CN103414534B - A kind of generalized spatial modulation system receiver detection method in conjunction with threshold judgement - Google Patents
A kind of generalized spatial modulation system receiver detection method in conjunction with threshold judgement Download PDFInfo
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Abstract
The invention discloses a kind of generalized spatial modulation system receiver detection method in conjunction with threshold judgement, by sorting to emitting antenna combination, detection of transmitted signals under emitting antenna combination after adopting balanced detection algorithm to detect sequence, and it is whether reliable in conjunction with threshold judgement detection of transmitted signals, once there be reliable detection of transmitted signals namely to it can be used as final estimation to send signal, only have when all detection of transmitted signals are all unreliable, just can need to travel through all detection of transmitted signals and select optimum conduct to estimate to send signal.The present invention, by threshold judgement, can reduce the possible detection of transmitted signals number of search, thus effectively reduce the detection complexity of receiver, and obtain preferably detection perform when lower complexity.
Description
Technical field
The invention belongs to mobile communication technology field, more specifically say, relate to a kind of generalized spatial modulation system receiver detection method in conjunction with threshold judgement.
Background technology
Spatial modulation (SpatialModulation, SM) information bit of fixed qty is divided into two parts by technology, a part is for selecting transmitting antenna, another part is used for mapped constellation symbol, and the constellation symbol of mapping is transmitted by the transmitting antenna selected, non-selected transmitting antenna is then mourned in silence.Adopt SM technology can avoid MIMO(Multiple-InputMultiple-Output, multiple-input and multiple-output) interchannel interference that exists in system and the synchronous problem of transmitting antenna.And generalized space modulation (GeneralizedSpatialModulation, GSM) technology can select many transmit antennas, and transmit different constellation symbol on different transmit antennas, the availability of frequency spectrum of system is improved with this, particular content refers to: J.T.Wang, S.Y.Jia, J.Song, " Generalisedspatialmodulationsystemwithmultipleactivetran smitantennasandlowcomplexitydetectionscheme, " IEEETransactionsonWirelessCommunications, vol.11, no.4, pp.1605 – 1615, Apr.2012. space-modulation technique is expanded by generalized space modulation technique, add the number of the transmitting antenna of each gap activation, and send different modulation symbols on different transmit antennas, improve efficiency of transmission and the availability of frequency spectrum of system thus.But, based on the MIMO receiver of generalized space modulation technique when detecting, the position of transmitting antenna of activation should be detected, detect modulation symbol entrained on the transmitting antenna of each activation again, therefore want to obtain optimal performance, then need to carry out the search of traversal formula to all possible transmitting, and carry out judgement detection by the method such as maximum-likelihood criterion or maximum posteriori criterion, thus make the complexity of receiver very high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of generalized spatial modulation system receiver detection method in conjunction with threshold judgement is provided, reduces the searching times to transmitting, thus reduce the detection complexity of receiver.
For achieving the above object, the present invention, in conjunction with the generalized spatial modulation system receiver detection method of threshold judgement, is characterized in that comprising:
S1: the Received signal strength of receiver is N
rthe column vector y=Hx+n of × 1, wherein N
rfor reception antenna quantity, H is the channel matrix of mimo system, and x is the transmission signal of generalized spatial modulation system transmitter, and n is average is 0, variance is σ
2additive white Gaussian noise; Y carries out preliminary treatment to received signal, obtains the preliminary equalizing signal z of Received signal strength;
S2: select the transmitting antenna activated according to combination each in the emitting antenna combination mapping table preset, extracts the new vectorial z of element composition corresponding in preliminary equalizing signal z
k, k=1,2 ..., N, wherein N is the sum of emitting antenna combination in mapping table; According to z
kobtain the possibility weight w of respective transmit antenna combination
k;
S3: by possibility weight w
kfrom big to small emitting antenna combination is sorted, C
nrepresent the n-th emitting antenna combination after sequence;
S4: adopt balanced detection method to detect successively and obtain the rear n-th emitting antenna combination C of sequence
ncorresponding detection signal t
n, to detection signal t
ncarry out demodulation to obtain detecting constellation symbol data, constellation symbol data allocations will be detected to emitting antenna combination C
nin each antenna obtain detection of transmitted signals
judge detection of transmitted signals
whether reliable, decision threshold is V
theshold=N
rσ
2, once
wherein || ||
frepresent and ask for not this norm of Luo Beini crow, then estimate to send signal
enter step S5, otherwise continuation is carried out detecting and is judged to the emitting antenna combination after next one sequence; If all emitting antenna combination all cannot make
then from all detection of transmitted signals
middle selection optimal detection sends signal and sends signal as estimation
enter step S5;
S5: send signal according to estimation
corresponding emitting antenna combination and the mapping table of modulation constellation carry out demapping respectively, recover original binary bits information sequence.
The present invention is in conjunction with the generalized spatial modulation system receiver detection method of threshold judgement, by sorting to emitting antenna combination, detection of transmitted signals under emitting antenna combination after adopting balanced detection algorithm to detect sequence, and it is whether reliable in conjunction with threshold judgement detection of transmitted signals, once there be reliable detection of transmitted signals namely to it can be used as final estimation to send signal, only have when all detection of transmitted signals are all unreliable, just can need to travel through all detection of transmitted signals and select optimum conduct to estimate to send signal.The present invention, by threshold judgement, can reduce the possible detection of transmitted signals number of search, thus effectively reduce the detection complexity of receiver, and obtain preferably detection perform when lower complexity.
Accompanying drawing explanation
Fig. 1 is the emission process schematic diagram of generalized spatial modulation system transmitter;
Fig. 2 is a kind of embodiment schematic diagram of the present invention in conjunction with the generalized spatial modulation system receiver detection method of threshold judgement.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in and will be left in the basket here.
For the present invention will be described better, first introduce the term used by technical solution of the present invention and generalized spatial modulation system transmitter.
Emitting antenna combination: refer at transmitter N
tn is chosen arbitrarily in transmit antennas
pone group of combination of root, the N for sending information symbol chosen
proot antenna is called the transmitting antenna of activation, is non-selectedly called the transmitting antenna of mourning in silence.
Channel matrix: suppose to be flat fading channel between each transmitting antenna and each reception antenna, then the channel matrix of mimo system is:
Wherein, N
rfor the reception antenna quantity of generalized spatial modulation system receiver, h
ijfor jth, 1≤j≤N
ttransmit antennas to i-th, 1≤i≤N
rthe fading coefficients of root reception antenna and to obey average be 0, variance is the multiple Gaussian Profile of 1.
Channel submatrix: refer to the channel submatrix H corresponding to a kth emitting antenna combination
krefer to the N that this emitting antenna combination is selected
pthe N that transmit antennas is corresponding in channel matrix H
pthe submatrix of individual column vector composition.
Equivalence Euclidean distance: equal to transmit x after channel H with not Luo Beini crow this norm, the i.e. equivalent Euclidean distance d of received signal vector y
euc=|| y-Hx||
f.
Maximum-likelihood criterion is adjudicated: refer to select in possible transmitting to make equivalent Euclidean distance or the minimum signal vector of its square value as court verdict.
Theorem 1: suppose N
rfor the reception antenna number of system, σ
2for the variance of additive white Gaussian noise, if detection of transmitted signals
meet
then think this detection signal
being that detection is correct, is reliable, and concrete derivation sees FanWang, YongXiong, XiumeiYang, " ApproximateMLDetectionBasedonMMSEforMIMOSystems, " PIERSonline, vol.3, no.4, pp.475-480,2007.
Emitting antenna combination mapping table and constellation mapping table is shared between generalized spatial modulation system transmitter and receiver.If the transmitter of mimo system has N
tindividual transmitting antenna, therefrom selects N
pindividual antenna sends data, always co-exists in
individual antenna combination, selects wherein
the individual design for emitting antenna combination mapping table,
represent and round downwards.Fig. 1 is the emission process schematic diagram of generalized spatial modulation system transmitter.Constellation mapping table can be arranged according to the actual conditions of engineer applied.As shown in Figure 1, the emission process of generalized spatial modulation system transmitter comprises the following steps:
S101: suppose that in the digitlization binary source data needing to send, frame data are u=(u
1, u
2..., u
l), wherein L is frame sign.U=100111 in this example.
S102: shunt data, by a part of data
for selecting corresponding emitting antenna combination, another part data
,
For map modulation constellation symbol, wherein M is order of modulation.U in this example
1=10, u
2=0111.
S103: according to u
1map emitting antenna combination.According to emitting antenna combination mapping table in this example, the transmitting antenna of 10 correspondences is (Isosorbide-5-Nitrae).
S104: according to u
2map modulation constellation symbol, obtains modulation constellation symbol data
.In this example, according to constellation mapping table, the modulation constellation symbol of 01 correspondence is-1+i, and the modulation constellation symbol of 11 correspondences is 1+i, modulation constellation symbol data s=(-1+i, 1+i).
S105: the transmitting antenna selecting step S103 to obtain is launched the modulation constellation symbol data that step S104 obtains.In the emitting antenna combination selected, use v, 1≤v≤N
pindividual transmitting antenna sends symbol s
v, then sending signal can be expressed as
, wherein, ()
tthe transposition of representing matrix, sends signal x and has N
tindividual element, but only have N
pindividual nonzero value, and the index corresponding to transmitting antenna selecting activation in the combination of nonzero element position for mapping.What obtain in this example transmits as x=(-1+i, 0,0,1+i)
t.Transmission signal x is sent to receiver by transmitter.
Fig. 2 is a kind of embodiment schematic diagram of the present invention in conjunction with the generalized spatial modulation system receiver detection method of threshold judgement.As shown in Figure 2, the present invention comprises the following steps in conjunction with the generalized spatial modulation system receiver detection method of threshold judgement:
S201: carry out preliminary treatment to received signal:
The Received signal strength of receiver is designated as y, and y is N
rthe column vector of × 1, can be expressed as:
y＝Hx+n＝H
ks
k+n
Wherein N
rfor reception antenna quantity, H is the channel matrix of mimo system, and x is the transmission signal of generalized spatial modulation system transmitter, and n is average is 0, variance is σ
2additive white Gaussian noise, s
kthe modulation constellation symbol data sent under a kth emitting antenna combination selected by finger.
Y carries out preliminary treatment to received signal, obtains the preliminary equalizing signal z of Received signal strength.
Preliminary treatment can directly adopt the conjugate transpose of channel matrix to carry out preliminary treatment, also can adopt pseudoinverse preliminary treatment, as adopted channel column vectors or channel matrix to carry out pseudoinverse preliminary treatment, also can carry out preliminary treatment with the balanced matrix of the least mean-square error of channel matrix.In present embodiment, adopt channel matrix column vector to carry out pseudoinverse preliminary treatment, preliminary equalizing signal vector z is:
Wherein, h
j, j ∈ 1,2 ..., N
trepresent channel column vectors corresponding to jth transmit antennas,
the pseudo-inverse operation of representing matrix, and
()
hthe conjugate transpose of representing matrix, ()
tthe transposition of representing matrix.
S202: calculate emitting antenna combination possibility weights:
Select the transmitting antenna activated according to combination each in the emitting antenna combination mapping table that transmitter is preset, extract the new vectorial z of element composition corresponding in equalizing signal z
k, k ∈ 1,2 ..., N}, wherein N is the sum of emitting antenna combination in mapping table; According to z
kobtain the possibility weight w of respective transmit antenna combination
k.
Possibility weight w
ktwo kinds of methods can be adopted to obtain, and one calculates z
knot Luo Beini crow this norm or its square, i.e. w
k=|| z
k||
for
wherein || ||
fthis norm of not Luo Beini crow of representing matrix or vector; Another kind directly can calculate z
kin each element modulus value and sue for peace.
S203: emitting antenna combination is sorted: by possibility weight w
kfrom big to small emitting antenna combination is sorted, C
nrepresent the n-th emitting antenna combination after sequence;
S204: Initialize installation n=1.
S205: adopt balanced detection method to detect successively and obtain the rear n-th emitting antenna combination C of sequence
ncorresponding detection signal t
n, to detection signal t
ncarry out demodulation to obtain detecting constellation symbol data, constellation symbol data allocations will be detected to emitting antenna combination C
nin each antenna obtain detection of transmitted signals
Balanced detection method can adopt and allly be applicable to V-BLAST(Vertical-BellLabsLayeredSpace-Time, vertical-dblast time) the balanced detection algorithm of system.Adopt linear equalization detection method in present embodiment, comprise two kinds of algorithms most in use: ZF (ZeroForcing, ZF) algorithm and least mean-square error (MinimumMeanSquareError, MMSE) algorithm.
When adopting zero forcing algorithm, detection signal
wherein H
nrepresent the rear emitting antenna combination C of sequence
ncorresponding channel submatrix, ()
-1inverting of representing matrix.
When adopting least-mean-square error algorithm, detection of transmitted signals
wherein H
nrepresent the rear emitting antenna combination C of sequence
ncorresponding channel submatrix, I is N
p× N
punit matrix, ()
-1inverting of representing matrix.
Detection of transmitted signals
wherein Q () is demodulation function, and its effect is that equilibrium is detected the detection signal t obtained
ncarry out demodulation, detected constellation symbol data accordingly
constellation symbol data will be detected again
be assigned to emitting antenna combination C successively
non the position of transmitting antenna of lower activation, the relevant position of all the other transmitting antennas of mourning in silence is set to 0 simultaneously, thus obtains detection of transmitted signals
S206: judge detection of transmitted signals
whether reliable:
Decision threshold is V
theshold=N
rσ
2if,
then illustrate that this detection of transmitted signals is reliable, estimate to send signal
enter step S209; If unreliable, judge whether n < N, if n < is N, enter step S207, if n=N, enter step S208;
S207:n=n+1, the detection of transmitted signals returning step S205 corresponding to next emitting antenna combination judges.
S208: adopt maximum-likelihood criterion to select optimal detection to send signal from detection of transmitted signals corresponding to N number of emitting antenna combination and send signal as estimation, namely
The selection that optimal detection sends signal also can adopt maximum posteriori criterion.
S209: send signal according to estimation
corresponding emitting antenna combination and the mapping table of modulation constellation carry out demapping respectively, recover original binary bits information sequence.
Although be described the illustrative embodiment of the present invention above; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
Claims (8)
1., in conjunction with a generalized spatial modulation system receiver detection method for threshold judgement, it is characterized in that, comprise the following steps:
S1: the Received signal strength of receiver is N
rthe column vector y=Hx+n of × 1, wherein N
rfor reception antenna quantity, H is the channel matrix of mimo system, and x is the transmission signal of generalized spatial modulation system transmitter, and n is average is 0, variance is σ
2additive white Gaussian noise; Y carries out preliminary treatment to received signal, obtains the preliminary equalizing signal z of Received signal strength, preprocess method adopt in following three kinds of methods any one: adopt the conjugate transpose of channel matrix to carry out preliminary treatment; Channel matrix column vector or channel matrix is adopted to carry out pseudoinverse preliminary treatment; The balanced matrix of the least mean-square error of channel matrix is adopted to carry out preliminary treatment;
S2: select the transmitting antenna activated according to combination each in the emitting antenna combination mapping table preset, extracts the new vectorial z of element composition corresponding in preliminary equalizing signal z
k, k=1,2 ..., N, wherein N is the sum of emitting antenna combination in mapping table; According to z
kobtain the possibility weight w of respective transmit antenna combination
k;
S3: by possibility weight w
kfrom big to small emitting antenna combination is sorted, C
nrepresent the n-th emitting antenna combination after sequence;
S4: adopt balanced detection method to detect successively and obtain the rear n-th emitting antenna combination C of sequence
ncorresponding detection signal t
n, to detection signal t
ncarry out demodulation to obtain detecting constellation symbol data, constellation symbol data allocations will be detected to emitting antenna combination C
nin each antenna obtain detection of transmitted signals
judge detection of transmitted signals
whether reliable, decision threshold is V
theshold=N
rσ
2, once
wherein || ||
frepresent and ask for not this norm of Luo Beini crow, then estimate to send signal
enter step S5, otherwise continue to carry out detecting to an emitting antenna combination and judge; If all emitting antenna combination all cannot make
then from all detection of transmitted signals
middle selection optimal detection sends signal and sends signal as estimation
enter step S5;
S5: send signal according to estimation
corresponding emitting antenna combination and the mapping table of modulation constellation carry out demapping respectively, recover original binary bits information sequence.
2. generalized spatial modulation system receiver detection method according to claim 1, is characterized in that, the possibility weight w in described step S2
kfor z
knot Luo Beini crow this norm or its square.
3. generalized spatial modulation system receiver detection method according to claim 1, is characterized in that, the possibility weight w in described step S2
kfor z
kin the modulus value sum of each element.
4. generalized spatial modulation system receiver detection method according to claim 1, is characterized in that, the balanced detection method in described step S4 is linear equalization detection method.
5. generalized spatial modulation system receiver detection method according to claim 4, is characterized in that, described linear equalization detection method is zero forcing algorithm.
6. generalized spatial modulation system receiver detection method according to claim 4, is characterized in that, described linear equalization detection method is least-mean-square error algorithm.
7. according to the arbitrary described generalized spatial modulation system receiver detection method of claim 1 to 6, it is characterized in that, described optimal detection sends signal and adopts maximum-likelihood criterion to select.
8. according to the arbitrary described generalized spatial modulation system receiver detection method of claim 1 to 6, it is characterized in that, described optimal detection sends signal and adopts maximum posteriori criterion to select.
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| CN105162741B (en) * | 2015-09-10 | 2018-04-20 | 清华大学 | The detection method of receiving terminal in generalized space modulation communication system |
| CN106130615A (en) * | 2016-07-27 | 2016-11-16 | 南京理工大学 | The activation antenna of generalized spatial modulation system and modulation symbol combined estimation method |
| CN106877979A (en) * | 2017-02-27 | 2017-06-20 | 电子科技大学 | A kind of low complex degree detection method that single notation is modulated based on generalized space |
| CN109274410A (en) * | 2018-07-23 | 2019-01-25 | 华东交通大学 | A kind of generalized spatial modulation system and its modulator approach based on day line options |
| CN109286587B (en) * | 2018-11-01 | 2021-12-10 | 陕西齐腾电子科技有限公司 | Multi-active generalized spatial modulation detection method |
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