WO2013182167A1 - 一种球形译码检测方法及装置 - Google Patents
一种球形译码检测方法及装置 Download PDFInfo
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- WO2013182167A1 WO2013182167A1 PCT/CN2013/079929 CN2013079929W WO2013182167A1 WO 2013182167 A1 WO2013182167 A1 WO 2013182167A1 CN 2013079929 W CN2013079929 W CN 2013079929W WO 2013182167 A1 WO2013182167 A1 WO 2013182167A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
- H04L25/0246—Channel estimation channel estimation algorithms using matrix methods with factorisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- 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
- H04L25/00—Baseband systems
- 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
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
Definitions
- the present invention relates to the field of mobile communications, and in particular, to a ball decoding detection method and apparatus.
- MLD has the best performance, but the complexity is exponential and it is almost impossible to implement in hardware. While ZF and MMSE detection, although the calculation is simple, the bit error performance is rather poor, and the semi-determined slack detection has a lot of loss due to the conditional relaxation treatment on the basis of MLD.
- the SD detection has the error performance close to MLD and the complexity is moderate. It is an ideal signal detection method.
- Chinese Patent Application Publication No. CN200910084580.6 discloses a sphere decoding detection method based on depth-first search. Although the complexity of the algorithm has a good control, the maximum number of nodes that limit the tree search is M, resulting in a signal. There is a certain loss in performance.
- a depth-priority SD detection algorithm based on QR preprocessing is disclosed in the Chinese Patent Application Publication No. CN201010515931.7, which is only suitable for high SNR regions and low-order tuners. Signal detection for MIMO is not applicable for signal detection in low SNR regions. Summary of the invention
- Embodiments of the present invention provide a method and device for detecting a sphere decoding, which can reduce computational complexity without reducing bit error performance.
- one embodiment of the sphere decoding method for detecting the present embodiment of the invention comprising: pre-processing the received signal to obtain an approximate estimate of the signal of the received signal; ⁇ re, according to the; ⁇ re deriving spherical Decoding the initial square radius of detection/) 2 , determining the size of the constellation space according to the current signal to noise ratio of the received signal/;
- the search path After finding a search path, and finding the local Euclidean distance of the search path and less than the current square radius, updating the square radius, and using the received signal as the center of the sphere, the updated radius of the radius is a radius Within the multi-dimensional sphere, the search path is re-find until the search path is not found, and the candidate signal points corresponding to the newly saved search path are determined to be the optimal signal estimation points.
- the step of pre-processing the received signal to obtain an approximate estimated value 6 of the received signal includes:
- the received signal is processed by a semi-determined slack detector to obtain an approximate estimated value of the received signal; ⁇ re .
- the step of deriving the initial square radius / 2 of the sphere decoding detection according to the method includes:
- the step of determining the size of the constellation space according to the current signal to noise ratio of the received signal comprises:
- the step of searching for the search path according to the size of the constellation space and the initial square radius D 2 according to the depth-first and spherical constraint rules includes:
- Generating a child node of the current node, and calculating a node list, calculating a local Euclidean distance of the node of the A layer and a 3 ⁇ 4 ⁇ according to the priority order of the nodes in the node list; determining whether the local Euclidean distance of the node is greater than 4 2 , if the node's ⁇ ( ) ) is greater than 4 2 , then the node is cut, the ⁇ 1 layer is returned, and the searched child node is re-expanded; if the node's 3 ⁇ 4 ⁇ ) is not greater than 4 2 , At 1 o'clock, enter ⁇ 1 search, and when ⁇ ⁇ , find a search path, where 4 2 is a component of the vector.
- calculating a list of nodes including:
- the constellation nodes in the multi-dimensional sphere which are squared by the received signal are searched, and the constellation nodes in the multi-dimensional sphere are sorted according to the local Euclidean distance from small to large, and the node list corresponding to the constellation nodes in the multi-dimensional sphere is obtained.
- a ball decoding detecting device includes: a preprocessing unit, a square radius calculating unit, a constellation space size determining unit, and a path searching unit, where:
- the preprocessing unit to preprocess the received signal, to obtain an approximate estimate of the signal of the received signal; ⁇ re;
- the square radius calculation unit is configured to derive an initial square radius of the spherical decoding detection according to the x pre /) 2 ;
- the constellation space size determining unit is configured to determine a size of the constellation space according to a current signal to noise ratio of the received signal/;
- the path searching unit is configured to search for a search path according to a size of the constellation space/and an initial square radius/) 2 according to a depth-first and a spherical constraint rule, and the nodes through which the search path passes are all at an initial square radius In the sphere of the radius, after finding a search path, and finding the local Euclidean distance of the search path and less than the current square radius, updating the square radius, and updating the center of the received signal After the hypersphere has a radius radius of a multi-dimensional sphere, the search path is searched again until the search path is not found, and the candidate signal point corresponding to the newly saved search path is determined to be the optimal signal estimation point.
- the preprocessing unit performs preprocessing on the received signal to obtain the received signal.
- the signal approximation estimate x pre refers to processing the received signal through a semi-determined slack detector to obtain an approximate estimate of the received signal; ⁇ re .
- the constellation space size determining unit determines a size/finger of the constellation space according to a current signal to noise ratio of the received signal, and determines a size/value of the constellation space according to a current signal to noise ratio of the received signal. Big and powerful.
- the embodiments of the present invention have the following beneficial effects:
- the embodiment of the invention is a signal-to-noise ratio adaptive chirp signal detection method based on spherical decoding detection, which is preprocessed by a semi-deterministic relaxation detector to derive a tight initial square radius and a traversal order of the tree search.
- the smaller initial square radius can reduce the number of nodes accessed by the tree search, and start searching with the constellation grid point closest to the pre-detection signal, thereby accelerating the time for finding the optimal signal grid point in the tree search;
- the embodiments of the present invention have the characteristics of reducing system operation time, improving real-time processing capability of the system, reducing power consumption of the terminal device, and extending the standby time of the terminal.
- 1 is a system model of an embodiment of the present invention
- 2 is a flowchart of a method for detecting a sphere decoding according to an embodiment of the present invention
- FIG. 3 is a flowchart of searching for a search path in an implementation of an embodiment of the present invention.
- FIG. 4 is a diagram of a method for selecting a constellation space size under different signal to noise ratios in an implementation method of the present application
- FIG. 5 is a diagram showing error bit performance analysis of an implementation method according to an embodiment of the present invention
- FIG. 7 is a structural diagram of a sphere decoding detecting apparatus according to an embodiment of the present invention.
- the MIMO wireless communication system with 4 transmissions and 4 receptions is taken as an example to illustrate the principle of the method.
- the signal complex vector is a 4x1 transmit signal complex vector
- H is a 4x4 independent and identically distributed Rayleigh fading channel transfer matrix
- CN(0,1) is a complex Gaussian distribution with a mean of 0 variance
- the essence of SD detection is a tree-searching process, that is, performing constellation grid search in a tree, finding a shortest search path, and the vector corresponding to the value is the signal to be found. estimated value.
- the complexity of the existing detection methods is high, especially in the low SNR area, the complexity of the SD detection algorithm is quite large, and the hardware design is difficult to implement; or even if it can be designed on the hardware, the cost is large, and the real-time performance is better. Poor or power consumption is far away from a wide range of commercial applications.
- the method for detecting a sphere decoding in this embodiment includes:
- Step 201 The terminal device preprocesses the received signal Y by a suboptimal semi-deterministic slack detector to obtain a signal approximate estimated value X pre ;
- the implementation of the semi-determined relaxation detector is as follows:
- the detection of semi-determined relaxation is essentially the relaxation of the constraints on the basis of MLD, which is transformed into a semi-definite programming problem that can be solved in polynomial time, which is essentially a convex optimization problem.
- MLD is finally transformed into a convex optimization problem by semi-determined relaxation, it can be solved by the interior point method and has the complexity of polynomial.
- Pre-detection ensures that the search for the best signal point within the multi-dimensional sphere of the initial square radius that is set later will not fail.
- the semi-determined relaxation pre-detection has better bit error performance than the ZF and MMSE pre-detection, which can lead to a smaller radius, so that the unwanted signal points can be eliminated early. Find the best signal point you are looking for faster.
- the computational complexity of the semi-determined slack detection is constant, whether at low signal-to-noise ratio or high signal-to-noise ratio, whether low-order modulation or high-order modulation.
- ZF and MMSE have lower complexity in low-order modulation and high signal-to-noise ratio. If high-order modulation or low SNR is encountered, the complexity will increase rapidly.
- Step 203 The terminal device determines a finite constellation space size according to the current signal to noise ratio of the received signal Y.
- the distribution of the constellation grid points is as shown in FIG. Possible values for / are 9, 13, 21, 37, 55, 64.
- the values of I at different signal-to-noise ratios are corresponding according to the following table: SNR(dB) : 0 5 10 15 20 25 30
- the advantage of limiting the size of the search constellation is:
- the bit error performance and other sub-optimal detections are slightly different in low SNR.
- there are few really useful signal points then you can consider limiting the size of the constellation space, according to the signal-to-noise ratio.
- Differently adjust (reduce) the size of the constellation space which can greatly reduce the algorithm complexity of the corresponding signal to noise ratio range while maintaining the error performance.
- Depth-first means that in the process of performing a tree search, after finding a node that satisfies the condition at each level of the tree, it goes to the next layer to search, instead of continuing to find all the nodes that satisfy the condition in this layer.
- a spherical constraint is a node that cuts a tree that falls outside the sphere.
- the search path that satisfies the condition refers to the search path from the root node of the tree to the leaf node of the tree, and all the nodes that have passed must fall within the ball.
- the search order of the nodes on each layer of the tree is: Search in the order of the list of nodes.
- the calculation method of the node list Firstly, the constellation nodes falling in the multi-dimensional sphere with the received signal as the center and D 2 as the square radius are searched, and then the local Euclidean distances are sorted in ascending order, so that the constellation nodes of the preferential search can be obtained. List of nodes.
- a method for determining an optimal path according to a node list includes:
- Step 301 The terminal device generates a child node of the current node, and calculates a node list corresponding to the child nodes.
- Step 302 The terminal device calculates a local Euclidean distance and x ( ) of the node of the first layer (taken from the node list, starting from the priority level);
- Step 303 The terminal device determines whether ⁇ ,))> ⁇ 2 , if 3 ⁇ 4 ⁇ ))>4 2 , step 304 is performed; if 3 ⁇ 4 ⁇ )) is not greater than 4 2 , step 305 is performed;
- 4 2 is a component of the vector.
- Step 304 The terminal device cuts the node, returns to the previous layer, and re-extends the child node of the current node search, and performs step 301;
- Step 306 Go to the next level (-1) search
- Step 205 If the terminal device finds a complete search path, determines whether the local Euclidean distance is smaller than the current square radius, and if the local Euclidean distance is less than the current square radius, step 206 is performed; if the local Euclidean distance is not less than the current square radius, Go to step 207;
- Step 206 The terminal device updates the square radius, and the local Euclidean distance of the search path is used as the updated square radius.
- the optimal tree search path cannot find a complete search path after the last update radius, that is, the leaf node of the tree is not found, and step 207 is performed;
- Step 207 The terminal device selects the candidate corresponding to the newly saved search path. The signal point is used as the optimal signal estimation point, and the search is completed.
- Simulation environment Single-user, 4-to-four-receive MIMO communication system, channel estimation is ideal channel estimation, and channel state information is known at the receiving end, and the transmitter does not perform channel coding on the signal.
- the channel is a non-correlated flat Rayleigh fading channel.
- the SD-PRO signal detection method of the present embodiment performs bit error performance analysis and average complexity analysis with the existing SD detection and the conventional detection.
- the present embodiment substantially maintains the mismatch characteristic characteristic of the existing SD detection, that is, the performance loss is negligibly negligible.
- the SD detection method of the present embodiment has a smaller computational complexity, especially in the low SNR region, where the computational complexity is reduced.
- the embodiment further provides a sphere decoding detection apparatus, including: a preprocessing unit, a square radius calculation unit, a constellation space size determining unit, and a path searching unit, where: the preprocessing unit is set to be Receiving a signal for preprocessing, and obtaining an approximate estimated value re of the signal of the received signal;
- the square radius calculation unit is set to derive the initial square radius of the sphere decoding detection according to x pre
- a constellation space size determining unit configured to determine a size of the constellation space according to a current signal to noise ratio of the received signal /;
- a route search unit and is set to the depth-first sphere constraint rules, depending on the size / radius and the initial square space in the constellation /) 2 to find the search path, the search path through which the nodes are initially falls to the square of the radius of the sphere radius, After finding a search path, and finding the local Euclidean distance of the search path and less than the current square radius, updating the square radius, and in the multi-dimensional radius of the radius of the updated hypersphere In the ball, the search path is searched again until the search path is not found, and the candidate signal point corresponding to the newly saved search path is determined as the optimal signal estimation point.
- the pre-processing unit pre-processes the received signal to obtain an approximate estimated value X pre of the received signal, and processes the received signal through a semi-determined slack detector to obtain an approximate estimated value re of the received signal.
- the constellation space size determining unit determines the size of the constellation space according to the current signal-to-noise ratio of the received signal/Yes, and determines that the size/value of the constellation space increases as the current signal-to-noise ratio of the received signal becomes larger.
- the embodiment of the present invention is a signal-to-noise ratio adaptive chirp signal detection method based on spherical decoding detection, which is preprocessed by a semi-deterministic relaxation detector to derive a tight initial square radius and a tree search.
- the traversal order, the smaller initial square radius can reduce the number of nodes accessed by the tree search, and start the search with the constellation grid closest to the pre-detection signal, thus speeding up the time of finding the optimal signal grid in the tree search.
- adjust the search based on the difference in signal-to-noise ratio
- the number of constellation grid points effectively reduces the number of nodes accessed in the tree search while maintaining the signal quality (bit error performance) unchanged. Therefore, the embodiment of the present invention has the system operation time reduced and the system is improved.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2015548151A JP5934846B2 (ja) | 2012-12-24 | 2013-07-23 | 球面復号化検出方法及び装置 |
EP13801064.0A EP2924903B1 (en) | 2012-12-24 | 2013-07-23 | Sphere decoding detection method and device |
US14/654,601 US20150349923A1 (en) | 2012-12-24 | 2013-07-23 | Sphere Decoding Detection Method And Device |
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CN201210566917.9 | 2012-12-24 | ||
CN201210566917.9A CN103888217B (zh) | 2012-12-24 | 2012-12-24 | 一种球形译码检测方法及装置 |
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US (1) | US20150349923A1 (zh) |
EP (1) | EP2924903B1 (zh) |
JP (1) | JP5934846B2 (zh) |
CN (1) | CN103888217B (zh) |
WO (1) | WO2013182167A1 (zh) |
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CN104202127B (zh) * | 2014-09-25 | 2017-08-08 | 北京邮电大学 | 基于路径度量值的低复杂度mimo系统球译码信号检测方法 |
CN104734811B (zh) * | 2015-03-12 | 2018-02-06 | 苏州威发半导体有限公司 | 用于信号检测的软判决球形译码算法 |
CN106452686A (zh) * | 2016-08-24 | 2017-02-22 | 重庆大学 | 一种基于球形译码算法的半径更新方法和装置 |
WO2018078465A1 (en) | 2016-10-25 | 2018-05-03 | King Abdullah University Of Science And Technology | Efficient sphere detector algorithm for large antenna communication systems using graphic processor unit (gpu) hardware accelerators |
EP3614588B1 (en) * | 2017-05-02 | 2022-11-30 | LG Electronics Inc. | Method for performing mm-based noma communication and device therefor |
CN109039539B (zh) * | 2018-08-02 | 2021-08-24 | 深圳全志在线有限公司 | 候选星座点集合生成方法及mimo空间复用检测方法 |
CN109547077B (zh) * | 2019-01-22 | 2020-10-13 | 重庆京东方智慧电子系统有限公司 | 信号发送方法、信号接收方法、通信设备及存储介质 |
CN112260727B (zh) * | 2020-10-10 | 2022-06-24 | 上海擎昆信息科技有限公司 | 一种信号检测方法及装置、电子设备、可读存储介质 |
CN114389757A (zh) * | 2020-10-16 | 2022-04-22 | 南京中兴新软件有限责任公司 | 球形译码检测方法和装置、电子设备、存储介质 |
CN113114423B (zh) * | 2021-04-13 | 2022-06-24 | 东南大学 | 一种自适应球形译码检测方法 |
CN113438191B (zh) * | 2021-06-23 | 2023-06-30 | 安徽师范大学 | 一种sm-scma系统上行链路的零码字辅助球形译码方法、系统 |
CN115333583B (zh) * | 2022-08-10 | 2024-02-06 | 比科奇微电子(杭州)有限公司 | 多发多收通信系统的信号检测方法及装置 |
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- 2013-07-23 US US14/654,601 patent/US20150349923A1/en not_active Abandoned
- 2013-07-23 WO PCT/CN2013/079929 patent/WO2013182167A1/zh active Application Filing
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EP2924903A4 (en) | 2015-11-11 |
CN103888217B (zh) | 2017-11-14 |
JP2016503986A (ja) | 2016-02-08 |
JP5934846B2 (ja) | 2016-06-15 |
EP2924903A1 (en) | 2015-09-30 |
US20150349923A1 (en) | 2015-12-03 |
EP2924903B1 (en) | 2018-11-28 |
CN103888217A (zh) | 2014-06-25 |
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