Low-data-rate wireless communication system and method based on sc-fde waveform

Abstract

The application relates to a low-velocity wireless communication system and method based on an SC-FDE waveform, wherein the transmitting link of the system comprises a data segment modulation module and a framing module, and does not comprise a signaling segment modulation module, the receiving link comprises a data segment demodulation module and does not comprise a signaling segment demodulation module, the signaling segment modulation / demodulation module in the overall framework is removed, the overall communication waveform utilization rate of the system is improved, and the frame length is shorter or the rate is higher compared with the traditional technology.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wireless communication, and relates to a low-variable-rate wireless communication system and method based on an SC-FDE waveform. BACKGROUND

[0002] SC-FDE (Single Carrier-Frequency Domain Equalization) is a very effective method for combating multipath effects in wireless transmission, which effectively combines the advantages of single carrier technology and OFDM (Orthogonal Frequency Division Multiplexing) technology, that is, the single carrier frequency domain equalization system avoids the peak-to-average ratio problem introduced by the OFDM system, so that the requirements of communication attack and defense are obviously reduced, and the transmission power consumption is reduced. Compared with the OFDM system, SC-FDE reduces the sensitivity of the system to frequency offset; from the perspective of frequency selective fading, the system receiver of SC-FDE uses channel estimation and equalization technology, and its performance is similar to that of the OFDM system, which makes up for the shortcomings of the OFDM technology and becomes a competitive solution for high-speed wireless communication systems. However, the wireless communication system of the commonly used SC-FDE communication waveform has the technical problem of low utilization rate of communication waveform in the low-variable-rate application scenario facing some fixed service rate or less service rate change. SUMMARY

[0003] In view of the problems in the above-mentioned traditional method, the application provides a low-variable-rate wireless communication system based on an SC-FDE waveform and a low-variable-rate wireless communication method based on an SC-FDE waveform, which can improve the overall communication waveform utilization rate in a low-variable-rate application scenario.

[0004] In order to achieve the above-mentioned purpose, the embodiments of the application adopt the following technical solutions:

[0005] On the one hand, a low-variable-rate wireless communication system based on an SC-FDE waveform is provided, which comprises a transmitting end and a receiving end. The transmitting end comprises a data segment modulation module and a framing module. The input end of the data segment modulation module is used for accessing uplink service data. The output end of the data segment modulation module is connected to the input end of the framing module. The output end of the framing module is connected to a transmitting antenna. The receiving end comprises a data segment demodulation module. The input end of the data segment demodulation module is connected to the receiving antenna through a receiving front end. The output end of the data segment demodulation module is used for outputting downlink service data. There is no signaling segment data in the SC-FDE communication waveform frame structure of the low-variable-rate wireless communication system.

[0006] In one of the embodiments, the low variable rate wireless communication system transmits the control parameters of the next frame to the receiver one frame in advance; the control parameters of the next frame are used to instruct the receiver to automatically adjust the code rate and modulation mode of the decoding when the next frame signal arrives, and to parse the next frame signal according to the adjusted code rate and modulation mode.

[0007] In another aspect, a low variable rate wireless communication method based on SC-FDE waveform is also provided, which is applied to a low variable rate wireless communication system based on SC-FDE waveform, the low variable rate wireless communication system comprises a transmitting end and a receiving end, the transmitting end comprises a data segment modulation module and a framing module, an input end of the data segment modulation module is used to access uplink service data, an output end of the data segment modulation module is connected to an input end of the framing module, and an output end of the framing module is connected to a transmitting antenna; the receiving end comprises a data segment demodulation module, an input end of the data segment demodulation module is connected to the receiving antenna through a receiving front end, and an output end of the data segment demodulation module is used to output downlink service data; and the low variable rate wireless communication system does not have a signaling segment in the SC-FDE communication waveform frame structure.

[0008] The low variable rate wireless communication method based on SC-FDE waveform comprises the following steps:

[0009] The low variable rate wireless communication method based on SC-FDE waveform comprises the following steps:

[0010] Initialization configuration of the low variable rate wireless communication system is performed;

[0011] The data segment modulation module performs BPSK modulation at a code rate of 1 / 3 and then performs service data modulation;

[0012] The framing module frames the data output by the data segment modulation module and then sends the data to the transmitting antenna for transmission.

[0013] In one of the embodiments, the low variable rate wireless communication method based on SC-FDE waveform further comprises the following steps:

[0014] If the low variable rate wireless communication system is not initialized, it is determined whether the control parameters of the low variable rate wireless communication system are changed;

[0015] If the control parameters of the low variable rate wireless communication system are not changed, the data segment modulation module performs service data modulation according to the current control parameters.

[0016] In one of the embodiments, the low variable rate wireless communication method based on SC-FDE waveform further comprises the following steps:

[0017] If the control parameters of the low variable rate wireless communication system are changed, the data segment modulation module modulates the service data according to the changed control parameters, and then the framing module frames.

[0018] In one embodiment, the low variable rate wireless communication system transmits the control parameters of the next frame to the receiver one frame in advance; the control parameters of the next frame are used to instruct the receiver to automatically adjust the code rate and modulation mode of decoding when the next frame signal arrives, and to parse the next frame signal according to the adjusted code rate and modulation mode.

[0019] One of the above technical solutions has the following advantages and beneficial effects:

[0020] The low variable rate wireless communication system and method based on the SC-FDE waveform improve the transceiver link of the system, so that the transmission link of the system includes the data segment modulation module and the framing module, and there is no signaling segment modulation module, the receiving link includes the data segment demodulation module and there is no signaling segment demodulation module, and the redundant signaling segment modulation / demodulation module in the overall framework is removed, thereby improving the overall communication waveform utilization rate of the system, and the frame length is shorter or the rate is higher compared with the conventional technology. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings needed to be used in the embodiments or conventional technology description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a schematic diagram of the overall architecture of the transceiver link of the existing SC-FDE communication waveform;

[0023] Figure 2 It is a schematic diagram of the frame structure of the existing SC-FDE communication waveform;

[0024] Figure 3 It is a schematic diagram of the signal segment structure;

[0025] Figure 4 It is a schematic diagram of the overall architecture of the communication waveform transceiver link in the low variable rate wireless communication system based on the SC-FDE waveform in one embodiment;

[0026] Figure 5 It is a schematic diagram of the optimized SC-FDE communication waveform frame structure in one embodiment;

[0027] Figure 6 It is a schematic diagram of the optimized SC-FDE communication waveform transmission process in one embodiment;

[0028] Figure 7 Flow chart of a low rate wireless communication method based on SC-FDE waveform in an embodiment. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0030] It should be noted that the reference to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase is shown at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments. Those skilled in the art can understand that the embodiments described herein can be combined with other embodiments. The term "and / or" used in the specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0031] The embodiments of the present application will be described in detail below with reference to the accompanying drawings of the embodiments of the present application.

[0032] The overall framework of the transceiver link, the frame structure of the communication waveform and the signal segment structure of the commonly used SC-FDE communication waveform are shown in Figure 1 , Figure 2 and Figure 3 It can be seen from Figure 1 that the transmit link framework of the existing SC-FDE communication waveform mainly includes three modules, i.e. a signaling segment modulation module, a data segment modulation module and a framing module, and the receive link framework mainly includes a signaling segment demodulation module and a data segment demodulation module. The signaling segment modulation module mainly modulates the control information of the communication waveform frame, such as modulation mode, code rate and load length. The data segment modulation module is mainly used for modulating the service load. The framing module mainly performs framing operation on the data of the modulated signaling segment and data segment according to the frame format in Figure 2 to form a complete frame of signals.

[0033] In the existing commonly used frame structure, a signal segment is needed to carry the control information of the frame, otherwise the receiver will not be able to correctly parse the frame; meanwhile, the signal segment adopts a fixed modulation order lower BPSK (Binary Phase Shift Keying) mapping mode for mapping, which is not only low in transmission efficiency but also low in spectrum utilization rate.

[0034] The existing SC-FDE communication waveform framework can realize dynamic conversion of different rates, but in some low variable rate application scenarios such as voice communication application environment or remote control application environment where the service rate is fixed or the service rate changes little, the existing SC-FDE communication waveform framework can meet the needs, but the signaling segment module in the overall framework is redundant. In order to improve the utilization rate of the overall communication waveform, that is, under the condition of meeting the same service information throughput rate or under the condition of meeting the same frame length, the present application designs a shorter frame length or higher rate SC-FDE communication waveform and the corresponding transmission system.

[0035] In one embodiment, as shown in Figure 4 , a low variable rate wireless communication system based on SC-FDE waveform is provided, including a transmitting end and a receiving end, the transmitting end including a data segment modulation module and a framing module, the input end of the data segment modulation module being used to access uplink service data, the output end of the data segment modulation module being connected to the input end of the framing module, the output end of the framing module being connected to a transmitting antenna, the receiving end including a data segment demodulation module, the input end of the data segment demodulation module being connected to the receiving antenna through a receiving front end, the output end of the data segment demodulation module being used to output downlink service data; the SC-FDE communication waveform frame structure of the low variable rate wireless communication system has no signaling segment data.

[0036] For understanding, in the system of the present embodiment, it can be seen from Figure 4 that the transceiving link framework structure of the SC-FDE communication waveform designed in the present embodiment mainly includes two modules of a data segment modulation module and a framing module at the transmitting end, and correspondingly, the receiving end mainly includes a data segment demodulation module for performing demodulation processing opposite to the data segment modulation module on the received data. The data segment modulation module mainly modulates service load, and the framing module mainly performs framing operation on the modulated data segment according to the frame format in Figure 5 to form a complete frame signal.

[0037] The low variable rate wireless communication system based on the SC-FDE waveform improves the transceiving link of the system, so that the transmitting link of the system comprises a data segment modulation module and a framing module, and does not comprise a signaling segment modulation module, the receiving link comprises a data segment demodulation module, and does not comprise a signaling segment demodulation module, thereby removing the redundant signaling segment modulation / demodulation module in the overall framework, improving the overall communication waveform utilization rate of the system, and being shorter in frame length or higher in rate compared with the conventional technology.

[0038] Compared with the conventional technology, the communication waveform is designed to be shorter in frame length or higher in rate, thereby improving the service communication efficiency. Under the condition of the same service data amount and modulation mode, the SC-FDE communication waveform improves the communication rate by 20.9% in the low variable rate application scenario.

[0039] In one embodiment, the low variable rate wireless communication system transmits the control parameters of the next frame to the receiver one frame in advance; the control parameters of the next frame are used to instruct the receiver to automatically adjust the code rate and the modulation mode of decoding when the next frame signal arrives, and to parse the next frame signal according to the adjusted code rate and modulation mode.

[0040] It can be understood that, in order to realize the adjustable communication rate, the modulation mode, the code rate and other control parameter information of the next frame are transmitted to the receiver as service information one frame in advance in the design. After the receiver parses the control information, the next frame automatically adjusts the code rate and the modulation mode of decoding, and then correctly parses the next frame signal. The working process can be as follows: Figure 6

[0041] First, the system is initialized and configured. The data segment modulation module modulates the service data after BPSK modulation at a code rate of 1 / 3, and then performs framing and transmission. If the initialization and configuration are not performed, it is determined whether the control parameters of the system are changed, for example, whether the modulation mode, the code rate and the load length are changed. If not, the data segment modulation module normally modulates the service data. If yes, the data segment modulation module modulates the service data according to the changed control parameters, and then the framing module performs framing.

[0042] ​BPSK (Binary Phase Shift Keying) is a phase shift keying modulation technique that transmits information by converting binary data into phase changes. In BPSK, a 0 bit is mapped to a 0 phase, while a 1 bit is mapped to a 180 phase. This modulation method uses a reference sine wave and a phase-inverted wave, with one side being 0 and the other side being 1, so that 2-value (1-bit) information can be transmitted simultaneously. The principle of BPSK modulation is based on the change in phase. When the input binary signal is 0, the carrier signal maintains the original phase; when the binary signal is 1, the phase of the carrier signal is inverted by 180 degrees. This change in phase represents different data values. At the receiving end, the original binary data can be recovered by demodulating the received signal.

[0043] It should be noted that the internal specific structure and composition of each module in the transmitting end and the receiving end in the low variable rate wireless communication system based on the SC-FDE waveform, as well as other existing components such as the transmitting / receiving antenna in the transceiver link, can be understood in the same way as the same components in the existing SC-FDE communication waveform framework in the art, and will not be described in detail in this specification.

[0044] In one embodiment, as shown in Figure 7 A low variable rate wireless communication method based on an SC-FDE waveform is provided, which is applied to a low variable rate wireless communication system based on an SC-FDE waveform. The low variable rate wireless communication system includes a transmitting end and a receiving end. The transmitting end includes a data segment modulation module and a framing module. The input end of the data segment modulation module is used to access the uplink service data. The output end of the data segment modulation module is connected to the input end of the framing module. The output end of the framing module is connected to the transmitting antenna. The receiving end includes a data segment demodulation module. The input end of the data segment demodulation module is connected to the receiving antenna through a receiving front end. The output end of the data segment demodulation module is used to output the downlink service data. The SC-FDE communication waveform frame structure of the low variable rate wireless communication system does not have a signaling segment.

[0045] The low variable rate wireless communication method based on the SC-FDE waveform can include the following processing steps S10 to S14:

[0046] The low variable rate wireless communication method based on the SC-FDE waveform includes the following steps:

[0047] S10, performing initialization configuration of the low variable rate wireless communication system;

[0048] S12, the data segment modulation module modulates the service data after BPSK modulation at a code rate of 1 / 3;

[0049] S14, the framing module frames the data outputted by the data segment modulation module and sends the framed data to the transmitting antenna.

[0050] The low variable rate wireless communication method based on the SC-FDE waveform improves the transceiving link of the system, so that the transmitting link of the system comprises the data segment modulation module and the framing module, and does not comprise the signaling segment modulation module, the receiving link comprises the data segment demodulation module, and does not comprise the signaling segment demodulation module, thereby removing the redundant signaling segment modulation / demodulation module in the overall framework, improving the overall communication waveform utilization rate of the system, and being shorter in frame length or higher in rate compared with the conventional technology.

[0051] Compared with the conventional technology, the communication waveform is designed to be shorter in frame length or higher in rate, thereby improving the service communication efficiency. Under the condition of the same service data amount and modulation mode, the SC-FDE communication waveform improves the communication rate by 20.9% in the low variable rate application scenario.

[0052] In one embodiment, the low variable rate wireless communication method based on the SC-FDE waveform can further comprise the following steps:

[0053] If the low variable rate wireless communication system is not initialized, it is determined whether the control parameter of the low variable rate wireless communication system is changed. If the control parameter of the low variable rate wireless communication system is not changed, the data segment modulation module modulates the service data according to the current control parameter.

[0054] It can be understood that, in the system working process, if the low variable rate wireless communication system based on the SC-FDE waveform is not initialized, it means that the control parameter configuration in the transceiving link is not changed. At this time, in order to ensure that the subsequent data transmission service can be normally executed, it is necessary to first determine whether the control parameter of the system is changed, for example, the system can be checked or manually inquired, and if the control parameter of the system is not changed, it means that the current control parameter can be used for service data modulation, and the receiver can also ensure the correct analysis of the frame signal received subsequently.

[0055] In one embodiment, the low variable rate wireless communication method based on the SC-FDE waveform can further comprise the following steps:

[0056] If the control parameter of the low variable rate wireless communication system is changed, the data segment modulation module modulates the service data according to the changed control parameter, and then the framing module frames the data.

[0057] It can be understood that if the control parameters of the system are changed, it means that the current control parameters cannot be used to modulate the service data, and the control parameters of the system need to be updated to the latest, so as to ensure the correct analysis of the receiver to the next received frame signal.

[0058] In one embodiment, the low variable rate wireless communication system transmits the control parameters of the next frame to the receiver one frame in advance; the control parameters of the next frame are used to instruct the receiver to automatically adjust the code rate and modulation mode of decoding when the next frame signal arrives, and to analyze the next frame signal according to the adjusted code rate and modulation mode.

[0059] It can be understood that by transmitting the modulation mode, code rate and other control parameter information of the next frame as service information to the receiver one frame in advance, the receiver automatically adjusts the code rate and modulation mode of decoding after analyzing the control information, and then correctly analyzes the next frame signal, realizing the adjustable communication rate of the system.

[0060] It can be understood that the specific limitations of the low variable rate wireless communication method based on the SC-FDE waveform can be referred to the corresponding limitations of the low variable rate wireless communication system based on the SC-FDE waveform in the above, which will not be repeated here.

[0061] It should be understood that although Figure 7 each step is displayed in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise stated herein, the execution of these steps has no strict order limitation, and these steps can be executed in other orders. Moreover, Figure 7 at least part of the steps of may include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be alternately executed with other steps or sub-steps or stages of other steps.

[0062] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, database or other medium used in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus dynamic random access memory (Rambus DRAM, RDRAM for short) and interface dynamic random access memory (DRDRAM).

[0063] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0064] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the protection scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A low variable rate wireless communication system based on SC-FDE waveform, characterized in that: It includes a transmitting end and a receiving end, the transmitting end includes a data segment modulation module and a framing module, the input end of the data segment modulation module is used to access uplink business data, the output end of the data segment modulation module is connected to the input end of the framing module, the output end of the framing module is connected to the transmitting antenna, the receiving end includes a data segment demodulation module, the input end of the data segment demodulation module is connected to the receiving antenna through the receiving front end, and the output end of the data segment demodulation module is used to output downlink business data; the SC-FDE communication waveform frame structure of the low variable rate wireless communication system does not contain signaling segment data.

2. The low variable rate wireless communication system based on SC-FDE waveform according to claim 1, characterized in that The low variable rate wireless communication system transmits the control parameters of the next frame to the receiver one frame in advance; the control parameters of the next frame are used to instruct the receiver to automatically adjust the decoding bit rate and modulation method when the next frame signal arrives, and parse the next frame signal according to the adjusted bit rate and modulation method.

3. A low variable rate wireless communication method based on SC-FDE waveform, characterized in that: The invention is applied to a low-rate wireless communication system based on an SC-FDE waveform. The low-rate wireless communication system includes a transmitting end and a receiving end. The transmitting end includes a data segment modulation module and a framing module. The input end of the data segment modulation module is used to access uplink service data. The output end of the data segment modulation module is connected to the input end of the framing module. The output end of the framing module is connected to a transmitting antenna. The receiving end includes a data segment demodulation module. The input end of the data segment demodulation module is connected to a receiving antenna through a receiving front end. The output end of the data segment demodulation module is used to output downlink service data. The SC-FDE communication waveform frame structure of the low-rate wireless communication system does not contain signaling segment data. The low variable rate wireless communication method based on the SC-FDE waveform comprises the following steps: Performing initialization configuration of the low variable rate wireless communication system; The data segment modulation module performs BPSK modulation at a code rate of 1 / 3 and then performs service data modulation; The framing module frames the data output after modulation by the data segment modulation module and sends the data to the transmitting antenna for transmission.

4. The low variable rate wireless communication method based on SC-FDE waveform according to claim 3, characterized in that: Also includes the steps: If the low variable rate wireless communication system has not been initialized and configured, determining whether a control parameter of the low variable rate wireless communication system has been changed; If the control parameters of the low variable rate wireless communication system have not changed, the data segment modulation module performs service data modulation according to the current control parameters.

5. The low variable rate wireless communication method based on SC-FDE waveform according to claim 4, characterized in that: Also includes the steps: If the control parameters of the low variable rate wireless communication system are changed, the data segment modulation module modulates the service data according to the changed control parameters, and then the framing module performs framing.

6. The low variable rate wireless communication method based on SC-FDE waveform according to any one of claims 3 to 5, characterized in that: The low variable rate wireless communication system transmits the control parameters of the next frame to the receiver one frame in advance; the control parameters of the next frame are used to instruct the receiver to automatically adjust the decoding bit rate and modulation method when the next frame signal arrives, and parse the next frame signal according to the adjusted bit rate and modulation method.

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