning to the step S2.
Further, data communication can be performed between the terminal and the receiver while the terminal returns the response result and the confirmation reply signal.
Still further, the receiver can wait for the terminal to respond at least one or more times and can wait for the terminal to reply with at least one or more acknowledgements.
8. The method of claim 5, wherein the receiver is capable of at least one or more access broadcasts and at least one or more acknowledgements to the terminals.
The invention has the beneficial effects that:
(1) the invention provides a new framework and a new communication flow of a backscattering communication terminal capable of assisting in exciting and receiving synchronous backscattering communication terminals aiming at an exciting and receiving asynchronous transceiving separated framework backscattering communication system, and reduces the synchronous error between the terminal and an exciter or between the terminal and a receiver by adjusting the synchronous state and the flow response state of a terminal signal, thereby reducing the synchronous problem between the exciter and the receiver, improving the performance of an interference cancellation technology in the subsequent excitation interference elimination, effectively reducing the excitation interference of a receiving channel and improving the demodulation capability of the terminal signal.
(2) The invention is not only suitable for the excitation and receiving asynchronous receiving and transmitting separation framework, but also can reduce the requirements of the excitation interference elimination process in the receiving and transmitting integrated framework and the excitation and receiving synchronous receiving and transmitting separation framework on the synchronous performance of the excitation and receiving channels, can improve the excitation interference elimination capability, the receiving demodulation performance and the receiving communication distance of the excitation and receiving asynchronous receiving and transmitting separation framework, and simultaneously has gain on the interference elimination process of the receiving and transmitting integrated framework and the excitation and receiving synchronous receiving and transmitting separation framework.
(3) The invention helps to improve the signal synchronization performance between the excitation channel and the receiving channel by optimizing the terminal architecture and the communication flow, and particularly can improve the excitation interference elimination capability and the communication demodulation capability of the backscattering communication system of the excitation and receiving asynchronous receiving and transmitting separation architecture, thereby expanding the practical application scene of the backscattering communication system.
(4) The terminal comprises a plurality of modulation modes, and the phases of the reflected excitation signals among different modulation modes are different; in the process of system communication and terminal access, the terminal can switch the modulation mode and the synchronous state to respond again when receiving no receiving confirmation, so that the invention assists in improving the receiving channel excitation interference elimination capability and the communication demodulation capability.
(5) The terminal can support the transmission of the attached data information in all the terminal response and reply flows, so that the characteristic that the data transmission is carried out while the access network generally adopted by the current communication terminal of the Internet of things is supported, and the power consumption and the waiting time of the terminal can be reduced.
Drawings
Fig. 1 is a system architecture diagram of embodiment 1 of the present invention.
Fig. 2 is a flowchart of the method of embodiment 2.
Fig. 3 is a schematic diagram of the terminal architecture and waveforms of embodiment 3.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
In order to realize deployment of a backscatter communication system with lower cost, a backscatter communication system with an excitation and reception asynchronous transceiving separation architecture is a more appropriate architecture scheme, but the problem of synchronization between asynchronous excitation and reception channels needs to be solved to better eliminate excitation interference and improve demodulation capability of a receiver terminal signal. In order to solve the problem of synchronization between asynchronous excitation receiving channels, synchronization can be carried out between an exciter and a receiver, and synchronization can also be carried out between a terminal and the exciter or between the terminal and the receiver. The invention provides a backscattering communication system capable of assisting in exciting and receiving synchronization, which can reduce the synchronization error between a terminal and an exciter or between the terminal and a receiver, thereby lightening the synchronization problem between the exciter and the receiver, improving the performance of an interference cancellation technology in subsequent excitation interference elimination, effectively reducing the excitation interference of a receiving channel, and improving the demodulation capability of a terminal signal, as shown in figure 1, the backscattering communication system comprises the terminal, the exciter and the receiver; the terminal, the exciter and the receiver can be arranged on the same device or different devices; the two can be connected by a wire through equipment; the mutual wireless connection can be carried out without equipment; and the devices are connected with each other in a wired and wireless mixed mode. The channel between the exciter and the receiver comprises the following three architectures: the first method comprises the following steps: the channels of the exciter and the receiver work independently; and the second method comprises the following steps: the channels of the exciter and the receiver are the same; and the third is that: the channels of the exciter and the receiver are connected through a physical channel.
In this embodiment, as shown in fig. 1, the excitation and reception may be excitation and reception channels in backscatter communication systems with three different architectures, and may be on the same device as each other, or on different devices, and may be connected to each other through a device connection or other means. In the communication process of the system, the terminal needs to access the network for registration first, and then data communication information can be additionally transmitted while access response and confirmation are carried out, or data communication is carried out after the access process is completed.
In this embodiment, as shown in fig. 2, the terminal modulation process includes at least two modulation modes, that is, the terminal needs to perform at least two phase reflection modulations on the excitation signal in the process of reflecting the excitation signal. The excitation signals reflected between different modulation modes have phase difference, and the phase difference is related to the number of the modulation modes. A typical phase difference between the reflected excitation signals in the two modulation modes may be 90 ° or some other value. A typical phase difference between the reflected excitation signals for multiple modulation modes may be 60 ° or some other value.
In this embodiment, the synchronization error between the terminal and the exciter or between the terminal and the receiver is reduced by adjusting the terminal signal synchronization state and the process response state, so that the synchronization problem between the exciter and the receiver is reduced, the performance of the interference cancellation technique in the subsequent excitation interference cancellation is improved, the excitation interference can be effectively reduced by the receiving channel, and the demodulation capability of the terminal signal is improved. The invention is not only suitable for the excitation and receiving asynchronous receiving and transmitting separation framework, but also can reduce the requirements of the excitation interference elimination process in the receiving and transmitting integrated framework and the excitation and receiving synchronous receiving and transmitting separation framework on the synchronous performance of the excitation and receiving channels.
In this embodiment, as shown in fig. 2, the terminal includes multiple modulation modes, and phases of excitation signals reflected by different modulation modes are different; in the process of system communication and terminal access, the terminal can switch the modulation mode and the synchronous state to respond again when receiving no receiving confirmation, thereby assisting in improving the excitation interference elimination capability and the communication demodulation capability of a receiving channel.
In the embodiment, in the process of system communication and terminal access, the system is required to perform access broadcast on the terminal, the terminal needs to select a modulation mode and a synchronous state to return response information after receiving a broadcast signal, the system needs to confirm the terminal after receiving the terminal response information, the terminal can perform at least one or more confirmation replies if receiving the system confirmation information, and the terminal switches the modulation mode and the synchronous state to perform response again if not receiving the system confirmation information; if the system does not receive the terminal response information, the system can send the broadcast signal again or wait for the terminal to return the response information again; if the terminal receives the broadcast signal again, the terminal can switch the modulation mode and the synchronous state to respond again according to the characteristics of the received broadcast signal or the requirement; if the terminal does not receive the broadcast signal, the terminal can switch the modulation mode and the synchronous state according to the state of the terminal to respond again.
The invention helps to improve the signal synchronization performance between the excitation channel and the receiving channel by optimizing the terminal architecture and the communication flow, particularly can improve the excitation interference elimination capability and the communication demodulation capability of the excitation and receiving asynchronous receiving and transmitting separation architecture backscatter communication system, and is also suitable for the backscatter communication system of the receiving and transmitting integration and excitation and receiving synchronous receiving and transmitting separation architecture, thereby expanding the practical application scene of the backscatter communication system. The invention is not only suitable for the excitation and receiving asynchronous receiving and transmitting separation framework, but also can reduce the requirements of the excitation interference elimination process in the receiving and transmitting integrated framework and the excitation and receiving synchronous receiving and transmitting separation framework on the synchronous performance of the excitation and receiving channels.
Example 2
As shown in fig. 1 and 2, the present invention provides a backscatter communication method for assisting in stimulating reception synchronization, which is implemented as follows:
s1, registering the terminal access network;
s2, sending broadcast signals to the terminal by the exciter, and enabling the receiver to wait for a fixed time T1 by itself, and enabling the terminal to wait for receiving the broadcast signals;
s3, if the terminal receives the broadcast signal in S2, recording the characteristics or requirements of the received broadcast signal, automatically selecting a modulation mode to respond according to the recorded characteristics or requirements of the broadcast signal or the self state of the terminal, sending the response result to a receiver to demodulate, and automatically waiting for a fixed time T2 by the terminal;
s4, judging whether the terminal response result in the step S3 can be received by the receiver, if the receiver can receive the terminal response result in the fixed time T1, informing the exciter to send a confirmation signal corresponding to the response result in the step S3 to the terminal, enabling the receiver to wait for the fixed time T3 by itself, and entering the step S5, otherwise, entering the step S7;
s5, using the terminal to judge whether the confirmation signal in the step S4 can be demodulated, if the terminal demodulates the confirmation signal in the step S4 within the fixed time T2, using the terminal to self-select the modulation mode according to the characteristics or requirements of the confirmation signal or the self state of the terminal, returning a confirmation reply signal to the receiver, and entering the step S6, otherwise, the terminal continues to wait, and entering the step S9;
s6, judging whether the acknowledgement reply signal returned by the terminal in the step S5 can be demodulated by using a receiver, if the receiver demodulates the acknowledgement reply signal returned by the terminal in the step S5 within a fixed time T3, finishing terminal access according to the acknowledgement reply signal, continuing to perform data communication, finishing backscattering communication of excitation and reception synchronization, and otherwise, entering the step S8;
s7, judging whether the waiting time of the receiver does not exceed the fixed time T1, if so, entering the step S9, otherwise, returning to the step S2;
s8, judging whether the waiting time of the receiver does not exceed the fixed time T3, if yes, the receiver informs the exciter to send a confirmation signal again, and returning to the step S5, otherwise, returning to the step S2;
s9, judging whether the waiting time of the terminal does not exceed the fixed time T2, if so, selecting a modulation mode by the terminal according to the recorded characteristics or requirements of the broadcast signal or the self state of the terminal, responding to the broadcast signal in the step S2 again, sending the response result to the receiver for demodulation, and returning to the step S4, otherwise, returning to the step S2.
In this embodiment, the terminal and the receiver can perform data communication while the terminal returns the response result and the acknowledgement signal.
In this embodiment, the receiver may wait for the terminal to perform at least one or more responses, and may wait for the terminal to perform at least one or more acknowledgement responses.
In this embodiment, the receiver is capable of performing at least one or more access broadcasts and transmitting at least one or more acknowledgement messages to the terminal.
In this embodiment, as shown in fig. 1 and fig. 2, the excitation and the reception may be excitation and reception channels in backscatter communication systems with three different architectures, and may be on the same device as each other, or on different devices, and may be connected to each other through a device connection or other means. In the communication process of the system, the terminal needs to access the network for registration first, and then data communication information can be additionally transmitted while access response and confirmation are carried out, or data communication is carried out after the access process is completed. A typical access process is as shown in fig. 2, a stimulus first broadcasts, a terminal receives a broadcast signal and then responds 1 in a modulation 1 mode, if the terminal can correctly demodulate the response 1, the terminal notifies the stimulus to send an acknowledgement 1, and the terminal receives the acknowledgement 1 and replies to inform the system to confirm the network entry and perform subsequent data communication. The flow is a simplified access flow, more response and confirmation processes can be added in the middle, and the introduction schematic of the flow is not influenced. The flow is a normal access flow of the terminal, if the receiving can not correctly demodulate and confirm the reply 1, the terminal can be waited to continue replying or broadcast again, and if the receiving can not correctly demodulate and respond 1, the terminal can also be waited to continue responding or broadcast again. After the terminal performs the confirmation reply, if the access is still not successful or the data communication is performed, and if the system does not perform the rebroadcast, as shown in fig. 2(b), the terminal may wait for a period of time and then change the modulation mode by itself to perform the confirmation reply again, and continue to wait until the terminal completes the access flow of the terminal or performs the data communication after correctly demodulating the confirmation reply of the terminal. After the terminal responds, if the terminal does not receive the acknowledgement and if the system does not perform rebroadcast, as shown in fig. 2(c), the terminal may wait for a period of time within a waiting time T2 and then change the modulation scheme by itself to perform a re-response, and after receiving, continue to wait until the terminal response is correctly demodulated and then send a corresponding acknowledgement signal. The reception may wait for the terminal to respond at least once or more. If the reception wait time T1 ends, the reception may inform the incentive to broadcast again and resume the access procedure.
In this embodiment, since the terminal actively changes the phase and the synchronization state of the reflected signal, the terminal can synchronize the excitation or the terminal receives, which is equivalent to changing the synchronization state between the excitation channel and the reception channel. When the synchronous error between the terminal reflection signal and the excitation interference signal or the receiving reference signal is reduced, the receiving demodulation excitation interference elimination capability is improved, so that the terminal signal demodulation capability is improved. The present invention may increase the success rate of terminal access, but may result in increased communication flow and prolonged communication time.
In this embodiment, the terminal includes multiple modulation modes, and the phases of the reflected excitation signals are different among the different modulation modes; in the process of system communication and terminal access, the terminal can switch the modulation mode and the synchronous state to respond again when receiving no receiving confirmation, thereby assisting in improving the excitation interference elimination capability and the communication demodulation capability of a receiving channel.
In the embodiment, in the process of system communication and terminal access, the system is required to perform access broadcast on the terminal, the terminal needs to select a modulation mode and a synchronous state to return response information after receiving a broadcast signal, the system needs to confirm the terminal after receiving the terminal response information, the terminal can perform at least one or more confirmation replies if receiving the system confirmation information, and the terminal switches the modulation mode and the synchronous state to perform response again if not receiving the system confirmation information; if the system does not receive the terminal response information, the system can send the broadcast signal again or wait for the terminal to return the response information again; if the terminal receives the broadcast signal again, the terminal can switch the modulation mode and the synchronous state to respond again according to the characteristics of the received broadcast signal or the requirement; if the terminal does not receive the broadcast signal, the terminal can switch the modulation mode and the synchronous state according to the state of the terminal to respond again.
The invention helps to improve the signal synchronization performance between the excitation channel and the receiving channel by optimizing the terminal architecture and the communication flow, particularly can improve the excitation interference elimination capability and the communication demodulation capability of the excitation and receiving asynchronous receiving and transmitting separation architecture backscatter communication system, and is also suitable for the backscatter communication system of the receiving and transmitting integration and excitation and receiving synchronous receiving and transmitting separation architecture, thereby expanding the practical application scene of the backscatter communication system. The invention is not only suitable for the excitation and receiving asynchronous receiving and transmitting separation framework, but also can reduce the requirements of the excitation interference elimination process in the receiving and transmitting integrated framework and the excitation and receiving synchronous receiving and transmitting separation framework on the synchronous performance of the excitation and receiving channels.
Example 3
As shown in fig. 3, the present invention provides a backscatter communication system capable of assisting in excitation and reception synchronization, so that the system can reduce synchronization errors between a terminal and an exciter or between a terminal and a receiver, thereby alleviating the synchronization problem between an exciter and a receiver, and improving the performance of an interference cancellation technique in subsequent excitation interference cancellation, so that a receiving channel can effectively reduce excitation interference, and the demodulation capability of a terminal signal is improved, as shown in fig. 1, including a terminal, an exciter and a receiver; the terminal, the exciter and the receiver can be arranged on the same device or different devices; the terminal is respectively connected with the exciter and the receiver through a wireless air interface, and the exciter and the receiver are connected in a wired or wireless mode. The channel between the exciter and the receiver comprises the following three architectures: the first method comprises the following steps: the channels of the exciter and the receiver work independently; and the second method comprises the following steps: the channels of the exciter and the receiver are the same; and the third is that: the channels of the exciter and the receiver are connected through a physical channel. And the terminal embeds waveforms generated by different modulation modes in the reflected signal waveform corresponding to each code element baseband data.
In this embodiment, the terminal modulation process includes at least two modulation modes, that is, the terminal needs to perform at least two phase reflection modulations on the excitation signal in the process of reflecting the excitation signal. The excitation signals reflected between different modulation modes have phase difference, and the phase difference is related to the number of the modulation modes. A typical phase difference between the reflected excitation signals in the two modulation modes may be 90 ° or some other value. A typical phase difference between the reflected excitation signals for multiple modulation modes may be 60 ° or some other value.
In this embodiment, the backscatter communication system may adopt an existing communication procedure, but the terminal reflection waveform needs to be changed. Specifically, as shown in fig. 3, the terminal embeds waveforms generated by different modulation schemes in the reflected signal waveform corresponding to each symbol baseband data, that is, one symbol baseband data needs to reflect the excitation signal waveform by different modulation schemes during the reflection modulation process, so that the symbol of each terminal signal includes waveforms of different modulation schemes. The synchronous performances of the excitation or receiving signals corresponding to different modulation modes of the terminal are different, the receiving channel can always find the condition that the synchronous error between the terminal reflection signal and the excitation or receiving signal is small in the demodulation process, and the excitation interference elimination performance is good at the moment, so that the influence of residual excitation interference can be reduced, and the terminal signal demodulation capacity and the demodulation stability are improved. The scheme has the defects that different modulation modes occupy the power of terminal reflection signals in proportion, the modulation mode with poor synchronization performance is equivalent to an invalid terminal signal and can partially influence the demodulation signal-to-noise ratio and the communication performance, but the requirement of the receiving and demodulating excitation interference elimination process in a backscattering communication system on the synchronization performance between an excitation channel and a receiving channel can be reduced, and the excitation interference elimination capability, the receiving and demodulating performance, the receiving communication distance and the terminal access stability of an excitation and receiving asynchronous receiving and transmitting separation framework can be improved. The invention also has gain to the interference elimination process of the backscattering communication system of the receiving and transmitting integrated framework and the exciting and receiving synchronous receiving and transmitting separated framework.
In this embodiment, the terminal includes multiple modulation modes, and the phases of the reflected excitation signals are different among the different modulation modes; in the process of system communication and terminal access, the terminal can switch the modulation mode and the synchronous state to respond again when receiving no receiving confirmation, thereby assisting in improving the excitation interference elimination capability and the communication demodulation capability of a receiving channel.
In the embodiment, in the process of system communication and terminal access, the system is required to perform access broadcast on the terminal, the terminal needs to select a modulation mode and a synchronous state to return response information after receiving a broadcast signal, the system needs to confirm the terminal after receiving the terminal response information, the terminal can perform at least one or more confirmation replies if receiving the system confirmation information, and the terminal switches the modulation mode and the synchronous state to perform response again if not receiving the system confirmation information; if the system does not receive the terminal response information, the system can send the broadcast signal again or wait for the terminal to return the response information again; if the terminal receives the broadcast signal again, the terminal can switch the modulation mode and the synchronous state to respond again according to the characteristics of the received broadcast signal or the requirement; if the terminal does not receive the broadcast signal, the terminal can switch the modulation mode and the synchronous state according to the state of the terminal to respond again.
The invention helps to improve the signal synchronization performance between the excitation channel and the receiving channel by optimizing the terminal architecture and the communication flow, particularly can improve the excitation interference elimination capability and the communication demodulation capability of the excitation and receiving asynchronous receiving and transmitting separation architecture backscatter communication system, and is also suitable for the backscatter communication system of the receiving and transmitting integration and excitation and receiving synchronous receiving and transmitting separation architecture, thereby expanding the practical application scene of the backscatter communication system. The invention is not only suitable for the excitation and receiving asynchronous receiving and transmitting separation framework, but also can reduce the requirements of the excitation interference elimination process in the receiving and transmitting integrated framework and the excitation and receiving synchronous receiving and transmitting separation framework on the synchronous performance of the excitation and receiving channels.
Claims (9)
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| CN202011416711.9A CN112564777B (en) | 2020-12-07 | 2020-12-07 | Backscatter communication system and method for assisting excitation reception synchronization |
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| CN202011416711.9A CN112564777B (en) | 2020-12-07 | 2020-12-07 | Backscatter communication system and method for assisting excitation reception synchronization |
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| CN112769470A (en) * | 2020-12-17 | 2021-05-07 | 成都大学 | Backscattering communication system and method capable of extracting excitation interference |
| WO2023122975A1 (en) * | 2021-12-28 | 2023-07-06 | Oppo广东移动通信有限公司 | Wireless communication methods, terminal devices, and network devices |
| WO2023236826A1 (en) * | 2022-06-06 | 2023-12-14 | 维沃移动通信有限公司 | Access method and apparatus in backscatter communication, and terminal and network-side device |
| CN117676853A (en) * | 2024-02-01 | 2024-03-08 | 成都天传科技有限公司 | Passive wireless dense sensing time-sharing data acquisition method and system |
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