CN105978672A - Wireless ad hoc network based physical layer frame structure and configuration method thereof - Google Patents
Wireless ad hoc network based physical layer frame structure and configuration method thereof Download PDFInfo
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- CN105978672A CN105978672A CN201610235715.4A CN201610235715A CN105978672A CN 105978672 A CN105978672 A CN 105978672A CN 201610235715 A CN201610235715 A CN 201610235715A CN 105978672 A CN105978672 A CN 105978672A
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- ofdm
- ofdm symbol
- time slot
- physical layer
- frame structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0008—Wavelet-division
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2676—Blind, i.e. without using known symbols
- H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a configuration method for a physical layer frame structure based on an OFDM (Orthogonal Frequency Division Multiplexing) technology in a wireless ad hoc network. A frame formed by a preamble, a frame control head, a valid data segment and time-delay protection data which are mutually independent is generated, wherein the preamble comprises one or two OFDM symbols, the frame control head comprises one OFDM symbol, the valid data segment comprises an integer number of OFDM symbols and is composed of one or more bursts, and the time-delay protection data does not contain OFDM signals. The design of the frame structure can effectively relieve influences imposed on an OFDM communication system by noises, and improves the utilization rate of OFDM bandwidth at the same time, thereby improving the quality of wireless communication.
Description
Technical field
The present invention relates to wireless communication field, specifically a kind of in wireless self-organization network based on orthogonal frequency division multiplexi
(OFDM) physical layer frame structure.
Background technology
Traditional wireless cellular communication network, needs the fixing network equipment and base station to support, can carry out data forwarding and
The Service controll of user.And wireless self-organization network MANET (Mobile Ad Hoc Network), it is not necessary to fixing equipment props up
Holding, each node i.e. user terminal can networking voluntarily.During communication, the centre that other user node can forward as data
Node.This network organization form weakens the geographic limitations of conventional wireless network in certain degree, and it is the most easily
Characteristic is applicable to the communication needs of some urgent occasions, occupies critically important position in military communication.But, wireless Ad Hoc
It is limited that network there is also the network bandwidth, the most high drawback of safety.
In order to reduce the impact for communication of drawback in wireless self-organization network, orthogonal frequency division multiplexi OFDM (Orthogonal
Frequency Division Multiplexing), it is widely used.Channel is divided by orthogonal frequency division multiplexi exactly
Becoming some orthogonal sub-channels, high-speed data signal is converted into parallel low speed sub data flow, modulation is to entering on each of the sub-channels
Row transmission.Orthogonal signalling can be by using correlation technique to come separately at receiving terminal, and that so can reduce between subchannel is mutual
Interference ICI.Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, and therefore every sub-channels can regard flatness as
Decline, such that it is able to eliminate intersymbol interference.And owing to the bandwidth of every sub-channels is only the sub-fraction of former channel width,
Channel equalization becomes relatively easy.
OFDM technology can send substantial amounts of data under narrow band bandwidth, and this transmits for the finite bandwidth in wireless self-organization network
It is very helpful.Meanwhile, this technology can automatically detect which specific carrier wave under transmission medium and there is high signal
Decay or disturbing pulse, then take suitably to modulate measure to make the carrier wave under assigned frequency carry out success communication, and this can be very
The problem of channel disturbance in good solution radio communication.But, despite many advantages, OFDM technology there is also certain
Defect.Whole ofdm system is especially strict to the orthogonality requirement between each subcarrier, and the little carrier wave frequency deviation in any point all can
Destroy the orthogonality between subcarrier, cause ICI.So, ofdm system is the most sensitive for phase noise and carrier wave frequency deviation.
It addition, ofdm signal is made up of multiple sub-carrier signals, these sub-carrier signals are independently modulated by different modulation symbols.Simultaneous interpretation
The modulator approach of the permanent envelope of system is compared, and OFDM modulation exists a peak factor the highest.Because ofdm signal is a lot of
The summation of small-signal, the phase place of these small-signals is to be determined by data sequence to be transmitted.To some data, these small-signals
Possible homophase, and be superimposed in amplitude thus produce the biggest instantaneous peak value amplitude.And peak-to-average force ratio is excessive, it will increase
The complexity of A/D and D/A, and the efficiency of radio-frequency power amplifier can be reduced.Meanwhile, in transmitting terminal, the maximum of amplifier
Output limits the peak value of signal, and this can produce interference in OFDM frequency range and between successive bands.
In the communications, frame is that length is fixed or variable packet, and it encodes according to the communication protocol of Digital Transmission.Frame structure limits
Determine multiplexer and communication channel has been divided the framing mode for transmission.The performance of system is had mainly by the frame structure of ofdm system
Impact.At present, the selection to high-performance OFDM and OFDM frame structure is limited.Accordingly, it would be desirable to provide for high-performance OFDM system
A kind of new frame structure design makes up the defect that OFDM technology is existing when being applied to radio communication.
Summary of the invention
For the deficiency of the defect that OFDM in above-mentioned prior art exists in wireless communications, the purpose of the present invention is to propose to one
Frame structure based on wireless self-organization network physical layer and collocation method thereof, can alleviate what system was communicated by phase noise effectively
Impact, can effectively utilize OFDM bandwidth simultaneously, improves the quality of radio communication.
Physical layer frame structure collocation method based on OFDM technology in a kind of wireless self-organization network, its feature is, generates by phase
The most independent preamble word, frame control head, valid data section and the frame of delay protection data composition；
Described preamble word includes 1 or 2 OFDM symbol, and described frame control head includes 1 OFDM symbol, described
Valid data section includes integer OFDM symbol, is made up of one or more bursts, and described delay protection data do not comprise OFDM
Signal.
Time slot kind is divided into node to find section, basic communication time slot and service communication time slot；
Described node finds that section includes 1ms time slot and 2ms time slot, and described basic communication time slot is 1ms time slot, described
Service communication time slot includes 2ms and 4ms time slot.
Described preamble word includes long preambles and short leading two kinds；
Described long preambles is made up of two OFDM symbol: the subcarrier of the multiple of first OFDM symbol use numbered four,
Waveform in time domain is 4 burst that sample value is 512 compositions repeated, and the front portion of burst is with Cyclic Prefix；Second
OFDM symbol uses even number subcarrier, and its spatial structure is made up of 2 bursts that sample value is 1024 repeated, and with
One Cyclic Prefix；
Described short leading taking 1 OFDM symbol, its spatial structure is made up of 2 bursts that sample value is 1024 repeated,
And with a Cyclic Prefix.
An a length of OFDM symbol of described frame control head, uses BPSK modulation system and the coding of 1/2 speed；Frame control
Head processed includes the concrete modulation intelligence of whole Frame, and wherein 3bit represents that modulation system, 2bit represent code length, code check
Accounting for 2bit length, the OFDM symbol number in burst accounts for 10bit length, and head verification sequence accounts for 8bit length.
Described valid data section is made up of integer OFDM symbol, and each symbol time is 90 μ s, selects the number of burst
Determined by the channel properties of MAC layer.A length of the 10 of Cyclic Prefix, a length of the 80 of data.
Compared with prior art, the invention has the beneficial effects as follows: the design of this frame structure can effectively alleviate phase noise for
The impact of ofdm communication system, improves the utilization rate of OFDM bandwidth simultaneously, thus improves the quality of radio communication.
Accompanying drawing explanation
Fig. 1 is present invention frame structure based on wireless self-organization network physical layer schematic diagram；
Fig. 2 is the spatial structure of long preambles；
Fig. 3 is short leading spatial structure；
Fig. 4 is physical layer frame data division structure.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings.
One. wireless self-organization network physical layer
Frame structure designed by the present invention, mainly in wireless self-organization network based on OFDM technology.So wireless Ad Hoc
The physical layer parameter of network is particularly important for the design of frame structure.Designed frame structure is aimed at wireless self-organization network
The basic parameter of physical layer designs, and may be advantageously employed in the transmission of physical layer data information.
Two. physical layer frame structure
Fig. 2 is present invention frame structure based on wireless self-organization network physical layer schematic diagram, with reference to the design of MAC part, permissible
Design parameter according to MAC layer designs several frame structures after physical layer adaptation MAC.
The frame structure of physical layer is mainly made up of four parts, is respectively as follows: preamble word, frame control head, valid data section and time delay and protects
Protect data.
1. preamble word
Preamble word is divided into two kinds of long preambles and short leading.
Long preambles structure is as in figure 2 it is shown, be made up of two OFDM symbol.First OFDM symbol only uses numbered 4
The subcarrier of multiple, the waveform in time domain is 4 bursts that sample value is 512 compositions repeated, the front portion of burst with
Cyclic Prefix (CP)；Second OFDM symbol only uses even number subcarrier, and its spatial structure is by 2 sample values repeated
It is the burst composition of 1024, and with a Cyclic Prefix.
Short preamble structure is as shown in Figure 3.Short leading taking 1 OFDM symbol, its spatial structure is by 2 sample values repeated
It is the burst composition of 1024, and with a Cyclic Prefix.
2. frame control head
An a length of OFDM symbol of frame control head (FCH) part.Use BPSK modulation system and the volume of 1/2 speed
Code.The information comprised in FCH is as shown in table 1:
Table 1 frame controls the specifying information of (FCH)
| Parameter name | Size (bit) |
| Modulation system | 3 |
| Code length | 2 |
| Code check | 2 |
| OFDM symbol number in burst | 10 |
| Head verification sequence | 8 |
As can be seen from Table 1, the rate domain that the information field subband of this frame structure is filled is made up of 7 bits, can according to this 7
The information of individual bit, determines the modulation system of the data field that this rate domain place subband comprises and code length and code rate.Work as tune
Mode processed is 001, and when code check is 01, the modulation system of corresponding data field is BPSK, and code rate is 1/2, is equivalent to
Number of coded bits in every every OFDM symbol of subcarrier is 1 bit, the data that the every OFDM symbol of every subcarrier can be transmitted
Bit number is 1/2 bit；When modulation system is 001, and code check is 11, the modulation system of corresponding data field is BPSK,
Code rate is 3/4, and being equivalent to the number of coded bits in the every OFDM symbol of every subcarrier is 1 bit, the every OFDM of every subcarrier
The data bit number that symbol can transmit is 3/4 bit；When modulation system is 010, and code check is 01, corresponding data field
Modulation system be QPSK, code rate is 1/2, and being equivalent to the number of coded bits in the every OFDM symbol of every subcarrier is 2
Bit, the data bit number that the every OFDM symbol of every subcarrier can be transmitted is 1 bit；When modulation system is 100, and code check is
When 10, the modulation system of corresponding data field is 64QAM, and code rate is 2/3, is equivalent to the every OFDM of every subcarrier
Number of coded bits on symbol is 6 bits, and the data bit number that the every OFDM symbol of every subcarrier can be transmitted is 4 bits.
3. valid data section
As shown in Figure 4, valid data section is made up of the frame structure of valid data section integer OFDM symbol, each symbol time
It is 90 μ s, selects the number of burst to be determined by the channel properties of MAC layer.A length of the 10 of CP, a length of the 80 of data.
Three. physical layer transmission process
Frame specifically includes that scrambler, multistage code rate coding in the whole process of physical layer transmission and interweaves, modulates mapping, PN
Sequencer, framing, up-sampling and shaping filter etc..
1. chnnel coding and modulation
This encoding scheme is the encoding scheme of LDPC at present.Include the coding of 3 length.
LDPC coding concrete codeword structure be information bit front, check bit is rear.Long with 1536, the code word of 1/2 code check is
Example.
2. interweave
Interweave and mainly complete two work: the mapping between different LDPC modules；High-order maps the intertexture of difference protection bits.
3. map
Mapping mode uses BPSK, QPSK (4QAM), 16QAM and 64QAM planisphere.
4. insert pilot tone
The frequency number equally spaced insertion pilot tone of the pilot sub-carrier according to wireless self-organization network physical layer.It should be noted that
The protection subcarrier on both sides and the value of DC carrier wave are all 0.OFDM modulates
The modulated process of OFDM: first data are through serioparallel exchange, then by IFFT, is exported by parallel-serial conversion the most again.
5. add CP
It is that OFDM time domain is launched the process that signal adds CP after inserting pilot tone.One major reason of application OFDM is
It can be effective against multi-path delay spread.In addition to method except being transmitted by data parallel eliminates intersymbol interference, also need
To insert Time Guard Interval between two continuous print OFDM symbol, general employing Cyclic Prefix realizes.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted, although with reference to preferably
The present invention has been described in detail by embodiment, it will be understood by those within the art that, can be to the technical scheme of invention
Modifying or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should contain the power in the present invention
In the middle of profit claimed range.
Claims (5)
1. physical layer frame structure collocation method based on OFDM technology in a wireless self-organization network, it is characterised in that generate
The frame being made up of separate preamble word, frame control head, valid data section and delay protection data；
Described preamble word includes 1 or 2 OFDM symbol, and described frame control head includes 1 OFDM symbol, described
Valid data section includes integer OFDM symbol, is made up of one or more bursts, and described delay protection data do not comprise OFDM
Signal.
Physical layer frame structure collocation method the most according to claim 1, it is characterised in that time slot kind is divided into node to send out
Existing section, basic communication time slot and service communication time slot；
Described node finds that section includes 1ms time slot and 2ms time slot, and described basic communication time slot is 1ms time slot, described
Service communication time slot includes 2ms and 4ms time slot.
Physical layer frame structure collocation method the most according to claim 1, it is characterised in that described preamble word includes long
Leading and short leading two kinds；
Described long preambles is made up of two OFDM symbol: the subcarrier of the multiple of first OFDM symbol use numbered four,
Waveform in time domain is 4 burst that sample value is 512 compositions repeated, and the front portion of burst is with Cyclic Prefix；Second
OFDM symbol uses even number subcarrier, and its spatial structure is made up of 2 bursts that sample value is 1024 repeated, and with
One Cyclic Prefix；
Described short leading taking 1 OFDM symbol, its spatial structure is made up of 2 bursts that sample value is 1024 repeated,
And with a Cyclic Prefix.
Physical layer frame structure collocation method the most according to claim 1, it is characterised in that the length of described frame control head
Degree is an OFDM symbol, uses BPSK modulation system and the coding of 1/2 speed；Frame control head includes whole Frame
Concrete modulation intelligence, wherein 3bit represents that modulation system, 2bit represent that code length, code check account for 2bit length, the OFDM in burst
Symbol numbers accounts for 10bit length, and head verification sequence accounts for 8bit length.
Physical layer frame structure collocation method the most according to claim 1, it is characterised in that described valid data section by
Integer OFDM symbol forms, and each symbol time is 90 μ s, selects the number of burst to be determined by the channel properties of MAC layer.
A length of the 10 of Cyclic Prefix, a length of the 80 of data.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107135470A (en) * | 2017-05-11 | 2017-09-05 | 小唐科技（上海）有限公司 | A kind of frame structure and its communication means of wireless self-networking physical layer |
| CN110944022A (en) * | 2019-12-31 | 2020-03-31 | 重庆源联信息科技有限公司 | Frame structure applied to Chirp modulation mode in Internet of things system |
| CN111770516A (en) * | 2020-07-08 | 2020-10-13 | 清华大学 | Frame structure design and use method for ad hoc network communication |
| CN114449053A (en) * | 2022-03-03 | 2022-05-06 | 重庆邮电大学 | Internet of things frame structure design method adopting Chirp modulation |
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| CN107135470A (en) * | 2017-05-11 | 2017-09-05 | 小唐科技（上海）有限公司 | A kind of frame structure and its communication means of wireless self-networking physical layer |
| CN110944022A (en) * | 2019-12-31 | 2020-03-31 | 重庆源联信息科技有限公司 | Frame structure applied to Chirp modulation mode in Internet of things system |
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Application publication date: 20160928 |