CN107370707A - A kind of signal processing method and device - Google Patents
A kind of signal processing method and device Download PDFInfo
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- CN107370707A CN107370707A CN201610318943.8A CN201610318943A CN107370707A CN 107370707 A CN107370707 A CN 107370707A CN 201610318943 A CN201610318943 A CN 201610318943A CN 107370707 A CN107370707 A CN 107370707A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—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
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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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Abstract
The present invention provides a kind of signal processing method, including：QAM modulation is carried out to bit block, exports N/2 qam symbol, the bit block includes multiple bits；Conjugation processing is done to the N/2 qam symbol, exports N/2 conjugate of symbol；The N/2 qam symbol is sequentially mapped on the 1st to the N/2 subcarrier, the N/2 conjugate of symbol is sequentially mapped to N/2+1 to n-th subcarrier according to the mapping order opposite with the N/2 qam symbol；Wherein N is the number of subcarrier；Because 2 subcarriers that qam symbol and conjugate of symbol take have symmetric relation, under the conditions of I/Q is unbalanced, the reliability of the transmission of wireless signal is improved.
Description
Technical field
The present invention relates to wireless communication field, more particularly, to a kind of signal processing method and device.
Background technology
OFDM(OFDM:Orthogonal Frequency Division Multiplex, OFDM) it is wireless
Communication system is widely used multiplexing technology, in LTE (Long Term Evolution, Long Term Evolution) communication system
Used with the systems of IEEE 802.11, OFDM waveforms are also one of candidate's waveform of 5G GSMs.Modulation technique is handle
Binary baseband signal is transformed into the process for the data signal that can be transmitted, and widely used modulation technique is QAM in ofdm system
(Quadrature Amplitude Modulation, quadrature amplitude modulation), such as 4 rank QAM, 16 rank QAM, 64 rank QAM etc., its
In 4 rank QAM be exactly QPSK (quadrature phase shift keying, QPSK) modulation.
Signal after modulation forms baseband signal after OFDM is handled, and baseband signal is expressed as I roads and what Q roads were formed answers
Number, radio frequency unit in then inputting, I/Q imbalances are the phenomenons of radio frequency unit generally existing in wireless communication system.Middle radio frequency
Unit respectively will amplify baseband signal to I roads and Q roads, and be modulated to carrier frequency fcOn.In high frequency (fc>6GHz) communication system
In system, due to carrier frequency point is high, with roomy, cause middle radio frequency unit can not precise calibration I/Q two-way parameter.Therefore, I/Q is not
Equilibrium appearance is with carrier frequency fcRise can be increasingly severe, I/Q is uneven to reach the distortion that can cause signal to a certain degree, production
Raw interference, causes radio transmission performance to decline.
In high frequency communication system, how in the case of I/Q is unbalanced, ensure that ofdm modulation signal can under wireless channel
It is current difficult point by transmission.
The content of the invention
The present invention provides a kind of signal processing method and device, and reliability is wirelessly transferred with improve signal.
On the one hand, the present invention provides a kind of signal processing method, including：
QAM modulation is carried out to bit block, exports N/2 qam symbol, the bit block includes multiple bits；To the N/2
Individual qam symbol does conjugation processing, exports N/2 conjugate of symbol；The N/2 qam symbol is sequentially mapped to the 1st to N/2
On individual subcarrier, the N/2 conjugate of symbol is sequentially mapped to according to the mapping order opposite with the N/2 qam symbol
N/2+1 is on n-th subcarrier；Wherein N is the number of subcarrier.
With reference to above-mentioned aspect, in one embodiment, the QAM modulation is Q ranks, Q=22q, q is natural number；Being easy to will
This method expands to general QAM modulation.
With reference to above-mentioned each side, wherein, N is 2 integral multiple, i.e. N/2 is positive integer.
In addition, as another embodiment, qam symbol can be multiple, such as larger than or less than N/2；Such as：If QAM
Symbolic number is less than N/2, then conjugate of symbol is again smaller than N/2, and some subcarriers are sky after mapping.Usual qam symbol number is less than or equal to
N/2。
With reference to above-mentioned various aspects, further comprise before this method：Binary bits information flow is divided into bit block；Its
Middle bit block is usually multiple, and above-mentioned each scheme illustrates by taking a bit block as an example；In practical application, if multiple ratios
Special block, each bit block are performed both by aforesaid operations.
With reference to above-mentioned various aspects, this method further comprises：OFDM processing, output are carried out to N number of symbol after mapping
Include the baseband signal of I/Q two-way.
With reference to above-mentioned various aspects, the N/2 qam symbol is (d1,d2,…,dN/2), N/2 conjugate of symbol is
(dP(1),dP(2),…,dP(N/2)), then specific mapping process can be：
By symbol dkIt is mapped to k-th of subcarrier；
By symbol dP(k)It is mapped to the individual subcarriers of P (k), P (k)=N-k+1；
Wherein k=1,2 ..., N/2.
For example, it is assumed that there are 8 subcarriers, according to above-mentioned mapping method, d1It is mapped to the 1st subcarrier, d2It is mapped to the 2nd
Individual subcarrier, d3It is mapped to the 3rd subcarrier, d4It is mapped to the 4th subcarrier, dP(1)It is mapped to the 8th subcarrier, dP(2)Reflect
It is mapped to the 7th subcarrier, dP(3)It is mapped to the 6th subcarrier, dP(4)It is mapped to the 5th subcarrier.
In previous example, if only 3 qam symbol (d1, d2, d3) and conjugate of symbol (dP(1), dP(2), dP(3)), then
4,5 subcarriers are sky.
On the other hand, the present invention also provides a kind of signal processing method, including：
QAM modulation is carried out to bit block, exports multiple qam symbols, the bit block includes multiple bits；To the multiple
Qam symbol does conjugation processing, exports multiple conjugates of symbol；The multiple qam symbol and the multiple conjugate of symbol are entered respectively
Row spread processing, export the qam symbol after N/2 spread spectrum and the conjugate of symbol after N/2 spread spectrum；After described N/2 spread spectrum
Qam symbol be sequentially mapped on the 1st to the N/2 subcarrier, by described N/2 spread spectrum after conjugate of symbol according to it is described
The opposite mapping order of qam symbol after N/2 spread spectrum is sequentially mapped to N/2+1 to n-th subcarrier；Wherein N is son
The number of carrier wave.
Wherein, N is 2 integral multiple, i.e. N/2 is positive integer.
In addition, as one embodiment, the qam symbol after spread spectrum can be multiple, such as larger than or less than N/2, such as：Such as
Qam symbol number after fruit spread spectrum is less than N/2, then and conjugate of symbol number is again smaller than N/2, and some subcarriers are sky after mapping.
With reference to above-mentioned aspect, in one embodiment, the qam symbol is that N/ (2M) is individual, and the conjugate of symbol is N/
(2M) is individual；N/ (2M) is positive integer.
The spread processing is M times of spread processing, M=2n, n is natural number.
The program is applicable the signal processing method that more general QAM is combined with OFDM technology, and it is big to be applicable spreading factor
In 2 situation.
With reference to above-mentioned each side, the QAM modulation is Q ranks, Q=22q, q is natural number.
With reference to above-mentioned various aspects, further comprise before this method：Binary bits information flow is divided into bit block；Its
Middle bit block is usually multiple, and such scheme illustrates by taking a bit block as an example；In practical application, if multiple bits
Block, each bit block are performed both by aforesaid operations.
With reference to above-mentioned various aspects, this method further comprises：OFDM processing, output are carried out to N number of symbol after mapping
Include the baseband signal of I/Q two-way.
With reference to above-mentioned various aspects, N/2 qam symbol after the spread spectrum is (d '1,d’2,…,d’N/2), after spread spectrum
N/2 conjugate of symbol is (d 'P(1),d’P(1)+1,…,d’P(1)+M-1,…,d’P(N/2M),d’P(N/2M)+1,…,d’P(N/2M)+M-1；), then
Specifically mapping process can be：
By symbol d 'kIt is mapped to k-th of subcarrier, wherein k=1,2 ..., N/2；
By symbol d 'P(k)+mIt is mapped to P (k)+m subcarriers, wherein k=1,2 ..., N/2M；M=0,1 ... M-1；P
(k)=N-Mk+1；Mk implication is M × k.
For example, it is assumed that there are 8 subcarriers, according to above-mentioned mapping method, d1It is mapped to the 1st subcarrier, d2It is mapped to the 2nd
Individual subcarrier, d3It is mapped to the 3rd subcarrier, d4It is mapped to the 4th subcarrier, dP(1)It is mapped to the 8th subcarrier, dP(2)Reflect
It is mapped to the 7th subcarrier, dP(3)It is mapped to the 6th subcarrier, dP(4)It is mapped to the 5th subcarrier.
In previous example, if only 3 qam symbol (d1, d2, d3) and conjugate of symbol (dP(1), dP (2),dP(3)), then
4,5 subcarriers are sky.
Above-mentioned each method can be performed by the network equipment, can also be performed by terminal.
On the other hand, the present invention also provides a kind of signal processing apparatus, including：
Modulation module, for carrying out QAM modulation to bit block, N/2 qam symbol is exported, the bit block includes multiple
Bit；Conjugate module, for doing conjugation processing to the N/2 qam symbol, export N/2 conjugate of symbol；Mapping block, use
Be sequentially mapped in by the N/2 qam symbol on the 1st to the N/2 subcarrier, by the N/2 conjugate of symbol according to
The opposite mapping order of the N/2 qam symbol is sequentially mapped to N/2+1 to n-th subcarrier；Wherein N is subcarrier
Number.
With reference to above-mentioned aspect, wherein the QAM modulation is Q ranks, Q=22q, q is natural number.
With reference to above-mentioned aspect, the device can also include segmentation module, for binary bits information flow to be divided into bit
Block, the bit block is inputted into modulation module；The bit block of generation is usually multiple.
The device can further include OFDM modules, enter for N number of symbol after the mapping that is exported to mapping block
Row OFDM processing, output include the baseband signal of I/Q two-way.
Another aspect, the present invention also provide a kind of signal processing apparatus, including：
Modulation module, for carrying out QAM modulation to bit block, multiple qam symbols are exported, the bit block includes multiple ratios
It is special；Conjugate module, for doing conjugation processing to the multiple qam symbol, export multiple conjugates of symbol；Spread spectrum module, for pair
The multiple qam symbol and the multiple conjugate of symbol carry out spread processing respectively, output N/2 spread after qam symbol and
Conjugate of symbol after N/2 spread spectrum；Mapping block, arrived for the qam symbol after described N/2 spread spectrum to be sequentially mapped into the 1st
On the N/2 subcarrier, by the conjugate of symbol after described N/2 spread spectrum according to opposite with the qam symbol after described N/2 spread spectrum
Mapping order be sequentially mapped to N/2+1 to n-th subcarrier；Wherein N is the number of subcarrier.
With reference to above-mentioned aspect, the qam symbol is that N/ (2M) is individual, and the conjugate of symbol is that N/ (2M) is individual；At the spread spectrum
Manage as M times of spread processing, M=2n, n is natural number.
With reference to above-mentioned aspect, wherein, the QAM modulation is Q ranks, Q=22q, q is natural number.
With reference to above-mentioned aspect, the device can also include segmentation module, for binary bits information flow to be divided into bit
Block, the bit block is inputted into modulation module；The bit block of generation is usually multiple.
The device can further include OFDM modules, enter for N number of symbol after the mapping that is exported to mapping block
Row OFDM processing, output include the baseband signal of I/Q two-way.
Signal processing method and device provided by the invention, multiple qam symbols after spread processing are reflected successively in order
It is mapped on the 1st to the N/2 subcarrier, multiple conjugates of symbol after spread processing is reflected according to opposite with multiple qam symbols
Penetrate order and be sequentially mapped to N/2+1 to n-th subcarrier, because 2 subcarriers of qam symbol and conjugate of symbol occupancy have
Symmetric relation, under the conditions of I/Q is unbalanced, improve the reliability of transmission of wireless signals.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
The required accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Figure 1A is the system block diagram of SQPSK-OFDM signal processing methods in IEEE802.11ad systems.
Figure 1B is the system block diagram of one embodiment of the invention signal processing method.
Fig. 2 is that qam symbol and conjugate of symbol are mapped to the schematic diagram after subcarrier.
Fig. 3 is the system block diagram of the signal processing method of another embodiment of the present invention.
Fig. 4 is the signal processing apparatus schematic diagram of one embodiment of the invention.
Fig. 5 is the signal processing apparatus schematic diagram of another embodiment of the present invention.
Fig. 6 is the signal processing apparatus schematic diagram of further embodiment of this invention.
Embodiment
The embodiment of the present invention can be used for the various wireless networks based on OFDM technology.Radio Access Network is different
It may include different network elements in system.For example, nothing in LTE (Long Term Evolution) and LTE-A (LTE Advanced)
The network element of line access network includes eNB (eNodeB, evolved base station), and WLAN (wireless local area network)/
Wi-Fi network element includes access point (Access Point, AP) etc..Other wireless networks can also use and the embodiment of the present invention
Similar scheme, simply the correlation module in base station system may be different, and the embodiment of the present invention does not limit.
It should also be understood that in embodiments of the present invention, user equipment (UE, User Equipment) includes but is not limited to move
Platform (MS, Mobile Station), mobile terminal (Mobile Terminal), mobile phone (Mobile Telephone), hand
Machine (handset) and portable equipment (portable equipment) etc., the user equipment can through wireless access network (RAN,
Radio Access Network) communicated with one or more core nets, for example, user equipment can be mobile phone
(or being " honeycomb " phone), computer etc. with radio communication function, user equipment can also be portable, pocket,
Hand-held, built-in computer or vehicle-mounted mobile device.
SQAM (Spreading Quadrature Amplitude Modulation, extending quadrature amplitude modulation) is handle
For QAM modulation technology with spreading the modulation system being combined, the modulation system mainly used in wireless communication system at present is SQPSK
(Spreading Quadrature Phase Shift Keying, extending phase-shift keying (PSK)), i.e., by 4 rank QAM (i.e. QPSK modulation)
With the modulation system that spread spectrum is combined.Specifically same QPSK symbols S is sent out twice, is S and S conjugation respectively
Conj (S), equivalent to spread spectrum 2 times.Because the symbol S and conj (S) of transmission take two time frequency units, in different subcarriers
It is transmitted, therefore the diversity gain of two running time-frequency resources can be obtained in wireless channel, ensure that the reliable of signal transmission
Property.
In the wireless communication system based on OFDM technology, for example, IEEE802.11ad, SQPSK be basic modulation system it
One, Figure 1A give the signal processing system schematic diagram that SQPSK is combined with OFDM technology, below in conjunction with the schematic diagram to the letter
Number processing method illustrates.
101, binary bits information flow { ckEntering segmentation module, segmentation module is by binary bits information flow { ckStream
It is divided into multiple bit blocks, every piece has N number of bit, is denoted as (c1,c2,…,cN), wherein N is subcarrier number, can be OFDM systems
It is used for whole the subcarriers or portion subcarriers of data transfer in system；Each bit block is inputted into QPSK modulation modules.
102, after each bit block inputs QPSK modulation modules, by taking a bit block as an example, QPSK modulation modules are to described
Bit block carries out QPSK modulation, exports multiple QPSK symbols to mapping block and conjugate module.
By taking a bit block as an example, using each two bit as a pair of bits, QPSK modulation modules are each to bit
(c2k-1,c2k), wherein k=1,2 ..., N/2, a QPSK constellation point being mapped in QPSK planispheres, N/2 is exported after mapping
Individual QPSK symbols (d1,d2,…,dN/2) arrive mapping block and conjugate module.
103, N/2 QPSK symbol (d of the conjugate module to input1,d2,…,dN/2) conjugation processing is done, generate conjugate of symbol
dP(k), it is specifically as follows dP(k)=conj (dk), export N/2 QPSK conjugates of symbol (dP(1),dP(2),…,dP(N/2)) arrive mapping mould
Block.
So, a symbol dkIt has been transmitted twice, respectively dkAnd dP(k), equivalent to having spread 2 times, frequency expansion sequence phase
When in [+1 ,+1].
The N/2 QPSK symbols (d in above-mentioned steps 1021,d2,…,dN/2) and step 103 in beat up N/2 QPSK
Conjugate of symbol (dP(1),dP(2),…,dP(N/2)) input mapping block.
104, mapping block is by the N/2 QPSK symbols (d1,d2,…,dN/2) and the N/2 QPSK conjugates of symbol
(dP(1),dP(2),…,dP(N/2)), N number of symbol, is sequentially mapped on N number of subcarrier in order altogether.
Specific method is by QPSK symbols dkIt is mapped to k-th of subcarrier, wherein k=1,2 ..., N/2；QPSK is conjugated
Symbol dP(k)It is mapped to P (k)=k+N/2 subcarrier, wherein k=1,2 ..., N/2；Therefore, dkTake OFDM of half
Carrier wave, dP(k)Take other half OFDM subcarriers.Then N number of symbol after mapping is inputted into OFDM modules.
105, OFDM modules carry out OFDM processing to N number of symbol after mapping, and output includes the baseband signal of I/Q two-way.
OFDM processing procedures are prior arts, are no longer described in detail.
Above-mentioned SQPSK-OFDM signal processings are applied in IEEE802.11ad.
In a specific embodiment of the invention, above-mentioned signal processing method is improved, specifically, being to step
104 mapping method is improved, QPSK symbols dkThe mapping method of step 104 is still used, is sequentially mapped in order
Preceding N/2 subcarrier, but QPSK conjugates of symbol dP(k)According to QPSK symbols dkOpposite Sequential Mapping is to rear N/2 subcarrier；
With reference to figure 1B, this method specifically includes：
201~203, with step 101~103；No longer it is described in detail.
204, mapping block is by N/2 QPSK symbols (d1,d2,…,dN/2) the 1st to of OFDM the is sequentially mapped in order
On N/2 subcarrier；By QPSK conjugates of symbol (dP(1),dP(2),…,dP(N/2)) mapped successively by the order opposite with QPSK symbols
To OFDM N/2+1 to n-th subcarrier, N number of symbol after mapping is then inputted into OFDM modules.
Specifically mapping method is：QPSK symbols dkK-th of subcarrier, wherein k=1 are mapped to, 2 ..., N/2, takes one
Half OFDM subcarriers；By QPSK conjugates of symbol dP(k)It is mapped to P (k)=N-k+1 subcarrier, wherein k=1,2 ..., N/
2, take other half OFDM subcarriers.
205, with step 105；No longer it is described in detail.
Fig. 2 gives the schematic diagram of the above two different mappings result that different mappings method obtains, as of subcarrier
When number is 8, i.e. during N=8, subcarrier number is followed successively by 1-8, and the left side of figure is using the mapping result obtained after step 104, figure
Right side be using the mapping result obtained after step 204.I.e. the 1-4 qam symbol is sequentially mapped to the 1-4 subcarrier,
The 1-4 QAM conjugate of symbol is sequentially mapped to the 5-8 subcarrier by the opposite mapping order of qam symbol.
Above method embodiment illustrates by taking 4 rank QAM modulations (i.e. QPSK modulation) as an example, and those skilled in the art can know
Road, 16 rank QAM, 64 rank QAM etc. can equally fit with the aforedescribed process, it is only necessary to replace with the QPSK modulation modules in Fig. 1
Q-QAM modules, Q represent QAM exponent numbers；QAM modules export N/2 qam symbol (d1,d2,…,dN/2) arrive mapping block and be total to
Yoke module, conjugate module output for N/2 QAM conjugates of symbol (dP(1),dP(2),…,dP(N/2)) arrive mapping block, other steps
It is consistent with above-described embodiment.
Above-described embodiment can be summarized as follows：
QAM modulation is carried out to bit block, exports multiple qam symbols, the bit block includes multiple bits；To the multiple
Qam symbol does conjugation processing, exports multiple conjugates of symbol；The multiple qam symbol is sequentially mapped to the 1st to the N/2 son
On carrier wave, the multiple conjugate of symbol is sequentially mapped to N/2+ according to the mapping order opposite with the N/2 qam symbol
1 on n-th subcarrier；Wherein N is the number of subcarrier.
Under normal circumstances, the qam symbol number is less than or equal to N/2, and QAM conjugate of symbol numbers are again smaller than equal to N/2.QAM is accorded with
Number and conjugate of symbol total quantity be less than or equal to sub-carrier number N.
In addition, the angle of the mapping block from Figure 1B, the embodiment of the invention also discloses a kind of mapping method, including：
Receive multiple qam symbols and multiple QAM conjugates of symbol；
The N/2 qam symbol is sequentially mapped on the 1st to the N/2 subcarrier, by the N/2 conjugate of symbol
N/2+1 is sequentially mapped to n-th subcarrier according to the mapping order opposite with the N/2 qam symbol；Wherein N is
The number of subcarrier.Specific mapping method is consistent with above-described embodiment.
Under normal circumstances, the qam symbol number is less than or equal to N/2, and QAM conjugate of symbol numbers are again smaller than equal to N/2.QAM is accorded with
Number and conjugate of symbol total quantity be less than or equal to sub-carrier number N.
The above method is write from the angle of mapping block, treated before not considering qam symbol and QAM conjugates of symbol
Journey.
Above-described embodiment spread spectrum is to be limited in the situation that spreading factor is 2, does not provide more general spread spectrum scheme, such as expands
The frequency factor is more than 2 situation.
Fig. 3 gives the signal processing system schematic diagram that QAM is combined with OFDM technology, below in conjunction with the schematic diagram to this
Signal processing method illustrates.
Consider the general case of Q-QAM modulation, Q is QAM exponent numbers, Q=22q, q is natural number, such as 1,2,3,4 etc.；Spread spectrum because
Son is 2M, and wherein M is less than N/2 natural number, and N/2M is even number, and N is subcarrier number, can be to be used to count in ofdm system
According to the whole subcarriers or portion subcarriers of transmission.With reference to figure 3, this method flow is as follows：
301, binary bits information flow { ckEntering segmentation module, segmentation module is by binary bits information flow { ckStream
It is divided into multiple bit blocks, each bit block is inputted into Q-QAM modules；
Specifically, every piece there can be Nq/M bit, (c is denoted as1,c2,…,cNq/M), Nq/M is (N × q)/M meaning.
Then each bit block input Q-QAM modules are modulated.
302, after each bit block inputs Q-QAM modules, by taking a bit block as an example, Q-QAM modules are to the bit block
Q rank QAM modulations are carried out, export multiple qam symbols to spread spectrum module and conjugate module.
By taking a bit block as an example, Q-QAM modules are per 2q bit (c2q(k-1)+1,…c2qk) it is mapped to Q-QAM constellations
A Q-QAM constellation point in figure；Then N/2M Q-QAM symbols (d is exported1,d2,…,dN/2M) arrive spread spectrum module and conjugation mould
Block, wherein k=1,2 ..., N/2M, N/2M implication are N/ (2 × M).
303, conjugate module is conjugation processing, generation conjugate of symbol d to N/2M Q-QAM symbol of inputP(k), it is denoted as
dP(k)=conj (dk), export N/2M Q-QAM conjugates of symbol (dP(1),dP(2),…,dP(N/2M)) arrive spread spectrum module.
Therefore, two-way symbol have input spread spectrum module altogether, be all the way N/2M qam symbol (d of Q-QAM modules output1,
d2,…,dN/2M), another way is N/2M QAM conjugates of symbol (d of conjugate module outputP(1),dP(2),…,dP(N/2M))。
304, the input of spread spectrum module is by N/2M qam symbol (d1,d2,…,dN/2M) and N/2M QAM conjugate of symbol
(dP(1),dP(2),…,dP(N/2M)) composition N/M symbol, spectrum-spreading unit is to incoming symbol dkAnd dP(k)Carry out M times of spread spectrum.
Specifically spectrum spreading method can be：
d’(k-1)M+1=dk×s1,d’(k-1)M+2=dk×s2,…,d’kM=dk×sM；K=1,2 ..., N/2M；
d’P(k)=dP(k)×sM+1,d’P(k)+1=dP(k)×sM+2…,d’P(k)+M-1=dP(k)×s2M；K=1,2 ..., N/2M；
Wherein { sm, m=1,2 ..., 2M } it is the frequency expansion sequence that length is 2M.
So spread spectrum module exports N number of symbol after spreading to mapping block, specifically includes the QAM symbols after N/2 spread spectrum
Number (d '1,d’2,…,d’N/2) and N/2 spread spectrum after QAM conjugates of symbol (d 'P(1),d’P(1)+1,…,d’P(1)+M-1,…,
d’P(N/2M),d’P(N/2M)+1,…,d’P(N/2M)+M-1；).
305, this N number of symbol after spreading is mapped on OFDM N number of subcarrier by mapping block, wherein, by N/2 expansion
Qam symbol (d ' after frequency1,d’2,…,d’N/2) be sequentially mapped in order on the 1st to the N/2 subcarrier, by N/2 spread spectrum
QAM conjugates of symbol (d ' afterwardsP(1),d’P(1)+1,…,d’P(1)+M-1,…,d’P(N/2M),d’P(N/2M)+1,…,d’P(N/2M)+M-1；) press
N/2+1 is sequentially mapped to n-th subcarrier according to the order opposite with qam symbol, i.e., is total to the QAM after N/2 spread spectrum
Yoke symbol (d 'P(1),d’P(1)+1,…,d’P(1)+M-1,…,d’P(N/2M),d’P(N/2M)+1,…,d’P(N/2M)+M-1；) in sequence successively
It is mapped on N to the N/2+1 subcarrier.
Specific method is by symbol d 'kIt is mapped to k-th of subcarrier, wherein k=1,2 ..., N/2；
By symbol d 'P(k)+mIt is mapped to P (k)+m subcarriers, wherein k=1,2 ..., N/2M；M=0,1 ... M-1；Its
Middle P (k)=N-M × k+1.
Then N number of symbol after mapping is inputted into OFDM modules.
Assuming that N=8, the schematic diagram after mapping equally may be referred to Fig. 2.
306, OFDM modules carry out OFDM processing to N number of symbol after mapping, and output includes the baseband signal of I/Q two-way.
OFDM resume module processes are prior arts, are no longer described in detail.
The present embodiment has compared more than upper one embodiment the step of spread spectrum, spreading factor 2M, M=2n, n >=0, QAM
Modulation is not limited to 4 ranks, can be 16 rank QAM, 64 rank QAM, 256 rank QAM etc..When QAM modulation is 4 ranks, spreading factor 2
When, i.e., as n=0, M=1,1 times of Ze Mei roads symbols spread, then it is equal to the embodiment described in Figure 1B, if n is nature
Number, such as 1,2,3 etc., then it is 2 situations to eliminate the spreading factor described in Figure 1B embodiment.The present embodiment realizes more logical
SQAM modulated signal processing procedures based on ofdm system.
Above-described embodiment may be summarized as follows：
QAM modulation is carried out to bit block, exports multiple qam symbols, the bit block includes multiple bits；To the multiple
Qam symbol does conjugation processing, exports multiple conjugates of symbol；The multiple qam symbol and the multiple conjugate of symbol are entered respectively
Row spread processing, export the qam symbol after multiple spread spectrums and the conjugate of symbol after multiple spread spectrums；After the multiple spread spectrum
Qam symbol is sequentially mapped on the 1st to the N/2 subcarrier, by the conjugate of symbol after the multiple spread spectrum according to it is described more
The opposite mapping order of qam symbol after individual spread spectrum is sequentially mapped to N/2+1 to n-th subcarrier；Wherein N is subcarrier
Number.
Under normal circumstances, the qam symbol number after the spread spectrum is less than or equal to N/2, and the QAM conjugate of symbol numbers after spread spectrum are also small
In equal to N/2；The conjugate of symbol total quantity after qam symbol and spread spectrum after spread spectrum is less than or equal to sub-carrier number N.
In addition, the angle of the mapping block from Fig. 3, the embodiment of the invention also discloses a kind of mapping method, including：
Receive the qam symbol after multiple spread spectrums and the QAM conjugates of symbol after multiple spread spectrums；
Qam symbol after the multiple spread spectrum is sequentially mapped on the 1st to the N/2 subcarrier, by the multiple expansion
QAM conjugates of symbol after frequency are sequentially mapped to N/2+1 to n-th according to the mapping order opposite with the multiple qam symbol
On subcarrier；Wherein N is the number of subcarrier.Specific mapping method is consistent with above-described embodiment.
In above-described embodiment, the qam symbol after spread spectrum is less than or equal to N/2, the QAM conjugates of symbol number after spread spectrum again smaller than etc.
In N/2；The conjugate of symbol total quantity after qam symbol and spread spectrum after spread spectrum is less than or equal to sub-carrier number N.
The above method is write from the angle of mapping block, treated before not considering qam symbol and QAM conjugates of symbol
Journey.
It should be noted that each embodiment of the present invention is illustrated by taking QAM modulation as an example, this is the most frequently used at present
Modulation system, if also other modulation systems produce other modulation symbols, can similarly use the letter of the present invention
Number processing method and mapping method, are no longer described in detail.
In the above method of the embodiment of the present invention, due to QAM conjugates of symbol being carried out according to the order opposite with qam symbol
The mapping of subcarrier, receiving side are uneven part I/Q using the relation on two symmetrical subcarriers after OFDM demodulation is carried out
Distorted signal caused by weighing apparatus becomes useful signal from interference, therefore, under the conditions of I/Q is unbalanced, to improve the nothing of signal
Line transmission reliability, further lifts receptivity.
Based on SQAM-OFDM signal processing methods of the present invention, performed, sent before end data sends by transmitting terminal, can be with
Following configuration information is sent to receiving terminal, such as：
Order of modulation, it can be included in MCS (modulation and coding scheme) information；
If there is multiple spreading factors, transmitting terminal needs spreading factor 2M used by being sent to receiving terminal；If it is
System is only with a spread spectrum, then transmitting terminal need not send spreading factor to receiving terminal；
Frequency expansion sequence, if there is multiple frequency expansion sequences, transmitting terminal needs to send currently employed spread spectrum to receiving terminal
Sequence number；
Based on SQAM-OFDM schemes of the present invention, transmitting terminal can pass through control channel, broadcast to the configuration information of receiving terminal
Channel or data channel are sent to receiving terminal in advance.Receiving terminal is after these configuration informations are received, based on these configuration informations
Carry out SQAM-OFDM demodulation.
The SQAM-OFDM signal transacting schemes of the embodiment of the present invention may apply in multi-carrier communications systems.Such as：
IEEE802.11ay has determined the data using multiple carrier-wave transmission higher rates, and the bandwidth of each carrier wave is 2.16GHz.
Useful application is in the 5G communication systems in future, and the joint transmission of multiple carrier waves is in two kinds of situation.
Continuous multicarrier：Multiple carrier waves are continuous on frequency spectrum；In this case, by above-mentioned Fig. 1 or Fig. 3 shown in embodiment
In N be substituted for N '=Nc* N, wherein NcIt is variable number, such as takes 2 or 4；N is the number of the subcarrier of each carrier wave, other
Step is constant.
Discrete multitone, DMT：Multiple carrier waves are discontinuous on frequency spectrum.In this case each carrier wave each does OFDM modulatedemodulates
Adjust.SQAM-OFDM signal transactings scheme in above-described embodiment is applied to discrete multitone, DMT situation, i.e., different carrier-wave transmissions are different
Data.Assuming that there is NcIndividual carrier wave, the bit stream that each carrier wave needs to modulate areIt is then each
Individual carrier wave does SQAM-OFDM signal transactings according to the step of embodiment shown in Fig. 1 or Fig. 3 respectively, the hair as n-th of carrier wave
The number of delivering letters.
The SQAM-OFDM signal transactings scheme of the present invention can also be applied to SU-MIMO (single user
Multiple-input multiple-output) situation.Such as：IEEE802.11ay, which can configure SU-MIMO, to be allowed to transmit Ns
Individual independent data flow, wherein Ns=2,4.It is divided into following several situations：
Single carrier wave SU-MIMO is transmitted：The SQAM-OFDM of the present invention is applied to the SU-MIMO situations of single carrier wave, e.g.,
Base station is that some user equipment prepares NsIndividual independent data bit streamEach bit flow point
Corresponding step is not performed according to the embodiment shown in Fig. 1 or Fig. 3, SQAM-OFDM signal transactings are carried out, as n-th antenna
Transmission signal.
Multiple continuous carrier SU-MIMO transmission：The SQAM-OFDM of the present invention is applied to the SU-MIMO situations of multiple continuous carriers, first
First prepare N for some user equipmentsIndividual independent length is N '=Nc* N data bit flow
Wherein NcIt is variable number, each data bit flow is done at SQAM-OFDM signals according to the step of Fig. 1 or Fig. 3 embodiments respectively
Reason, wherein N is substituted for into N ', the transmission signal exported as n-th antenna of SQPSK-OFDM modulation.
Multiple discrete carrier SU-MIMO transmission：The SQAM-OFDM of the present invention is applied to the SU-MIMO situations of multiple continuous carriers, first
First prepare N for some userc*NsIndividual independent length is N data bit flow
Wherein NcIt is variable number, Ns is antenna number；Each data bit flow is done according to the step of Fig. 1 or Fig. 3 embodiments respectively
SQAM-OFDM signal transactings, the output of SQAM-OFDM modulation is as n-thsRoot antenna and n-thcThe transmission signal of individual carrier wave.
SQAM-OFDM schemes of the present invention are applied to multicarrier, SU-MIMO situation, and transmitting terminal before transmitting data, needs
Following configuration information is sent to receiving terminal：
The number of multicarrier, such as with two bits, represent 1/2/3/4 carrier wave；
Whether multicarrier is discrete or continuous, such as represents discrete or continuous with a bit；
The data fluxion of SU-MIMO transmission, such as represent 1/2/4 data flow with two bits；
Based on SQAM-OFDM schemes of the present invention, transmitting terminal to receiving terminal configuration information can by control channel or
Broadcast channel or data channel are sent to receiving terminal in advance.Receiving terminal is after these configuration informations are received, based on these configurations
Information carries out SQAM-OFDM demodulation.
Further extension and popularization, the program can also be applied to MU-MIMO (multi-user multiple-
input multiple-output)。
Above-mentioned each method embodiment can be performed by the equipment of network side, such as base station, access point etc., can also by terminal Lai
Perform, such as mobile phone, notebook computer, vehicle-mounted mobile etc., the method executive agent of corresponding diagram 1B embodiment, the present invention is also
Signal processing apparatus in a kind of ofdm system is provided, with reference to figure 4, the device includes：
Modulation module 401, for carrying out QAM modulation to bit block, N/2 qam symbol of output to conjugate module 402 and reflects
Module 403 is penetrated, the bit block includes multiple bits；
Conjugate module 402, for doing conjugation processing, N/2 conjugate of symbol of output to mapping to the N/2 qam symbol
Module 403；
Mapping block 403, for the N/2 qam symbol to be sequentially mapped into the 1st to the N/2 subcarrier, by institute
State N/2 conjugate of symbol and be sequentially mapped to N/2+1 to n-th according to the mapping order opposite with the N/2 qam symbol
On carrier wave；Wherein N is the number of subcarrier.
With reference to above-mentioned aspect, wherein the QAM modulation is modulated for QPSK.
Further, the device can also include segmentation module 400, for binary bits information flow to be divided into bit
Block, the bit block is inputted into modulation module 401；The bit block of generation is usually multiple.
The device can further include OFDM module (not shown)s, for being reflected to the output of mapping block 403
N number of symbol after penetrating carries out OFDM processing, and output includes the baseband signal of I/Q two-way.OFDM processing procedures are prior arts, no
It is described in detail again.
Said apparatus can correspond to the executive agent of block diagram 1B embodiment of the method, and corresponding module performs accordingly respectively
Method and step, be not described in detail one by one.
Another aspect, the method executive agent of the embodiment of corresponding diagram 3, the present invention also provide signal in a kind of ofdm system
Processing unit, with reference to figure 5, including：
Modulation module 501, for carrying out QAM modulation to bit block, multiple qam symbols is exported to conjugate module 502 and are expanded
Frequency module 503, the bit block include multiple bits；
Conjugate module 502, for doing conjugation processing to the multiple qam symbol, multiple conjugates of symbol are exported to spread spectrum mould
Block 503；
Spread spectrum module 503, for carrying out spread processing respectively to the multiple qam symbol and the multiple conjugate of symbol,
The conjugate of symbol after qam symbol and N/2 spread spectrum after N/2 spread spectrum of output；
Mapping block 504, carried for the qam symbol after described N/2 spread spectrum to be sequentially mapped into the 1st to the N/2 son
On ripple, by the conjugate of symbol after described N/2 spread spectrum according to the mapping order opposite with the qam symbol after described N/2 spread spectrum
N/2+1 is sequentially mapped to n-th subcarrier；Wherein N is the number of subcarrier.
With reference to above-mentioned aspect, the qam symbol is that N/ (2M) is individual, and the conjugate of symbol is that N/ (2M) is individual；At the spread spectrum
Manage as M times of spread processing, M=2n, n is natural number.
With reference to above-mentioned aspect, wherein, the QAM modulation is Q ranks, Q=22q, q is natural number.
Further, the device can also include segmentation module 500, for binary bits information flow to be divided into bit
Block, the bit block is inputted into modulation module 501；The bit block of generation is usually multiple.
The device can further include OFDM module (not shown)s, for being reflected to the output of mapping block 504
N number of symbol after penetrating carries out OFDM processing, and output includes the baseband signal of I/Q two-way.OFDM processing procedures are prior arts, no
It is described in detail again.
Said apparatus can perform corresponding side respectively with the executive agent of the embodiment of the method for corresponding diagram 3, corresponding module
Method step, it be not described in detail one by one.
Above-mentioned two device embodiment also has the embodiment of another form, with reference to figure 6, including processor, transceiver, deposits
Reservoir, transceiver are used to carry out signal transmitting-receiving process, and processor is used to perform all kinds of handling processes, such as：It can realize
Appoint in modulation module 401 in device shown in Fig. 4, conjugate module 402, mapping block 403, segmentation module 400 and OFDM modules
The function of one or more modules of meaning；Can also realize can realize modulation module 501 in device shown in Fig. 5, be conjugated mould
The work(of arbitrary one or more modules in block 502, spread spectrum module 503, mapping block 504, segmentation module 500 and OFDM modules
Energy.
Alternatively, each component of the equipment in Fig. 6 is coupled by bus system, and wherein bus system is removed and included
Outside data/address bus, in addition to power bus, controlling bus and status signal bus in addition.
Equipment shown in Fig. 6 can realize each process realized in the embodiment of foregoing each method, to avoid weight
It is multiple, repeat no more here.
In addition, only considering the situation of mapping block in corresponding method embodiment, the embodiment of the invention also discloses one kind to believe
Number processing unit, including：
Receiving unit：Receive N/2 qam symbol and N/2 QAM conjugate of symbol；
Map unit：The N/2 qam symbol is sequentially mapped on the 1st to the N/2 subcarrier, by the N/2
Conjugate of symbol is sequentially mapped to N/2+1 to n-th subcarrier according to the mapping order opposite with the N/2 qam symbol；
Wherein N is the number of subcarrier.
Or
Receiving unit：For receiving N/2 qam symbol and N/2 QAM conjugate of symbol；
Map unit：The N/2 qam symbol is sequentially mapped on the 1st to the N/2 subcarrier, by the N/2
Conjugate of symbol is sequentially mapped to N/2+1 to n-th subcarrier according to the mapping order opposite with the N/2 qam symbol；
Wherein N is the number of subcarrier.
Specific mapping method has been described in detail in above method embodiment.
The embodiment of another corresponding form, above-mentioned receiving unit can realize that map unit can be used with receiver
Processor is realized.
It should be understood that in embodiments of the present invention, the processor can be CPU (Central Processing
Unit, referred to as " CPU "), the processor can also be other general processors, digital signal processor (DSP), special integrated
Circuit (ASIC), ready-made programmable gate array (FPGA) either other PLDs, discrete gate or transistor logic
Device, discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional place
Manage device etc..
The memory can include read-only storage and random access memory, and provide instruction and data to processor.
The a part of of memory can also include nonvolatile RAM.For example, memory can be with storage device type
Information.
It is total can also to include power bus, controlling bus and status signal in addition to including data/address bus for the bus system
Line etc..But for the sake of clear explanation, various buses are all designated as bus system in figure.
It should be understood that the terms "and/or", only a kind of incidence relation for describing affiliated partner, expression can deposit
In three kinds of relations, for example, A and/or B, can be represented：Individualism A, while A and B be present, these three situations of individualism B.
In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.
It should be understood that in various embodiments of the present invention, the size of the sequence number of above-mentioned each process is not meant to perform suitable
The priority of sequence, the execution sequence of each process should be determined with its function and internal logic, without the implementation of the reply embodiment of the present invention
Process forms any restriction.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Division, only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The mutual coupling discussed or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit
Close or communicate to connect, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.
If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of signal processing method, including：
QAM modulation is carried out to bit block, exports N/2 qam symbol, the bit block includes multiple bits；
Conjugation processing is done to the N/2 qam symbol, exports N/2 conjugate of symbol；
The N/2 qam symbol is sequentially mapped on the 1st to the N/2 subcarrier, by the N/2 conjugate of symbol according to
The mapping order opposite with the N/2 qam symbol is sequentially mapped to N/2+1 to n-th subcarrier；
Wherein N is the number of subcarrier.
2. the method for claim 1, wherein the N/2 qam symbol is (d1,d2,…,dN/2), N/2 conjugation symbol
Number it is (dP(1),dP(2),…,dP(N/2)), the mapping step includes：
By symbol dkIt is mapped to k-th of subcarrier；
By symbol dP(k)It is mapped to the individual subcarriers of P (k), P (k)=N-k+1；
Wherein k=1,2 ..., N/2.
3. a kind of signal processing method, including：
QAM modulation is carried out to bit block, exports multiple qam symbols, the bit block includes multiple bits；
Conjugation processing is done to the multiple qam symbol, exports multiple conjugates of symbol；
Carry out spread processing respectively to the multiple qam symbol and the multiple conjugate of symbol, export the QAM after N/2 spread spectrum
Conjugate of symbol after symbol and N/2 spread spectrum；
Qam symbol after described N/2 spread spectrum is sequentially mapped on the 1st to the N/2 subcarrier, by described N/2 spread spectrum
Conjugate of symbol afterwards is sequentially mapped to N/2+1 to the according to the opposite mapping order of qam symbol after described N/2 spread spectrum
On N number of subcarrier；
Wherein N is the number of subcarrier.
4. method as claimed in claim 3, it is characterised in that：
The qam symbol is that N/ (2M) is individual, and the conjugate of symbol is that N/ (2M) is individual；
The spread processing is M times of spread processing, M=2n, n is natural number.
5. the method as described in any one of claim 3 or 4, wherein, the QAM modulation is Q ranks, Q=22q, q is natural number.
6. a kind of signal processing apparatus, including：
Modulation module, for carrying out QAM modulation to bit block, N/2 qam symbol is exported, the bit block includes multiple bits；
Conjugate module, for doing conjugation processing to the N/2 qam symbol, export N/2 conjugate of symbol；
Mapping block, for the N/2 qam symbol to be sequentially mapped into the 1st to the N/2 subcarrier, by the N/2
Conjugate of symbol is sequentially mapped to N/2+1 to n-th subcarrier according to the mapping order opposite with the N/2 qam symbol；
Wherein N is the number of subcarrier.
7. device as claimed in claim 6, wherein, the QAM modulation is Q ranks, Q=22q, q is natural number.
8. a kind of signal processing apparatus, including：
Modulation module, for carrying out QAM modulation to bit block, multiple qam symbols are exported, the bit block includes multiple bits；
Conjugate module, for doing conjugation processing to the multiple qam symbol, export multiple conjugates of symbol；
Spread spectrum module, for carrying out spread processing respectively to the multiple qam symbol and the multiple conjugate of symbol, export N/2
The conjugate of symbol after qam symbol and N/2 spread spectrum after individual spread spectrum；
Mapping block, will for the qam symbol after described N/2 spread spectrum to be sequentially mapped into the 1st to the N/2 subcarrier
Conjugate of symbol after the N/2 spread spectrum maps successively according to the mapping order opposite with the qam symbol after described N/2 spread spectrum
To N/2+1 to n-th subcarrier；
Wherein N is the number of subcarrier.
9. device as claimed in claim 8, it is characterised in that：
The qam symbol is that N/ (2M) is individual, and the conjugate of symbol is that N/ (2M) is individual；
The spread processing is M times of spread processing, M=2n, n is natural number.
10. the device as described in any one of claim 8 or 9, wherein, the QAM modulation is Q ranks, Q=22q, q is nature
Number.
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| WO2017193834A1 (en) | 2017-11-16 |
| CN107370707B (en) | 2020-06-16 |
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