Multi-tone signal sending method and device

Abstract

The embodiment of the invention provides a multi-tone signal sending method and device. The method comprises the steps that a first multi-tone signal is generated, the first multi-tone signal comprises N single-tone signals, the amplitude value of each single-tone signal is the same, the initial phases of at least two single-tone signals in the N single-tone signals are the same, or the absolute values of the initial phases of at least two single-tone signals in the N single-tone signals are the same, and N is an integer larger than or equal to 2; and sending the first multi-tone signal. According to the method disclosed by the invention, the average power of multi-tone signal transmission can be improved, and the transmission distance or the coverage range of the multi-tone signal can be further improved.

Description

[0001] TECHNICAL FIELD This application relates to the field of communications, and more specifically, to a method and apparatus for transmitting multi-tone signals. Background: Currently, the Bluetooth Special Interest Group (Bluetooth SIG) supports Bluetooth protocols for angle of arrival (AoA) and angle of departure (AoD), improving indoor positioning accuracy by utilizing the directional information of Bluetooth low energy (BLE) signals. AoA / AoD and multi-carrier phase difference (MCPD) perform phase measurement by transmitting a single-tone (or single-carrier) signal. These phase measurements can only measure the phase of a single frequency within the entire Industrial Scientific Medical (ISM) band, resulting in a long time required to complete measurements across the entire band. Using multi-tone signals for phase measurement in AoA / AoD or MCPD ranging can significantly reduce overall measurement time and power consumption. However, given that the power amplifier (PA) of a transmitting device has a certain upper limit, and the peak-to-average power ratio (PAPR) of a multi-tone signal limits the average power of the transmitted multi-tone signal, increasing the average power of the transmitted multi-tone signal is an urgent issue. SUMMARY OF THE INVENTION This application provides a method and apparatus for transmitting multi-tone signals. By designing different initial phases of the multi-tone signals, the average power of the transmitted multi-tone signal can be increased, thereby improving the transmission distance or coverage of the multi-tone signal. In a first aspect, a method for transmitting multi-tone signals is provided. The apparatus can be executed by a receiving device, or by a chip or circuit for the receiving device, although this application does not limit this. For ease of description, the following description uses execution by a receiving device as an example. The method includes: generating a first multi-tone signal, the first multi-tone signal including N single-tone signals, each single-tone signal having the same amplitude value, and at least two of the N single-tone signals having the same initial phase, or at least two of the N single-tone signals having the same absolute value of the initial phase, where N is an integer greater than or equal to 2; and transmitting the first multi-tone signal. According to the solution provided in the present application, by varying the initial phases to design different multi-tone signals, the PAPR of the signal is minimized, thereby increasing the average power of the transmitted multi-tone signal, which is beneficial for improving the transmission distance or coverage of the multi-tone signal.It should be understood that, compared to conventional multi-tone signals whose initial phases are all set to 0 by default, the multi-tone signals provided in this application have an increased average transmission power, thereby increasing the signal transmission distance (or coverage range). For example, if two devices use a multi-tone signal with an initial phase of 0, multi-tone ranging or multi-tone AoA / AoD measurement may not be possible due to the received signal being too weak. For example, if N=4, the initial phases of the first multi-tone signal may be 1.81, 0, 0, and 1.81; alternatively, the initial phases of the first multi-tone signal may be 4.47, 0, 0, and 4.47; further alternatively, the initial phases of the first multi-tone signal may be -0.08, -0.63, 0.63, and 3.70, etc., which are not specifically limited in this application. It should be noted that the unit of phase can be radians or degrees. For ease of understanding, this application uniformly uses radians to represent the initial phase of each single-tone signal in the multi-tone signal. Of course, it is not ruled out that the initial phase can be represented by degrees instead. For the sake of brevity, no further details are given. In one possible implementation, based on the fact that at least two single-tone signals have the same initial phase, the initial phase of each single-tone signal in the first multi-tone signal is increased by the same initial phase Δ◎. That is, each point of each single-tone signal on the IQ plane is rotated counterclockwise by Δ◎, and the corresponding multi-tone signal is also rotated counterclockwise by Δ◎ on the IQ plane. This rotation does not change the amplitude of the multi-tone signal. Therefore, the rotated multi-tone signal can also obtain an optimal PAPR. For example, N=4, the initial phase (p1 = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81)) of each single-tone signal in the first multi-tone signal is rotated counterclockwise by Δcp = 7t / 6 = 0.52, resulting in corresponding initial phases of (p1 = 2.33, (p2 = 0.52, (p3 = 0.52, (p4 = 2.33). It should be understood that the two initial phase combinations correspond to the same PAPR.In another possible implementation, based on the fact that at least two single-tone signals have the same initial phase, each single-tone signal in the first multi-tone signal is shifted on the time axis by Δt, where Δt is an arbitrary value. The corresponding multi-tone signal is also shifted on the time axis by Δt, which is equivalent to increasing the initial phase of each single-tone signal by Δt. This shift does not affect the maximum amplitude of the multi-tone signal, so the shifted multi-tone signal can also obtain an optimal PAPR. For example, N=4, the initial phase of each single-tone signal in the first multi-tone signal (p1 = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81)) is shifted left by Δt = 0.2 on the time axis, resulting in the corresponding initial phases (p1 = -0.08, (p2 = -0.63, (p3 = 0.63, (p4 = 3.70). It should be understood that the two initial phase combinations correspond to the same PAPR. In yet another possible implementation, Based on the fact that the initial phases of at least two single-tone signals are the same, each point of each single-tone signal on the IQ plane is rotated counterclockwise by Δ◎, and each single-tone signal is translated on the time axis. This also does not affect the maximum amplitude of the multi-tone signal. Therefore, the translated multi-tone signal can also obtain the optimal PAPR. It should be noted that the order of rotating and translating the multi-tone signal is not specifically limited. Exemplarily, N=4, the initial phase (p1 = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81) of each single-tone signal in the first multi-tone signal is rotated counterclockwise by Δ (p = 7t / 6 = 0.52 in sequence, and then shifted left by Δt = 0.2|is on the time axis. The PAPR corresponding to the obtained initial phase is the same as the PAPR corresponding to the original initial phase. In combination with the first aspect, in certain implementations of the first aspect, the at least two single-tone signals with the same initial phase are symmetrical about the center frequency point. Exemplarily, N=4, The initial phase (p1) of the first single-tone signal is 1.81, the initial phase (p2) of the second single-tone signal is 0, the initial phase (p3) of the third single-tone signal is 0, and the initial phase (p4) of the fourth single-tone signal is 1.81. Correspondingly, the frequency of the first single-tone signal is -1.5 MHz, the frequency of the second single-tone signal is -0.5 MHz, the frequency of the third single-tone signal is 0.5 MHz, and the frequency of the fourth single-tone signal is 1.5 MHz. That is, the first single-tone signal and the fourth single-tone signal are symmetrical about the center frequency, and the second single-tone signal and the fourth single-tone signal are symmetrical about the center frequency.With reference to the first aspect, in certain implementations of the first aspect, when N=3, the first tone signal and the third tone signal have the same initial phase, the frequency of the first tone signal is the lowest, and the frequency of the third tone signal is the highest. Exemplarily, when N=3, the initial phases of the first tone signal and the third tone signal may be 0, and the initial phase of the second tone signal may be 1.57°. With reference to the first aspect, in certain implementations of the first aspect, when N=4, the first tone signal and the fourth tone signal have the same initial phase, and / or the second tone signal and the third tone signal have the same initial phase, the frequency of the first tone signal is the lowest, the frequency of the fourth tone signal is the highest, and the second tone signal is greater than the first tone signal and less than the third tone signal. Exemplarily, N=4, the frequency of the first single-tone signal is -1.5 MHz, the frequency of the second single-tone signal is -0.5 MHz, the frequency of the third single-tone signal is 0.5 MHz, and the frequency of the fourth single-tone signal is 1.5 MHz. Accordingly, the initial phases of the first single-tone signal and the fourth single-tone signal may be 1.81, and the initial phases of the second single-tone signal and the third single-tone signal may be 0°. In conjunction with the first aspect, in certain implementations of the first aspect, when N=5, the initial phases of the first single-tone signal and the fifth single-tone signal are the same, the initial phases of the second single-tone signal and the fourth single-tone signal are the same, the frequency of the first single-tone signal is the smallest, and the frequency of the fifth single-tone signal is the largest. Exemplarily, when N=5, the initial phases of the first and fifth tone signals may be 1.05, the initial phases of the second and fourth tone signals may be 0, and the initial phase of the third tone signal may be 3.01. In conjunction with the first aspect, in certain implementations of the first aspect, when N=6, the initial phases of the first and sixth tone signals are the same, the initial phases of the second and fifth tone signals are the same, and the initial phases of the third and fourth tone signals are the same. The frequency of the first tone signal is the lowest, and the frequency of the sixth tone signal is the highest. Exemplarily, when N=6, the initial phases of the first and sixth tone signals may be 5.00, the initial phases of the second and fifth tone signals may be 3.67, and the initial phase of the third tone signal may be 0. With reference to the first aspect, in certain implementations of the first aspect, when N=7, the first tone signal and the seventh tone signal have the same initial phase, the second tone signal and the sixth tone signal have the same initial phase, the third tone signal and the fifth tone signal have the same initial phase, the first tone signal has the lowest frequency, and the seventh tone signal has the highest frequency.Exemplarily, N=7, the initial phases of the first single-tone signal and the seventh single-tone signal may be 3.14, the initial phases of the second single-tone signal and the sixth single-tone signal may be 4.71, the initial phases of the third single-tone signal and the fifth single-tone signal may be 0, and the initial phase of the fourth single-tone signal may be 4.71. In combination with the first aspect, in certain implementations of the first aspect, when N=8, one or more of the following is satisfied: the initial phases of the first single-tone signal and the eighth single-tone signal are the same, the initial phases of the second single-tone signal and the seventh single-tone signal are the same, the initial phases of the third single-tone signal and the sixth single-tone signal are the same, or the initial phases of the fourth single-tone signal and the fifth single-tone signal are the same, the frequency of the first single-tone signal is the minimum, the frequency of the eighth single-tone signal is the maximum, the frequency of the third single-tone signal is greater than the frequency of the second single-tone signal and less than the frequency of the fourth single-tone signal, the frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than the frequency of the sixth single-tone signal, and the frequency of the sixth single-tone signal is less than the frequency of the seventh single-tone signal. For example, when N=8, the initial phases of the first and eighth tone signals may be 5.40, the initial phases of the second and seventh tone signals may be 3.84, the initial phases of the third and sixth tone signals may be 0.91, and the initial phases of the fourth and fifth tone signals may be 0. With reference to the first aspect, in certain implementations of the first aspect, when N=4, so that the PAPR of the signal is less than or equal to 2 dB, the initial phases of the corresponding N tone signals satisfy any of the following conditions:

[0002] (p2=(p3=0, 1.59 < (pl < 1.86, (p4 > - (pl + 3.57, JL (p4 < - cp 1*4 / 9 + 2.69;

[0003] (p2=(p3=0, 1.86 < (pl < 1.98, (p4 > - (pl + 3.57, JL (p4 < - (pl*9 / 4 + 6.04;

[0004] (p2=(p3=0, 4.3 < (pl < 4.42, (p4 < - (pl + 8.99, JL (p4 > - (pl*9 / 4 + 14.36 ; or,

[0005] (p2=(p3=0, 4.42 < (pl < 4.69, (p4 < - (pl + 8.99, JL (p4 > - (pl*4 / 9 + 6.38; where, (pl is the initial phase of the first single-tone signal, (p2 is the initial phase of the second single-tone signal, (p3 is the initial phase of the third single-tone signal, and (p4 is the initial phase of the fourth single-tone signal.

[0006] (p2=(p3=0, 2.05 < (pl < 7t, (p4 > - (pl + 7t, JL(p4<-(pl*1.88 + 5.9;

[0007] (p2=(p3=0, 7t < (pl < 4.23, (p4 < - (pl + 9.42, JL(p4>-(pl*1.88 + 12.18; Or,

[0008] (p2=(p3=0, 4.23 < (pl < 2n, (p4 < - (pl + 9.42, JL (p4 > - (pl*0.53 + 6.47 : where, (pl is the initial phase of the first single-tone signal, (p2 is the initial phase of the second single-tone signal, (p3 is the initial phase of the third single-tone signal, and (p4 is the initial phase of the fourth single-tone signal. Combining the first aspect, in some implementations of the first aspect, when N = 4, the PAPR of the signal is less than or equal to 3 dB, and the initial phases of the corresponding N single-tone signals satisfy any of the following:

[0009] (p2=(p3=0, 0 < (pl <2.3, (p4 > - (pl + 2.92, JL (p4 < - (pl*0.46 + 3.36;

[0010] (p2=(p3=0, 2.3 <(pl <2.92, (p4>-(pl +2.92, JL (p4 <- (pl *2.17 + 7.29;

[0011] (p2=(p3=0, 2.92 <(pl <3.36, (p4> 0, JL (p4 <- (pl *2.17 + 7.29;

[0012] (p2=(p3=0, 2.92 <(pl <3.36, (p4 M 2兀, JL (p4 > - (pl*2.17 + 12.62;

[0013] (p2=(p3=0, 3.36 <(pl <3.98, (p4 < - (pl +9.64, JL (p4 >- (pl *2.17 + 12.62; or,

[0014] (p2=(p3=0, 3.98 < (pl < 2K, (p4 <- (pl + 9.64, JL (p4 >- (pl*0.46 + 5.81: wherein, (pl is the initial phase of the first tone signal, (p2 is the initial phase of the second tone signal, (p3 is the initial phase of the third tone signal, and (p4 is the initial phase of the fourth tone signal. With reference to the first aspect, in certain implementations of the first aspect, the frequency intervals between any two adjacent tone signals in the N tone signals are the same. Exemplarily, N=4, the frequency of the first tone signal is -1.5 MHz, the frequency of the second tone signal is -0.5 MHz, the frequency of the third tone signal is 0.5 MHz, and the frequency of the fourth tone signal is 1.5 MHz. Then, the frequency intervals between any two adjacent tone signals in the four tone signals are the same. With reference to the first aspect, in certain implementations of the first aspect, when N=4, The frequency interval between any two adjacent single-tone signals in the N single-tone signals is 1 MHz. For example, N=4, the frequency of the first single-tone signal is -1.5 MHz, the frequency of the second single-tone signal is -0.5 MHz, the frequency of the third single-tone signal is 0.5 MHz, and the frequency of the fourth single-tone signal is 1.5 MHz; or, the frequency of the first single-tone signal is -1 MHz, the frequency of the second single-tone signal is 0 MHz, the frequency of the third single-tone signal is 1 MHz, and the frequency of the fourth single-tone signal is 2 MHz. In combination with the first aspect, in certain implementations of the first aspect, when N=4, the frequency interval between any two adjacent single-tone signals in the N single-tone signals is 2 MHz. For example, N=4, the frequency of the first single-tone signal is -3 MHz, the frequency of the second single-tone signal is -1 MHz, the frequency of the third single-tone signal is 1 MHz, and the frequency of the fourth single-tone signal is 3 MHz. In a second aspect, a device for transmitting a multi-tone signal is provided, comprising: a processing unit for generating a first multi-tone signal, The first multi-tone signal includes N single-tone signals, each single-tone signal having the same amplitude value, and at least two of the N single-tone signals having the same initial phase value, or at least two of the N single-tone signals having the same absolute value of the initial phase value, where N is an integer greater than or equal to 2. The transceiver unit is configured to transmit the first multi-tone signal. With reference to the second aspect, in certain implementations of the second aspect, the at least two single-tone signals having the same initial phase value are symmetrical about a center frequency.With reference to the second aspect, in certain implementations of the second aspect, when N=4, the first tone signal and the fourth tone signal have the same initial phase, and / or the second tone signal and the third tone signal have the same initial phase, the first tone signal has a minimum frequency, the fourth tone signal has a maximum frequency, and the second tone signal is greater than the first tone signal and less than the third tone signal. With reference to the second aspect, in certain implementations of the second aspect, when N=8, one or more of the following conditions are satisfied: the first tone signal and the eighth tone signal have the same initial phase, the second tone signal and the seventh tone signal have the same initial phase, the third tone signal and the sixth tone signal have the same initial phase, or the fourth tone signal and the fifth tone signal have the same initial phase; the frequency of the first tone signal is the lowest, the frequency of the eighth tone signal is the highest, the frequency of the third tone signal is greater than the frequency of the second tone signal and less than the frequency of the fourth tone signal; the frequency of the fifth tone signal is greater than the frequency of the fourth tone signal and less than the frequency of the sixth tone signal, and the frequency of the sixth tone signal is less than the frequency of the seventh tone signal. With reference to the second aspect, in certain implementations of the second aspect, when N=4, so that the PAPR of the signal is less than or equal to 2 dB, the initial phases of the corresponding N tone signals satisfy any one of the following conditions:

[0015] (p2=(p3=0, 1.59<(pl < 1.86, (p4>-(pl +3.57, JL (p4 <- cp 1*4 / 9 + 2.69;

[0016] (p2=(p3=0, 1.86 < (pl < 1.98, (p4 > - (pl + 3.57, JL (p4 < - (pl*9 / 4 + 6.04;

[0017] (p2=(p3=0, 4.3 <(pl <4.42, (p4 < - (pl + 8.99, JL (p4 > - (pl*9 / 4 + 14.36; or,

[0018] (p2=(p3=0, 4.42 < (pl < 4.69, (p4 <- (pl + 8.99, JL (p4 >- (pl*4 / 9 + 6.38; wherein, (pl is the initial phase of the first tone signal, (p2 is the initial phase of the second tone signal, (p3 is the initial phase of the third tone signal, and (p4 is the initial phase of the fourth tone signal. With reference to the second aspect, in certain implementations of the second aspect, when N=4, so that the PAPR of the signal is less than or equal to 2.5 dB, the initial phases of the corresponding N tone signals satisfy any of the following:

[0019] (p2=(p3=0, 0 < (pl < 2.05, (p4 > - (pl + 7t, JL (p4 < - (pl*0.53 + 7t;

[0020] (p2=(p3=0, 2.05 < (pl < 7t, (p4 > - (pl + 7t, JL(p4<-(pl*1.88 + 5.9;

[0021] (p2=(p3=0, 7t < (pl < 4.23, (p4 < - (pl + 9.42, JL(p4>-(pl*1.88 + 12.18; or,

[0022] (p2=(p3=0, 4.23 < (pl < 2n, (p4 < - (pl + 9.42, JL (p4 > - (pl*0.53 + 6.47: wherein, (pl is the initial phase of the first tone signal, (p2 is the initial phase of the second tone signal, (p3 is the initial phase of the third tone signal, and (p4 is the initial phase of the fourth tone signal. In combination with the second aspect, in certain implementations of the second aspect, the PAPR of the signal is less than or equal to 3 dB, and the initial phases of the corresponding N tone signals satisfy

[0023] (p2=(p3=0, 0 < (pl <2.3, (p4 > - (pl + 2.92, JL (p4 3.36;

[0024] (p2=(p3=0, 2.3 <(pl <2.92, (p4>-(pl +2.92, JL (p4 <- (pl *2.17 + 7.29;

[0025] (p2 = (p3 = 0, 2.92 < (p1 < 3.36, (p4 > 0, JL (p4 < - (p1 * 2.17 + 7.29;

[0026] (p2 = (p3 = 0, 2.9 < (p1 < 3.36, (p4 M 2π, JL (p4 > - (p1 * 2.17 + 12.62;

[0027] (p2 = (p3 = 0, 3.36 < (p1 < 3.98, (p4 < - (p1 + 9.64, JL (p4 > - (p1 * 2.17 + 12.62; Or,

[0028] (p2 = (p3 = 0, 3.98 < (p1 < 2π, (p4 < - (p1 + 9.64, JL (p4 > - (p1 * 0.46 + 5.81: Where, (p1 is the initial phase of the first single - tone signal, (p2 is the initial phase of the second single - tone signal, (p3 is the initial phase of the third single - tone signal, and (p4 is the initial phase of the fourth single - tone signal. Combining the second aspect, in some implementations of the second aspect, the frequency interval between any two adjacent single - tone signals among the N single - tone signals is the same. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a structural diagram of an arrival angle positioning system applicable to the present application. Figure 2 is a structural diagram of a departure angle positioning system applicable to the present application. Figure 3 is a schematic diagram of up-converting a baseband multi-tone signal into a radio frequency multi-tone signal according to an embodiment of the present application. Figure 4 is a schematic diagram of a representation of a baseband single-tone signal according to an embodiment of the present application. Figure 5 is a schematic diagram of another representation of a baseband single-tone signal according to an embodiment of the present application. Figure 6 is a flow chart of a multi-tone signal determination apparatus according to an embodiment of the present application. Figures 7 to 9 are schematic diagrams of a multi-tone signal (N=3) design according to an embodiment of the present application. Figures 10 to 13 are schematic diagrams of a multi-tone signal (N=4) design according to an embodiment of the present application. Figures 14 to 16 are schematic diagrams of a multi-tone signal (N=5) design according to an embodiment of the present application. Figures 17 to 19 are schematic diagrams of a multi-tone signal (N=6) design according to an embodiment of the present application. Figures 20 to 22 are schematic diagrams of a multi-tone signal (N=7) design according to an embodiment of the present application. Figures 23 to 25 are schematic diagrams of a design scheme for a multi-tone signal (N=8) provided in an embodiment of the present application. Figure 26 is a schematic diagram of a multi-tone signal counterclockwise rotation Acp provided in an embodiment of the present application. Figure 27 is a schematic diagram of a multi-tone signal translated along a time axis provided in an embodiment of the present application. Figure 28 is a schematic diagram of the structure of a multi-tone signal transmitting device provided in an embodiment of the present application. Figure 29 is a schematic diagram of the structure of another multi-tone signal transmitting device provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions of the present application will be described below in conjunction with the accompanying drawings. The technical solutions of the present application can be applied to wireless personal area networks (WPANs). Currently, WPANs adopt the Institute of Electrical and Electronics Engineers (IEEE) 802.15 series. WPANs can be used for communication between small-scale digital auxiliary devices such as telephones, computers, and accessory devices. Technologies that support wireless personal area networks include Bluetooth, ZigBee, ultra-wideband (UWB), infrared data association (IrDA) connection technology, home radio frequency (HomeRF), etc.From a network perspective, WPANs sit at the bottom layer of the overall network architecture, providing wireless connections between devices within a small area, typically point-to-point, short-range connections. They can be considered short-range wireless communication networks. Based on different application scenarios, WPANs are categorized into high-rate (HR) WPANs and low-rate (LR) WPANs. HR WPANs can support various high-rate multimedia applications, including high-quality audio and video distribution, multi-megabyte music, and image and document transfer. LR WPANs are used for general daily tasks. Within a WPAN, devices are categorized into full-function devices (FFDs) and reduced-function devices (RFDs) based on their communication capabilities. FFDs can communicate with each other, as well as with RFDs. RFDs cannot communicate directly with each other and can only communicate with one FFD or forward data through an FFD. The FFD associated with an RFD is called its coordinator. RFD devices are primarily used for simple control applications, such as light switches and passive infrared sensors. They transmit relatively small amounts of data, requiring minimal transmission and communication resources, resulting in a low RFD cost. A coordinator can also be referred to as a personal area network (PAN) coordinator or central control node. The PAN coordinator is the master control node for the entire network and... Devices, wearable devices, Internet of Things (IoT) devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile stations (MS), terminals, terminal equipment, portable communication devices, handheld devices, portable computing devices, entertainment devices, gaming devices or systems, global positioning system devices, or any other suitable device configured to conduct network communications via a wireless medium. Furthermore, the device may support the 802.15.4ab standard or a successor standard to 802.15.4ab. The device may also support multiple standards, such as 802.15.4a, 802.15.4-2011, 802.15.4-2015, and 802.15.4z. The device may also support various wireless local area network (WLAN) standards within the 802.11 family, including 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11a, and the next generation of 802.11be. In the embodiments of the present application, the device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also known as main memory). The operating system can be any one or more computer operating systems that implement service processing through processes, such as the Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Furthermore, the embodiments of the present application do not particularly limit the specific structure of the execution subject of the device provided by the embodiments of the present application. As long as it is possible to communicate with the device provided by the embodiments of the present application by running a program that records the code of the device provided by the embodiments of the present application, for example, the execution subject of the device provided by the embodiments of the present application may be an FFD or an RFD, or a functional module in the FFD or RFD that can call and execute a program.In addition, various aspects or features of the present application can be implemented as an apparatus, device, or article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical disks (e.g., compact discs (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). Furthermore, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data. The technical solutions of the present application can also be applied to wireless local area network systems such as the Internet of Things (IoT) network or the Vehicle to X (V2X) network. Of course, the embodiments of the present application can also be applied to other possible communication systems, such as the Long Term Evolution (LTE) system, the LTE Frequency Division Duplex (FDD) system, the LTE Time Division Duplex (TDD) system, the Universal Mobile Telecommunications System (UMTS), the Worldwide Interoperability for Microwave Access (WiMAX) communication system, the fifth generation (5G) communication system, and the future sixth generation (6G) communication system. It should be understood that AoA or AoD has been applied in low-power wireless narrowband technology, and the technical solutions provided in the present application are applicable to Bluetooth indoor positioning systems.This Bluetooth indoor positioning system can be applied to indoor navigation devices, such as using a Bluetooth bracelet as a navigation terminal, to effectively address the problem of blind people being unable to quickly, safely, and conveniently reach their target location from their current location when moving indoors, especially when navigating public places such as hospitals, subway stations, and shopping malls. The basic principles of AoA or AoD are explained below using Bluetooth BLE AoA or AoD as an example. Figure 1 is a structural diagram of an AoA positioning system applicable to this application. As shown in Figure 1, it includes a transmitting device and a receiving device. The transmitting device has one antenna, and the receiving device has two or more antennas (for example, four antennas). Exemplarily, when performing Bluetooth BLE AoA angle measurement, the transmitting device transmits a single-tone signal, i.e., a special Bluetooth signal with a sinusoidal baseband, which the Bluetooth protocol calls constant tone extension (CTE). While receiving the CTE single-tone signal, the receiving device continuously switches between the antennas, simultaneously sampling the baseband signal (including phase information) of each antenna, i.e., measuring the phase of the signal corresponding to each antenna. The processor in the receiving device can calculate the AoA angle by comparing the phase differences between the antennas. Figure 2 is a structural diagram of an AoD positioning system applicable to this application. As shown in Figure 2, it includes a transmitting device and a receiving device. The receiving device has one antenna, and the transmitting device has two or more antennas (for example, four antennas). For example, when performing Bluetooth Low Energy (BLE) AoD angle measurement, the transmitting device transmits a CTE signal segment while continuously switching between the antennas. While receiving the CTE single-tone signal, the receiving device determines the transmitting antenna corresponding to each portion of the CTE signal and samples the baseband signal corresponding to each antenna. The processor in the receiving device performs angle calculation based on the sampled baseband signal from each antenna. It should be understood that the AoA or AoD positioning systems shown in Figures 1 and 2 are merely illustrative and are not specifically limited in this application. The system is not limited to including additional devices, such as other receiving devices. Currently, low-power narrowband wireless technologies (such as Bluetooth and Zigbee) are increasingly widely used in daily life. Compared with other wireless technologies such as 5G and WiFi, the advantages of low-power narrowband wireless technology are: (1) very low power consumption, which means longer device usage time; (2) relatively simpler design and lower equipment cost.This has led to widespread adoption of low-power narrowband wireless technology not only in consumer devices (such as mobile phones, wearables, and smart homes), but also in a wide range of applications within the Industrial Internet of Things (IIoT). Low-power narrowband wireless technology not only connects devices but also measures the direction between them (i.e., AoA or AoD), enabling indoor positioning of devices. For example, Bluetooth AoA or AoD, as a representative AoA or AoD protocol in low-power narrowband wireless technology, has led to the increasing popularity of Bluetooth AoA or AoD indoor positioning systems. Zigbee devices from some manufacturers support MCPD ranging technology, which is used to determine the distance between two devices. The direction and / or distance information can be used to calculate the device's location. It should be understood that both AoA or AoD ranging and Zigbee MCPD ranging involve transmitting a single-tone (or single-carrier) signal, allowing the receiving device to perform phase measurements at a specific frequency. To improve direction and ranging accuracy, phase measurements are required at multiple frequencies. For example, Zigbee ranging uses 80 phase measurements at 1 MHz intervals in the 2.4 GHz Industrial, Scientific, and Medical (ISM) band, covering the entire 80 MHz band. Similarly, Bluetooth AoA or AoD ranging uses 37 phase measurements at 2 MHz intervals, covering approximately 80 MHz of the 2.4 GHz ISM band. The interval between adjacent channels (or frequencies) is 2 MHz. It should be noted that the frequency band applicable to Bluetooth Low Energy (BLE) AoA or AoD is 2.404 to 2.478 GHz. For other Bluetooth Low Energy (BLE) AoA or AoD specifications, please refer to the existing Bluetooth 5.1 protocol. For the sake of brevity, we will not elaborate on them here. Considering that both Bluetooth AoA / AoD and Zigbee MCPD use a single-tone (or single-carrier) signal for phase measurement, they can only measure the phase of a single frequency within the entire ISM band at a time, resulting in a long time required to complete measurements across the entire band. To reduce the phase measurement time for AoA or AoD, as well as MCPD ranging, for low-power narrowband devices, multi-tone signals can be transmitted. Specifically, the RF signal emitted by the device antenna can include multi-tone signals covering multiple frequencies (or can be considered as multiple carrier signals or multiple single-tone signals). Figure 3 is a schematic diagram of up-converting a baseband multi-tone signal into a RF multi-tone signal, as provided in an embodiment of the present application. As shown in Figure 3, the baseband multi-tone signal on the left is up-converted to produce the RF multi-tone signal on the right.For example, assuming a baseband multi-tone signal (N = 4, i.e., the number of tones is 4) with frequencies of fl = -1.5 MHz, f2 = -0.5 MHz, f3 = 0.5 MHz, and f4 = 1.5 MHz, the baseband multi-tone signal and the carrier signal (assuming a frequency of fc = 2.4515 GHz) are input into a mixer for mixing. This up-converts the baseband multi-tone signal into an ISM band multi-tone signal with frequencies of fl + fc = 2.450 GHz, f2 + fc = 2.451 GHz, f3 + fc = 2.452 GHz, and f4 + fc = 2.453 GHz. This allows for simultaneous phase measurement at the four frequencies of 2.450 GHz, 2.451 GHz, 2.452 GHz, and 2.453 GHz. Compared to traditional Bluetooth AoA / AoD and Zigbee MCPD ranging solutions, using multi-tone signals for phase measurement in AoA / AoD or MCPD ranging can significantly reduce overall measurement time and required power consumption. It should be noted that to uniformly sample the entire ISM band, the amplitude of each tone in the baseband multi-tone signal is set to the same value, and the frequency interval between adjacent tones is the same. It should be understood that baseband signal information includes amplitude and phase. The following illustrates baseband single-tone signals using two representations, shown in Figures 4 and 5. Exemplarily, the amplitude (A) and phase ((p)) information of the baseband signal can be described in the form of (In-phase & Quadrature, IQ), that is, / = / • cos q> I=A・ cos E cp E , Q = / • sin ° Q=A・ sin E(p E ; Alternatively, the IQ signal can also be represented in the form of a complex number, that is, s = / + j - 2 s=I+j-Qo Specifically, as shown in Figure 4, when the baseband signal is a single-tone signal (that is, a sine wave), the amplitude of the signal is fixed, and the phase (P) and time t satisfy: ( / ) = Inft + (p. ini cp=2nft+ cpEiniE, f is the frequency of the signal, (p mi cpEiniE is the initial phase of the signal (i.e., the phase of the signal at t=0). Therefore, the IQ of the baseband single-tone signal can be expressed as: / = / ・cos(2# + ',) I=A・ cos E 2nft+ cp E ini EEE,

[0029] Q = A - sin (2itft + ^>jm ) Q = A - sinE(2nft + cpEinil3)l2]o When the signal frequency f is positive, the phase (p) increases with time t, that is, the signal rotates counterclockwise with time t in the IQ plane. Conversely, when the signal frequency f is negative, the signal rotates clockwise with time t in the IQ plane. Specifically, as shown in Figure 5, when two baseband tone signals si and s2 are added, their sum s1 + s2 can be obtained using the parallelogram law (i.e., complex number addition). It should be understood that the amplitude of the baseband tone signal is fixed. For example, as mentioned above, / = κ·cos(2nft + cpEinil3),

[0030] Q = ^4 •sin(2^ / ? + hunger I=A- cosE 2nft+ cpl3inil3l3l3, Q=A· sinE(2nft+ cpEiniE)!?] The amplitude of the signal is always A and does not change over time. For a multi-tone signal, its IQ is the sum of the IQs of each tone (i.e., the complex addition of each IQ), and its amplitude varies over time. For example, in a multi-tone signal with N=4 (i.e., 4 tones), the frequencies of the single-tone signals are: fl = -1.5 MHz, f2 = -0.5 MHz, fi = 0.5 MHz, and f4 = 1.5 MHz. Each tone has an amplitude of 1 and an initial phase of 0. The maximum amplitude of this multi-tone signal is 4, corresponding to a maximum power of 4*4=16. Because the power of each tone is 1 (the amplitude of each tone is always 1), the average power of the multi-tone signal is 4. Therefore, the peak-to-average power ratio (PAPR) of the multi-tone signal is equal to 10 • log "(16 / 4) = 6.02dB. Assuming the maximum power of the transmitting device's PA is 10dBm, the average power transmitted by the multi-tone signal can only be set to a maximum of 10 - 6.02 = 3.98dBm. Otherwise, the peak power will exceed the upper limit of the PA, causing distortion of the signal transmitted by the PA. In summary, the larger the PAPR of the multi-tone signal, the lower the average power transmitted by the signal. Therefore, it is urgent to design a multi-tone signal to ensure that the PAPR of the signal is as low as possible, thereby achieving the optimal average transmission power. In view of this, the present application provides a method and apparatus for transmitting a multi-tone signal. Different multi-tone signals are designed by changing the initial phase to minimize the PAPR of the signal, thereby increasing the average power transmitted by the multi-tone signal, which is beneficial for improving the transmission distance or coverage of the multi-tone signal. Specifically, corresponding waveform designs (i.e., the initial phase of each tone) are found for multi-tone signals with different numbers of tones. , so that the PAPR of the multi-tone signal is minimized. To facilitate understanding of the embodiments of the present application, the terms or technologies involved in the present application are briefly described.

[0031] AoA: By using a single antenna to send packets with direction-finding capabilities, a low-energy (LE) device can make its direction available to a peer device. The peer device includes an RF switch and antenna array. It switches antennas and acquires IQ samples when receiving partial packets. These IQ samples are used to calculate the phase difference between the radio signals received by different elements of the antenna array, which in turn can be used to estimate the angle of arrival (AoA).

[0032] 2. AoD: By using multiple antennas to send data packets with direction finding capabilities and switching antennas while sending data packets, LE devices can make their direction available to peer devices. The peer device includes an RF switch and a single antenna. It receives data packets sent by each antenna and obtains IQ samples. Based on the IQ of each antenna, it calculates the phase difference between the antennas, which can be used to estimate the angle of departure (AoDo).

[0033] 3. Narrowband Signals: In this application, "narrowband signals" are used in contrast to "ultra-wideband signals." Ultra-wideband signals generally have a bandwidth of at least 500 MHz. Signals with a bandwidth smaller than that of ultra-wideband signals are considered narrowband signals. Optionally, narrowband signals include, but are not limited to, signals provided by the following wireless technologies: Bluetooth, ZigBee, technologies based on the 802.15.4 standard (such as Thread), and WiFi (including various 802.11 standards). Furthermore, they may include wireless technologies such as cellular systems' narrowband internet of things (NB-IoT), long-term evolution-machine-to-machine (LTE-M), LoRa, and Sigfox, as well as other future wireless technologies that may provide narrowband signals, without limitation.

[0034] 4. Upconversion and Downconversion: Upconversion involves frequency shifting the baseband signal's spectrum to a desired higher carrier frequency. Alternatively, upconversion modulates the baseband signal onto a carrier, or converts a signal modulated on a low-frequency carrier to a higher-frequency carrier. Specifically, the frequency-shifted signal is mixed with a sinusoidal signal (LO) generated by a local oscillator (LO) to change the signal's frequency band. Taking the upper sideband signal after mixing is upconversion, meaning the frequency is raised; taking the lower sideband signal after mixing is downconversion, meaning the frequency is lowered.

[0035] 5. Monotone Signals and Polytone Signals: A monotone signal is a sinusoidal wave of a single frequency, meaning it has only one spectral line. A polytone signal is generated by superimposing multiple independent sinusoidal waveforms, meaning it has multiple spectral lines. To facilitate understanding of the embodiments of this application, the following points are provided: First, in this application, unless otherwise specified or there is a logical conflict, the terminology and / or descriptions across different embodiments are consistent and can be referenced across them. Technical features from different embodiments can be combined to form new embodiments based on their inherent logical relationships. Second, in this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b, and c. A, b, and c can each be a single or multiple. Third, in this application, "first," "second," and various numerical numbers (e.g., #1, #2, etc.) indicate distinctions for ease of description and are not intended to limit the scope of the embodiments of this application. For example, they are used to distinguish between different messages, rather than to describe a specific order or precedence. It should be understood that the terms described in this manner are interchangeable where appropriate to describe solutions beyond the embodiments of this application. Fourth, in this application, phrases such as "when," "in the event of," and "if" all imply that the device will perform corresponding processing under certain objective circumstances. They do not limit the time period, nor do they require the device to perform judgment actions during implementation, nor do they imply any other limitations. Fifth, in this application, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, apparatus, system, product, or device that includes a series of steps or units is not necessarily limited to the steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to the process, apparatus, product, or device.Sixth, in this application, "protocol" may refer to a standard protocol in the communications field, such as the 5G protocol, the Bluetooth protocol, and related protocols used in future communication systems, and this application does not limit this. Seventh, in this application, a frequency point refers to a specific absolute frequency value, generally the center frequency of the modulated signal. It should be understood that a frequency point is a number assigned to a fixed frequency. A frequency band refers to the range from one frequency point to another. Eighth, in the embodiments of this application, the character "*" is an operator, indicating a product. The technical solutions provided by this application will be described in detail below with reference to the accompanying drawings. Figure 6 is a schematic flow chart of a first method for transmitting a multi-tone signal provided in an embodiment of this application. As shown in Figure 6, the apparatus includes the following steps.

[0036] S610: Generate a first multi-tone signal. The first multi-tone signal includes N single-tone signals, each having the same amplitude value, and at least two of the N single-tone signals having the same initial phase value, or at least two of the N single-tone signals having the same absolute value of the initial phase value, where N is an integer greater than or equal to 2. It should be noted that to ensure that all frequencies are evenly distributed during AoA or AoD and MCPD ranging measurements, the baseband multi-tone signal considered in this application has the same amplitude for each tone, and the frequency intervals between two adjacent tones are the same. For ease of analysis, the amplitudes of all tones in the multi-tone signal shown in this application are normalized to 1. For example, taking N=4 as an example, the initial phases of the first multi-tone signal may be 1.81, 0, 0, and 1.81; alternatively, the initial phases of the first multi-tone signal may be 4.47, 0, 0, and 4.47; further alternatively, the initial phases of the first multi-tone signal may be -0.08, -0.63, 0.63, and 3.70, etc., which are not specifically limited in this application. Optionally, at least two single-tone signals with the same initial phase are symmetrical about the center frequency. For example, taking N=4 as an example, the initial phase (p1) of the first single-tone signal is 1.81, the initial phase (p2) of the second single-tone signal is 0, the initial phase (p3) of the third single-tone signal is 0, and the initial phase (p4) of the fourth single-tone signal is 1.81. Correspondingly, the frequency of the first single-tone signal is -1.5 MHz, the frequency of the second single-tone signal is -0.5 MHz, the frequency of the third single-tone signal is 0.5 MHz, and the frequency of the fourth single-tone signal is 1.5 MHz. That is, the first single-tone signal and the fourth single-tone signal are symmetrical about the center frequency, and the second single-tone signal and the fourth single-tone signal are symmetrical about the center frequency. Next, taking the number of tones in the multi-tone signal equal to 3 (N=3) as an example, the design scheme of the multi-tone signal is described in conjunction with Figures 7 to 9. As shown in Figure 7, the frequency of the first single-tone signal in the multi-tone signal is the smallest, for example, fl=-1 MHz, the frequency of the third single-tone signal is the largest, for example, f3=1 MHz, and the frequency of the fourth single-tone signal is the largest. The frequency of the second single-tone signal is between the frequency of the first single-tone signal and the frequency of the third single-tone signal, for example, f2 = 0 MHz. The frequency interval of the multi-tone signal is 1 MHz, and the amplitude of each tone is the same. It should be noted that the initial phase value of each single-tone signal is between 0 and 2 Hz. By traversing the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combination can be recorded.For example, assuming that (pl, (p2, (p3) are the initial phases of the multi-tone signal at frequencies fl, f2, and f3, respectively, when (pl = 0 and (p3 = 0), by traversing the initial phases of q)2, it can be found that (p2 = 1.57, or (p2 = 4.71) corresponds to the lowest PAPR, that is, 2.22 dB. Compared with the PAPR corresponding to the traditional multi-tone signal of 10*lg(3*3 / 3)=4.77 dB (the initial phase of each tone is 0), this implementation method can obtain a benefit of 4.77 dB-2.22 dB=2.55 dB. That is, "(pl = 0, (p2 = 1.57, (p3 = 0" and "(pl = 0, (p2 = 4.71, (p3 = 0" are used as N=3 (fl=-1 MHz, f2=0 MHz, Figure 8 shows the optimal initial phase combination of a multi-tone signal with frequency fi = 1 MHz. Figure 8 shows the IQ plane trajectory of the multi-tone signal corresponding to the optimal initial phase combination of "(pl = 0, (p2 = 1.57, (p3 = 0)" (assuming the amplitude of each tone is 1). As shown in Figure 8, the IQ of the multi-tone signal moves back and forth on a "straight line" trajectory as time increases. Figure 9 shows the amplitude variation of the multi-tone signal corresponding to the optimal initial phase combination of "(pl = 0, (p2 = 1.57, (p3 = 0)" over time. As shown in Figure 9, the maximum amplitude of the multi-tone signal is 2.24, and the corresponding PAPR is 2.22 dBo. It should be noted that based on the two sets of optimal initial phase values ​​of "(pl = 0, (p2 = 1.57, (p3 = 0)" and "(pl = 0, (p2 = 4.71, (p3 = 0)" as the two "basic optimal initial phase combinations", Various other optimal initial phase combinations can be derived. The details are explained below and will not be repeated here. Next, using a multi-tone signal with four tones as an example, the design scheme for the multi-tone signal will be described with reference to Figures 10 to 13. As shown in Figure 10, the frequency of the first tone in the multi-tone signal is -1.5 MHz, the frequency of the second tone is -0.5 MHz, the frequency of the third tone is 0.5 MHz, and the frequency of the fourth tone is 1.5 MHz. The frequency interval of the multi-tone signal is 1 MHz, and the amplitude of each tone is the same. By iterating through the initial phases of each tone, the minimum PAPR value of the multi-tone signal can be determined to be 1.84 dB, and the corresponding initial phase combination is recorded.For example, assume that (p1, (p2, (p3, and (p4) are the initial phases of a multi-tone signal with frequencies fl, f2, f3, and f4, respectively. When (p2 = 0 and (p3 = 0), the PAPR contours corresponding to the two initial phases (p1) and (p4) are traversed. Specifically, see FIG11 . It can be found that the PAPR corresponding to "(p1 = (p4 = 1.81" or "(p1 = (p4 = 4.47" is the lowest value, i.e., 1.84 dBo). Compared to the PAPR corresponding to a traditional multi-tone signal of 10*log(4*4 / 4)=6.02 dB (the initial phase of each tone is 0), this implementation method can achieve a benefit of 6.02 dB-1.84 dB=4.18 dB.

[0037] R 7 , "(pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81" and "(pl = 4.47, (p2 = 0, (p3 = 0, (p4 = 4.47" are used as the optimal initial phase combinations for the multi-tone signal with N=4 (fl=-1.5 MHz, f2=-0.5 MHz, f3=0.5 MHz, f4=1.5 MHz). Figure 12 shows the variation trajectory of the multi-tone signal on the IQ plane corresponding to the optimal initial phase combination of "(pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81" (assuming the amplitude of each tone is 1). As shown in Figure 12, as time increases, the IQ of the multi-tone signal moves back and forth on this trajectory similar to the letter "N", and the time for one cycle is 2|is). FIG13 is a graph showing the variation of the amplitude of the multi-tone signal phase over time for the optimal initial phase combination of “(pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81”). As shown in FIG13, the maximum amplitude of the multi-tone signal is 2.47, and the corresponding PAPR is 1.84 dB. It should be noted that based on the two sets of optimal initial phase values ​​of “(pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81” and “(pl = 4.47, (p2 = 0, (p3 = 0, (p4 = 4.47” as the two sets of “based optimal initial phase combinations”, it can be The values ​​are: ((pl=1.59, (p4=1.98) , ((pl=1.98, (p4=1.59) , and ((pl=1.86, (p4=1.86) . Specifically, when 1.59 M(pl < 1.86, (p4 > -(pl + 3.57 JL(p4 < -(pl *4 / 9 + 2.69 ; or, when 1.86 M(pl M 1.98, (p4 > -(pl + 3.57 JL(p4 < - cp 1*9 / 4 + 6.04.

[0038] (2) The approximate triangle corresponding to the PAPR=2dB contour (upper right) has three vertices corresponding to the initial phase values: ((pl=4.3, (p4=4.69), ((pl=4.69, (p4=4.3) and ((pl=4.42, (p4=4.42). Specifically, when 4.3 M(pl < 4.42, (p4 < -(pl + 8.99 JL(p4 > -(pl*9 / 4 + 14.36; or, when 4.42 <(pl < 4.69, (p4 < -(pl + 8.99 JL(p4 > - cp 1*4 / 9 + 6.38. In another possible implementation, when the PAPR is less than or equal to 2.5dB, the corresponding value ranges of (pl) and (p4 include the following cases:

[0039] (1) The approximate triangle corresponding to the contour PAPR = 2.5dB (lower left), the three vertices correspond to the initial phase values: ((pl = 0, (p4 = 7t), ((pl = 7t, (p4 = 0) and ((pl = 2.05, (p4 = 2.05). Specifically, when 0 M(pl < 2.05), (p4 > -(pl + 7t) JL (p4 < -(pl*0.53 + 5.9t); or, when 2.05 M(pl < 7t, (p4 > -(pl + 7t) JL (p4 < -(pl*1.88 + 5.9t)

[0040] (2) For the approximate triangle corresponding to the contour PAPR=2.5dB (upper right), the initial phase values ​​corresponding to the three vertices are: (π1=π, π4=2π), (π1=2π, (p4=7π) and ((pl=4.23, (p4=4.23). Specifically, when πM(pl < 4.23), (p4 < -(pl + 9.42 πL(p4 > -(pl*1.88 + 12.18); or, when 4.23 <(pl < 2π), (p4 < -(pl + 9.42 πL(p4 > -(pl*0.53 + 6.47. In another possible implementation, when the PAPR is less than or equal to 3 dB, the corresponding value ranges of (pl) and (p4) include the following cases:

[0041] (1) For the approximate pentagon corresponding to the contour PAPR=3dB (lower left), the initial phase values ​​corresponding to the five vertices are: ((pl=0, (p4=2.92)), ((pl=0, (p4=3.36)), ((pl=2.3, (p4=2.3), ((pl=3.36, (p4=0) and ((pl=2.92, (p4=0)). Specifically, when 0 M(pl < 2.3, (p4 > -(pl + 2.92 JL(p4 < -(pl*0.46 + 3.36; when 2.3 M(pl < 2.92, (p4 > -(pl + 2.92 JL(p4 < -(pl*2.17 + 7.29; or, when 2.92 < (pl < When 3.36, (p4 > 0 JL(p4 < -(pl*2.17 + 7.29.

[0042] (2) For the approximate pentagon corresponding to the contour PAPR=3dB (upper right), the initial phase values ​​corresponding to the five vertices are: (p1=2π, (p4=3.36), (p1=2π, (p4=2.92), (p1=3.98, (p4=3.98), (p1=2.92, p4=2π) and (p1=3.36, p4=2π). Specifically, when 2.92 M(p1<3.36), (p4<2π > -(p1*2.17+12.62); when 3.36 M(p1<3.98), (p4<-(p1+9.64) > -(p1*2.17+12.62; or, when 3.98 <(pl < 2dB), (p4 < -(pl + 9.64) JL(p4 > -(pl*0.46 + 5.81). Based on the above implementation, if the initial phase of a multi-tone signal does not fall within the initial phase range corresponding to a PAPR less than or equal to 3dB, then the PAPR of the multi-tone signal is at least 3-1.84=1.16 dB higher than the PAPR corresponding to the multi-tone signal provided in the present application. Correspondingly, the average power of the transmitted signal is also at least 1.16 dB lower. Next, taking the number of tones in the multi-tone signal equal to 5 as an example, the design scheme of the multi-tone signal is described with reference to FIG14 to FIG16. As shown in FIG14, the frequency of the first tone signal in the multi-tone signal is the smallest, for example, fl=-1 MHz, the frequency of the fifth tone signal is the largest, for example, f5=1 MHz, the frequency of the second tone signal is between the frequency of the first tone signal and the frequency of the third tone signal, for example, f2=-0.5 MHz, f3=0 MHz, The frequency of the fourth tone signal is between the frequencies of the third and fifth tone signals, for example, f4 = 0.5 MHz. The frequency interval of the multi-tone signal is 0.5 MHz, and each tone has the same amplitude. By traversing the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combination can be recorded.For example, assuming that (p1 , (p2, (p3 , (p4 , and (p5 ) are initial phases of a multi-tone signal with frequencies fl , f2 , f3 , f4 , and f5 , respectively), when (p2 = 0 and (p4 = 0), by traversing the initial phases of (p1 , (p3 , (p4 , and (p5 ) , it can be found that "(p1 = 1.05, (p3 = 3.01 , (p5 = 1.05" or "(p1 = 2.09, (p3 = 0.13 , (p5 = 2.09" )" corresponds to the lowest PAPR, i.e., 1.76 dB. Compared to the PAPR corresponding to a traditional multi-tone signal of 10*log(5*5 / 5) = 6.99 dB (the initial phase of each tone is 0), this implementation method can achieve a benefit of 6.99 dB-1.76 dB=5.23 dB. That is, "(pl = 1.05, (p2 = 0, (p3 = 3.01, (p4 = 0, (p5 = 1.05" and "(pl = 2.09, (p2 = 0, (p3 = 0.13, (p4 = 0, (p5 = 2.09" are used as the optimal initial phase combinations for the multi-tone signal with N=5 (fl=-1 MHz, f2=-0.5 MHz, f3=0 MHz, f4=0.5 MHz, f5=1 MHz)). FIG15 shows the variation trajectory of the multi-tone signal corresponding to the optimal initial phase combination of "(pl = 1.05, (p2 = 0, (p3 = 3.01, (p4 = 0, (p5 = 1.05" on the IQ plane (assuming that the amplitude of each tone is 1). As shown in FIG15, as time increases, The IQ of the multi-tone signal moves back and forth along the trajectory shown in the figure. Figure 16 shows the variation in the amplitude of the multi-tone signal over time for the optimal initial phase combination of "(pl = 1.05, (p2 = 0, (p3 = 3.01, (p4 = 0, (p5 = 1.05". As shown in Figure 16, the maximum amplitude of the multi-tone signal is 2.74, and the corresponding PAPR is 1.76 dB. It should be noted that based on the two sets of optimal initial phase values ​​of "(pl = 1.05, (p2 = 0, (p3 = 3.01, (p4 = 0, (p5 = 1.05" and "(pl = 2.09, (p2 = 0, (p3 = 0.13, (p4 = 0, (p5 = 2.09" as the two "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived).The details are described below and are not detailed here. Next, taking the example of a multi-tone signal with six tones, the design scheme for the multi-tone signal will be described in conjunction with Figures 17 to 19. As shown in Figure 17, the frequency of the first tone signal in the multi-tone signal is the lowest, for example, fl = -1.25 MHz. The frequency of the sixth tone signal is the highest, for example, f6 = 1.25 MHz. The frequency of the second tone signal is between the frequencies of the first and third tone signals, for example, f2 = -0.75 MHz and f3 = -0.25 MHz. The frequency of the fourth tone signal is between 0.15 MHz and 1.25 MHz. From the initial phase, it can be found that the PAPR corresponding to "(pl = 5.00, (p2 = 3.67, (p5 = 3.67, (p6 = 5.00" or "(pl = 1.28, (p2 = 2.61 , (p5 = 2.61 , (p6 = 1.28 " is the lowest value, i.e. 1.90 dB) o Compared to the PAPR of 10*log(6*6 / 6)=7.78dB corresponding to the traditional multi-tone signal (the initial phase of each tone is 0), this implementation method can obtain a benefit of 7.78dB-1.90dB=5.88dB. 7 , we find “(pl = 5.00, (p2 = 3.67, (p3 = 0, (p4 = 0, (p5 = 3.67, (p6 = 5.00" and “(pl = 1.28, (p2 = 2.61 , (p3 = 0, (p4 = 0, (p5 = 2.61 , (p6 = 1.28" as the optimal initial phase combination of the multi-tone signal with N=6 (fl=-1.25 MHz, f2=-0.75 MHz, f3=-0.25 MHz, f4=0.25 MHz, f5=0.75 MHz, f6=1.25 MHz). FIG18 shows the optimal initial phase combination of “(pl = 5.00, (p2 = 3.67, (p3 = 0, (p4 = 0, (p5 = 3.67, The maximum value is 3.05, and the corresponding PAPR is 1.90 dBo. It should be noted that, based on the above two groups of optimal initial phase values ​​"(pl = 5.00, (p2 = 3.67, (p3 = 0, (p4 = 0, (p5 = 3.67, (p6 = 5.00" and "(pl = 1.28, (p2 = 2.61, (p3 = 0, (p4 = 0, (p5 = 2.61, (p6 = 1.28" as two groups of "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. The details are explained below and will not be repeated here. Next, taking the number of single tones in the multi-tone signal equal to 7 as an example, the design scheme of the multi-tone signal is explained in conjunction with Figures 20 to 22. As shown in Figure 20, the frequency point of the first single tone signal in the multi-tone signal is the smallest, for example, fl = -1.5 MHz, The seventh tone signal has the highest frequency, for example, f7 = 1.5 MHz. The second tone signal has a frequency between the first and third tone signals, for example, f2 = -1 MHz and f3 = -0.5 MHz. The fourth tone signal has a frequency between the third and fifth tone signals, for example, f4 = 0 MHz and f5 = 0.5 MHz. The sixth tone signal has a frequency between the fifth and seventh tone signals, for example, f6 = 1 MHz. The frequency interval of the multi-tone signal is 0.5 MHz, and each tone has the same amplitude. By traversing the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combination can be recorded.For example, assuming that (pl, (p2, (p3, (p4, (p5, (p6, and (p7) are initial phases of multi-tone signals with frequencies fl, f2, f3, f4, f5, f6, and f7, respectively, when (p3 = 0 and (p5 = 0), by traversing the initial phases of (pl, (p2, (p4, (p6, and (p7), it can be found that "(pl = 3.14, (p2 = 1.57, (p4 = 1.57, (p6 = 1.57, (p7 = 3.14", or "(pl = 3.14, (p2 = 4.71, (p4 = 4.71, (p6 = 4.71, (p7 = 3.14"). The corresponding PAPR is the lowest value, i.e., 1.38 dBo. Compared to the PAPR of 10*log(7*7 / 7)=8.45dB for a traditional multi-tone signal (with all tones initially at 0 phase), this implementation achieves a gain of 8.45dB-1.38dB = 7.07dB. Specifically, consider "(pl = 3.14, (p2 = 1.57, (p3 = 0, (p4 = 1.57, (p5 = 0, (p6 = 1.57, (p7 = 3.14") and "(pl = 3.14, (p2 = 4.71, (p3 = 0, (p4 = 4.71, (p5 = 0, (p6 = 4.71, (p7 = 3.14") as the N=6 (fl=-1.25 MHz, f2=-0.75 MHz, normalized =-0.25 MHz, Alternatively, you can also use . 11 MHz) as the optimal initial phase combination of the multi-tone signal with N=7 (fl=-1.5 MHz, f2=-1 MHz, f3=-0.5 MHz, f4=0 MHz, f5=0.5 MHz, f6=1 MHz, f7=1.5 MHz). FIG21 shows the optimal initial phase combination of “(pl = 7i, (p2 = 1.57, (p3 = 0, (p4 = 1.57, (p5 = 0, (p6 = 1.57, (p7 = 3.14" on the IQ plane (assuming the amplitude of each tone is 1). As shown in Figure 21, as time increases, the IQ of the multi-tone signal moves back and forth on the trajectory shown in the figure. Figure 22 shows the change in the amplitude of the multi-tone signal over time when the optimal initial phase combination is "(pl = 3.14, (p2 = 1.57, (p3 = 0, (p4 = 1.57, (p5 = 0, (p6 = 1.57, (p7 = 3.14"). As shown in Figure 22, the maximum amplitude of the multi-tone signal is 3.1, and the corresponding PAPR is 1.38 dB. It should be noted that based on the above two sets of optimal initial phase values ​​"(pl = 3.14, (p2 = 1.57, (p3 = 0, (p4 = 1.57, (p5 = 0, (p6 = 1.57, (p7 = 3.14" and "(p1 = 3.14, (p2 = 4.71, (p3 = 0, (p4 = 4.71, (p5 = 0, (p6 = 4.71, (p7 = 3.14" are used as two sets of "basic optimal initial phase combinations", from which various other optimal initial phase combinations can be derived. The details are described below and are not repeated here. Next, taking the case where the number of tones in a multi-tone signal is equal to 8 as an example, the design scheme for the multi-tone signal is described in conjunction with Figures 23 to 25.As shown in FIG23 , the frequency of the first tone signal in the multi-tone signal is the smallest, for example, fl = -1.75 MHz. The frequency of the eighth tone signal is the largest, for example, f8 = 1.75 MHz. The frequency of the second tone signal is between the frequencies of the first and third tone signals, for example, f2 = -1.25 MHz and f3 = -0.75 MHz. The frequency of the fourth tone signal is between the frequencies of the third and fifth tone signals, for example, f4 = -0.25 MHz and f5 = 0.25 MHz. The frequency of the sixth tone signal is between the frequencies of the fifth and seventh tone signals, for example, f6 = 0.75 MHz and f7 = 1.25 MHz. The frequency interval of the multi-tone signal is 0.5 MHz, and the amplitude of each tone is the same. By traversing the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combination can be recorded. For example, assuming that (pl, (p2, (p3, (p4, (p5, (p6, (p7, and (p8) are initial phases of multi-tone signals with frequencies fl, f2, f3, f4, f5, f6, f7, and f8, respectively), when (p4 = 0 and (p5 = 0), by traversing the initial phases of (pl, (p2, (p3, (p6, (p7, and (p8), it can be found that “(pl = 5.40, (p2 = 3.84, (p3 = 0.91, (p6 = 0.91, (p7 = 3.84, (p8 = 5.40”, or “(pl = 0.88, (p2 = 2.45, (p3 = 5.37, (p6 = 5.37, (p7 = 2.45, (p8 = The PAPR corresponding to 0.88" is the lowest value, namely 1.16dB dB. Compared with the PAPR corresponding to the traditional multi-tone signal of 10*log(8*8 / 8)=9.03 dB (the initial phase of each tone is 0), this implementation method can obtain a benefit of 9.03dB-1.16dB = 7.87 dB.That is, “(pl = 5.40, (p2 = 3.84, (p3 = 0.91 , (p4 = 0, (p5 = 0, (p6 = 0.91 , (p7 = 3.84, (p8 = 5.40" and “(pl = 0.88, (p2 = 2.45, (p3 = 5.37, (p4 = 0, (p5 = 0, (p6 = 5.37, (p7 = 2.45, (p8 = 0.88" are taken as N=8 (fl=-1.75 MHz, f2=-1.25 MHz,fl=-0.75 MHz, f4=-0.25 MHz, f5=0.25 MHz, f6=0.75 MHz, f7=1.25 MHz, f8=1.75 MHz)” Optimal initial phase combination for multi-tone signals. Figure 24 shows the trajectory of the multi-tone signal on the IQ plane corresponding to the optimal initial phase combination of "(pl = 5.40, (p2 = 3.84, (p3 = 0.91 , (p4 = 0, (p5 = 0, (p6 = 0.91 , (p7 = 3.84, (p8 = 5.40") (assuming the amplitude of each tone is 1). As shown in Figure 24, as time increases, the IQ of the multi-tone signal moves back and forth on the trajectory shown in the figure, and the time for one cycle is 4|iS. Figure 25 shows the optimal initial phase combination of "(pl = 5.40, (p2 = 3.84, (p3 = 0.91 , (p4 = 0, (p5 = 0, (p6 = 0.91 , (p7 = 3.84, (p8 = 5.40") " is a graph showing the variation of the amplitude of the corresponding multi-tone signal over time. As shown in FIG25 , the maximum amplitude of the multi-tone signal is 3.1, and the corresponding PAPR is 1.16 dB. It should be noted that based on the above two groups of optimal initial phase values ​​"(pl = 5.40, (p2 = 3.84, (p3 = 0.91, (p4 = 0, (p5 = 0, (p6 = 0.91, (p7 = 3.84, (p8 = 5.40" and "(pl = 0.88, (p2 = 2.45, (p3 = 5.37, (p4 = 0, (p5 = 0, (p6 = 5.37, (p7 = 2.45, (p8 = 0.88" as the two groups of "basic optimal initial phase combinations", it can be obtained. Exemplarily, N=4, and the initial phase (p1 = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81) of each single-tone signal in the first multi-tone signal is rotated counterclockwise by Acp = 7t / 6 = 0.52, and the corresponding initial phase is (p1 = 2.33, (p2 = 0.52, (p3 = 0.52, (p4 = 2.33). It should be understood that the PAPRs corresponding to these two groups of initial phase combinations are the same. As shown in Fig. 26, for the IQ trajectory of the base initial phase “(pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81)” in the IQ plane, after counterclockwise rotation, the initial phase of each tone increases by △(p = 7t / 6 = 0.52, that is, the initial phase becomes “(pl = 2.33, (p2 = 0.52, (p3 = 0.52, (p4 = 2.33)”, and the corresponding optimal PAPR is the same. In another possible implementation, based on the fact that the phases of at least two single-tone signals are the same, each single-tone signal s, = cos(2πft + φi) + j·sin(2πft + φi) in the first multi-tone signal is translated by At on the time axis, where k is an arbitrary value, and the corresponding multi-tone signal is also translated by k on the time axis, that is, s' = cos(2πf(t + k) + φi) + j·sin(2πf(t + k) + φi) = cos(2πft + (2πfk + φi)) + j·sin(2πft + (2πfk + φi)) is equivalent to increasing the initial phase of each single-tone signal by Error! Digit expected.. This translation does not affect the maximum value of the multi-tone signal amplitude, so the translated multi-tone signal can also obtain the optimal PAPR. Exemplarily, when N = 4, each single-tone signal in the first multi-tone signal with the initial phase (pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81) is shifted left by At = 0.2|is on the time axis, and the corresponding initial phase is (pl = -0.08, (p2 = -0.63, (p3 = 0.63, (p4 = 3.70). It should be understood that the PAPR corresponding to these two groups of initial phase combinations is the same. s'Eil2]= cosE(2n fEil3(t+At) + cpl3il3)l3+j· sinE 2n fEiE t+AtE+ cpl3il3l3l3= cosE( (2n fE iEt+ 2n fEiia-At+甲l2通12)12+尸 sinE 2n fEiiat+(2n fl2iia』t+甲l2通12)12Specifically, Fig. 27 is a schematic diagram of a multi-tone signal translated by k on the time axis provided by an embodiment of the present application.As shown in FIG27 , the amplitude variation curve of the multi-tone signal corresponding to the basic initial phase “(pl = 1.81, (p2 = 0, (p3 = 0, (p4 = 1.81”) over time is shown. After the amplitude is shifted left by Δt = 0.2|is in time, the corresponding initial phase becomes “(pl = -0.08, (p2 = -0.63, (p3 = 0.63, (p4 = 3.70”), and the corresponding optimal PAPR is the same. In another possible implementation, based on the same initial phase of at least two single-tone signals, each point of each single-tone signal on the IQ plane is rotated counterclockwise by Δ◎, and each single-tone signal is translated on the time axis. This also does not affect the maximum amplitude of the multi-tone signal. Therefore, the translated multi-tone signal can also obtain the optimal PAPR. It should be noted that the order of rotating and translating the multi-tone signals is not specifically limited. For example, N=4, The initial phase (p1 = 1.81, p2 = 0, p3 = 0, p4 = 1.81) of each single tone signal in the first multi-tone signal is rotated counterclockwise by Δ(p = n / 6 = 0.52) and then shifted left on the time axis by Δt = 0.2|is. The PAPR corresponding to the resulting initial phase is the same as the PAPR corresponding to the original initial phase. It should be noted that the frequency interval between any two adjacent single tone signals in the N single tone signals in the first multi-tone signal is the same. For example, the frequency interval of 4 tones is 1 MHz, the frequency interval of 6 tones is 0.5 MHz, and the frequency interval of 8 tones is 0.5 MHz, all of which are specific values. It should be understood that the optimal initial phase in the above implementation is also applicable to other frequency intervals. In one possible implementation, taking N = 4 tones as an example, the frequencies of the multi-tone signal (with a frequency interval of 1 MHz) are respectively -1.5 MHz, -0.5 MHz, and 0.5 MHz. The optimal initial phase for "MHz and 1.5 MHz" also applies to multi-tone signals with frequencies of "-3 MHz, -1 MHz, 1 MHz, and 3 MHz" (with a frequency interval of 2 MHz). This is because the time axis of each tone can be simultaneously scaled down or scaled up, which is equivalent to multiplying the frequency of each tone by the same factor. The corresponding time axis of the multi-tone signal is also scaled down or scaled up in the same way. This change in the time axis does not change the maximum amplitude of the multi-tone signal, so the same optimal PAPR value can be achieved. It should be noted that the frequencies of the various tones in the above implementation are symmetrical around 0 Hz. It should be understood that the optimal initial phase in the above implementation also applies to frequency settings that are not symmetrical around 0 Hz.In another possible implementation, taking N=4 tones as an example, the frequencies of the multi-tone signal (frequency interval is 1 MHz) are "-1.5 MHz, -0.5 MHz, 0.5 MHz, and 1.5 MHz", and the optimal initial phase also applies to the frequencies. The above description, in conjunction with Figures 1 to 27 , details embodiments of the multi-tone signal transmission method of the present application. The following description of the apparatus embodiment of the present application, in conjunction with Figures 28 and 29 , details are provided. It should be understood that the description of the apparatus embodiment corresponds to the description of the device embodiment. Therefore, for portions not described in detail, reference can be made to the preceding apparatus embodiment. Figure 28 is a schematic block diagram of an apparatus for transmitting multi-tone signals provided in an embodiment of the present application. As shown in Figure 28 , apparatus 2000 may include a transceiver unit 2010 and a processing unit 2020. Transceiver unit 2010 can communicate with the outside world, and processing unit 2020 is used for data processing. Transceiver unit 1210 may also be referred to as a communication interface or transceiver unit. In one possible design, apparatus 2000 may implement steps or processes corresponding to those performed by the transmitting device in the above apparatus embodiment. The processing unit 2020 is used to perform processing-related operations of the transmitting device in the above apparatus embodiment, and the transceiver unit 2010 is used to perform transceiver-related operations of the transmitting device in the above apparatus embodiment. In another possible design, the apparatus 2000 can implement steps or processes corresponding to those performed by the receiving device in the above apparatus embodiment, wherein the transceiver unit 2010 is configured to perform the transceiver-related operations of the receiving device in the above apparatus embodiment, and the processing unit 2020 is configured to perform the processing-related operations of the receiving device in the above apparatus embodiment. It should be understood that the apparatus 2000 herein is embodied as a functional unit. The term "unit" herein may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (e.g., a shared processor, a dedicated processor, or a group processor) for executing one or more software or firmware programs, memory, merged logic circuits, and / or other suitable components that support the described functions. In an alternative example, those skilled in the art will appreciate that the apparatus 2000 can be specifically the transmitting end in the above apparatus embodiment, and can be configured to perform the various processes and / or steps corresponding to the transmitting end in the above apparatus embodiment. Alternatively, the apparatus 2000 can be specifically the receiving end in the above apparatus embodiment, and can be configured to perform the various processes and / or steps corresponding to the receiving end in the above apparatus embodiment. To avoid repetition, further description is omitted here. The apparatus 2000 in each of the above solutions has the function of implementing the corresponding steps performed by the transmitting end in the above apparatus, or the apparatus 2000 in each of the above solutions has the function of implementing the corresponding steps performed by the receiving end in the above apparatus. The functions may be implemented by hardware, or by hardware executing corresponding software implementations.The hardware or software includes one or more modules corresponding to the aforementioned functions. For example, the transceiver unit can be replaced by a transceiver (e.g., the transmitting unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver). Other units, such as the processing unit, can be replaced by a processor, respectively performing the transceiver operations and related processing operations in each device embodiment. Furthermore, the transceiver unit can also be a transceiver circuit (e.g., including a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit. In the embodiments of the present application, the device in FIG. 28 can be the receiving end or transmitting end in the aforementioned embodiments, or a chip or chip system, such as a system on chip (SoC). The transceiver unit can be an input / output circuit or a communication interface. The processing unit can be a processor, microprocessor, or integrated circuit integrated on the chip. This is not limited here. Figure 29 illustrates a multi-tone signal transmitting apparatus 3000 provided in an embodiment of the present application. As shown in Figure 29 , the apparatus 3000 includes a processor 3010 and a transceiver 3020. The processor 3010 and the transceiver 3020 communicate with each other via an internal connection path. The processor 3010 is configured to execute instructions and control the transceiver 3020 to transmit and / or receive signals. Optionally, the apparatus 3000 may further include a memory 3030, which communicates with the processor 3010 and the transceiver 3020 via an internal connection path. The memory 3030 is configured to store instructions, and the processor 3010 may execute the instructions stored in the memory 3030. In one possible implementation, the apparatus 3000 is configured to implement the various processes and steps corresponding to the transmitting device in the above-described apparatus embodiment. In another possible implementation, the apparatus 3000 is configured to implement the various processes and steps corresponding to the receiving device in the above-described apparatus embodiment. It should be understood that the apparatus 3000 can specifically be the transmitting end or receiving end in the above-mentioned embodiments, or can also be a chip or chip system. Correspondingly, the transceiver 3020 can be the transceiver circuit of the chip, which is not limited herein. Specifically, the apparatus 3000 can be used to execute the various steps and / or processes corresponding to the transmitting end or receiving end in the above-mentioned apparatus embodiments. Optionally, the memory 3030 can include read-only memory and random access memory, and provide instructions and data to the processor. A portion of the memory can also include non-volatile random access memory. For example, the memory can also store device type information.The processor 3010 can be configured to execute instructions stored in the memory. When executing the instructions stored in the memory, the processor 3010 is configured to perform the various steps and / or processes of the aforementioned apparatus embodiments corresponding to the transmitting end or receiving end. During implementation, the various steps of the aforementioned apparatus embodiments can be performed by hardware integrated logic circuits within the processor or by software instructions. The steps of the apparatus disclosed in conjunction with the embodiments of this application can be directly implemented by a hardware processor or by a combination of hardware and software modules within the processor. The software modules can be located in a storage medium known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. The storage medium is located in the memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the aforementioned apparatus steps. To avoid repetition, detailed description is omitted here. It should be noted that the processor in the embodiments of this application can be an integrated circuit chip with signal processing capabilities. During implementation, the various steps of the aforementioned apparatus embodiments can be performed by hardware integrated logic circuits within the processor or by software instructions. The aforementioned processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The processor in the embodiments of the present application may implement or execute the various devices, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the devices disclosed in the embodiments of the present application may be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules within the decoding processor. The software module may be located in a storage medium known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. The storage medium is located in a memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the aforementioned devices. It will be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM) or flash memory.Volatile memory can be random access memory (RAM), which functions as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and devices described herein is intended to include, but is not limited to, these and any other suitable types of memory. In accordance with the apparatus provided in the embodiments of the present application, the present application also provides a computer program product comprising: computer program code that, when executed on a computer, causes the computer to execute the apparatus of the aforementioned embodiments. In accordance with the apparatus provided in the embodiments of this application, this application also provides a computer-readable medium storing program code. When the program code is executed on a computer, it causes the computer to execute the apparatus described in the above-described embodiments. Those skilled in the art will appreciate that the units and algorithm steps described in the various examples in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals skilled in the art may use different devices to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application. Those skilled in the art will clearly understand that, for ease of description and brevity, the specific operating processes of the systems, devices, and units described above can refer to the corresponding processes in the aforementioned device embodiments and will not be further described here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and apparatuses can be implemented in other ways.For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical functional division. In actual implementation, other divisions may be employed. For example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of these units may be selected to achieve the objectives of the present embodiments as needed. Furthermore, the functional units in the various embodiments of the present application may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. If the functions are implemented as software functional units and sold or used as standalone products, they may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, or the portion that contributes to the prior art, or the portion of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the apparatus described in each embodiment of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in this application should be covered by the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

Claims 1. A method for transmitting a multi-tone signal, characterized in that: include: Generate a first multi-tone signal, where the first multi-tone signal includes N single-tone signals, each single-tone signal has the same amplitude value, at least two of the N single-tone signals have the same initial phase, or at least two of the N single-tone signals have the same absolute value of the initial phase, where N is an integer greater than or equal to 2; and send the first multi-tone signal.

2. The method according to claim 1, wherein: The at least two single-tone signals with the same initial phase are symmetrical about the center frequency.

3. The method according to claim 1 or 2, characterized in that When N=4, the initial phases of the single-tone signals satisfy one or more of the following: the initial phases of the first single-tone signal and the fourth single-tone signal are the same; or the initial phases of the second single-tone signal and the third single-tone signal are the same; The frequency of the first single tone signal is the smallest, the frequency of the fourth single tone signal is the largest, and the frequency of the second single tone signal is greater than the frequency of the first single tone signal and less than the frequency of the third single tone signal.

4. The method according to claim 1 or 2, characterized in that When N=8, the initial phases of the tone signals satisfy one or more of the following: the initial phases of the first tone signal and the eighth tone signal are the same; the initial phases of the second tone signal and the seventh tone signal are the same; the initial phases of the third tone signal and the sixth tone signal are the same; or the initial phases of the fourth tone signal and the fifth tone signal are the same; The frequency of the first single-tone signal is the smallest, the frequency of the eighth single-tone signal is the largest, the frequency of the third single-tone signal is greater than the frequency of the second single-tone signal and less than the frequency of the fourth single-tone signal, the frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than the frequency of the sixth single-tone signal, and the frequency of the sixth single-tone signal is less than the frequency of the seventh single-tone signal.

5. The method according to claim 1 or 2, characterized in that When N=4, the initial phases of the N single-tone signals satisfy any one of the following: (p2=(p3=0, 1.59<(pl < 1.86, (p4>-(pl +3.57, JL (p4 <- cp 1*4 / 9 + 2.69; (p2=(p3=0, 1.86 < (pl < 1.98, (p4 > - (pl + 3.57, JL (p4 < - (pl*9 / 4 + 6.04; (p2=(p3=0, 4.3 < (pl < 4.42, (p4 < - (pl + 8.99, JL (p4 > - (pl*9 / 4 + 14.36; (p2=(p3=0, 4.42 < (pl < 4.69, (p4 < - (pl + 8.99, JL (p4 > - (pl*4 / 9 + 6.38; (p2=(p3=0, 0 < (pl < 2.05, (p4 > - (pl + 7t, JL (p4 < - (pl*0.53 + 7t; (p2 = (p3 = 0, 2.05 < (pl < 7t, (p4 > - (pl + 7t, JL(p4 < - (pl * 1.88 + 5.9; (p2 = (p3 = 0, 7t < (pl < 4.23, (p4 < - (pl + 9.42, JL(p4 > - (pl * 1.88 + 12.18; (p2 = (p3 = 0, 4.23 < (pl < 2n, (p4 < - (pl + 9.42, JL (p4 > - (pl * 0.53 + 6.47 : (p2 = (p3 = 0, 0 < (pl < 2.3, (p4 > - (pl + 2.92, JL (p4 < - (pl * 0.46 + 3.36; (p2 = (p3 = 0, 2.3 < (pl < 2.92, (p4 > - (pl + 2.92, JL (p4 < - (pl * 2.17 + 7.29; (p2 = (p3 = 0, 2.92 < (pl < 3.36, (p4 > 0, JL (p4 < - (pl * 2.17 + 7.29; 23 (p2 = (p3 = 0, 2.92 < (pl < 3.36, (p4 M 2兀, JL (p4 > - (pl * 2.17 + 12.62 ; (p2 = (p3 = 0, 3.36 < (pl < 3.98, (p4 < - (pl + 9.64, JL (p4 > - (pl * 2.17 + 12.62 ; or, (p2 = (p3 = 0, 3.98 < (pl < 2n, (p4 < - (pl + 9.64, JL (p4 > - (pl * 0.46 + 5.81 : where, (pl is the initial phase of the first single - tone signal, (p2 is the initial phase of the second single - tone signal, (p3 is the initial phase of the third single - tone signal, and (p4 is the initial phase of the fourth single - tone signal.

6. The method according to any one of claims 1 to 5, characterized in that The frequency interval between any two adjacent single - tone signals among the N single - tone signals is the same.

7. The method according to claim 6, characterized in that When N = 4, the frequency interval between any two adjacent single - tone signals among the N single - tone signals is 1 MHz.

8. The method according to claim 7, characterized in that The frequency of the first single - tone signal is - 1.5 MHz, the frequency of the second single - tone signal is - 0.5 MHz, the frequency of the third single - tone signal is 0.5 MHz, and the frequency of the fourth single - tone signal is 1.5 MHz; or, the frequency of the first single - tone signal is - 1 MHz, the frequency of the second single - tone signal is 0 MHz, the frequency of the third single - tone signal is 1 MHz, and the frequency of the fourth single - tone signal is 2 MHz.

9. The method according to claim 6, characterized in that When N=4, the frequency interval between any two adjacent single-tone signals in the N single-tone signals is 2 MHz.

10. The method according to claim 9, characterized in that The frequency of the first single tone signal is -3 MHz, the frequency of the second single tone signal is -1 MHz, the frequency of the third single tone signal is 1 MHz, and the frequency of the fourth single tone signal is 3 MHz.

11. A device for transmitting a multi-tone signal, characterized in that: include: a processing unit, configured to generate a first multi-tone signal, where the first multi-tone signal includes N single-tone signals, each single-tone signal has the same amplitude value, at least two of the N single-tone signals have the same initial phase, or at least two of the N single-tone signals have the same absolute value of the initial phase, where N is an integer greater than or equal to 2; and a transceiver unit, configured to send the first multi-tone signal.

12. The device according to claim 11, characterized in that The at least two single-tone signals with the same initial phase are symmetrical about the center frequency.

13. The device according to claim 11 or 12, characterized in that 14. The device according to claim 11 or 12, characterized in that When N=8, the initial phases of the tone signals satisfy one or more of the following: the initial phases of the first tone signal and the eighth tone signal are the same; the initial phases of the second tone signal and the seventh tone signal are the same; the initial phases of the third tone signal and the sixth tone signal are the same; or the initial phases of the fourth tone signal and the fifth tone signal are the same; The frequency of the first single-tone signal is the smallest, the frequency of the eighth single-tone signal is the largest, the frequency of the third single-tone signal is greater than the frequency of the second single-tone signal and less than the frequency of the fourth single-tone signal, the frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than the frequency of the sixth single-tone signal, and the frequency of the sixth single-tone signal is less than the frequency of the seventh single-tone signal.

15. The device according to claim 11 or 12, characterized in that When N=4, the initial phases of the N single-tone signals satisfy any one of the following: (p2=(p3=0, 1.59<(pl < 1.86, (p4>-(pl +3.57, JL (p4 <- cp 1*4 / 9 + 2.69; (p2=(p3=0, 1.86 < (pl < 1.98, (p4 > - (pl + 3.57, JL (p4 < - (pl*9 / 4 + 6.04; (p2=(p3=0, 4.3 < (pl < 4.42, (p4 < - (pl + 8.99, JL (p4 > - (pl*9 / 4 + 14.36; (p2=(p3=0, 4.42 < (pl < 4.69, (p4 < - (pl + 8.99, JL (p4 > - (pl*4 / 9 + 6.38; (p2=(p3=0, 0 < (pl < 2.05, (p4 > - (pl + 7t, JL (p4 < - (pl*0.53 + 7t; (p2=(p3=0, 2.05 < (pl < 7t, (p4 > - (pl + 7t, JL(p4<-(pl*1.88 + 5.9; (p2=(p3=0, 7t < (pl < 4.23, (p4 < - (pl + 9.42, JL(p4>-(pl*1.88 + 12.18; (p2=(p3=0, 4.23 < (pl < 2n, (p4 < - (pl + 9.42, JL (p4 > - (pl*0.53 + 6.47 : (p2=(p3=0, 0 < (pl <2.3, (p4 > - (pl + 2.92, JL (p4 < - (pl*0.46 + 3.36; (p2=(p3=0, 2.3 <(pl <2.92, (p4>-(pl +2.92, JL (p4 <- (pl *2.17 + 7.29; (p2=(p3=0, 2.92 <(pl <3.36, (p4> 0, JL (p4 <- (pl *2.17 + 7.29; (p2=(p3=0, 2.92 <(pl <3.36, (p4 M 2兀, JL (p4 > - (pl*2.17 + 12.62; (p2=(p3=0, 3.36 <(pl <3.98, (p4 < - (pl +9.64, JL (p4 >- (pl *2.17 + 12.62; or, (p2=(p3=0, 3.98 < (pl < 2n, (p4 < - (pl + 9.64, JL (p4 > - (pl*0.46 + 5.81 : where, (pl is the initial phase of the first single-tone signal, (p2 is the initial phase of the second single-tone signal, (p3 is the initial phase of the third single-tone signal, and (p4 is the initial phase of the fourth single-tone signal.

16. The device according to any one of claims 11 to 15, characterized in that The frequency interval between any two adjacent single-tone signals among the N single-tone signals is the same.

17. The device according to claim 16, characterized in that When N = 4, the frequency interval between any two adjacent single-tone signals among the N single-tone signals is 1 MHz.

18. The device according to claim 17, characterized in that The frequency of the first single-tone signal is -1.5 MHz, the frequency of the second single-tone signal is -​0.5 MHz, the frequency of the third single-tone signal is 0.5 MHz, and the frequency of the fourth single-tone signal is 1.5 MHz; or, the frequency of the first single-tone signal is -1 MHz, the frequency of the second single-tone signal is 0 MHz, the frequency of the third single-tone signal is 1 MHz, and the frequency of the fourth single-tone signal is 2 MHz.

19. The device according to claim 16, characterized in that When N=4, the frequency interval between any two adjacent single-tone signals among the N single-tone signals is 2 MHz.

20. The device according to claim 19, characterized in that The frequency of the first single tone signal is -3 MHz, the frequency of the second single tone signal is -1 MHz, the frequency of the third single tone signal is 1 MHz, and the frequency of the fourth single tone signal is 3 MHz.

21. A device for transmitting a multi-tone signal, characterized in that: include: a processor coupled to the memory; The processor is configured to execute the computer program stored in the memory, so that the apparatus performs the method according to any one of claims 1 to 10.

22. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a communication device equipped with the chip executes the method according to any one of claims 1 to 10.

23. A computer program, characterized in that: When the computer program is executed by the device, the method according to any one of claims 1 to 31 is implemented.

24. A computer-readable storage medium, characterized in that: include: The computer-readable storage medium stores a computer program, and when the computer program is executed, the computer is enabled to perform the method according to any one of claims 1 to 10. 26

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