CN104993858B - A kind of TDD communication means - Google Patents
A kind of TDD communication means Download PDFInfo
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- CN104993858B CN104993858B CN201510294080.0A CN201510294080A CN104993858B CN 104993858 B CN104993858 B CN 104993858B CN 201510294080 A CN201510294080 A CN 201510294080A CN 104993858 B CN104993858 B CN 104993858B
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
-
- 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
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Abstract
The present invention relates to a kind of TDD communication means, this method includes：When node sends signal, randomly choose a channel and time slot S, channel is detected since time slot 0, until selected time slot S detections finish, detect whether the transmitting signal of other nodes, if not or thering is the signal of other node transmittings and the power of the signal to be less than thresholding H, this node transmission signal；Base station is on all channels, on all 1/D scores symbolic points, to each score symbolic point, carries out channel estimation, and the transmission signal that whether there is node on score symbolic point is judged according to the result of channel estimation；Such as there is the signal of node transmission, then wave beam is formed to the node, and receive the node signal；After the reception for completing all nodes transmission signals of this time slot, base station sends signal by spread spectrum communication；Node receives signal by spread spectrum communication.The each channel of this method can receive multiple users while send signal, greatly improve uplink user capacity.
Description
Technical field
The present invention relates to a kind of communication means to belong to the machine of long range low data rate in particular to a kind of TDD communication means
Device is to machine communication (M2M) technical field.
Background technology
Currently, the uplink and downlink in long range low data rate M2M wireless communications all uses spread spectrum communication mode, although spread spectrum is logical
The communication overlay distance grown may be implemented very much in letter, but power system capacity is relatively low.Therefore, it in order to meet M2M communication demand, needs to realize
The communication overlay distance of overlength and a large amount of machine communication user of receiving, and especially needed in long range low data rate M2M communication
It solves the problems, such as to be uplink communication user capacity.
Invention content
Present invention aims to overcome that above-mentioned the deficiencies in the prior art and a kind of TDD communication means is provided, this method is under
Row still uses spread spectrum communication mode, but in uplink, uses the modes such as multi-antenna beam forming and narrow band signal system to improve
User capacity.
Realize the object of the invention the technical solution adopted is that a kind of TDD communication means, this method include：
When S100, node sends signal, a channel C and time slot S is randomly choosed, channel C is detected since time slot 0,
It is finished until selected time slot S is detected, detects whether the transmitting signal of other nodes, if without the letter of other nodes transmitting
Number, or signal if any the transmitting of other nodes and the power of the signal is less than thresholding H, then this node sends signal；
S200, base station are on all channels, on all 1/D scores symbolic points, to each score symbolic point, carry out channel
Estimation judges whether according to the training sequence that the result of channel estimation judges to send with the presence or absence of node on score symbolic point
There are the transmission signals of node；Such as there is the signal of node transmission, then the node is formed and receive wave beam, and receives node letter
Number；
S300, after completing the reception that all nodes of this time slot send signals, base station sends signal by spread spectrum communication；
S400, node receive signal by spread spectrum communication.
Further, in step S100, if detected the transmitting signal of other nodes, and the power that detection obtains would be more than
Thresholding H, then abandon the send opportunity of this upward cycle, and next upward cycle reselects channel and time slot.
Further, in step S100, the preceding K symbol that node sends signal is training sequence, and the training sequence is
Symbol known to a string of base stations is data symbol after training sequence.
In the above-mentioned technical solutions, base station uses multiple antennas receiving node uplink signal.
Further, in step S200, channel estimation includes：
Since present score symbolic point, K sampled point is extracted, symbol period T is divided between extractionsym, x [k], k=0,
1,…,K-1；X [k] is N-dimensional column vector, and N is reception antenna quantity, and x [k] is that all antennas receive signal in k-th of sampled point
Sampled value constitute vector；
X [k] is multiplied with training sequence p [k], is obtained
Other node signals of channel estimation are completed before inhibiting, detailed process is：Such as present score symbolic point it
Preceding to have judged have M user sending signal, channel response is respectively hm, h=0,1 ..., M-1, hmIt is N-dimensional column vector；Suppression
It is as follows to make wherein m-th of user：
Inhibit this M user successively；
Channel estimation is as follows：
Obtaining judgment variables is | h |2, when | h |2When more than FN times of noise power, which enters candidate；If
The score symbolic point | h |2More than front and back total L score symbolic point | h |2, in the score symbolic point, there are node transmissions for judgement
Signal.
In the above-mentioned technical solutions, the node, which is formed, receives wave beam, beam coefficient hH。
Using the method for the present invention, machine terminal user can not only use all narrow band channels, but also each channel may be used also
To receive multiple users while send signal, the uplink user capacity greatlyd improve.In addition, shaped by multi-antenna beam,
The reception power for also improving user, to ensure that communication distance.
Description of the drawings
Fig. 1 is the flow chart of TDD communication means of the present invention.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Communication means duplex mode of the present invention uses TDD, downstream cycle and upward cycle to send alternately, bandwidth of operation
It is specific such as 200kHz for B.Downlink, signal occupy whole bandwidth B.Uplink, from node to base station, using narrowband single carrier communication
Technology, each channel width are BC, whole bandwidth B is divided into C≤B/BCA channel.Using downlink call duration time end point as starting point
(time 0), mark off S=Tu/TslotA time slot, node can arrive T in time interval 0uBetween arbitrary time slot start send letter
Number, TslotIt is slot cycle, typical TuFor 100ms, typical TslotIt is 400 for 0.25ms, typical S.
In the present embodiment, node configures an antenna and is used for receiving and transmitting signal, and base station configures N root antennas and is used for receiving and transmitting signal.
As shown in Figure 1, TDD communication means of the present invention specifically includes following steps：
When S100, node send signal, a channel C and time slot S is randomly choosed, to channel C from time slot 0 (at first
Gap) start to detect, it is finished until selected time slot S is detected, the transmitting signal of other nodes is detected whether, if not other
The signal of node transmitting, or signal if any the transmitting of other nodes and the power of the signal are less than thresholding H, then this node is sent out
The number of delivering letters；
If detecting the transmitting signal of other nodes, and the power that detection obtains is more than thresholding H, then abandons this uplink
The send opportunity in period, next upward cycle reselect channel and time slot.
The base unit that uplink sends signal is symbol, and the time interval between two adjacent-symbols is symbol period, note
For Tsym.In the present embodiment, the preceding K symbol that uplink sends signal is training sequence, and training sequence is the known symbol in a string of base stations
Number.The transmission data symbol after training sequence.Typical K is 32.The training sequence is represented by p [k], k=0,1 ..., K-1.
S200, base station are on all channels, on all 1/D (typical D is 4) score symbolic point, to each score symbol
Point carries out channel estimation, and the training sequence that whether there is node transmission on score symbolic point is judged according to the result of channel estimation,
Judge whether the transmission signal of node；Such as there is the signal of node transmission, then the node is formed and receive wave beam, and connect
Receive the node signal.In the present embodiment, the beam coefficient for receiving wave beam is hH, i.e. the conjugate transposition of h.
The present embodiment carries out channel estimation in the following manner：
Since present score symbolic point, K sampled point is extracted, symbol period T is divided between extractionsym, x [k], k=0,
1,…,K-1；X [k] is N-dimensional column vector, and N is reception antenna quantity, and x [k] is that all antennas receive signal in k-th of sampled point
Sampled value constitute vector；
X [k] is multiplied with training sequence p [k], is obtained
The signal of other nodes of channel estimation is completed before inhibiting, detailed process is：Such as in present score symbolic point
Judge have M user in transmission signal before, channel is respectively accordingly hm, m=0,1 ..., M-1, hmIt is N-dimensional column vector；
Inhibit wherein m-th of user as follows：
Inhibit this M user successively；
Then channel estimation is as follows：
Obtaining judgment variables is | h |2, when | h |2(refer to making an uproar in single antenna more than FN (typical F is 10) times noise power
Acoustical power) when, which enters candidate, i.e., there may be nodes to send signal for the score symbol；If the score accords with
Number point | h |2More than front and back total L score symbolic point | h |2, in the score symbolic point, there are nodes to send signal, allusion quotation for judgement
The L of type takes 4.
Above-mentioned steps are executed one by one since the first score symbolic point to the last one score symbolic point.
S300, after completing the reception that all nodes of this time slot send signals, start downstream cycle, base station passes through spread spectrum communication
Send signal.
S400, node receive signal by spread spectrum communication.
In the method for the present invention, downstream cycle realizes signal hair that is, from base station to node using existing spread spectrum technic
It send and receives, details are not described herein again.
Claims (1)
1. a kind of TDD communication means, which is characterized in that including：
When S100, node send signal, a channel C and time slot S is randomly choosed, channel C is detected since time slot 0, until
Selected time slot S detections finish, and detect whether the transmitting signal of other nodes, if without the signal of other nodes transmitting,
Or signal if any the transmitting of other nodes and the power of the signal are less than thresholding H, then this node sends signal；If detection
To the transmitting signal of other nodes, and the power that detection obtains is more than thresholding H, then abandons the send opportunity of this upward cycle,
Next upward cycle reselects channel and time slot；The preceding K symbol that node sends signal is training sequence, the training sequence
It is symbol known to a string of base stations, is data symbol after training sequence；
S200, base station use multiple antennas receiving node uplink signal, and base station is on all channels, in all 1/D scores symbolic points
On, to each score symbolic point, channel estimation is carried out, is judged on score symbolic point with the presence or absence of section according to the result of channel estimation
The training sequence that point is sent, that is, judge whether the transmission signal of node；The signal that such as there is node transmission, then to the node
It is formed and receives wave beam, and receive the node signal, the node, which is formed, receives wave beam, beam coefficient hH；Channel estimation packet
It includes：
Since present score symbolic point, K sampled point is extracted, symbol period T is divided between extractionsym, x [k], k=0,1 ...,
K-1；X [k] is N-dimensional column vector, and N is reception antenna quantity, and x [k] is that all antennas receive sampling of the signal in k-th of sampled point
It is worth the vector constituted；
X [k] is multiplied with training sequence p [k], is obtained
Other node signals of channel estimation are completed before inhibiting, detailed process is：Such as before present score symbolic point
Judgement has M user sending signal, and channel response is respectively hm, m=0,1 ..., M-1, hmIt is N-dimensional column vector；Inhibit it
In m-th of user it is as follows：
Inhibit this M user successively；
Channel estimation is as follows：
Obtaining judgment variables is | h |2, when | h |2When more than FN times of noise power, which enters candidate；If this point
Numerical symbol point | h |2More than front and back total L score symbolic point | h |2, judgement, which is sent in the score symbolic point there are node, to be believed
Number；
The node is formed and receives wave beam, beam coefficient hH；
S300, after completing the reception that all nodes of this time slot send signals, base station sends signal by spread spectrum communication；
S400, node receive signal by spread spectrum communication.
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| CN107947829B (en) * | 2017-12-27 | 2023-07-25 | 上海道生物联技术有限公司 | Time division duplex communication system and method combining spread spectrum and narrowband MIMO |
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| WO2009107444A1 (en) * | 2008-02-26 | 2009-09-03 | 富士電機システムズ株式会社 | Exposed radioactivity management system, dosimeter and repeater |
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| CN101005308A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Physical layer random access method for broad band time division duplex mobile communication system |
| CN101110629A (en) * | 2006-07-18 | 2008-01-23 | 展讯通信（上海）有限公司 | Confirming method for controlling frequency point access time of day in non-center system |
| CN101336006A (en) * | 2007-06-26 | 2008-12-31 | 上海无线通信研究中心 | Time division multiplexing access method for multiple stochastic access signal in transmission time slot |
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