CN115001529B - Wireless light-oriented communication perception integrated waveform generation method and device - Google Patents
Wireless light-oriented communication perception integrated waveform generation method and device Download PDFInfo
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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- H—ELECTRICITY
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Abstract
The application discloses a method and a device for generating communication perception integrated waveforms facing wireless light, wherein the method comprises the following steps: carrying out channel coding and interleaving treatment on communication data, framing the treated data according to the modulation order of pulse position modulation, and generating a pulse position modulation frame; mapping the pulse position modulation frame into a pulse position modulation symbol according to a preset mapping rule, and performing spread spectrum processing on the pulse position modulation symbol by utilizing a preset spread spectrum sequence to obtain a spread spectrum pulse position modulation symbol; and performing pulse shaping and digital-to-analog conversion processing on the spread pulse position modulation symbol to generate a communication perception integrated waveform for laser radar emission. Therefore, the method solves the technical problems that the pulse position modulation and spread spectrum sequence based characteristics are not considered, various constraint conditions cannot be met, design complexity is increased, interference among users cannot be restrained, communication safety is reduced and the like in the related technology in communication perception integrated design.
Description
Technical Field
The application relates to the technical field of communication and laser radar, in particular to a method and a device for generating communication perception integrated waveforms for wireless light.
Background
With the development of information technology, electronic devices need to perform various tasks such as communication, detection, identification and the like, and if independent communication and sensing devices are used, not only are the volume excessively large and system resources wasted, but also interference problems caused by spectrum overlapping need to be solved.
In the related technology, the communication perception integrated technology realizes unified design of communication and perception functions through means of signal joint design, hardware sharing and the like, so that the overall performance and business capability of the system are improved, and the communication perception integrated technology is widely focused in academia and industry.
However, in the related art, the current research on communication perception integration is concentrated on radio frequency bands such as millimeter waves, which results in limited bandwidth, so that the communication rate is reduced, system resources are wasted, the radio frequency band in the related art has strong penetrating power, mutual interference among users cannot be restrained, further, the communication safety is reduced, and communication perception integration cannot be realized in a scene with poor performance, so that the practicability is lower, and improvement is needed.
Disclosure of Invention
The application provides a method and a device for generating a communication perception integrated waveform for wireless light, which are used for solving the technical problems that in the related art, the characteristics based on pulse position modulation and spread spectrum sequences are not considered during communication perception integrated research, various constraint conditions cannot be met, design complexity is increased, flexibility is reduced, mutual interference among users cannot be restrained, communication safety is reduced, the use requirements of users cannot be met and the like.
An embodiment of a first aspect of the present application provides a method for generating a communication perception integrated waveform for wireless light, including the following steps: carrying out channel coding and interleaving treatment on communication data to obtain processed data, framing the processed data according to the modulation order of pulse position modulation, and generating a pulse position modulation frame; mapping the pulse position modulation frame into a pulse position modulation symbol according to a preset mapping rule, and performing spread spectrum processing on the pulse position modulation symbol by utilizing a preset spread spectrum sequence to obtain a spread spectrum pulse position modulation symbol; and performing pulse shaping and digital-to-analog conversion processing on the spread pulse position modulation symbol to generate a communication perception integrated waveform for laser radar transmission.
Optionally, in one embodiment of the present application, before performing channel coding and interleaving processing on the communication data, the method further includes: at least one system parameter is determined based on the current communication and perceived needs. Optionally, in one embodiment of the present application, the determining at least one system parameter according to the current communication and perception requirements includes: determining a pulse repetition interval according to the refresh rate requirement; and/or determining the guard interval according to the maximum non-ambiguous distance.
Optionally, in an embodiment of the present application, the determining at least one system parameter according to the current communication and sensing requirements further includes: determining the modulation order of pulse position modulation according to the maximum communication rate requirement, the pulse repetition interval and the guard interval; determining the type and length of a spread spectrum sequence according to the error rate requirement and the modulation order to obtain a symbol rate for spread spectrum processing; the encoding rate for the encoding process is determined based on the user payload communication rate requirement and the maximum communication rate requirement.
Optionally, in an embodiment of the present application, the framing the processed data according to a modulation order of pulse position modulation includes: grouping the processed data bit stream according to the number of bits transmitted in each time slot, and obtaining the pulse position modulation frame by the pulse position modulation frame formed by each group of bits.
Optionally, in an embodiment of the present application, the preset mapping rule encodes a binary pulse position modulation frame into a pulse position serving as a start position of a pulse in a time slot, and sets a preset symbol to a high level continuously after the start position, where a length of the preset symbol is equal to a length of the preset spreading sequence.
An embodiment of a second aspect of the present application provides a device for generating a communication perception integrated waveform for wireless light, including: the first processing module is used for carrying out channel coding and interleaving processing on communication data to obtain processed data, framing the processed data according to the modulation order of pulse position modulation and generating a pulse position modulation frame; the second processing module is used for mapping the pulse position modulation frame into a pulse position modulation symbol according to a preset mapping rule, and performing spread spectrum processing on the pulse position modulation symbol by utilizing a preset spread spectrum sequence to obtain a spread spectrum pulse position modulation symbol; the generating module is used for carrying out pulse forming and digital-to-analog conversion processing on the spread pulse position modulation symbol to generate a communication perception integrated waveform which can be transmitted by the laser radar.
Optionally, in an embodiment of the present application, the apparatus of the embodiment of the present application further includes: and the acquisition module is used for determining at least one system parameter according to the current communication and perception requirements.
Optionally, in an embodiment of the present application, the acquiring module is further configured to determine a pulse repetition interval according to a refresh rate requirement, and/or determine a guard interval according to a maximum non-ambiguity distance.
Optionally, in an embodiment of the present application, the obtaining module is further configured to determine a modulation order of pulse position modulation according to a maximum communication rate requirement, the pulse repetition interval, and the guard interval, determine a kind and a length of a spreading sequence according to an error rate requirement and the modulation order, obtain a symbol rate for spreading, and determine a coding rate for coding according to a user payload communication rate requirement and the maximum communication rate requirement.
Optionally, in an embodiment of the present application, the first processing module is further configured to group the processed data bit stream according to a number of bits transmitted in each time slot, and a pulse position modulation frame formed by each group of bits obtains the pulse position modulation frame. Optionally, in an embodiment of the present application, the preset mapping rule encodes a binary pulse position modulation frame into a pulse position serving as a start position of a pulse in a time slot, and sets a preset symbol to a high level continuously after the start position, where a length of the preset symbol is equal to a length of the preset spreading sequence.
An embodiment of a third aspect of the present application provides an electronic device, including: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the generation method of the wireless light-oriented communication perception integrated waveform.
A fourth aspect of the present application provides a computer-readable storage medium storing computer instructions for causing the computer to perform the method for generating a wireless-light-oriented communication perception integration waveform according to the above embodiment.
The embodiment of the application can realize communication perception coexistence based on an optical frequency band, can realize ultrahigh communication rate, and is based on the characteristics of pulse position modulation and spread spectrum sequences, thereby meeting various constraint conditions, improving design flexibility, simultaneously, the light has reduced penetration, effectively reducing mutual interference among users and improving communication safety. Therefore, the method solves the technical problems that in the related art, when communication perception is integrally researched, the characteristics based on pulse position modulation and spread spectrum sequences are not considered, various constraint conditions cannot be met, design complexity is increased, flexibility is reduced, mutual interference among users cannot be restrained, communication safety is reduced, and the use requirements of the users cannot be met.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
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The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flowchart of a method for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application;
fig. 2 is a flowchart of a method for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application;
FIG. 3 is a graph illustrating bit error rate curves when spreading sequences of different lengths are used according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an integrated waveform frame structure according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an integrated waveform frame structure for use in an Internet of vehicles system according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an integrated waveform frame structure for use in an indoor communication and positioning system, in accordance with one embodiment of the present application;
FIG. 7 is a schematic diagram of a hardware system implementing integrated waveforms according to an embodiment of the present application;
Fig. 8 is a schematic structural diagram of an apparatus for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The following describes a method and a device for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application with reference to the accompanying drawings. Aiming at the problems that in the related art mentioned in the background technology center, the characteristics based on pulse position modulation and spread spectrum sequences are not considered, various constraint conditions cannot be met, design complexity is increased, flexibility is reduced, mutual interference among users cannot be restrained, and communication safety is reduced, and the method for generating the communication perception integrated waveform for the wireless light is provided. Therefore, the method solves the technical problems that in the related art, when communication perception is integrally studied, the characteristics based on pulse position modulation and spread spectrum sequences are not considered, various constraint conditions cannot be met, design complexity is increased, flexibility is reduced, mutual interference among users cannot be restrained, communication safety is reduced, and use experience of the users is reduced.
Specifically, fig. 1 is a flow chart of a method for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application.
As shown in fig. 1, the method for generating the communication perception integrated waveform for the wireless light comprises the following steps:
in step S101, channel coding and interleaving are performed on the communication data to obtain processed data, and the processed data is framed according to the modulation order of pulse position modulation to generate a pulse position modulation frame.
It can be understood that the embodiment of the application aims to solve the problem of low communication rate in the communication perception integrated design, hopefully can adopt pulse system signals and time-of-flight ranging for applying amplitude modulation/direct detection based on the characteristics of an optical frequency band, adopts pulse position modulation to load communication information, carries out channel coding, interleaving processing and data framing on communication data, and generates pulse position modulation frames, thereby improving the communication perception communication rate and the design flexibility.
In one embodiment of the present application, before the channel coding and interleaving process is performed on the communication data, the method further comprises: at least one system parameter is determined based on the current communication and perceived needs.
Specifically, prior to processing the communication data and interleaving, embodiments of the present application may first determine system parameters from the communication and perceived needs, including but not limited to: the modulation order of the pulse position modulation is determined according to the maximum communication rate requirement, the pulse repetition interval and the guard interval. For example, the kind and length of the spread spectrum sequence are determined according to the error rate requirement and the modulation order, and then the symbol rate of spread spectrum communication is determined; the coding rate is determined according to the payload communication rate requirement and the maximum communication rate requirement of the user, so that various constraint conditions such as refresh rate, maximum non-fuzzy distance, communication rate, error rate and the like can be met, and the flexibility of communication perception integrated design is effectively improved.
Optionally, in one embodiment of the present application, determining at least one system parameter based on current communication and perceived needs includes: determining a pulse repetition interval according to the refresh rate requirement; and/or determining the guard interval according to the maximum non-ambiguous distance.
It will be appreciated that there are a variety of system parameters for which the communication and sensing requirements of the communication-sensing integrated design can be determined, such as determining the pulse repetition interval based on refresh rate requirements, and determining the guard interval based on the maximum unblurred distance. In order to improve flexibility of communication perception integrated design, the embodiment of the application takes a generation method of wireless light-oriented communication perception integrated waveforms as an example, and system parameters of the embodiment of the application are described in an example.
Specifically, as shown in fig. 2, a wireless light-oriented communication perception integrated waveform system parameter design method includes:
s201: determining pulse repetition interval T based on radar refresh rate requirements slot . Specifically, in this embodiment, each time an integrated waveform is transmitted and a corresponding reflected waveform is received, the radar ranging refresh is regarded as one time, and since the integrated waveform adopts pulse position modulation, the interval between two adjacent refreshes is not fixed; if the probability of the pulse occurring at each location does not change over time, the radar refresh rate can be considered equal to the slot rate on average:
wherein R is sym For the communication symbol rate, N is the ratio of the slot length to the communication symbol length and need not be an integer. In practice, the slot rate should be no lower than the radar required brushNew rate.
S202: according to the maximum non-blurring distance D max Determining a guard interval T g . Specifically, if the reflected waveform of the integrated waveform returns after the next start of transmitting the waveform, the system cannot determine the transmitting time corresponding to the reflected waveform, and the target exceeds the maximum non-blurring distance; in order to achieve the required maximum unambiguous distance, it is necessary to ensure that the time interval between two transmissions is greater than the guard interval:
Wherein c 0 Light velocity, T, in an integrated waveform application environment g Is a guard interval.
Optionally, in one embodiment of the present application, determining at least one system parameter according to current communication and perceived needs further comprises: determining the modulation order of pulse position modulation according to the maximum communication rate requirement, pulse repetition interval and guard interval; determining the type and length of a spread spectrum sequence according to the error rate requirement and the modulation order to obtain a symbol rate for spread spectrum processing; the encoding rate for the encoding process is determined based on the user payload communication rate requirement and the maximum communication rate requirement.
In the actual implementation process, the embodiment of the application takes a wireless light-oriented communication perception integrated waveform generation method as an example, and the following describes system parameters by way of example.
Specifically, as shown in fig. 2, a wireless light-oriented communication perception integrated waveform system parameter design manner further includes:
s203: according to the maximum communication rate requirement C max The modulation order is determined. In particular, due to a K-order pulse position modulationA number of bits, the modulation order therefore needs to satisfy the following inequality:
wherein C is max Is the maximum communication rate requirement.
To facilitate mapping between symbols and bits, K is typically raised to a power of 2:
K＝2 k (4)
s204: and determining the type and the length of the spread spectrum sequence according to the error rate requirement. Specifically, if m-sequence spreading is used and k=32, an appropriate spreading sequence length L may be selected according to the bit error rate curve provided in fig. 3.
Specifically, as shown in fig. 3, when spreading sequences with different lengths are selected, a bit error rate curve of the pulse position modulation symbol is decided by calculating a correlation function. In the embodiment of the application, the system parameters are as follows: time slot length T slot Guard interval t=12.8 μs g =2μs, modulation order k=32, spread with m-sequence of length l= 15,31,63,127, raised cosine pulse shaping; the simulation is added with interference signals with relative strength of 0dB, different spreading sequences and asynchronism, and the error rate is studied under different signal-to-interference-and-noise ratios. It can be seen that both a higher signal-to-noise ratio and a longer spreading sequence help to reduce the bit error rate.
It should be noted that in determining the pulse repetition interval T slot Guard interval T g After the modulation order K and the spreading sequence length L, the communication symbol rate in the time slot is also determined:
wherein T is slot For repeating intervals, T g The guard interval is defined as K, the modulation order is defined as K, and the spreading sequence length is defined as L.
Since the symbol rate is proportional to the 3dB bandwidth B sym =βb, β is a scaling factor related to the impulse response of the pulse shaping filter, so it is necessary to verify whether the integrated waveform meets the bandwidth constraint, and if not, it is necessary to redesign the system parameters.
S205: according to user payload communication rate requirement C user Determining coding rate R coding . Specifically, since K is typically raised to a power of 2 and there is a fluctuation in user payload communication rate demand, the bit stream to be transmitted needs to be rate matched with the integrated waveform communication by encoding at the rate:
wherein C is user For user payload communication rate requirements, R coding Is the coding rate.
Optionally, in one embodiment of the present application, framing the processed data according to the modulation order of the pulse position modulation includes: and grouping the processed data bit stream according to the number of bits transmitted by each time slot, and obtaining a pulse position modulation frame by a pulse position modulation frame formed by each group of bits.
It can be understood that the embodiment of the application performs channel coding and interleaving on communication data to obtain processed data, groups the processed data bit stream according to the number of bits transmitted by each time slot, and pulse position modulation frames formed by each group of bits to obtain pulse position modulation frames, thereby performing spread spectrum processing and reducing design complexity.
In step S102, the pulse position modulation frame is mapped to a pulse position modulation symbol according to a preset mapping rule, and spread spectrum processing is performed on the pulse position modulation symbol by using a preset spread spectrum sequence, so as to obtain a spread spectrum pulse position modulation symbol.
It can be understood that, in the embodiment of the present application, the pulse position modulation frame may be converted into a pulse position to obtain a pulse position modulation symbol, and the pulse position modulation symbol is spread by using a preset spreading sequence, for example, the method includes: and carrying out binary multiplication on the binary spread spectrum sequence and continuous high-level symbols in the time slot to realize spread spectrum, and obtaining spread-spectrum pulse position modulation symbols.
As a possible implementation manner, as shown in fig. 2, according to the system parameters, the embodiment of the present application may generate a communication perception integrated waveform facing wireless light through the following steps:
s206: and carrying out channel coding and interleaving on the communication data to obtain processed data. It should be noted that any block code, convolutional code, polar code that meets the coding rate requirement is suitable for the scenario of the embodiment of the present application; channel coding can improve the anti-noise performance of communications; the coded data is interleaved, so that the burst error resistance can be further improved.
S207: and framing the processed data. Specifically, the processed data is divided into k bits for each group, and a pulse position modulation frame is constituted.
S208: and mapping the pulse position modulation frame to the pulse position to obtain a pulse position modulation symbol. Specifically, in the embodiment of the present application, k bits a of one frame 0 a 1 …a k-1 Mapped to the P-th symbol position:
it should be noted that, to facilitate subsequent spreading, the pulse position modulation is "overlapped", i.e. one pulse position modulation symbol actually occupies L symbol positions (P, p+1, … p+l-1), and the pulse position modulation symbol can be expressed as:
wherein T is s Is the digital signal sampling period.
Rectangular window function:
s209: the pulse position modulation symbols are spread with a spreading sequence c. Specifically, unipolar real spreading sequences are suitable for use in the present implementationExample scenes such as m-sequences, gold sequences, chaotic sequences, etc.; spreading sequence c= (c) with length L 0 ,c 1 ,…c L-1 ),c i E {0,1} exactly corresponds to the L symbol positions occupied by the pulse position modulation symbols, the spread pulse position modulation symbols can be expressed as:
optionally, in one embodiment of the present application, the preset mapping rule is to encode a binary pulse position modulation frame into a pulse position as a start position of a pulse in a time slot, and set a preset symbol to be high level continuously after the start position, where a length of the preset symbol is equal to a length of a preset spreading sequence.
Specifically, as shown in FIG. 4, a spread pulse position modulation symbol s is shown 1 [n]Each frame is of length N symbols, N not necessarily being an integer; wherein the first (k+l-1) symbols are the positions that the pulse position modulation symbols may occupy; the initial position of the spread spectrum sequence occupying L continuous symbol lengths is at the P symbol position, and P epsilon {0,1, …, K-1} is mapped by a pulse position modulation frame; each bit of the spreading sequence occupies a symbol position.
In step S103, pulse shaping and digital-to-analog conversion processing are performed on the spread pulse position modulation symbol, so as to generate a communication perception integrated waveform for the laser radar to transmit.
It can be understood that, in the embodiment of the application, the spread pulse position modulation symbol is subjected to pulse forming and digital-to-analog conversion to obtain the communication perception integrated waveform, so that the coexistence of communication perception is realized, the compromise between the communication and the perception performance can be carried out according to the actual demands of users, the design flexibility is effectively improved, the realization complexity is reduced, and the interference suppression between users can be realized under the condition that multiple users work simultaneously.
Further, as shown in the "integrated waveform generation" section of fig. 2, according to the above system parameters, an embodiment of the present application may include the following steps:
S210: and sequentially carrying out pulse forming and digital-to-analog conversion on the spread pulse position modulation symbols to obtain a communication perception integrated waveform with limited bandwidth and capable of being transmitted by the laser radar. Specifically, the side lobe of the rectangular pulse spectrum is too high, the spectrum leakage is serious, and the rectangular pulse spectrum is not suitable for laser radar transmission, in this embodiment, raised cosine pulse is adopted as impulse response of the pulse shaping filter:
the integrated waveform digital signal passing through the pulse shaping filter can be expressed as:
the digital signals are subjected to any digital-to-analog converter meeting the bandwidth requirement to obtain an integrated waveform analog signal which can be transmitted, and the integrated waveform analog signal is transmitted to a free space through an electric-to-optical converter of the laser radar, so that the generation of the communication perception integrated waveform facing the wireless light is completed.
In some embodiments, the embodiments of the present application can implement communication sensing integration in a scene with poor performance of a traditional wireless frequency band such as the internet of vehicles by using the lidar and amplitude modulation/direct detection.
As shown in fig. 5, the communication perception integrated waveform frame structure of the laser radar is suitable for the internet of vehicles system. In an Internet of vehicles system, the laser radar refresh rate is required to refresh every 0.1ms, and the maximum detection distance is D max =300 m; the communication capacity between vehicles needs up to 100kbps to exchange information of auxiliary driving such as distance, speed, steering intention, braking intention and the like, and the error rate is not more than 10 -4 The method comprises the steps of carrying out a first treatment on the surface of the The 3dB bandwidth of the laser radar transmit waveform does not exceed 10MHz. For the system, the slot length T slot Guard interval t=12.8 μs g =2μs; modulation order k=32, i.e. transmitting k=5 bit signal per pulse position modulation symbolMessage, maximum communication rate C max ≈391kbps>100kbps; using m-sequence spreading, length l=63, can ensure BER at sinr≡ -10dB<10 -4 The method comprises the steps of carrying out a first treatment on the surface of the Symbol rate R sym And (3) the bandwidth B is approximately equal to 196kHz, which is approximately equal to 8.70Msymbol/s and is formed by raised cosine pulse. It can be seen that the system design requirements are fully satisfied.
Further, as shown in fig. 6, a communication perception integrated waveform frame structure for indoor application of the lidar is provided. In an indoor communication and positioning system, the laser radar refresh rate is required to refresh every 1ms, and the maximum detection distance is D max =15m; the user terminal needs up to 10Mbps communication capacity, and the error rate is not more than 10 -4 The method comprises the steps of carrying out a first treatment on the surface of the The 3dB bandwidth of the laser radar transmit waveform does not exceed 10MHz. For the system, the slot length T slot Guard interval t=500 ns g =100 ns; modulation order k=32, i.e. k=5 bit information is transmitted per pulse position modulation symbol, maximum communication rate C max =10 Mbps; using m-sequence spreading, length l=31, can ensure BER at sinr≡5dB<10 -4 The method comprises the steps of carrying out a first treatment on the surface of the Symbol rate R sym 155Msymbol/s, with Gaussian pulse shaping, 3dB bandwidth B of 3.33MHz. It can be seen that the system design requirements are fully satisfied.
Therefore, the communication perception integrated waveform design based on the pulse position modulation and spread spectrum sequence has good engineering feasibility.
The working principle of the embodiment of the present application will be described in detail with reference to a specific embodiment, as shown in fig. 7.
Specifically, as shown in fig. 7, the embodiment of the present application includes the following steps:
parameter control step 701: the method is used for sequentially determining system parameters such as pulse repetition interval, guard interval, modulation order, symbol rate, coding rate, spread spectrum sequence type and length and the like according to radar refresh rate, maximum non-ambiguity distance, maximum communication rate requirement, bit error rate requirement and user payload communication rate requirement, and controlling the generation of integrated waveforms. The parameter control may be a CPU (Central Processing Unit ), PGA (Programmable Gate Array, programmable gate array), field FPGA (Field Programmable Gate Array, programmable gate array), or ASIC (Application Specific Integrated Circuit ) with appropriate combinational and sequential logic.
Channel coding and interleaving step 702: and carrying out channel coding and interleaving on the input communication data according to a preset coding and interleaving scheme to obtain interleaved data. If the block code/convolutional code/Polar code is used for channel coding, the control of channel coding can be implemented by using a block code/convolutional code/Polar code encoder circuit.
Framing step 703: the interleaved data is divided into pulse position modulation frames according to a preset frame length, and a counting circuit with a counting period equal to the frame length can be used for realizing the function.
Pulse position modulation step 704: and setting the symbol with the preset length in the time slot to be high level according to the preset mapping mode and the input pulse position modulation frame. Wherein binary pulse position modulation frames can be converted into one-hot pulse positions by an encoder and the start time of the high level is controlled by a counting circuit of a period variable, and the duration of the high level is controlled by a counting circuit of another fixed period.
Spread sequence generation step 705: and generating a spread spectrum sequence with a preset length, wherein when m-sequence spread spectrum is adopted, a shift register and a modulo 2 arithmetic circuit can be used for generating the spread spectrum sequence.
Spreading step 706: and spreading the pulse position modulation symbol by using a spreading sequence to obtain a spread pulse position modulation symbol. In particular, the spread spectrum operation may be accomplished with a binary multiplier.
Pulse shaping, digital to analog conversion, photoelectric conversion step 707: the spread pulse position modulation symbol is converted into a communication perception integrated waveform digital signal with limited bandwidth, the integrated waveform digital signal is converted into an integrated waveform analog signal, and finally the integrated waveform signal is converted into an integrated waveform capable of being propagated in a free space through photoelectric conversion. Specifically, the impulse response of the pulse shaping filter is stored in a buffer memory, the buffer memory is read when the input symbol is high level, an integrated waveform digital signal can be generated, digital-to-analog conversion can be used, but not limited to, resistance type D/A, weight capacitance type D/A and weight current type D/A, and a laser diode can be used for the photoelectric converter.
According to the wireless light-oriented communication perception integrated waveform generation method provided by the embodiment of the application, communication perception coexistence can be realized based on an optical frequency band, ultrahigh communication rate can be realized, and based on the characteristics of pulse position modulation and spread spectrum sequences, various constraint conditions are met, so that communication perception coexistence is realized, and moreover, compromise between communication and perception performance can be carried out according to actual demands of users, so that design flexibility is effectively improved, meanwhile, light has reduced penetrating power, mutual interference among users is effectively reduced, and communication safety is improved.
Next, a device for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 8 is a block schematic diagram of a device for generating a communication perception integrated waveform for wireless light according to an embodiment of the present application.
As shown in fig. 8, the wireless-optical-oriented communication perception integrated waveform generating apparatus 10 includes: a first processing module 100, a second processing module 200, and a generation module 300.
Specifically, the first processing module 100 is configured to perform channel coding and interleaving processing on communication data to obtain processed data, and frame the processed data according to a modulation order of pulse position modulation, so as to generate a pulse position modulation frame.
The second processing module 200 is configured to map the pulse position modulation frame to a pulse position modulation symbol according to a preset mapping rule, and perform spread spectrum processing on the pulse position modulation symbol by using a preset spread spectrum sequence, so as to obtain a spread pulse position modulation symbol.
The generating module 300 is configured to perform pulse shaping and digital-to-analog conversion processing on the spread pulse position modulation symbol, and generate a communication perception integrated waveform for laser radar transmission.
Optionally, in an embodiment of the present application, the apparatus 10 of the embodiment of the present application further includes: and an acquisition module.
The acquisition module is used for determining at least one system parameter according to the current communication and perception requirements.
Optionally, in an embodiment of the present application, the acquisition module is further configured to determine the pulse repetition interval according to a refresh rate requirement, and/or determine the guard interval according to a maximum non-ambiguous distance.
Optionally, in an embodiment of the present application, the obtaining module is further configured to determine a modulation order of pulse position modulation according to a maximum communication rate requirement, a pulse repetition interval, and a guard interval, determine a type and a length of a spreading sequence according to an error rate requirement and the modulation order, obtain a symbol rate for spreading, and determine a coding rate for coding according to a user payload communication rate requirement and the maximum communication rate requirement.
Optionally, in an embodiment of the present application, the first processing module 100 is further configured to group the processed data bit stream according to the number of bits transmitted in each time slot, and the pulse position modulation frame formed by each group of bits obtains the pulse position modulation frame.
Optionally, in one embodiment of the present application, the preset mapping rule is to encode a binary pulse position modulation frame into a pulse position as a start position of a pulse in a time slot, and set a preset symbol to be high level continuously after the start position, where a length of the preset symbol is equal to a length of a preset spreading sequence.
The explanation of the foregoing embodiment of the method for generating a communication perception integrated waveform for wireless light is also applicable to the device for generating a communication perception integrated waveform for wireless light of this embodiment, and will not be repeated here.
According to the wireless light-oriented communication perception integrated waveform generating device provided by the embodiment of the application, communication perception coexistence can be realized based on an optical frequency band, ultrahigh communication rate can be realized, and based on the characteristics of pulse position modulation and spread spectrum sequences, various constraint conditions are met, so that communication perception coexistence is realized, and moreover, compromise between communication and perception performance can be carried out according to actual demands of users, so that design flexibility is effectively improved, meanwhile, light has reduced penetrating power, mutual interference among users is effectively reduced, and communication safety is improved.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may include:
memory 901, processor 902, and a computer program stored on memory 901 and executable on processor 902.
The processor 902 implements the method for generating a communication perception integrated waveform for wireless light provided in the above embodiment when executing a program.
Further, the electronic device further includes:
a communication interface 903 for communication between the memory 901 and the processor 902.
Memory 901 for storing a computer program executable on processor 902.
Memory 901 may comprise high-speed RAM memory or may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
If the memory 901, the processor 902, and the communication interface 903 are implemented independently, the communication interface 903, the memory 901, and the processor 902 may be connected to each other through a bus and perform communication with each other. The bus may be an industry standard architecture (Industry Standard Architecture, abbreviated ISA) bus, an external device interconnect (Peripheral Component, abbreviated PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 9, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 901, the processor 902, and the communication interface 903 are integrated on a chip, the memory 901, the processor 902, and the communication interface 903 may communicate with each other through internal interfaces.
The processor 902 may be a central processing unit (Central Processing Unit, abbreviated as CPU) or an application specific integrated circuit (Application Specific Integrated Circuit, abbreviated as ASIC) or one or more integrated circuits configured to implement embodiments of the present application.
The present embodiment also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above method for generating a wireless-light-oriented communication awareness integrated waveform.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. The method for generating the communication perception integrated waveform for the wireless light is characterized by comprising the following steps of:
determining at least one system parameter based on the current communication and perception requirements, wherein the determining at least one system parameter based on the current communication and perception requirements comprises: determining a pulse repetition interval according to the refresh rate requirement and/or determining a guard interval according to the maximum non-ambiguity distance;
carrying out channel coding and interleaving treatment on communication data to obtain processed data, framing the processed data according to the modulation order of pulse position modulation, and generating a pulse position modulation frame;
mapping the pulse position modulation frame into a pulse position modulation symbol according to a preset mapping rule, and performing spread spectrum processing on the pulse position modulation symbol by utilizing a preset spread spectrum sequence to obtain a spread spectrum pulse position modulation symbol; and
And performing pulse shaping and digital-to-analog conversion processing on the spread pulse position modulation symbol to generate a communication perception integrated waveform for laser radar transmission.
2. The method of claim 1, wherein said determining at least one system parameter based on current communication and perceived needs further comprises:
determining the modulation order of pulse position modulation according to the maximum communication rate requirement, the pulse repetition interval and the guard interval;
determining the type and length of a spread spectrum sequence according to the error rate requirement and the modulation order to obtain a symbol rate for spread spectrum processing;
the encoding rate for the encoding process is determined based on the user payload communication rate requirement and the maximum communication rate requirement.
3. The method of claim 1, wherein framing the processed data according to a modulation order of pulse position modulation comprises:
grouping the processed data bit stream according to the number of bits transmitted in each time slot, and obtaining the pulse position modulation frame by the pulse position modulation frame formed by each group of bits.
4. The method of claim 1, wherein the predetermined mapping rule is to encode a binary pulse position modulation frame as a pulse position that is a start position of a pulse in a time slot, and to set a predetermined number of symbols, which are consecutive after the start position, to a high level, and the predetermined number of symbols has a length equal to a length of the predetermined spreading sequence.
5. A device for generating a communication perception integrated waveform for wireless light, comprising:
an acquisition module, configured to determine at least one system parameter according to a current communication and sensing requirement, where the determining at least one system parameter according to the current communication and sensing requirement includes: determining a pulse repetition interval according to the refresh rate requirement and/or determining a guard interval according to the maximum non-ambiguity distance;
the first processing module is used for carrying out channel coding and interleaving processing on communication data to obtain processed data, framing the processed data according to the modulation order of pulse position modulation and generating a pulse position modulation frame;
the second processing module is used for mapping the pulse position modulation frame into a pulse position modulation symbol according to a preset mapping rule, and performing spread spectrum processing on the pulse position modulation symbol by utilizing a preset spread spectrum sequence to obtain a spread spectrum pulse position modulation symbol; and
the generating module is used for carrying out pulse forming and digital-to-analog conversion processing on the spread pulse position modulation symbol to generate a communication perception integrated waveform which can be transmitted by the laser radar.
6. The apparatus of claim 5 wherein the acquisition module is further configured to determine a modulation order for pulse position modulation based on a maximum communication rate requirement, the pulse repetition interval, and the guard interval, and determine a type and a length of a spreading sequence based on an error rate requirement and the modulation order, to obtain a symbol rate for spreading, and to determine a coding rate for coding based on a user payload communication rate requirement and the maximum communication rate requirement.
7. The apparatus of claim 5, wherein the first processing module is further configured to group the processed data bit stream by a number of bits transmitted per slot, and wherein the pulse position modulated frames are derived from pulse position modulated frames formed by each group of bits.
8. The apparatus of claim 5, wherein the predetermined mapping rule is to encode a binary pulse position modulation frame as a pulse position that is a start position of a pulse in a time slot, and to set a predetermined number of symbols, which are consecutive after the start position, to a high level, wherein a length of the predetermined number of symbols is equal to a length of the predetermined spreading sequence.
9. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of generating a wireless-light oriented communication awareness integrated waveform of any of claims 1-4.
10. A computer-readable storage medium having stored thereon a computer program, wherein the program is executed by a processor for implementing the method of generating a wireless-optical-oriented communication awareness integration waveform of any one of claims 1-4.
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