CN109672644A - Multistage multiple-input and multiple-output detector and its method for detecting - Google Patents
Multistage multiple-input and multiple-output detector and its method for detecting Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—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
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03203—Trellis search techniques
- H04L25/03242—Methods involving sphere decoding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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Abstract
This application involves multistage multiple-input and multiple-output detector and its method for detecting, multistage multiple-input and multiple-output detector includes: one first multiple-input and multiple-output detecting module, carries out one first multiple-input and multiple-output to an input signal and detects operation；One second multiple-input and multiple-output detecting module is serially connected with the first multiple-input and multiple-output detecting module, carries out one second multiple-input and multiple-output to the input signal and detects operation；And a control module, the second multiple-input and multiple-output detecting module is coupled, controls whether the second multiple-input and multiple-output detecting module operates.The complexity of the first multiple-input and multiple-output detecting module is less than or equal to the complexity of the second multiple-input and multiple-output detecting module.
Description
Technical field
The present invention relates to multiple-input and multiple-output (Multiple-Input Multiple-Output, hereinafter referred to as MIMO)
Technology, especially with respect to MIMO detector and MIMO method for detecting.
Background technique
MIMO technology uses antenna array receiving and transmitting signal, can increase the capacity of channel under existing frequency spectrum resource, support
The decaying of signal caused by anti-multi-path, and increase communication covering scope.Current wireless communication standard, such as wireless office
IEEE 802.11n used in the network of domain (or 11ac, 11ax ...), global intercommunication microwave access (Worldwide
Interoperability for MicrowaveAccess, WiMax) used in IEEE 802.16 and third generation action
The long evolving system (Long Term Evolution, LTE) that Telecommunication Union is proposed all is passed using MIMO technology with improving
Defeated handling capacity (throughput).On the other hand, high-dimensional quadrature amplitude modulation (Quadrature Amplitude
Modulation, hereinafter referred to as QAM) mechanism is also widely used in above-mentioned wireless communication standard.
In general, MIMO method for detecting includes linear and nonlinear method for detecting.Linear MIMO method for detecting
It is calculated comprising force zero (Zero-Forcing, ZF) algorithm and least mean-square error (minimum mean-square error, MMSE)
Method.(Vertical Bell when nonlinear MIMO method for detecting includes rectilinear dblast
Laboratories Layered Space Time, V-BLAST) algorithm, maximum similarity (Maximum Likelihood,
ML) algorithm and hybrid sphere decoding (Sphere Decoding, SD) algorithm.The efficiency of nonlinear method for detecting is more linear to detect
Survey method is high, but complexity is also higher, especially when the dimension of QAM is higher, the complexity of nonlinear method for detecting is higher,
Size needed for circuit is bigger, power consumption is bigger.
The preparer for being common in wireless communication system is formed with: two phase offsets modulate (binaryphase-shift
Keying, BPSK), four phase offsets modulation (quadrature phase-shift keying, QPSK) and QAM mechanism (packet
Containing 16-QAM, 64-QAM, 256-QAM and 1024-QAM etc.) etc..It can be seen that the design of MIMO detector becomes increasingly
Complexity, thus need applicable a variety of different modulation schemes MIMO detector.
Summary of the invention
In view of the deficiency of prior art, a purpose of the present invention is that providing a kind of detecting side MIMO for being used for a receiving end
Method and relevant MIMO detector, to be applicable in a variety of different modulation schemes.
The invention discloses a kind of multistage MIMO detectors, include: one the oneth MIMO detecting module, carry out to an input signal
One the oneth MIMO detects operation；One the 2nd MIMO detecting module, is serially connected with the first MIMO detecting module, to the input signal into
The 2nd MIMO of row 1 detects operation；And a control module, the 2nd MIMO detecting module is coupled, the 2nd MIMO detecting is controlled
Whether module operates.The complexity of first MIMO detecting module is less than or equal to the complexity of the 2nd MIMO detecting module.
The present invention separately discloses a kind of multistage MIMO detector, which supports QAM mechanism, and highest is supported to M-
QAM, M are the integer greater than 1.The MIMO detector includes one the oneth MIMO detecting module and one the 2nd MIMO detecting module.
First MIMO detecting module carries out one the oneth MIMO to an input signal and detects operation, and the first MIMO detecting module is supported
M-QAM.2nd MIMO detecting module is serially connected with the first MIMO detecting module, carries out one the 2nd MIMO to the input signal and detects
Survey operation.2nd MIMO detecting module supports that N-QAM, N are the integer greater than 1, and N is less than M.First MIMO detects operation
Complexity detects the complexity of operation less than or equal to the 2nd MIMO, and the modulation scheme includes the M-QAM and N-QAM.
The present invention separately discloses a kind of multistage MIMO method for detecting, is applied to a MIMO wireless device, the MIMO wireless device
Receive an input signal.This method includes: carrying out one the oneth MIMO to the input signal and detects operation；And according to one with reference to letter
Breath decides whether to carry out the input signal one the 2nd MIMO detecting operation.The complexity of first MIMO detecting operation is lower than
Or the complexity equal to the 2nd MIMO detecting operation.The reference information is selected to be searched by a log likelihood ratio Distribution value, one
One signal of tree-pruning ratio, the number of constellation candidate with limited distance, a channel matrix conditional number, the input signal
Noise than, a bit error rate of a packet error of the input signal, the input signal, the input signal one modulation and
The group that the antenna number of coding strategy, a constellation size of the input signal and the MIMO wireless device is constituted.
MIMO is executed using at least two stages and detects operation, and multistage MIMO detector of the invention and its method for detecting are being grasped
It is more flexible on work.Compared to known techniques, the present invention efficiently reduces required circuit size and efficiently controls power
Consumption.
Feature, implementation and effect for the present invention, hereby schema being cooperated to make embodiment, detailed description are as follows.
Detailed description of the invention
[Fig. 1] is the functional block diagram of MIMO wireless device of the present invention；
[Fig. 2] is the functional block diagram of an embodiment of logic circuit 122 of the invention；
[Fig. 3] is the flow chart of an embodiment of MIMO method for detecting of the invention；
[Fig. 4] is the thin portion process of the step S340 of Fig. 3；And
[Fig. 5] is the thin portion process of the step S430 of Fig. 4.
Symbol description
100 MIMO wireless devices
110 analog front circuits
120 digital circuits
122 logic circuits
124 memories
130 antennas
210 FFT modules
220 channel estimators
230 multistage MIMO detectors
232,234 MIMO detecting module
236 control modules
240 decoders
S310~S340, S410~S460, S431~S436 step.
Specific embodiment
The technical terms of following description are the idiom referring to the art, if this specification is to part term
It is illustrated or defines, the explanation or definition of this specification are subject in the explanation of the part term.
Disclosure of the invention includes multistage MIMO detector and its method for detecting.Since multistage MIMO of the invention is detectd
Survey the device members that include it is independent for may be known tip assemblies, therefore do not influence the device inventions it is abundant disclose and
Under the premise of exploitativeness, illustrate that memorandum will be given for the details of known tip assemblies below.
Fig. 1 is the functional block diagram of MIMO wireless device of the present invention.MIMO wireless device 100 includes analog front circuit
110 and digital circuit 120.The radiofrequency signal of simulation is connect by k antenna (130-1~130-k, k are the integer more than or equal to 2)
After receipts, via the processing of analog front circuit 110, (depending on different applications, analog front circuit 110 may include the one of following operation
Part or all of: frequency reducing, amplification, filtering, sampling, Analog-digital Converter etc., but not limited to this) and generate digital input
Signal Din.120 couples of digital circuit digital input signal Din are handled to obtain the input signal Din of number and be taken later
The data-signal of band.Digital circuit 120 includes that (or the equivalent device with program executive capability such as is handled logic circuit 122
Unit, microprocessor, microcontroller etc.) and memory 124.Memory 124 stores the program code executed for logic circuit 122
And/or program instruction.The digital circuit 120 carries out relevant logical operation according to a reference frequency.
According to the thin portion function of logic circuit 122, logic circuit 122 can be divided into a plurality of functional modules, and Fig. 2 is
The functional block diagram of one embodiment of logic circuit 122 of the invention.The input signal Din of number is via k fast Flourier
Conversion (Fast Fourier Transform, FFT) module 210-1~210-k is converted to frequency domain, by multistage MIMO detector
230 couples of digital input signal Din are detected, to obtain corresponding to a plurality of logarithm phases of the input signal Din of those numbers
Like ratio (Log-likelihood ratio, hereinafter referred to as LLR), wherein the numerical value of LLR be cured higher position represent correct probability (can
By degree) it is higher.According to LLR, decoder 240 can decode data-signal entrained by the input signal Din of number.Channel is estimated
The transmission channel of radiofrequency signal can be estimated according to the input signal Din of number by surveying device 220, and generate channel quality letter
Cease CI.Other than control module 236, multistage MIMO detector 230 includes the MIMO detecting module of two ranks or two ranks or more.Figure
In 2 embodiment by taking two ranks as an example, the first rank is MIMO detecting module 232, and second-order is MIMO detecting module 234, and MIMO
Detecting module 234 is serially connected with after MIMO detecting module 232.In the present embodiment, MIMO detecting module 232 and MIMO detect mould
Information (such as channel quality information CI) needed for block 234 can be provided by control module 236, and in other embodiments,
The two can be not through control module 236 and obtain required information.In some embodiments, which answers
Miscellaneous degree is lower than the complexity of the MIMO detecting module 234.In the above-described embodiments, which detects with the MIMO
Survey module 234 can be respectively a linear MIMO detecting module (such as: force zero (ZF) or least mean-square error (MMSE) detecting mould
Block) and a Nonlinear M IMO detecting module (such as: hybrid sphere decoding (SD) detecting module).Or, the MIMO detecting module 232 with
The MIMO detecting module 234 can also all be non-linear MIMO detecting module.In other embodiments, the MIMO detecting module
232 with the MIMO detecting module 234 be identical MIMO detecting module, in this embodiment, which answers
Miscellaneous degree is equal to the complexity of the MIMO detecting module 234.Such as: the MIMO detecting module 232 and the MIMO detecting module 234 are all
For hybrid sphere decoding (SD) detecting module, but the short-list of the MIMO detecting module 232 and the MIMO detecting module 234 not phase
Together, that is, handled constellation point (constellation point) is different.
Fig. 3 is the flow chart of an embodiment of MIMO method for detecting of the invention.Please refer to Fig. 2 and Fig. 3 to understand
The details of operation of multistage MIMO detector 230.The digital input letter of 232 pairs of MIMO detecting module of multistage MIMO detector 230
Number Din carries out the low MIMO of complexity and detects operation (step S310), to generate a detecting result.This detecting result can transmit
To MIMO detecting module 234 and/or control module 236.Then, control module 236 decides whether the input signal Din to number
It carries out the high MIMO of complexity and detects operation (step S320).When the judging result of step S320 is no, the control of control module 236
MIMO detecting module 234 is inoperative, makes the detecting result of multistage MIMO detector 230 directly output MIMO detecting module 232 (also
That is the detecting result of the low MIMO detecting operation of complexity) (step S330).In detail, in step S330, multistage MIMO is detectd
The high MIMO detecting operation of complexity will not be carried out to digital input signal Din by surveying device 230, can so reduce digital circuit
120 processing time and power consumption.When the judging result of step S320 be it is yes, control module 236 control MIMO detecting module 234 it is right
The input signal Din of number carries out the high MIMO of complexity and detects operation (step S340).
Referring to Fig. 4, Fig. 4 is the thin portion process of the step S340 of Fig. 3.When the high MIMO of progress complexity detects operation,
The detecting result (can be described as " the first rank LLR ") of MIMO detecting module 234 using MIMO detecting module 232 is high as complexity
MIMO detects the central point (step S410) of the search area (search range) of operation, and according to channel estimator 220
Generated channel quality information CI (such as providing through control module 236, but not limited to this) determines searching for search area
Radius R (step S420) is sought, a short-list is then determined with the central point and search radius R, and to being located at the time
The constellation point in list is selected to execute the algorithm (step S430) of the high MIMO detecting of complexity.In this way, which complexity is high
MIMO detecting operation can find out more preferably constellation point in limited range.Complexity is carried out compared to whole constellation points
High MIMO detects operation, and step S410~S430 can reduce the computational complexity of the high MIMO detecting operation of complexity, because
This reduces the whole energy consumption of circuit.
Please continue to refer to Fig. 4.When MIMO detecting module 234 executes the algorithm of the high MIMO detecting of complexity, mould is controlled
Whether block 236 monitors MIMO detecting module 234 in preset time T completion operation (step S440).When operation is not yet completed and is gone back
Preset time T is not reached, then returns to step S430 and continues operation.When having not arrived preset time T and MIMO detecting module
234 operations are completed and generate detecting result (can be described as " second-order LLR "), then multistage MIMO detector 230 exports complexity
The detecting result (step S450) of high MIMO detecting operation.When being more than that preset time T and operation are not yet completed, then control module
236 runnings for interrupting MIMO detecting modules 234 (though at this point, MIMO detecting module 234 is interrupted, but still generate a detecting result
(can be described as " second-order LLR ' "), the numerical value of second-order LLR ' can between the first rank LLR and second-order LLR, it is,
First rank LLR < second-order LLR ' < second-order LLR), and control multistage MIMO detector 230 and export MIMO detecting module
234 detecting results (second-order LLR ') (step S460) obtained when being interrupted.In order to ensure multistage MIMO detector 230
The overall operation time meets the timing of MIMO wireless device 100, this preset time T can be designed as being less than or equal to MIMO detecting mould
The time interval of continuous two detecting results of block 232, or the execution cycle less than or equal to next stage circuit.When next stage electricity
When road is decoder 240, multistage MIMO detector 230 need to provide new LLR in each execution cycle of decoder 240 with true
Protecting decoder 240 can be decoded.In one embodiment, which is that (include: multistage MIMO is detectd the digital circuit 120
Survey device 230, decoder 240) reference frequency period plural number times.
In another embodiment, MIMO detecting module 234 being designed to, another two-stage is detected.In this embodiment,
Step S430 can be divided into the following steps (as shown in Figure 5) again.Firstly, will first be located in the short-list in step S430
Constellation point divides into the constellation point and the constellation point (step S431) of short-list again of first short-list, wherein first to wait
The constellation point number of list is selected to be less than the number of the constellation point in the short-list.The MIMO detecting module 234 is first first for this
The constellation point of secondary short-list carries out MIMO detecting and obtains corresponding detecting result (indicating it with LLR ") (step S432).
Compare the detecting result LLR " and a preset critical (step S433), if the numerical value of detecting result LLR " is pre- more than or equal to this
If critical value, then the MIMO detecting module 234 exports the detecting result LLR " and is used as second-order LLR (step S434)；If should
The numerical value of detecting result LLR " be less than the preset critical, then again for this again short-list constellation point carry out MIMO detecting
And obtain corresponding detecting result (with LLR " ' indicate it) (step S435).The MIMO detecting module 234 selects detecting result
The greater of LLR " (result of step S432) and detecting result LLR " ' (result of step S435) are as second-order LLR
Output (step S436).In this way, just completing the high MIMO detecting of two (more) rank complexities.
Certainly, the considerations of decision of first short-list can be according to the feasibility, convenience and cost of circuit design is different
And there is its a variety of deciding means.One embodiment, the MIMO detecting module 234 are first searched according to what is determined in step S420
It seeks radius R and determines the first radius R1, wherein R1 is less than R.Wherein, during MIMO detecting module 234 is obtained with step S410
It is obtained for search radius to determine the first short-list, and with step S410 centered on heart point with the first radius R1
Central point centered on the search radius R that is determined with step S420, and deduct the first short-list and determine this
Short-list again.Certainly, when the execution cycle of the high second order MIMO detecting module 234 of above-mentioned complexity is preset no more than this
Between T.
Return to Fig. 3, in step s 320, control module 236 according to multistage MIMO detector 230 inner parameter and/or
External parameter determines whether MIMO detecting module 234 operates.When MIMO detecting module 234 is inoperative, multistage MIMO detector
The detecting result of 230 directly output MIMO detecting modules 232 (can be also bypassed depending on MIMO detecting module 234
(bypassed) it or is disabled (disabled)).When MIMO detecting module 234 operates, multistage MIMO detector 230 is exported
The detecting result of MIMO detecting module 234 (detailed process is as shown in Figure 4).That is, multistage MIMO detector of the invention
230 are designed as inherently making the running of MIMO detecting module 232, and (that is, the present invention inherently executes complexity when executing the detecting of MIMO
Spend low MIMO detecting operation), and selectively transport MIMO detecting module 234 according to inner parameter and/or external parameter
Make (that is, the present invention executes and selectively executes complexity high MIMO detecting operation when the detecting of MIMO).This design can regard
A kind of for multistage MIMO detector 230 stops (early terminate) mechanism in advance, can avoid MIMO wireless device 100
It puts into resource (such as time, electric power) but cannot get better result.Abort mechanism helps to improve MIMO without traditional thread binding in advance
Set 100 efficiency.Above-mentioned inner parameter is the information from the multistage MIMO detector 230, and above-mentioned external parameter is non-
Information from the multistage MIMO detector 230.
Above-mentioned inner parameter can be to be detectd according to caused by the multistage MIMO detector 230 of preceding several symbols (symbol)
It surveys as a result, such as LLR distribution, search tree-pruning ratio (Tree pruning ratio) and/or the constellation with limited distance
The number of candidate (constellation candidates with bounded distance).Above-mentioned inner parameter is also
It may include preset time T used in aforementioned step S440, it can be ensured that multistage MIMO detector 230 is defeated in preset time T
Its detecting result (can be obtained most probable solution in finite time) out.Above-mentioned external parameter includes the item of channel matrix
Signal noise ratio (the signal-to-noise of number of packages (condition number of channel matrix), input signal
Power ratio, SNR), the packet error (packet error rate, PER) of input signal, the bit of input signal it is wrong
Accidentally rate (bit error rate, BER), the modulation of input signal and coding strategy (modulation and coding
Scheme, MCS), the constellation size (constellation size) of input signal and the antenna number of MIMO wireless device 100
At least one of (that is, k value above-mentioned).
By taking modulation and coding strategy (MCS) as an example, when the dimension of the QAM mechanism of the input signal Din of number is higher, then phase
Constellation (constellation) coordinate is closeer over the ground.That is, increasing in the case where the average energy of planisphere remains unchanged
Add constellation point, the distance between constellation point can be made to become smaller.Inventor observes, when transmission symbol (symbol) channel quality very
In the case of good, the numerical value of the detecting result (the first rank LLR) of the MIMO detecting module 232 is very high, and it is correct to represent it
Probability (reliability) it is very high.Therefore in the case of channel quality is fine, the efficiency of the MIMO detecting module 232 and the MIMO
The efficiency of the series connection of the detecting module 232 MIMO detecting module 234 is approximate.When channel quality better when, then the modulation and coding plan
Slightly transfer rate used in (MCS) is higher (that is, the dimension of QAM mechanism also can be higher).In other words, when QAM mechanism
Dimension it is high in the case of, just represent the good situation of the channel quality.Further, since the dimension when QAM mechanism is cured Gao Ze
The complexity of calculating is just higher, size needed for circuit is just bigger, power consumption is just bigger.So in some embodiments, it will
MIMO detecting module 234 the dimension of supported highest QAM mechanism be designed as standardizing and need to supporting most lower than relevant criterion
The dimension of high QAM mechanism, that is, for example MIMO wireless device 100 supports M-QAM, MIMO detecting module 234 to be designed to not prop up
M-QAM is held, M is the integer greater than 1.For example, the highest dimension that 802.11ax standard need to be supported is 1024-
The circuit design of MIMO detecting module 234 can be then that only supported highest dimension is 256-QAM or 64-QAM by QAM.Change speech
It, control module 236 as control condition, is determined entire more with the modulation of the input signal Din of number and coding strategy (MCS)
The operating mechanism of rank MIMO detector 230.Separately for example, when modulation and coding strategy are more than or equal to 1024-QAM or 256-
When QAM, the detecting result of the low MIMO detecting module 232 of complexity is used only as output in multistage MIMO detector 230；Work as tune
When system and coding strategy are less than 1024-QAM or 256-QAM, multistage MIMO detector 230 is connected using MIMO detecting module 232
The detecting result of the MIMO detecting module 234 is as output.So design can not only efficiently reduce required circuit size
And power consumption is efficiently controlled, and its efficiency is just slightly below the high MIMO detecting operation of traditional complexity.
In various embodiments, the component that Fig. 2 is included can be with hardware (such as circuit), software and/or firmware
Mode implementation.Present invention can apply to wireless and wired MIMO devices.
It is taken off in icon before note that, shape, size, ratio and sequence of step of component etc. are only to illustrate, for this skill
Art field tool usually intellectual understands the present invention and is used, non-to limit the present invention.Although the embodiment of the present invention institute as above
It states, however those embodiments are not used to limit the present invention, the art has usually intellectual can according to the present invention bright
The content shown or implied imposes variation to technical characteristic of the invention, all this kind variation may belong to sought by the present invention
Patent protection scope, in other words, scope of patent protection of the invention must regard subject to the those as defined in claim of this specification.
Claims (10)
1. a kind of multistage multiple-input and multiple-output detector, includes:
One first multiple-input and multiple-output detecting module carries out one first multiple-input and multiple-output to an input signal and detects operation；
One second multiple-input and multiple-output detecting module is serially connected with the first multiple-input and multiple-output detecting module, to the input signal
Carry out one second multiple-input and multiple-output detecting operation, wherein the complexity of the first multiple-input and multiple-output detecting module be lower than or
Equal to the complexity of the second multiple-input and multiple-output detecting module；And
One control module couples the second multiple-input and multiple-output detecting module, controls the second multiple-input and multiple-output detecting module
Whether operate.
2. multistage multiple-input and multiple-output detector as described in claim 1, wherein the control module is according to corresponding at least one
A first information caused by the multistage multiple-input and multiple-output detector of preceding symbol controls second multiple-input and multiple-output detecting
Whether module operates.
3. multistage multiple-input and multiple-output detector as claimed in claim 2, wherein the first information includes that a logarithm is similar
Than at least one for the number that Distribution value, one search tree-pruning ratio and the constellation candidate with limited distance.
4. multistage multiple-input and multiple-output detector as described in claim 1, wherein the multistage multiple-input and multiple-output detector is answered
For a wireless device, and the control module comes from one second letter caused by the multistage multiple-input and multiple-output detector according to non-
Breath controls whether the second multiple-input and multiple-output detecting module operates；Wherein, which includes a channel matrix condition
One bit-errors of number, a signal noise ratio of the input signal, a packet error of the input signal, the input signal
A modulation and coding strategy, a constellation size of the input signal and the antenna number of the wireless device for rate, the input signal
At least one.
5. multistage multiple-input and multiple-output detector as described in claim 1, the wherein multistage multiple-input and multiple-output detector branch
1024- quadrature amplitude modulation mechanism is held, when a modulation scheme of the input signal is 1024-QAM, control module control should
Second multiple-input and multiple-output detecting module is inoperative.
6. multistage multiple-input and multiple-output detector as described in claim 1, the wherein multistage multiple-input and multiple-output detector branch
Hold 256- quadrature amplitude modulation mechanism, when a modulation scheme of the input signal is 256-QAM, the control module control this
Two multiple-input and multiple-output detecting modules are inoperative.
7. multistage multiple-input and multiple-output detector as described in claim 1, wherein the multistage multiple-input and multiple-output detector is most
Height supports that M-QAM, the second multiple-input and multiple-output detecting module does not support that M-QAM, M are the integer greater than 1.
8. multistage multiple-input and multiple-output detector as described in claim 1, wherein the second multiple-input and multiple-output detecting module
For a nonlinear multiple-input and multiple-output detecting module, and the first multiple-input and multiple-output detecting module is that a linear multi input is more
Export detecting module or nonlinear multiple-input and multiple-output detecting module.
9. a kind of multistage multiple-input and multiple-output detector, which supports quadrature amplitude modulation mechanism, and
Highest supports that M-QAM, M be the integer greater than 1, which includes:
One first multiple-input and multiple-output detecting module carries out one first multiple-input and multiple-output to an input signal and detects operation, should
First multiple-input and multiple-output detecting module supports M-QAM；
One second multiple-input and multiple-output detecting module is serially connected with the first multiple-input and multiple-output detecting module, to the input signal
Carry out the detecting operation of one second multiple-input and multiple-output, wherein the second multiple-input and multiple-output detecting module supports N-QAM, and N is big
In 1 integer, and N is less than M；
Wherein, the complexity of the first multiple-input and multiple-output detecting operation detects operation less than or equal to second multiple-input and multiple-output
Complexity, and the quadrature amplitude modulation mechanism include the M-QAM and N-QAM.
10. a kind of multistage multiple-input and multiple-output method for detecting, is applied to a MIMO radio device, how defeated the multi input is
Wireless device receives an input signal out, and this method includes:
One first multiple-input and multiple-output is carried out to the input signal and detects operation；And
According to a reference information, decide whether to carry out the input signal detecting operation of one second multiple-input and multiple-output；
Wherein, the complexity of first multiple-input and multiple-output detecting operation is less than or equal to second multiple-input and multiple-output detecting fortune
The complexity of calculation；
Wherein, which, which is selected from, searches tree-pruning ratio, with limited distance by a log likelihood ratio Distribution value, one
One package of the number of constellation candidate, a channel matrix conditional number, a signal noise ratio of the input signal, the input signal
Error rate, a bit error rate of the input signal, a modulation of the input signal and a star of coding strategy, the input signal
The group that seat size and the antenna number of the MIMO radio device are constituted.
Priority Applications (1)
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