CN107528807A - A kind of spatial modulation MQAM signal detecting methods based on phase judgement - Google Patents

A kind of spatial modulation MQAM signal detecting methods based on phase judgement Download PDF

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Publication number
CN107528807A
CN107528807A CN201611144359.1A CN201611144359A CN107528807A CN 107528807 A CN107528807 A CN 107528807A CN 201611144359 A CN201611144359 A CN 201611144359A CN 107528807 A CN107528807 A CN 107528807A
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symbol
spatial modulation
mqam
phase
signal detecting
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CN107528807B (en
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陈发堂
刘燕
李小文
王丹
刘宇
王华华
冯永帅
李玉河
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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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
    • H04L27/38—Demodulator circuits; Receiver circuits
    • 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
    • H04L27/36—Modulator circuits; Transmitter circuits

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A kind of spatial modulation MQAM signal detecting methods based on phase judgement are claimed in the present invention; belong to mobile communication signal detection technique field; the present invention demodulates angle from the maximal possibility estimation (ML) that two-dimensional vector quantifies, and gives the method for simplifying of maximal possibility estimation.According to the characteristic of MQAM planispheres, judged using the phase of modulation symbol, it is proposed that a kind of spatial modulation MQAM signal detecting methods (PDM) based on phase judgement.Present invention, avoiding in ML associated detecting methods to modulating the search of symbol space, the low complexity of very big land price.The present invention has relatively low complexity not only proximate to ML performance, there is fabulous theoretical and practical significance.The present invention has preferable practical application meaning in antenna technology and green communications technology.

Description

A kind of spatial modulation MQAM signal detecting methods based on phase judgement
Technical field
The present invention relates to moving communicating field, and in particular to a kind of spatial modulation MQAM signals inspection based on phase judgement Survey method.
Background technology
SM (spatial modulation) can be utilized as the new technology in MIMO (multiple-input and multiple-output) system, the technology and be sent day Line sequence number transmits channel bit, while avoids interchannel interference, therefore one of focus studied as everybody.Spatial modulation In system, information bit is divided into two parts, a part is mapped in selected antenna serial number, and another part is mapped to traditional tune On planisphere processed, therefore the space dimension that effectively can be formed using transmission antenna sequence number is come transmission information bit.It is in addition, empty Between modulating system in same sending time slots, only allow an antenna activation, other antennas keep silent status, so effective The interchannel interference avoided.
In spatial modulation system, spectrum efficiency calculation formula is：η=log2Nt+log2M.The message bit stream inputted According to log2Nt+log2M length is divided into some frames, wherein NtThe number of transmission antenna is represented, M represents modulated signal points, Spatial modulation system transmitting antenna number is necessary for 2 power side.In each frame information bit, preceding log2NtBit is used to determine In NtA transmission antenna is selected to carry out this data transfer, rear log in root transmission antenna2M bit are used to select to accord with modulation Number concentrate select which symbol sent.
Space-modulation technique is signal detection, modulation technique as the research of extensive MIMO technology is risen in recent years Even channel estimation technique all largely continues to use MIMO correlation criterion, although system model and principle are roughly the same, Space-modulation technique improves to some extent after all, thus continues to use the correlation technique in MIMO technology and lack spatial modulation own characteristic and category Property, the advantages of more space-modulation techniques itself and characteristic is still to be studied.The research tendency of detection method is rendered as how passing through Linguistic term reduces method computation complexity, improves detection performance.Therefore, in the mimo system of spatial modulation, to detection side Method is studied, and the accuracy in detection by studying and improving signal detecting method has certain guarantee, while method stream It is very significant that journey, calculating process are again uncomplicated.The principle of maximal possibility estimation (ML) is to search for all transmission symbols Number possibility, find the combination of most suitable antenna serial number and modulation symbol, therefore can obtain closest to bit error rate performance, claim On be best performance detection method.But this method search target is excessive, it is sufficiently complex to implement step, extensive It is difficult to practical application in antenna system.The characteristics of present invention is by studying MQAM planispheres, the complexity of symbol search is reduced, Difficult point is the possible constellation point for estimating different amplitudes.Therefore, the present invention proposes a kind of sky based on phase judgement Between modulate MQAM signal detecting methods, this method can effectively reduce the computation complexity of receiving terminal, and with modulation point Several increase performances is better.The computation complexity of ML methods is 6NrNtM, the complexity of method proposed by the present invention is (6Nr+2+ 5R)Nt。
The content of the invention
Present invention seek to address that above problem of the prior art.Propose a kind of low receiving terminal computation complexity based on phase The spatial modulation MQAM signal detecting methods of position judgement.Technical scheme is as follows：
A kind of spatial modulation MQAM signal detecting methods based on phase judgement, it comprises the following steps：
First, in spatial modulation system, the test problems that spatial modulation system is sent to symbol are converted into quantization demodulation Problem；Secondly according to the characteristic distributions of constellation point in planisphere, the reception signal after conversion is quantified, then according to quantization The phase size of signal is transmitted the estimation of symbol afterwards, then carries out maximum likelihood optimal estimation to activation antenna index；Finally Obtain the signal detecting result of spatial modulation system.
Further, it is specific to be converted into quantization demodulation problem for the test problems by spatial modulation system transmission symbol For：In spatial modulation system, ML maximal possibility estimations can be expressed as 2 nested search problems, i.e., first to sending symbol s Search, then antenna index l is searched for, it can be expressed asWherein,Represent transmission antenna Index,Represent to send symbol, y represents reception signal vector, hlRepresent the l row of channel matrix.For interior optimization problemUnder conditions of i.e. given activation antenna index l, solve and send symbol s, to MQAM modulated signals, Interior optimization problem is still equivalent toWherein,SM systems can be sent symbol Test problems be converted into quantify demodulation problem.
Further, in the planisphere according to MQAM constellation point characteristic distributions, to after conversion reception signal carry out Quantify, the optimal estimation value for judging to send signal specifically includes：
The M constellation point according to corresponding to going out the MQAM signal of change of different points has the constellation point of R different amplitudes, each Amplitude arranges respectively A from small to large1,A2..., Ar..., AR, i.e., it is A that this M constellation point, which is distributed in R radius,1, A2..., Ar..., ARConcentric circles on, the number of constellation points on each circle is m1, m2..., mr..., mR, for MQAM planispheres, it is assumed that initial phase For 0, then i-th of constellation point on r-th of circle can be expressed asWherein ir=1,2 ..., mr,For given antenna l, calculateRepresent the phase of transmission symbol estimated.SM systems In interior optimization problem can be equivalent toWherein 0≤θl≤ 2 π, θlRepresent what is received The phase of symbol,
Further, the estimation of symbol phase is transmitted according to the phase size for receiving symbol：Utilize formulaWherein A is signal amplitude, calculates corresponding transmission symbol
Further, described pair of activation antenna index, which carries out maximum likelihood optimal estimation, includes step：It will calculate correspondingly Transmission symbolBring into ML optimal detection formula, enter the ML search of line activating antenna index, that is, haveWherein
Advantages of the present invention and have the beneficial effect that：
The present invention is judged using the phase of modulation symbol according to the characteristic of QAM constellation, avoids ML joint-detections To modulating the search of symbol space, the low complexity of very big land price in method.The present invention is not only proximate to ML performance, and have Relatively low complexity, there is fabulous theoretical and practical significance.The inventive method can apply to spatial modulation (SM) system, produce Great economic and social benefit.
Brief description of the drawings
Fig. 1 is that the present invention provides first circle of preferred embodiment 16QAM upper constellation point schematic diagram；
Fig. 2 is preferred embodiment of the present invention 8QAM planispheres；
Fig. 3 is preferred embodiment of the present invention 16QAM planispheres；
The spatial modulation MQAM signal detecting method flow charts that Fig. 4 preferred embodiment of the present invention is adjudicated based on phase；
Fig. 5 is the simulation curve schematic diagram of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, detailed Carefully describe.Described embodiment is only the part of the embodiment of the present invention.
The present invention solve above-mentioned technical problem technical scheme be：
The present invention proposes a kind of spatial modulation MQAM signal detecting methods based on phase judgement.First, in spatial modulation In system, ML maximal possibility estimations can be expressed as 2 nested search problems, i.e., first searched for sending symbol s, then to antenna L search is indexed, can be expressed asIt is can be seen that from this formula for interior optimization ProblemUnder conditions of i.e. given activation antenna index l, solve and send symbol s.MQAM is modulated Signal, interior optimization problem are still equivalent toWherein,SM systems can be sent The test problems of symbol, which are converted into, quantifies demodulation problem.Then according to the characteristic distributions of constellation point in MQAM planispheres, to conversion Reception signal afterwards is quantified, and then judges to send the optimal estimation value of signal, then carries out ML most to activation antenna index Excellent estimation.Comprise the following steps that：
Step 1：The M constellation point according to corresponding to going out the MQAM signal of change of different rank has the constellation of R different amplitudes Point, each amplitude arrange respectively A from small to large1, A2..., Ar..., AR, i.e., it is A that this M constellation point, which is distributed in R radius,1, A2..., Ar..., ARConcentric circles on, the number of constellation points on each circle is m1, m2..., mr..., mR.For MQAM planispheres, Assuming that initial phase is 0, then i-th of constellation point on r-th of circle can be expressed asWherein Ir=1,2 ..., mr,It is the constellation point on first circle under 16QAM as shown in Figure 1.Shown in Fig. 2, Fig. 3 Respectively M=8, R=2, m1=4, m2=4 and M=16, R=3, m1=4, m2=8, m3=4 planisphere.
Step 2：For given antenna l, calculateInterior optimization problem in SM systems can be equivalent toWherein 0≤θl≤ 2 π,.Receive vectorWith sending the folder between symbol s Angle beta is smaller,Value it is bigger.
Step 3：ObtainML estimates, utilize formulaWherein A is signal width Degree, calculate corresponding transmission symbol
Step 4：Symbol will be sent corresponding to calculatingBring into ML optimal detection formula, enter line activating antenna rope The ML search drawn, that is, haveWherein
Step 5：Export l and corresponding s.
It is described as follows, can be extended on the bigger MQAM signals of modulation points M with reference to Fig. 4 and way of example：
Such as：As transmitting antenna number Nt=4, reception antenna number Nr=2, symbol 16QAM, spectrum efficiency η=6bit/s/ During Hz, this method reduces about 85% compared to ML computation complexities.
Step 1：For 16QAM, planisphere is as shown in figure 3, M=16, R=3, m1=4, m2=8, m3=4.
Step 2：For given antenna l, calculateWhen, i.e., it is in radiusFirst circle When upper, the number of constellation points on this circle is 4；During r=2, i.e., it is A in radius2When on=1 second circle, the constellation point on this circle Number is 8；During r=3, i.e., it is in radiusThe 3rd circle on when, this circle on number of constellation points be 4.Work as r=1, r=3 When,As r=2, Wherein n=1,2 ..., 8.
Step 3：Will be obtained in the previous stepValue is brought intoIn obtain Utilize formulaObtain minimum PlCorresponding to value
Step 4：Symbol will be sent corresponding to calculatingBring into ML maximal possibility estimation formula, enter line activating day The ML search that clue is drawn, that is, haveWherein
Step 5：Export l and corresponding s.
Signal detecting method flow proposed by the present invention is now summarized into such as Fig. 5, for activating antenna index l, calculated first Go outThe phase of the constellation point of estimation and corresponding symbol are calculated again, finally enter the ML search of line activating antenna index.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limited the scope of the invention. After the content for having read the record of the present invention, technical staff can make various changes or modifications to the present invention, these equivalent changes Change and modification equally falls into the scope of the claims in the present invention.

Claims (5)

1. a kind of spatial modulation MQAM signal detecting methods based on phase judgement, it is characterised in that comprise the following steps：
First, in spatial modulation system, the test problems that spatial modulation system is sent to symbol are converted into quantization demodulation problem； Secondly according to the characteristic distributions of constellation point in MQAM planispheres, the reception signal after conversion is quantified, then according to quantization The phase size of signal is transmitted the estimation of symbol afterwards, then carries out maximum likelihood optimal estimation to activation antenna index；Finally Obtain the signal detecting result of spatial modulation system.
2. the spatial modulation MQAM signal detecting methods according to claim 1 based on phase judgement, it is characterised in that institute State by spatial modulation system send symbol test problems be converted into quantify demodulation problem be specially：In spatial modulation system, ML maximal possibility estimations can be expressed as 2 nested search problems, i.e., first searched for sending symbol s, then antenna index l is searched Rope, it can be expressed asWherein,Transmission antenna index is represented,Represent to send symbol, y Represent reception signal vector, hlRepresent the l row of channel matrix.For interior optimization problemI.e. Under conditions of given activation antenna index l, solve and send symbol s, to MQAM modulated signals, interior optimization problem is still equivalent toWherein,The test problems that SM systems can be sent to symbol are converted into quantization demodulation Problem.
3. the spatial modulation MQAM signal detecting methods according to claim 1 or 2 based on phase judgement, its feature exist In the characteristic distributions of constellation point, quantify to the reception signal after conversion in the planisphere according to MQAM, judge to send letter Number optimal estimation value specifically include：
The M constellation point according to corresponding to going out the MQAM signal of change of different points has the constellation point of R different amplitudes, each amplitude Row is respectively A from small to large1,A2,…,Ar,…,AR, i.e., it is A that this M constellation point, which is distributed in R radius,1,A2,…,Ar,…,AR Concentric circles on, the number of constellation points on each circle is m1,m2,…,mr,…,mR, for MQAM planispheres, it is assumed that initial phase is 0, then r-th circle on i-th of constellation point can be expressed asWherein ir=1,2 ..., mr,For given antenna l, calculate The phase of transmission symbol estimated is represented, in SM systems Interior optimization problem can be equivalent toWherein 0≤θl≤ 2 π, θlRepresent the symbol received Phase,
4. the spatial modulation MQAM signal detecting methods according to claim 3 based on phase judgement, it is characterised in that root Be transmitted the estimation of symbol according to the phase size of the symbol received, the estimation of transmission antenna using maximum likelihood estimate including： Utilize formulaWherein A is signal amplitude, calculates corresponding transmission symbol
5. the spatial modulation MQAM signal detecting methods according to claim 4 based on phase judgement, it is characterised in that institute State includes step to activation antenna index progress maximum likelihood optimal estimation：Symbol will be sent corresponding to calculatingBring into In ML optimal detection formula, enter the ML search of line activating antenna index, that is, haveWherein
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CN108881096A (en) * 2018-05-30 2018-11-23 毛述春 A kind of base station spatial modulation MQAM based on phase judgement
CN113014526A (en) * 2021-02-24 2021-06-22 广东工业大学 Layered constellation diagram construction and detection method based on spatial modulation system

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CN103023622A (en) * 2012-12-31 2013-04-03 电信科学技术研究院 Signal detection method and signal detection equipment
CN104994047A (en) * 2015-07-31 2015-10-21 电子科技大学 Antenna selection method for spatial phase modulation
CN105681236A (en) * 2016-01-13 2016-06-15 中国人民解放军国防科学技术大学 Initial value selection method of sphere decoding algorithm

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* Cited by examiner, † Cited by third party
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CN108881096A (en) * 2018-05-30 2018-11-23 毛述春 A kind of base station spatial modulation MQAM based on phase judgement
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