CN109412995A - The quasi- permanent envelope multicarrier transmitting method of multithread based on variable sub carriers bandwidth - Google Patents
The quasi- permanent envelope multicarrier transmitting method of multithread based on variable sub carriers bandwidth Download PDFInfo
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- 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
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- 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
- H04L27/2614—Peak power aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
The present invention proposes a kind of quasi- permanent envelope multicarrier transmitting method of the multithread based on variable sub carriers bandwidth, belongs to wireless communication technology field.The present invention is respectively N, N for the time-domain signal length that transmitting terminal is sent1,…,NP‑1P data flow, wherein meeting N > N1+N2+…+NP‑1, each data stream bits are mapped to form symbol data streams through symbol, symbol data streams are mapped on different subcarriers, and time-domain signal length is that the data flow 1 of N forms permanent envelope ofdm signal after phase-modulationThe time-domain signal of data flow 2,3 ..., P is time-multiplexed and adds protection interval to N length, and formation length is the composite time-domain signal of NIt is rightPhase-modulation forms permanent envelope ofdm signalBy signalWithIt carries out transposition merging and obtains the quasi- constant envelope signal of final multithread.The present invention devises a kind of permanent envelope waveform of the standard with hybrid waveform parameter, supports multiple business data flows with different sub-carrier bandwidth and signal duration, improves the transmission quality and spectrum efficiency of satellite mobile communication system.
Description
Technical field
The invention belongs to wireless communication technology field, be related to it is a kind of applied to satellite mobile communication system based on can varitron
The quasi- permanent envelope Multicarrier Transmission Technology of the multithread of carrier bandwidths.
Background technique
In wireless communication scene, information is transferred to receiver using electromagnetic wave as carrier, from transmitter by wireless channel
Realize communication.Communication quality is easy to be influenced to cause to receive signal generation amplitude and phase by the channels factor such as noise, interference
Variation, influences communication quality.Multicarrier Transmission Technology modulates the signal on multiple subcarriers, forms multiple relatively flats
Subchannel.Key technology one of of orthogonal frequency division multiplexing (OFDM) technology as ground forth generation and the 5th third-generation mobile communication be
A kind of typical multi-transceiver technology.Multiple subcarriers of ofdm signal are mutually orthogonal, have been obviously improved spectrum efficiency.But
High peak-to-average power ratio (PAPR) characteristic of OFDM makes it be difficult to directly apply in the satellite mobile communication system of power limited, therefore
The multi-transceiver technology of low PAPR is needed, such as permanent envelope OFDM (CE-OFDM) technology.CE-OFDM technology uses the side of phase-modulation
PAPR can be controlled in 0dB so that CE-OFDM signal has constant envelope, improve the efficiency of satellite power amplifier by formula.But
CE-OFDM signal is needed by the way that transmitting terminal frequency-region signal is built into center conjugate symmetric data, and spectrum efficiency is reduced to OFDM
The 50% of signal, in order to improve spectrum efficiency, it is contemplated that construct the multi-carrier mode of multiple data stream.In addition, satellite communication system
Wide coverage, the large scale frequency deviation of user's various degrees of different zones, and frequency deviation is to the performance of multicarrier system
The size for depending on normalizing frequency deviation is influenced, therefore, designing fixed subcarrier bandwidth can not be perfectly suitable for having big model
Enclose the satellite communication system of frequency deviation difference, it is contemplated that using variable subcarrier bandwidth design；On the other hand, due to constantly increasing
Terrestrial user number of nodes and abundant, diversified business demand, select bigger subcarrier bandwidth that can mention for high speed business
For higher transmission rate.
At present in satellite mobile communication system, the CE-OFDM multi-carrier signal of single data stream has constant envelope, can have
Effect reduces PAPR, but spectrum efficiency is reduced to original half.In addition, the multicarrier of single waveform parameter does not adapt to satellite shifting
A wide range of channel parameter variation in dynamic communication system, such as large scale frequency deviation.
Summary of the invention
Single waveform parameter is used for existing satellite communication Multicarrier Transmission Technology, does not adapt to satellite mobile communication system
The problem of variation of large scale frequency deviation is with business transmission demand in system, the present invention provides a kind of based on the more of variable sub carriers bandwidth
The quasi- permanent envelope multicarrier transmitting method of stream, devises a kind of novel multi-carrier transmission signal structure, passes through the son of flexibility and changeability
Carrier bandwidths design and multiple data stream transmission structure provide more flexible channel adaptation ability and spectrum utilization effect for system
Rate.
The quasi- permanent envelope multicarrier transmitting method of multithread based on variable sub carriers bandwidth of the invention,
It is located at transmission transmitting terminal and sends P data flow, the time-domain signal length of P data flow is respectively N, N1,…,NP-1,
And meet N > N1+N2+…+NP-1；Each data stream bits are mapped to form symbol data streams by the method for the present invention through symbol first,
Secondly symbol data streams are mapped on different subcarriers；P is positive integer；
The data flow 1 that time-domain signal length is N is passed through into phase-modulation, the permanent envelope ofdm signal at the n moment of formation isN=0,1 ..., N-1；N is positive integer；
N=0 ..., N-1；Wherein, A1For amplitude, 2 π h1For modulation index；
The time-domain signal of data flow 2,3 ..., P is time-multiplexed and adds protection interval to N length, formation length
For the composite time-domain signal of NThen composite time-domain signalThe permanent envelope ofdm signal at n moment is formed by phase-modulation
N=0 ..., N-1；Wherein, A2For amplitude, 2 π h2For modulation index；
By signalWithCarry out the quasi- constant envelope signal of multithread that transposition merges n at the time of obtaining final
Advantages of the present invention can be provided based on channel conditions and traffic need with the method for the present invention is had the active effect that for system
The ability for asking dynamic to adjust, improves the transmission quality and spectrum efficiency of satellite mobile communication system.The method of the present invention passes through more
The mode of data flow time-frequency superposition constructs the multi-carrier signal of quasi- permanent envelope.The present invention is mentioned in the case where ensure that low PAPR
It has supplied a kind of spectrum efficiency high and the signal for being suitable for satellite diversification business transmission demand and the variation of large scale frequency deviation passes
Defeated system, so that quasi- perseverance envelope OFDM has the feasibility of application in real satellite scene.
Detailed description of the invention
Fig. 1 is the quasi- permanent envelope multi-carrier transmission transmitting terminal flow diagram of multithread of the invention；
Fig. 2 is the schematic diagram that multithread of the invention was time-multiplexed and added protection interval；
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
In existing satellite mobile communication system, consideration is single business, single subcarrier bandwidth, the data for fixing duration
In the prior art not transmission is not applied for the variation of large scale frequency deviation and business transmission demand in satellite mobile communication system, i.e.,
Consider that single waveform carrying has asking for multiple data flows of hybrid waveform parameter (a variety of subcarrier bandwidths, multi-signal duration)
Topic.The method of the present invention devises a kind of permanent envelope waveform of the standard with hybrid waveform parameter, can support multiple with different sub- loads
The wide business data flow with signal duration of wavestrip.The multiplicity different to subcarrier bandwidth present in practical communication, signal duration
Change business can be transmitted according to the length of specific data stream using the multiplexed form of the method for the present invention design.The present invention
Method is suitable for the satellite communication system of power limited.
The quasi- permanent envelope multicarrier transmitting method of multithread based on variable sub carriers bandwidth of the invention, is supporting diversified industry
While business data stream transmitting, waveform has the characteristic of quasi- permanent envelope.In order to improve spectrum utilization efficiency, the present invention is designed more
The quasi- permanent envelope transmission structure of stream is as shown in Figure 1.
As shown in Figure 1, first P data stream bits to be sent are mapped to form multiple symbol data streams by symbol；
Secondly, each symbol data streams are mapped on different subcarriers；If the time-domain signal length of P data flow is respectively N,
N1,…,NP-1, and meet N > N1+N2+…+NP-1.P is positive integer, and for the method for the present invention, P is greater than or equal to 2.To data
Stream 1 carries out N point IDFT (inverse discrete Fourier transform), and to data flow 2,3 ..., P carries out N respectively1,N2,…,NP-1The IDFT of point,
The subcarrier bandwidth of different data streams is respectively Δ f1,Δf2,…,ΔfP.Finally, different data streams pass through transposition overlaying structure
Realize the multiplexing of multiple data stream.
The subcarrier bandwidth of data flow p is Δ f in P data flowp, the time domain OFDM signal of n time data stream p can be with table
It is shown asIt is as follows:
Wherein, n=0,1 ..., N-1, N are the points of inverse discrete Fourier transform.Moment 0 indicates initial time.
Be data flow p frequency domain conjugation is symmetrical, zero-filled data vector, be represented by
Wherein,For normalized M-QAM data symbol, M-QAM data symbol is M system QAM (quadrature amplitude
Modulation) symbol,It is 1 row NzpThe null vector of column, N=Ns+Nzp+ 2, oversample factor J=N/ (2Ns+2)。NsRepresent M-QAM
The quantity of data symbol.NzpFor the length of null vector, change Nzp, adjustable oversample factor.For vector XmConjugation to
Amount.
Due to such structure, ofdm signal is at real value sequence, to construct permanent envelope OFDM (CE-OFDM) signal such as
Following formula:
Wherein, ApFor the amplitude of data flow p, 2 π hpIt is the modulation index of data flow p, n=0,1 ..., N-1.Such overloading
Wave only influences the phase of signal, and PAPR can be effectively reduced.But from formula (2) as can be seen that the feelings transmitted for single data stream
Shape, due to the case where there is conjugation symmetrical structure and intermediate zero padding, spectrum efficiency is lower than the 50% of traditional ofdm signal.
The data flow 1 that time-domain signal length is N can form CE-OFDM signal by phase-modulation, be shown below:
The time-domain signal of so data flow 2,3 ..., P can be time-multiplexed and add protection interval to N length, be formed
Composite time-domain signal is as shown in Figure 2.In Fig. 2, data flow 2,3 ..., the time domain length of P is respectively N1,N2,…,NP-1, specific number
It can further be write as according to the time-domain symbol of stream pP=2,3 ..., P；Between protection in figure between 0 expression data flow
Every, be collectively formed length be N time-domain signalN=0,1 ..., N-1.
The multiplexed data flow that length after multiple data stream time division multiplexing is N is represented byN=1,2 ..., N.Multiplexing number
It can be formed by phase-modulation shown in CE-OFDM signal such as formula (5) according to stream, 2 π h in formula2Indicate that the modulation of multiplexed data flow refers to
Number, A2Indicate the amplitude of multiplexed data flow.
Further, as shown in Figure 1, the signal that multiple data stream merges final output through transposition can be by shown in formula (6).
In transposition overlaying structure in Fig. 1, the N point time-domain symbol of data flow 1 is the CE- of N by formula (4) formation length
Ofdm signal, data flow 2,3 ..., P are formd the time domain that length is N in a time multiplexed manner and are accorded with by addition protection interval
Number, and another way CE-OFDM signal is further formed by the phase-modulation of formula (5), and by multiplied byAnd and data flow
1 linearly is added, and forms the quasi- constant envelope signal of final multithread.
In dotted line frame above Fig. 1 by taking three data flows as an example, the effect of time-frequency superposition is described.When laterally being indicated in figure
Between, vertically indicate frequency, when lower part symbol a length of T1, subcarrier bandwidth Δ f1Data flow and upper left-hand symbol when it is a length of
T2, subcarrier bandwidth Δ f2Data flow and upper right symbol when a length of T3, subcarrier bandwidth Δ f3Data flow realize
Time-frequency superposition, improves the utilization efficiency of frequency spectrum, protection of the intermediate gaps part of top two data streams between subcarrier
Interval.
Obviously, described embodiment is also only a part of the embodiments of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Claims (2)
1. a kind of quasi- permanent envelope multicarrier transmitting method of the multithread based on variable sub carriers bandwidth, which is characterized in that be located at transmission
Transmitting terminal sends P data flow, and the time-domain signal length of P data flow is respectively N, N1,…,NP-1, and meet condition: N >
N1+N2+…+NP-1；The described method includes: firstly, each data stream bits map to form symbol data streams through symbol, secondly, will symbol
Number stream is mapped on different subcarriers；
The data flow 1 that time-domain signal length is N is passed through into phase-modulation, the permanent envelope ofdm signal at the n moment of formation isn
=0,1 ..., N-1；P, N is positive integer；
The time-domain signal of data flow 2,3 ..., P is time-multiplexed and adds protection interval to N length, formation length is N's
Composite time-domain signalThen composite time-domain signalIt is by the permanent envelope ofdm signal at n moment that phase-modulation is formed N=0 ..., N-1；Wherein, A2For amplitude, 2 π h2For modulation index；
By signalWithIt carries out transposition merging and obtains the quasi- constant envelope signal of multithread at final n moment
2. wherein data flow p is at the n moment the method according to claim 1, wherein the P data flow
Time domain OFDM signal is expressed asN=0,1 ..., N-1；
Wherein,Be data flow p frequency domain conjugation is symmetrical, zero-filled data vector, be expressed as:
Wherein,For normalized M-QAM data symbol,For vector XmConjugate vector, NsRepresent M-QAM data symbols
Number quantity；It is 1 row NzpThe null vector of column；N=Ns+Nzp+ 2, oversample factor J=N/ (2Ns+2)；
The permanent envelope ofdm signal at the n moment then formed by phase-modulationN=0,1 ..., N-1, p=1,
2,…,P；
Wherein, ApFor the amplitude of data flow p, 2 π hpIt is the modulation index of data flow p.
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| CN110266623A (en) * | 2019-06-05 | 2019-09-20 | 北京邮电大学 | A kind of LEO satellite communication systems carrier synchronization method based on 5G |
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