A method to improve UWB bandwidth

Abstract

The present invention proposes a method for improving UWB bandwidth, including: determining the pulse shaping coefficient of the UWB signal to define the basic shape and frequency characteristics of the signal; designing the pulse parameters of the injection signal to expand the signal bandwidth and meet the power and spurious requirements; calculating the total power after the original UWB signal and the injection signal are synthesized to ensure that the power requirements and spectrum distribution are met; transmitting the synthesized UWB signal to achieve bandwidth expansion. The method effectively expands the bandwidth by injecting redundant signals during the idle period of the UWB signal, while reducing the difficulty of spectrum spurious design and improving the flexibility of system design. The present invention meets the UWB system's requirement for 10dB bandwidth, is applicable to a variety of devices, improves the data transmission rate, and is particularly suitable for indoor high-speed wireless access, providing technical support for UWB technology in a variety of application scenarios.

Description

Technical Field

[0001] The present invention relates to an ultra-wideband (UWB) wireless communication technology, and in particular to a method for improving UWB bandwidth. Background Art

[0002] Ultra-wideband (UWB) technology is a wireless carrier communication technology that does not use a sinusoidal carrier but uses nanosecond non-sinusoidal narrow pulses to transmit data, so it occupies a wide spectrum range. UWB technology has the advantages of low system complexity, low power spectrum density of transmitted signals, insensitivity to channel fading, low interception capability, and high positioning accuracy. It is especially suitable for high-speed wireless access in dense multipath places such as indoors. UWB communication technology can be applied to various devices such as mobile phones, wearable devices, tags, locators, digital keys, smart homes, automobiles, and the Internet of Things to achieve various solutions such as ranging, positioning, and short-range wireless connection markets.

[0003] UWB technology needs to be applied to work at a certain frequency and bandwidth, and each country has requirements for transmission frequency, bandwidth, and emission spurious. Taking China's ultra-wideband (UWB) radio transmission equipment technical requirements as an example, the operating frequency range is 7163-8812MHz, and the transmission signal bandwidth is required to be no less than 500MHz. Countries require that the 10dB bandwidth of UWB transmission is at least 500MHz, the equivalent isotropic radiation power spectrum density limit is no more than -41dBm / MHz, and the out-of-band transmission power limit is: 5.925-7.125GHz, the limit is -70dBm / MHz; 7.125-7.163GHz, the limit is -51dBm / MHz; 8.812-9GHz, the limit is -51dBm / MHz; 9-10.6GHz, the limit is -65dBm / MHz.

[0004] The prior art generally transmits fixed pulse signals, and transmits signals of a certain bandwidth by controlling the digital power amplifier to shape and window the pulses. The disadvantages of the prior art mainly include:

[0005] 1. In a typical UWB system, such as Figure 1 As shown in Figure 1, a digital transmitter architecture is usually used, which does not include an independent digital-to-analog conversion module. The amplitude shaping of the signal is achieved by connecting multiple digital power amplifiers in parallel, and the output amplitude is adjusted by controlling the number of parallel power amplifiers. In order to filter out high-frequency harmonic signals, the system uses a filter composed of inductors and capacitors. In this design, the number of digital power amplifiers N limits the maximum adjustable output amplitude.

[0006] 2. In order to reduce the power consumption of UWB integrated circuit chips, designers will reduce the sampling rate as much as possible while ensuring that the output spurious requirements are met. In current UWB systems, in order to achieve a bandwidth of at least 500MHz, the industry generally adopts a sampling rate of 2Gsps. However, a higher sampling rate will increase chip power consumption.

[0007] 3. The existing technology shapes the pulse signal in the time domain, which is equivalent to adding a finite impulse response (FIR) filter. The response of this filter is affected by the sampling rate, filter length and fixed-point accuracy. When the sampling rate and accuracy are limited, there is a trade-off between the frequency response of the output signal (including bandwidth and stopband suppression). In particular, when the frequency domain response bandwidth increases, if the sampling rate and fixed-point accuracy remain unchanged, the stopband suppression has to be sacrificed.

[0008] In addition, the existing technology faces challenges in adjusting the coefficients of the pulse shaping module to change the frequency response. With a limited number of digital power amplifiers and a limited sampling rate, it is difficult to simultaneously meet the requirements of spectrum width and out-of-band spurious suppression. Either the spectrum width requirement is met but the out-of-band spurious suppression requirement is not met, or the spectrum width requirement is met but the out-of-band spurious suppression requirement is not met.

[0009] At the same time, UWB communication technology standards in different countries have specific requirements for time domain signal templates, such as Figure 2 As attempts are made to increase bandwidth and improve out-of-band spurious rejection, designing time domain waveforms to meet these standards becomes more difficult.

[0010] It should be noted that the information disclosed in the above background technology section is only used for understanding the background of the present application, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0011] The main purpose of the present invention is to overcome the defects existing in the above-mentioned background technology and provide a method for improving UWB bandwidth.

[0012] To achieve the above object, the present invention adopts the following technical solutions:

[0013] A method for increasing UWB bandwidth comprises the following steps:

[0014] S1. Determine the pulse shaping coefficients of the UWB signal based on the required bandwidth and time domain waveform requirements to define the basic shape and frequency characteristics of the signal;

[0015] S2. Based on the power and bandwidth expansion requirements of the UWB signal, the pulse parameters of the injection signal are designed to be combined with the pulse shaping coefficient configured in step S1 to achieve signal bandwidth expansion and ensure that the injection signal meets the power and spurious requirements;

[0016] S3. Calculate the total power of the original UWB signal and the injected signal after synthesis according to the pulse shaping coefficient and the pulse parameters of the injected signal to ensure that it meets the predetermined power requirements and the distribution requirements of the signal in the spectrum;

[0017] S4. Transmitting a synthesized UWB signal, which combines the original signal and the injection signal to achieve bandwidth expansion, wherein the injection signal is injected and transmitted as a redundant signal during the idle period of the original UWB signal, so that the injection signal participates in pulse shaping to obtain a synthesized UWB signal.

[0018] Furthermore, the injection signal is a double-sideband single-tone spurious signal, that is, a baseband signal is a pulse signal of 1,0,1,0,1,0.

[0019] Furthermore, the injection signal is a UWB-like broadband baseband signal, and its peak power is lower than the actual transmission power of the original UWB signal.

[0020] Furthermore, the injection signal is a signal of a digital transmitter architecture or a non-digital transmitter architecture.

[0021] Furthermore, the calculation of the synthesized UWB signal power in step S3 specifically includes:

[0022] Determining a total power based on a predetermined bandwidth and power density of the UWB signal;

[0023] Calculate the power of the injected signal according to the design requirements of the total power and the injected signal to ensure that its power distribution meets the predetermined power control standard;

[0024] Determine the duration range of the injection signal according to the frame format of the UWB signal and the number of bits of the PSDU to ensure that it is injected within the idle period of the UWB signal;

[0025] The length of the injected signal is adjusted to meet the requirements of the pulse amplitude coefficient. Through actual measurement and adjustment, it is ensured that the power and spectrum distribution of the synthetic signal meet the design requirements.

[0026] Furthermore, the power of the injected signal is controlled to be uniformly distributed within a set power range lower than the total power Ptotal of the original UWB signal.

[0027] A computer-readable storage medium stores a computer program, wherein the computer program implements the method for increasing UWB bandwidth when executed by a processor.

[0028] A computer program product comprises a computer program, wherein when the computer program is executed by a processor, the method for increasing the UWB bandwidth is implemented.

[0029] The present invention has the following beneficial effects:

[0030] The present invention provides a method for improving UWB bandwidth, which innovatively injects designed redundant transmission signals into the idle period of the UWB signal. These signals play an important role in forming new pulse coefficients through the pulse shaping process, and effectively expand the bandwidth. The method of the present invention can not only meet the index requirement of the UWB system for 10dB bandwidth, but also improve the flexibility of system design by reducing the design difficulty of spectrum spurious. In the case where the UWB system needs to meet the three indicators of bandwidth, out-of-band suppression and time domain template at the same time, the present invention makes it easier to adjust the time domain signal template by independently adjusting the bandwidth, and can better meet the requirements of different countries for UWB communication technology standards. Through the method of the present invention, while maintaining signal quality, a wider bandwidth can be achieved, the data transmission rate can be increased, and more reliable high-speed wireless access can be provided in dense multipath environments such as indoors. The method of the present invention makes the system more flexible in optimizing time domain waveforms and out-of-band spurious suppression, has good flexibility and effectiveness, and provides strong technical support for the application of UWB technology in mobile phones, wearable devices, smart homes, automobiles and Internet of Things devices.

[0031] Other beneficial effects of the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the architecture diagram of the digital transmitter.

[0033] Figure 2 This is the UWB time domain template diagram.

[0034] Figure 3 The present invention is a general flow chart of a method for improving UWB bandwidth according to an embodiment of the present invention.

[0035] Figure 4 Schematic diagram of spectrum power distribution according to an embodiment of the present invention.

[0036] Figure 5 This is a measured diagram of the original UWB signal displayed through the spectrum analyzer software interface according to an embodiment of the present invention.

[0037] Figure 6 This is a measured diagram with added spurious signals displayed through a spectrum analyzer software interface according to an embodiment of the present invention.

[0038] Figure 7This is a measured diagram of the emission spectrum synthesis displayed through the spectrum analyzer software interface according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope and application of the present invention.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing as well as for coupling or communication.

[0041] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] See also Figure 1 The embodiment of the present invention provides a method for improving UWB bandwidth, comprising the following steps:

[0044] Step S1. Configure UWB pulse coefficients: Determine the pulse shaping coefficients of the UWB signal according to the required bandwidth and time domain waveform requirements to define the basic shape and frequency characteristics of the signal;

[0045] Step S2. Designing the pulse parameters of the injection signal: Based on the power and bandwidth expansion requirements of the UWB signal, designing the pulse parameters of the injection signal, which are used to combine with the pulse shaping coefficient configured in step S1 to achieve signal bandwidth expansion and ensure that the injection signal meets the power and spurious requirements;

[0046] Step S3. Calculate the synthesized UWB signal power: Calculate the total power of the original UWB signal and the injected signal based on the pulse shaping coefficient and the pulse parameters of the injected signal to ensure that it meets the predetermined power requirements and the signal distribution requirements on the spectrum;

[0047] Step S4. Transmitting a synthesized UWB signal: Transmitting a synthesized UWB signal, which combines the original signal and the injection signal to achieve UWB bandwidth expansion, wherein the injection signal is injected and transmitted as a redundant signal during an idle period of the original UWB signal, so that the injection signal participates in pulse shaping to obtain a synthesized UWB signal.

[0048] In some embodiments, the injection signal may be a double-sideband single-tone spurious signal, that is, a pulse signal whose baseband signal is 1, 0, 1, 0, 1, 0.

[0049] In some other embodiments, the injection signal may also be a UWB-like broadband baseband signal, whose peak power is lower than the actual transmission power of the original UWB signal.

[0050] In addition, the injection signal may be a signal of a digital transmitter architecture or a signal of other transmitter architectures.

[0051] In a preferred embodiment, in step S3, calculating the synthesized UWB signal power specifically includes: determining the total power based on the predetermined bandwidth and power density of the UWB signal; calculating the power of the injected signal according to the total power and the design requirements of the injected signal to ensure that its power distribution meets the predetermined power control standard, preferably, the power of the injected signal is controlled to be evenly distributed within a set power range lower than the total power Ptotal of the original UWB signal; determining the duration range of the injected signal according to the frame format of the UWB signal and the number of bits of the PSDU to ensure that it is injected within the idle period of the UWB signal; adjusting the length of the injected signal to meet the requirements of the pulse amplitude coefficient, and ensuring that the power and spectrum distribution of the synthesized signal meet the design requirements through actual measurement and adjustment.

[0052] The specific embodiments of the present invention are further described below.

[0053] The present invention proposes a method for improving UWB bandwidth, which injects redundant transmission signals during the idle period of UWB signals. These redundant signals play an important role in forming new pulse coefficients during the pulse shaping process through their flexible design. By designing the format and pulse coefficient of the redundant transmission signal, it can be ensured that the maximum spectrum density of the injected signal is controlled below 10dB of the normal signal, while ensuring that the bandwidth exceeds 10dB.

[0054] 1. First, design the UWB signal to be transmitted. Design the pulse shaping coefficient according to the time domain template, that is, the spurious template requirements. The bandwidth of this design can be less than 500MHz. Figure 5 The diagram shows a measured schematic diagram of an original UWB signal displayed through a spectrum analyzer software interface in an embodiment of the present invention.

[0055] 2. Next, inject a new transmit pulse signal. This requires updating the pulse coefficient to ensure that the transmit signal meets the power and spurious requirements. Figure 6 This is a schematic diagram of actual measurement of adding spurious signals displayed through a spectrum analyzer software interface in an embodiment of the present invention, in which different pulse coefficients are used.

[0056] 3. Then, perform pulse signal power control calculation.

[0057] like Figure 4 As shown, the total power is set to Ptotal dBm. Ideally, for a bandwidth of 500MHz, according to the 1MHz detection method, the power density of 1MHz is Ptotal-27dB. If the added single tone power is Padd dBm and is evenly distributed on both sides of the signal, the condition of Ptotal-37dB < Padd-3dB < Ptotal-27dB must be met, that is, Ptotal-34dB < Padd < Ptotal-24dB.

[0058] Under the premise of keeping the pulse amplitude power unchanged, the duration Tadd of the injected signal is between 1 / 2500*Tuwb and 1 / 250*Tuwb, where Tuwb is the total duration of the UWB signal. For example, if the physical layer service data unit PSDU is 59 bits and each symbol lasts 128ns, then the total duration Tuwb = (315+40+59)*128ns =52.992us, which results in 21.1688ns < Tadd < 211.688ns. Finally, the length of the injected signal will be adjusted according to the actual measurement of the pulse amplitude coefficient.

[0059] 4. Finally, synthesize the overall transmitted signal spectrum. Figure 7 FIG. 1 is a schematic diagram of the actual measurement of the transmission spectrum synthesis displayed through the spectrum analyzer software interface in an embodiment of the present invention. Figure 7 It can be seen that the bandwidth of the overall transmitted signal is successfully extended to 520MHz, meeting the protocol requirements.

[0060] In the above example, the injected transmission baseband signal is a double-sideband single-tone spurious signal, that is, during the transmission process, the baseband signal is in the form of 1, 0, 1, 0, 1, 0 pulses, the baseband rate is 500Msps, the pulse coefficient is [-3 -1 1 3 31 -1 -3], the pulse sampling rate is 2Gsps, and these injection signals are injected during the idle period of the UWB signal. As an alternative embodiment, a UWB-like broadband baseband signal can also be injected during the transmission process, and its peak power is designed to be lower than the actual transmission power.

[0061] The method of the present invention is not only applicable to digital transmitters, but also to other transmitter architectures. That is, after transmitting the UWB signal, other types of signals can be injected to ensure that the final output signal meets the UWB bandwidth requirements.

[0062] In summary, the present invention proposes an innovative method for increasing the bandwidth of an ultra-wideband (UWB) signal by injecting a specially designed redundant transmission signal into an idle period of the UWB signal.

[0063] These redundant signals play a key role in forming new pulse coefficients during the pulse shaping process through their flexible design, effectively expanding the bandwidth. This method not only meets the UWB system's 10dB bandwidth requirement, but also improves the flexibility of system design by reducing the difficulty of designing spectrum spurious. In addition, the ability to independently adjust the bandwidth makes it easier to adjust the time domain signal template, meeting the specific requirements of different countries for UWB communication technology standards. This method achieves wider bandwidth and higher data transmission rate while maintaining signal quality, and is particularly suitable for high-speed wireless access in dense multipath environments such as indoors. The method of the present invention provides strong technical support for the application of UWB technology in mobile phones, wearable devices, smart homes, automobiles, and Internet of Things devices, and has good flexibility and effectiveness.

[0064] An embodiment of the present invention further provides a storage medium for storing a computer program, which at least performs the above method when executed.

[0065] An embodiment of the present invention further provides a control device, comprising a processor and a storage medium for storing a computer program; wherein the processor is configured to execute at least the method described above when executing the computer program.

[0066] An embodiment of the present invention further provides a processor, wherein the processor executes a computer program and at least executes the method described above.

[0067] The storage medium can be implemented by any type of non-volatile storage device, or a combination thereof. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a ferromagnetic random access memory (Flash Memory), a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The storage medium described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

[0068] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0069] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0070] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0071] A person skilled in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), disks or optical disks, etc. Various media that can store program codes.

[0072] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

[0073] The methods disclosed in the several method embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method embodiments.

[0074] The features disclosed in several product embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new product embodiments.

[0075] The features disclosed in several method or device embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0076] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for increasing UWB bandwidth, characterized in that: The following steps are involved: S1. Determine the pulse shaping coefficients of the UWB signal based on the required bandwidth and time domain waveform requirements to define the basic shape and frequency characteristics of the signal; S2. Based on the power and bandwidth expansion requirements of the UWB signal, the pulse parameters of the injection signal are designed to be combined with the pulse shaping coefficient configured in step S1 to achieve signal bandwidth expansion and ensure that the injection signal meets the power and spurious requirements; S3. Calculate the total power of the original UWB signal and the injected signal after synthesis according to the pulse shaping coefficient and the pulse parameters of the injected signal to ensure that it meets the predetermined power requirements and the distribution requirements of the signal in the spectrum; S4. Transmitting a synthesized UWB signal, which combines the original signal and the injection signal to achieve bandwidth expansion, wherein the injection signal is injected and transmitted as a redundant signal during an idle period of the original UWB signal, so that the injection signal participates in pulse shaping to obtain a synthesized UWB signal; The calculation of the synthesized UWB signal power in step S3 specifically includes: Determining a total power based on a predetermined bandwidth and power density of the UWB signal; Calculate the power of the injected signal according to the design requirements of the total power and the injected signal to ensure that its power distribution meets the predetermined power control standard; Determine the duration range of the injection signal according to the frame format of the UWB signal and the number of bits of the PSDU to ensure that it is injected within the idle period of the UWB signal; The length of the injected signal is adjusted to meet the requirements of the pulse amplitude coefficient. Through actual measurement and adjustment, it is ensured that the power and spectrum distribution of the synthetic signal meet the design requirements.

2. The method for increasing UWB bandwidth as claimed in claim 1, characterized in that: The injection signal is a double-sideband single-tone spurious signal, that is, a baseband signal is a pulse signal of 1,0,1,0,1,0.

3. The method for increasing UWB bandwidth as claimed in claim 1, characterized in that: The injection signal is a UWB-like broadband baseband signal, and its peak power is lower than the actual transmission power of the original UWB signal.

4. The method for increasing UWB bandwidth as claimed in claim 1, characterized in that: The injection signal is a signal of a digital transmitter architecture or a signal of a non-digital transmitter architecture.

5. The method for increasing UWB bandwidth according to any one of claims 1 to 3, characterized in that: The power of the injected signal is controlled to be uniformly distributed within a set power range that is lower than the total power Ptotal of the original UWB signal.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for increasing UWB bandwidth according to any one of claims 1 to 5 is implemented.

7. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for increasing UWB bandwidth according to any one of claims 1 to 5 is implemented.

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