Method and device for determining cyclic prefix length of cooperative diversity transmission in wireless ad hoc network

Abstract

The present invention provides a method and device for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network, including: obtaining the maximum tolerable interference energy value of a useful signal and the energy value of the useful signal; determining the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determining the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal. The length of the cyclic prefix CP determined by the present invention can take into account both transmission efficiency and inter-symbol interference, that is, improve spectrum utilization while eliminating inter-symbol interference.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a method and device for determining a cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network. Background Art

[0002] Collaborative diversity transmission: that is, by sharing antennas between multiple collaborative nodes to construct a "virtual multi-antenna array", based on distributed transmission and collaborative signal processing, the channel capacity is improved, a certain spatial diversity gain is obtained, and to a certain extent, channel fading is overcome and the reliability of transmission is enhanced.

[0003] There are different transmission delays when the cooperative node transmits diversity information to the destination node. If it is not processed, inter-symbol interference will occur. The inter-symbol interference can be eliminated by adding a cyclic prefix (CP).

[0004] However, the length of the traditionally added CP is the transmission delay difference between the cooperative nodes, which can eliminate inter-symbol interference but seriously affects the spectrum utilization. Summary of the invention

[0005] In view of the problems existing in the prior art, an embodiment of the present invention provides a method and device for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network.

[0006] In a first aspect, an embodiment of the present invention provides a method for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network, comprising:

[0007] Obtain the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal;

[0008] Determine the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal;

[0009] The length of the cyclic prefix CP is determined based on the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal.

[0010] Further, the determining the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the energy difference between the maximum tolerable interference energy of the useful signal and the useful signal specifically includes:

[0011] Based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the ITM transmission distance attenuation model.

[0012] Further, the useful signal includes the received data of the first relay node and the data after the second relay node adds phase rotation;

[0013] Correspondingly, the energy value of the useful signal is the energy value corresponding to the data received by the first relay node and the data after adding phase rotation by the second relay node.

[0014] Further, interference includes inter-symbol interference and inter-subcarrier interference;

[0015] Correspondingly, the maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference.

[0016] Furthermore, the maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference, specifically including:

[0017] The interference energy is derived based on the inter-symbol interference and the inter-subcarrier interference to determine the maximum tolerable interference energy value of the useful signal.

[0018] In a second aspect, an embodiment of the present invention provides a device for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network, comprising:

[0019] An acquisition module, used to acquire a maximum tolerable interference energy value of a useful signal and an energy value of the useful signal;

[0020] A first determination module, configured to determine a difference between a maximum tolerable interference energy of a useful signal and an energy of the useful signal based on a maximum tolerable interference energy value of the useful signal and an energy value of the useful signal;

[0021] The second determination module is used to determine the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal.

[0022] Furthermore, the second determining module is specifically configured to:

[0023] Based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the ITM transmission distance attenuation model.

[0024] Further, the useful signal includes the received data of the first relay node and the data after the second relay node adds phase rotation;

[0025] Correspondingly, the energy value of the useful signal in the acquisition module is the energy value corresponding to the data received by the first relay node and the data after adding phase rotation by the second relay node.

[0026] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for determining the cyclic prefix length of collaborative diversity transmission in a wireless ad hoc network as described in the first aspect above are implemented.

[0027] In a fourth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network as described in the first aspect above.

[0028] It can be known from the above technical scheme that the method and device for determining the cyclic prefix length of cooperative diversity transmission in wireless ad hoc networks provided in the embodiments of the present invention obtain the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determine the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determine the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal. The length of the cyclic prefix CP determined by the present invention can take into account both transmission efficiency and inter-symbol interference, that is, improve spectrum utilization while eliminating inter-symbol interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic flow chart of a method for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram showing a comparison between the cooperative diversity provided by an embodiment of the present invention and an existing transmission scheme;

[0032] Figure 3 A schematic diagram of a cooperative diversity transmission system model provided by an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of FFT transformation from a cooperative relay node to a destination node provided by an embodiment of the present invention;

[0034] Figure 5A schematic diagram of a simulation of the effect of different interference power values ​​on demodulation performance provided by an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of path attenuation at different transmission distances provided by an embodiment of the present invention;

[0036] Figure 7 A schematic diagram of the structure of a device for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network provided by an embodiment of the present invention;

[0037] Figure 8 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network provided by the present invention will be explained and illustrated in detail through specific embodiments.

[0039] Figure 1 A flow chart of a method for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network provided by an embodiment of the present invention; Figure 1 As shown, the method includes:

[0040] Step 101: Obtain the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal.

[0041] In this step, it should be noted that the useful signal is the data sent by the transmitter on a certain subcarrier of a certain symbol to be recovered; the interference signal is the energy interference of other symbols and other subcarriers on a certain subcarrier of a certain symbol, such as the received data of the first relay node and the data after phase rotation is added by the second relay node.

[0042] Step 102: Determine a difference between a maximum tolerable interference energy of a useful signal and an energy of the useful signal based on a maximum tolerable interference energy value of the useful signal and an energy value of the useful signal.

[0043] Step 103: Determine the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal.

[0044] In this step, it can be understood that, based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the ITM transmission distance attenuation model; based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the Hata model, etc.

[0045] In this embodiment, it should be noted that the wireless ad hoc network is a multi-hop wireless network. The wireless ad hoc network needs to meet the transmission requirements of different services under a certain bandwidth, but the signal transmission environment is complex and there are human interference and natural interference. Therefore, in order to overcome the shortage of wireless resources and the influence of interference fading of wireless channels, it is necessary to seek new technologies to further expand channel capacity and improve communication quality. In order to achieve this goal, the physical layer signal processing technology mainly includes advanced signal processing technology, coding and modulation technology for wireless environment, detection technology and various diversity technologies. Among them, diversity technology can be used to transmit multiple signal samples at the transmitting end and merge multiple signal samples that have experienced independent fading at the receiving end, thereby combating fading and interference in the wireless channel and improving the receiving performance.

[0046] Common diversity methods include time diversity, frequency diversity and space diversity. Among them, time diversity is non-simultaneous transmission on the same frequency, frequency diversity is simultaneous non-co-frequency transmission, and space diversity technology is more attractive because it does not occupy additional time and bandwidth resources and is easy to combine with other diversity methods. In addition to Multiple-Input Multi-Output (MIMO) space diversity, a new space diversity method - collaborative diversity, can further increase the reliability of transmission on the basis of MIMO. The basic idea of ​​collaborative diversity is to construct a "virtual multi-antenna array" by sharing antennas and other network resources among multiple nodes, and to obtain a certain spatial gain through distributed simultaneous co-frequency processing to generate collaboration, so that collaborative nodes can obtain higher transmission rates and communication performance than non-cooperative nodes. Such as Figure 2As shown in the figure, in the traditional transmission scheme, the source node S is transmitted to the destination node D through a single path R1. In the cooperative diversity, the signal of the source node S is transmitted through the relay nodes R1 and R2. The R1 and R2 nodes transmit the same signal to the D node, and the D node performs diversity combination to generate gain. When multiple cooperative nodes transmit diversity information to the destination node, due to the different distances from different nodes to the destination node, there are different transmission delays. If not processed, the transmitted information will cause inter-symbol interference. Inter-symbol interference can be eliminated by adding a cyclic prefix (CP), but the selection of CP length is the key. If the CP length is too long, the information transmission efficiency is reduced. If the CP length is too short, it is difficult to eliminate inter-symbol interference. The traditional added CP length is the transmission delay difference between the cooperative nodes. Although it eliminates inter-symbol interference, it affects the spectrum utilization.

[0047] In order to balance transmission efficiency and inter-symbol interference, the embodiment of the present invention starts with the transmission power distance attenuation of cooperative nodes and proposes a method for determining the cyclic prefix length of cooperative diversity transmission in wireless ad hoc networks.

[0048] The cooperative diversity transmission system model is as follows: Figure 3 As shown in Figure 1, the source node S initiates data transmission, and the relay nodes R1 and R2 forward the source node data to the destination node D. In order to reduce the number of CPs used, OFDM modulation is generally used. Due to the different transmission distances, the OFDM symbols when arriving at the destination node are as follows: Figure 4 As shown in the figure, when the CP length is insufficient, according to the synchronous timing position information, the FFT starting point of the destination node is consistent with the FFT starting point of the cooperative relay node 1. Due to the transmission delay difference, the accurate FFT starting point of the cooperative relay node 2 is located after the current FFT starting point. For the cooperative relay node 1, the time domain data vector before FFT after reaching the destination node is {x i，0 , x i，2 ,...,x i,M-1}, where M is the FFT length; for cooperative relay node 2, the data vector before FFT after reaching the destination node is {x i-1,M-(d-L) ,...,x i-1,M-1， x i，M-L ,...,x i，M-1 ,x i，0 ,...,x i，M-d-1}, where d is the FFT starting point deviation between cooperative relay node 2 and cooperative relay node 1, and L is the CP length. When the CP length is insufficient, d>L.

[0049] In an embodiment of the present invention, starting from the transmission power attenuation of the cooperative node, when a certain node exceeds a certain distance range and it is considered that the power reaching the destination node is small, its transmission delay is not considered, and the energy upper limit of the interfering node is derived, and the CP length is obtained according to the maximum transmission distance difference corresponding to the maximum tolerable interference energy value of the receiving node and the energy value of the useful signal (that is, the length of the cyclic prefix CP is determined based on the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal). The length of the cyclic prefix CP determined by the present invention can take into account both transmission efficiency and inter-symbol interference, that is, improve spectrum utilization while eliminating inter-symbol interference. Preferably, through the cyclic prefix length determination method for cooperative diversity transmission of wireless ad hoc networks provided by an embodiment of the present invention, the determined length of the cyclic prefix CP can be used to reduce the CP length determined by the traditional method (that is, the method that does not consider the capacity impact between different cooperative nodes), thereby improving the transmission efficiency of cooperative diversity.

[0050] In order to better understand the present invention, the content of the present invention is further described below in conjunction with the embodiments, but the present invention is not limited to the following embodiments.

[0051] Specifically, see Figure 5 The simulation diagram and Figure 6 Schematic diagram of path attenuation under different transmission distances provided: Figure 5 The simulation of different energy differences when nodes R1 and R2 reach node D is given, where: Figure 5 The horizontal axis SNR is the signal-to-noise ratio, the vertical axis BER is the bit error rate, and the simulation conditions are 1 / 2Turbo (Turbo soft coding, code rate is 1 / 2), QPSK modulation, EVA multipath channel. It can be seen from the simulation that when the interference energy caused by node R2 is 10dB lower than the energy of the useful signal, the demodulation performance of the destination node D is almost lossless, when the interference energy caused by node R2 is 8dB lower than the energy of the useful signal, the demodulation performance loss of the destination node D is about 0.5dB, when the interference energy caused by node R2 is 6dB lower than the energy of the useful signal, the demodulation performance loss of the destination node D is about 2dB, and -6dB can be regarded as the maximum tolerable difference between the interference energy and the useful signal energy (that is, the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal are determined based on the useful signal The difference between the useful signal and the useful signal). Figure 6The figure shows the link attenuation at different transmission distances at a frequency of 900MHz in a medium fluctuation environment. According to the demodulation performance simulation of the destination node D, when the interference energy caused by node R2 is 6dB lower than the energy of the useful signal, the demodulation performance of node C loses 2dB, which is the maximum tolerable difference between the interference energy and the useful signal energy. When the transmission distance of 1 / 2Turbo+QPSK modulation is 15km, the CP length caused by the transmission delay is the maximum distance difference covered by the difference of 6dB between the interference energy and the useful signal energy. Figure 6 It can be concluded that if the distance difference is 5 km, then the CP length is 16.67 us (the CP length calculation formula is transmission distance / speed of light. When the transmission distance is 5 km, the CP length is 16.67 us). In the traditional way, the energy impact between different cooperative nodes is not considered. The CP length is the transmission delay difference of the cooperative nodes, that is, 50 us. It can be seen that this embodiment starts from the transmission power distance attenuation of the cooperative node, and can reduce the CP length to 16.67 us, thereby improving the transmission efficiency of cooperative diversity.

[0052] It can be seen from the above technical scheme that the method for determining the cyclic prefix length of wireless ad hoc network cooperative diversity transmission provided by the embodiment of the present invention obtains the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determines the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determines the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal. The length of the cyclic prefix CP determined by the present invention can take into account both transmission efficiency and inter-symbol interference, that is, improve spectrum utilization while eliminating inter-symbol interference.

[0053] On the basis of the above embodiment, in this embodiment, determining the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the energy difference between the maximum tolerable interference energy of the useful signal and the useful signal specifically includes:

[0054] Based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the ITM transmission distance attenuation model.

[0055] In this embodiment, with respect to the ITM transmission distance attenuation model, it should be noted that: the ITM transmission distance attenuation model evaluates the link transmission loss from multi-dimensional environmental parameters based on the link loss model in traditional wireless mobile communications, which is closer to the real environment than the Okumura-Hata empirical formula; the ITM transmission distance attenuation model is applicable to a frequency range of 20 MHz to 2.5 GHz, an antenna height range of 0.5 m to 300 m, and a communication distance of more than 1 m.

[0056] It can be seen from the above technical solution that the method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network provided in an embodiment of the present invention adopts the ITM transmission distance attenuation model to determine the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal, which is conducive to being closer to the real environment, thereby making the result more accurate.

[0057] On the basis of the above embodiment, in this embodiment, the useful signal includes the received data of the first relay node and the data after the second relay node adds phase rotation;

[0058] Correspondingly, the energy value of the useful signal is the energy value corresponding to the data received by the first relay node and the data after adding phase rotation by the second relay node.

[0059] On the basis of the above embodiment, in this embodiment, the interference includes inter-symbol interference and inter-subcarrier interference;

[0060] Correspondingly, the maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference.

[0061] In order to better understand the present invention, the content of the present invention is further described below in conjunction with the embodiments, but the present invention is not limited to the following embodiments.

[0062] For example, the method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network provided by an embodiment of the present invention is as follows:

[0063] Step 1: Data processing within the received signal window. Perform FFT transformation on the received data to obtain the recovered data of the kth subcarrier of the i-th OFDM symbol:

[0064]

[0065] Wherein, M is the number of subcarriers, P1 is the power of data from cooperative relay node 1 to the destination node, and P2 is the power of data from cooperative relay node 2 to the destination node. is the data in the FFT window of relay node 1, is the data in the FFT window of relay node 2, and N(k) is the noise. Substituting the data in the window into the transformation, we can get:

[0066]

[0067] Step 2: Receive signal and interference conversion. Perform FFT conversion on the data in the window and simplify it to get:

[0068]

[0069] Rearranging the above formula yields

[0070]

[0071] Further transformation of the above received signal can be obtained:

[0072]

[0073] The above formula is converted into the form of useful signal and interference:

[0074]

[0075] Among them, the first item is the useful signal, which includes the received data of relay node 1 and the data after phase rotation added by relay node 2, which can be compensated by channel estimation; the second item is interference, including inter-symbol interference and inter-subcarrier interference; the third item is the noise item.

[0076] Step 3: Derivation of interference energy. Interference can be approximated as Gaussian noise, and its power is:

[0077]

[0078] Based on dL<M, the upper limit of the above interference energy is:

[0079]

[0080] Step 4: Determine the CP length. Based on the received useful signal energy and interference energy values, the impact of different interference signal strengths on the useful signal under the transmission rate range is obtained through simulation, that is, the maximum tolerable interference energy and useful signal energy difference of the useful signal is obtained. Then, combined with the transmission distance of the transmission rate range, according to the ITM transmission distance attenuation model, the CP length can be determined as the maximum transmission distance difference corresponding to the maximum tolerable interference energy and useful signal energy difference.

[0081] It can be seen from the above technical solutions that the method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network provided by the embodiment of the present invention can take into account both transmission efficiency and inter-symbol interference, that is, improve spectrum utilization while eliminating inter-symbol interference.

[0082] On the basis of the above embodiment, in this embodiment, the maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference, specifically including:

[0083] The interference energy is derived based on the inter-symbol interference and the inter-subcarrier interference to determine the maximum tolerable interference energy value of the useful signal.

[0084] In this embodiment, it can be understood that the maximum tolerable interference energy value of the useful signal is determined by using the law of large numbers to derive the interference energy based on the inter-symbol interference and the inter-subcarrier interference.

[0085] It can be seen from the above technical solution that the method for determining the cyclic prefix length of wireless ad hoc network cooperative diversity transmission provided in an embodiment of the present invention can determine the maximum tolerable interference energy value of the useful signal by deriving the interference energy based on the interference; thereby determining the cyclic prefix length using the derived maximum tolerable interference energy value of the useful signal.

[0086] Figure 7 A schematic diagram of the structure of a device for determining a cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, the device includes: an acquisition module 201, a first determination module 202 and a second determination module 203, wherein:

[0087] The acquisition module 201 is used to acquire the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal;

[0088] A first determination module 202, configured to determine a difference between a maximum tolerable interference energy of a useful signal and an energy of the useful signal based on a maximum tolerable interference energy value of the useful signal and an energy value of the useful signal;

[0089] The second determination module 203 is configured to determine the length of the cyclic prefix CP based on a maximum transmission distance difference corresponding to a difference between a maximum tolerable interference energy of the useful signal and an energy of the useful signal.

[0090] The cyclic prefix length determination device for cooperative diversity transmission in a wireless ad hoc network provided in an embodiment of the present invention can be specifically used to execute the cyclic prefix length determination method for cooperative diversity transmission in a wireless ad hoc network of the above embodiment. Its technical principles and beneficial effects are similar. Please refer to the above embodiment for details and will not be repeated here.

[0091] Based on the same inventive concept, an embodiment of the present invention provides an electronic device, see Figure 8 The electronic device specifically includes the following contents: a processor 301, a communication interface 303, a memory 302 and a communication bus 304;

[0092] Among them, the processor 301, the communication interface 303, and the memory 302 communicate with each other through the communication bus 304; the communication interface 303 is used to realize information transmission between various modeling software and intelligent manufacturing equipment module libraries and other related equipment; the processor 301 is used to call the computer program in the memory 302, and the processor implements the methods provided by the above-mentioned method embodiments when executing the computer program. For example, when the processor executes the computer program, it implements the following steps: obtaining the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determining the maximum tolerable interference energy of the useful signal and the energy value of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determining the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal.

[0093] Based on the same inventive concept, another embodiment of the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the methods provided by the above-mentioned method embodiments, for example, obtaining the maximum tolerable interference energy value of a useful signal and the energy value of the useful signal; determining the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; determining the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal.

[0094] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on this understanding, the above technical solution, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer,

[0096] Server, or network equipment, etc.) to execute methods of various embodiments or certain parts of the embodiments.

[0097] In addition, in the present invention, terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0098] In addition, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0099] In addition, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network, characterized in that: include: Obtain the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; Determine the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal based on the maximum tolerable interference energy value of the useful signal and the energy value of the useful signal; Determine the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal; The useful signal includes the received data of the first relay node and the data after the second relay node adds phase rotation; Accordingly, the energy value of the useful signal is the energy value corresponding to the data received by the first relay node and the data after adding phase rotation by the second relay node; Interference includes inter-symbol interference and inter-subcarrier interference; Accordingly, the maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference; In the wireless ad hoc network cooperative diversity transmission, a signal of a source node is transmitted to a target node via the first relay node and the second relay node.

2. The method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network according to claim 1, characterized in that: The determining the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal specifically includes: Based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the ITM transmission distance attenuation model.

3. The method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network according to claim 1, characterized in that: The maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference, specifically including: The interference energy is derived based on the inter-symbol interference and the inter-subcarrier interference to determine the maximum tolerable interference energy value of the useful signal.

4. A device for determining cyclic prefix length for cooperative diversity transmission in a wireless ad hoc network, characterized in that: include: An acquisition module, used to acquire a maximum tolerable interference energy value of a useful signal and an energy value of the useful signal; A first determination module, configured to determine a difference between a maximum tolerable interference energy of a useful signal and an energy of the useful signal based on a maximum tolerable interference energy value of the useful signal and an energy value of the useful signal; A second determination module is used to determine the length of the cyclic prefix CP based on the maximum transmission distance difference corresponding to the difference between the maximum tolerable interference energy of the useful signal and the energy of the useful signal; The useful signal includes the received data of the first relay node and the data after the second relay node adds phase rotation; Accordingly, the energy value of the useful signal is the energy value corresponding to the data received by the first relay node and the data after adding phase rotation by the second relay node; Interference includes inter-symbol interference and inter-subcarrier interference; Accordingly, the maximum tolerable interference energy value of the useful signal is the energy value corresponding to the inter-symbol interference and the inter-subcarrier interference; In the wireless ad hoc network cooperative diversity transmission, a signal of a source node is transmitted to a target node via the first relay node and the second relay node.

5. The device for determining cyclic prefix length of cooperative diversity transmission in wireless ad hoc network according to claim 4, characterized in that: The second determining module is specifically used to: Based on the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal, the maximum transmission distance difference corresponding to the maximum tolerable interference energy of the useful signal and the energy difference of the useful signal is determined according to the ITM transmission distance attenuation model.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network as described in any one of claims 1 to 3 is implemented.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining the cyclic prefix length of cooperative diversity transmission in a wireless ad hoc network as described in any one of claims 1 to 3 is implemented.

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