CN107197500A - A kind of relay node selecting method for spatial modulation decode-and-forward relay system - Google Patents
A kind of relay node selecting method for spatial modulation decode-and-forward relay system Download PDFInfo
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- CN107197500A CN107197500A CN201710533308.6A CN201710533308A CN107197500A CN 107197500 A CN107197500 A CN 107197500A CN 201710533308 A CN201710533308 A CN 201710533308A CN 107197500 A CN107197500 A CN 107197500A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
The invention belongs to Communication Anti-Jamming Techniques field, a kind of relay node selecting method of spatial modulation decode-and-forward relay system is particularly related to.Relay node selecting method of the present invention is mainly that the planisphere for receiving signal from source node by via node estimates that the via node correctly demodulates the probability of source node identification, and the via node group being activated is selected from there through back haul link.Beneficial effects of the present invention are, the invention provides a kind of relay node selecting method for the spatial modulation decode-and-forward relay system that probability is correctly demodulated based on via node, the technology from several via nodes by choosing a subset, it is used as the via node of decoding forwarding information, the node for selecting correct demodulation source node identification maximum probability can be made to carry out relay forwarding, make system in the case where introducing the complexity of less feedback quantity and increase very little, the BER performances of system is significantly improved.
Description
Technical field
The invention belongs to Communication Anti-Jamming Techniques field, it is related to spatial modulation (Spatial Modulation, SM) technology,
Relaying technique (Relaying technology), orthogonal amplitude (Quadrature Amplitude Modulation, QAM) is adjusted
Technology processed, and its related MIMO (Multiple Input Multiple Output) technology.
Background technology
MIMO modulation techniques are the high speed transmission technologies under a kind of wireless environment, and it is configured in transmitting terminal and/or receiving terminal
More antenna elements, and advanced Space Time Coding modulation scheme is combined, can band by being made full use of to spatial degrees of freedom
Come extra diversity, multiplexing and beam forming gain.
Recently, SM technologies are proposed as a kind of new modulation technique as a kind of new MIMO modulation schemes.The skill
The general principle of art is, by activating different antennas, antenna index value to be modulated for transmission information bit.This transmission side
The essence of case is the independence for utilizing different channels in mimo system.Because an only antenna is activated every time, and then in hair
Penetrate end and only need to a radio frequency unit and this process energy hop bit, so this approach increases transmission rate, and drop
The low cost and complexity of mimo system.
However, work as reception antenna number seldom, or even when only one, can be because lacking spatial degrees of freedom, and lead
Performance is caused to be remarkably decreased.A kind of spatial modulation decode-and-forward relay for being combined relaying technique and space-modulation technique
(Spatial Modulation with Multiple Decode and Forward Relays, SM-DF-Relay) system,
This problem is solved well, and this causes this system to be preferably applied to the downlink of radio communication.
However, it is there is also some defects, the communication process of SM-DF relay systems requires that multiple via nodes are joined simultaneously
With, the BER performances of receiving terminal are improved it is necessary to increase the number of via node, and this just necessarily causes the serious wasting of resources, plus
The burden of weight via node, meanwhile, it can also make the detection complexity of receiving terminal with via node number linear increase.
The content of the invention
The purpose of the present invention, there is provided a kind of trunk node selection for the wasting of resources caused aiming at multiple via nodes
Method.
Technical scheme：A kind of spatial modulation decode-and-forward relay system that probability is correctly demodulated based on via node
The relay node selecting method of system, it is characterised in that comprise the following steps：
A. in SM-DF-Relay system model,Represent source node to the channel matrix of i-th of via node, meter
The minimum Eustachian distance d of the point in the source node signal constellation (in digital modulation) figure that each via node is received is calculated, that is, obtains source node warp
Via node i is crossed to the compound channel of destination node：
Wherein NtFor source node transmitting antenna number；
B. being chosen from all alternative via node subsets makes dmin(H) maximum via node subset, i.e.,
Wherein, SetIRepresent the set of all alternative via node subset compositions.
Beneficial effects of the present invention are that the invention provides a kind of spatial modulation that probability is correctly demodulated based on via node
The relay node selecting method of decode-and-forward relay system, the technology by choosing a subset from several via nodes,
As the via node of decoding forwarding information, it can make to select in the correct node progress for demodulating source node identification maximum probability
After forwarding, make system in the case where introducing the complexity of less feedback quantity and increase very little, obtaining the BER performances of system
To significant raising.
Brief description of the drawings
Fig. 1 is traditional SM system block diagrams.
Fig. 2 is spatial modulation decode-and-forward relay system block diagram.
Fig. 3 is spatial modulation decode-and-forward relay system trunk node selection system block diagram proposed by the present invention.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings
The embodiment to the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that, in the following description, when known function and design detailed description perhaps
When can desalinate the main contents of the present invention, these descriptions are said herein to be ignored.
For preferably the present invention will be described, the term used in technical solution of the present invention and spatial modulation system are first introduced
System transmitter architecture.
Spatial modulation：Such as Fig. 1, b is the bit data for needing to transmit, and can be considered as L × T matrix, wherein L=
Log2 (M)+log2 (Mary) is the amount of bits entrained by a SM modulation symbol, and Mary is quadrature amplitude modulation
(Quadrature Amplitude Modulation, QAM) exponent number.As can be seen that the ratio that a SM modulation symbol is carried by
Special quantity is together decided on by QAM modulation exponent number and number of transmission antennas.SM modulation criterions are to be transformed into b according to SM translation tables
One M × T matrix x.In x, a row represent the data sent at a moment, any one row only one of which non-zero, meaning
Taste any time and only has an antenna to send data.
Such as Fig. 2, spatial modulation decode-and-forward relay system model includes an information source node, and the source node is equipped with NtRoot
Transmitting antenna, L via node, each via node is equipped with a transmitting antenna, and a destination node.
One collaboration communication process of the system includes two time slots：
(1) first time slot (broadcast phase)：Information source node is by log2(MNt) individual bit information by SM modulate, broadcast
Via node and destination node are sent to, wherein, M is the order of modulation of QAM/PSK symbols, connecing at l-th of via node
The collection of letters number can be expressed as form：
Wherein,For the white Gaussian noise at l-th of via node,The transmitting antenna being activated and l-th of relaying
Channel information between node.Similarly, the reception signal at destination node is expressed as：
ys,d=hsd,jx+ns,d, j ∈ { 1 ..., Nt}
Wherein, ns,dFor the white Gaussian noise at destination node, hsd,jBetween the transmitting antenna and destination node that are activated
Channel information, the signal that via node demodulation is received, and demodulation result is verified；
(2) second time slots (decoding forwarding stage)：It is correct to demodulate the via node for receiving signal, signal will be received and arrived
Be transmitted to destination node.It is assumed here that an ideal situation, i.e. receiver at via node can pass through cyclic redundancy
Verification (Cyclic Redundancy Check, CRC) accurately determines whether the signal oneself detected is correct.In target section
The signal of l-th of via node forwarding received at point can be expressed as：
Wherein, glL-th of via node is represented to channel information at destination node, the white Gaussian noise at destination node.
Finally, the signal that the receiver of destination node is received by two time slots, joint-detection goes out to launch antenna index
With transmission symbol, optimal maximum likelihood (maximum likelihood, ML) detector is expressed as form：
Wherein, C is the set of relay nodes correctly demodulated, and X is QAM/PSK assemble of symbol.
Figure three illustrates the trunk node selection model of spatial modulation decode-and-forward relay system.The specific implementation of the present invention
Scheme system diagram as shown in Figure 3.
Transmitter architecture is roughly divided into following several steps：
Step 1：It is determined that the parameter for the system to be selected, that is, determine source node transmitting antenna number nTx, the exponent number M of modulation,
Via node number to be selected, the parameter such as the via node number of activation；
Step 2：Each via node calculates each via node according to channel information using the method in the content of the invention
The correct probability metric for demodulating source node identification, notified by back haul link communication (it is assumed here that back haul link mutually
The transmission of data is completely reliable), several maximum via nodes of the value are activated, decode-and-forward relay is carried out；
Step 3：Source node calculates the amount of bits of a frame according to systematic parameter, and this frame data is divided into two groups, one group
For antenna index bit, for the transmitting antenna for selecting to be activated, one group is modulation bit, for carrying out QAM modulation.Again to obtaining
The transmission vector arrived carries out SM modulation, and via node and destination node are broadcasted；
Step 4：The information that the via node being activated is sent to source node is demodulated, and is verified whether correctly, if just
Really, then destination node is transmitted to, otherwise, keeps silent；
Step 5：The signal that destination node is received according to two stages, joint demodulation goes out the information of source node transmission.
Claims (1)
1. a kind of relay node selecting method of spatial modulation decode-and-forward relay system, the described spatial modulation decoding of definition turns
It is Nt to send out source node transmitting antenna number in relay system, and the channel matrix of source node to i-th of via node isIt is special
Levy and be, comprise the following steps：
A. the minimum Eustachian distance d of the point in the source node signal constellation (in digital modulation) figure that each via node is received is calculated, that is, is obtained
Source node passes through via node i to the compound channel of destination node：
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I represents set of relay nodes, and x is modulation symbol；
B. being chosen from all alternative via node subsets makes dmin(H) maximum via node subset, i.e.,：
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Wherein, SetIRepresent the set of all alternative via node subset compositions.
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Cited By (3)
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| CN108174429A (en) * | 2018-01-19 | 2018-06-15 | 成都英格思科技有限责任公司 | A kind of relay node selecting method based on spatial modulation decode-and-forward relay system |
| CN109600793A (en) * | 2018-12-24 | 2019-04-09 | 电子科技大学 | D2D communication dynamics relay selection method based on social relationships |
| CN110518942A (en) * | 2019-07-13 | 2019-11-29 | 西安电子科技大学 | The user scheduling method of the bicyclic relay system of extensive MIMO |
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Cited By (4)
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| CN108174429A (en) * | 2018-01-19 | 2018-06-15 | 成都英格思科技有限责任公司 | A kind of relay node selecting method based on spatial modulation decode-and-forward relay system |
| CN109600793A (en) * | 2018-12-24 | 2019-04-09 | 电子科技大学 | D2D communication dynamics relay selection method based on social relationships |
| CN110518942A (en) * | 2019-07-13 | 2019-11-29 | 西安电子科技大学 | The user scheduling method of the bicyclic relay system of extensive MIMO |
| CN110518942B (en) * | 2019-07-13 | 2021-09-28 | 西安电子科技大学 | User scheduling method of large-scale MIMO double-loop relay system |
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