CN101272629A - Reliable communication method for terminal moving in large range - Google Patents
Reliable communication method for terminal moving in large range Download PDFInfo
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- CN101272629A CN101272629A CNA2008101061721A CN200810106172A CN101272629A CN 101272629 A CN101272629 A CN 101272629A CN A2008101061721 A CNA2008101061721 A CN A2008101061721A CN 200810106172 A CN200810106172 A CN 200810106172A CN 101272629 A CN101272629 A CN 101272629A
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Abstract
The invention relates to a reliable communication method under the condition of movement of a terminal in a large range, in particular to a reliable communication method under the condition of movement of a mobile terminal in a large range by adopting a distributed antenna; the method is characterized in that: when the mobile terminal is moved in the large range, N antennas are adopted for covering and arranged in a distributed way to jointly receive uplink signals; one or more center processing nodes are used for jointly processing and demodulating signals. The center processing node consists of a signal selecting module and a multi-signal joint detecting module; wherein, according to set threshold, the signal selecting module selects n paths (n is more than or equal to 1 and less than or equal to N) in N paths of signals obtained from N antennas and sends the signals to the multi-signal joint detecting module to demodulate original signals at last.
Description
Technical field
The invention belongs to wireless communication field, at portable terminal on a large scale under the situation of movement, adopt spaced antenna to carry out the mobile communication method for receiving uplink, carry out many combined signals selections and processing, thereby reach the purpose of covering and reliable communication at central processing node.
Background technology
In wireless communication system, frequency spectrum resource is limited, and the user increases rapidly for the high-speed data communication demand.On the one hand, because the path loss of signal is very big under the high-frequency, cover mobile communication to more becoming outstanding problem in the high band evolution.On the other hand, along with the development of signal processing and coding techniques, the space that spectrum efficiency improves is more and more littler.The communication structure system of honeycombization has been difficult on the capacity and has had breakthrough.The user on a large scale under the situation of movement, the honeycomb networking structure makes the user be served by a base station generally speaking, brought the cell edge communication quality seriously to descend thus, the user on a large scale under the situation of movement transregional switching frequent, problems such as cutting off rate increase.Root problem is: the sub-district under the honeycomb system is to divide according to the geographical position at present, rather than user oriented.We are badly in need of a kind ofly covering method with reliable communication by networking flexibly under the situation of movement on a large scale at portable terminal.
It almost is infinitely available comparing with running time-frequency resource from the certain angle space resources, inexhaustible in other words conj.or perhaps.The angle of development space resource further improves the availability of frequency spectrum of wireless system.In history, the honeycombization of mobile communication is exactly a revolution of utilizing space resources.In order to improve the utilance of space resources, people have carried out extensive and deep research, smart antenna, space-time code, and emerging research field such as spaced antenna is just therefore and flourish.Distributing antenna system (Distributed Antenna System) has utilized MIMO (multiple-input and multiple-output) thought, utilizes the space diversity characteristic, and good covering is provided, and has improved power system capacity.Distributing antenna system adopts distributed placement antenna.Antenna has low-cost characteristics usually, therefore can high density lay, and making full use of space resources, and the Combined Treatment by signal between the antenna, avoid switching, improve communication reliability and validity.
Southeast China University has proposed under the structure of sub-district with Como (Beijing) Research on Communication Technology center Co., Ltd patents " distributing antenna system and communication means thereof " all, adopt spaced antenna in a sub-district, to communicate, deliver to a kind of networking structure that CPU is carried out signal processing with the user.This method is similar to cell splitting and adopts Microcell to improve the mode of power system capacity.Its another patent " method for receiving uplink in a kind of distribution antenna mobile communication system and equipment " has proposed to adopt under the MIMO technical conditions at reception antenna, by calculating the autocorrelation matrix of received signal, judge subchannel gains through characteristic value decomposition, thereby selection communication quality multichannel preferably carries out the method for upward signal reception and demodulation, thereby has utilized the benefit of space diversity.This method does not make full use of multiple signals spatial degrees of freedom and combined signal processing gain.In user's moving process, still there is switching problem.
The network configuration that the present invention relates to breaks through the conventional cellular cell notion, adopts spaced antenna, and antenna is linked to each other by cable network with processing node, many antenna datas of central processing node Combined Treatment, as shown in Figure 1.A system can comprise one or more central processing nodes.Portable terminal can communicate with all N root antennas simultaneously, adopts other multiplex modes such as frequency division, time to grade and carry out multi-user's access between the multi-user.
Summary of the invention
The present invention propose a kind of portable terminal on a large scale under the situation of movement, the method for carrying out reliable communication.This method breaks through the structure distribution formula of sub-districtization and places antenna, and the method that adopts allied signal to handle is carried out the reception of upward signal.
Described method contains step successively:
Step (1) is in the possible moving range of portable terminal, adopt N root antenna to carry out distributed covering, the upward signal of associating mobile terminal receive, utilize at least one central processing node to be connected with described N root antenna again by cable network and central processing node between connect;
Step (2) is on each described central processing node, and signalization is selected module and many combined signals detection module, wherein:
Signal selection module is provided with signal and selects required threshold value, and the signal of selecting at least one to satisfy described threshold value merges;
At least one signal that satisfies described threshold value after many combined signals detection module merges from described signal detection module input carries out many combined signals and detects the demodulation primary signal;
Described threshold value is the path loss threshold value, the threshold value of the distance of portable terminal and N antenna geographical position distance, or a kind of in the threshold value of N channel relevancy feature.
The system that is realized successively can on a large scale under the situation of movement, provide covering in terminal efficient, flexible.And by the Combined Treatment multi-antenna signal, overcome the terminal frequent shortcoming of switching and being difficult to guarantee at the cell edge communication quality in the conventional cellular cell under the situation of movement on a large scale.
Description of drawings
Fig. 1 represents of the present invention at portable terminal on a large scale under the situation of movement, the structural representation of reliable communications system.Fig. 1-a is that described distributed system is handled notion, and Fig. 1-b is traditional bee dance cell signal individual processing structure, and Fig. 1-c is that many combined signals are handled structure.
Fig. 2 represents of the present invention at portable terminal on a large scale under the situation of movement, reliable communications system signal processing flow figure.
Embodiment
Distributing antenna system of the present invention comprise the distributed placement of N root antenna (A1, A2 ... AN), do not adopt cell structure, according to covering and user density, communication requirement amounts etc. are adjusted antenna amount and are placed density, can conveniently carry out the expansion of area coverage and the adjustment of density.Portable terminal can communicate with N root antenna simultaneously, adopt between the multi-user frequency division or the time multiplex mode that grades avoid interference.Along with the travelling carriage motion, each antenna receiving signal changes thereupon, utilize the mode of signal processing to select the n road in N received signal of N root antenna (1≤n≤N) merges the demodulation with signal in physical layer, avoided carrying out in the cellular system power ratio and triggered the process of switching, the expense between physical layer and the high level has been lacked in letter.Fig. 1 has compared combined signal processing mode in conventional cell architecture signals processing mode and the spaced antenna.According to information-theoretical viewpoint, the allied signal processing mode has farthest kept the information of each road signal in the distributing antenna system, has more performance.
Signal selection module is mainly finished from N signal and to be selected the n road (function of 1≤n≤N).Selective rule has:
(1) by receiving the carrier-to-noise ratio of N road signal; Or,
(2) pass through path loss; Or,
(3) distance by portable terminal and N antenna geographical position; Or,
(4) N channel relevancy feature selecting n road signal;
By above-mentioned rule, can reduce the data processing amount that combined signal detects, select the cluster signal of good communication quality (signal to noise ratio is higher, or disturbs less or the geographical position is more concentrated) to carry out demodulation, obtain primary signal.
Here when n=1, distributed frame deteriorates to the structure of sub-districtization, promptly selects a best signal of communication quality to carry out demodulation; When n=N, distributed frame is equivalent to the communication plan of Blast structure in the mimo system.Here we point out both of these case and are got rid of.
Be further detailed below in conjunction with accompanying drawing 2.
For example comprise 50 antennas in the system, a central processing node owing to do not carry out the phase mutual interference between the user on spatial reuse, therefore, is an example with a portable terminal.When terminal moved on a large scale and carries out transmitting uplink data, 50 antennas all can receive the upward signal of portable terminal.When because path loss, aerial receiver is because sensitivity restriction can't receive this signal the time, and receiving signal is 0.At moment k, 50 antennas are with received signal y
i(k) (i=1,2,3 ..., N) import central processing node into.
Central processing node comprises signal selection module and many combined signals detection module.50 signals are selected by the method that allied signal is handled in signal selection module, merge.
For example, adopt setting signal-noise ratio threshold value criterion: if SNR
i＞SNR
Th, select i road signal to carry out the merging of multiple signals.SNR
ThBe default signal-noise ratio threshold.Also Signal-to-Noise can be sorted, order is got a fixed number n signal by size.Or,
Adopt the geographic distance criterion: under the situation that has the location auxiliary equipment, can obtain the geographical position of portable terminal, the locating information that the storage antenna distributes in the center processing unit with certain precision.According to nearby principle, be the center with the portable terminal, fall into the signal of the circle antenna of certain radius formation, select n road signal by signal selection module and merge.
More than be several implementation methods of signal selection module.By the n road signal that signal selection module obtains, many signal processing modules algorithm can adopt any existing multi-antenna signal detection scheme not within scope of patent protection.
Claims (2)
1. a terminal moves reliable communication means down on a large scale, it is characterized in that described method contains step successively:
Step (1) is in the possible moving range of portable terminal, adopt N root antenna to carry out distributed covering, the upward signal of associating mobile terminal receive, utilize at least one central processing node to be connected with described N root antenna again by cable network and central processing node between connect;
Step (2) is on each described central processing node, and signalization is selected module and many combined signals detection module, wherein:
Signal selection module is provided with signal and selects required threshold value, and the signal of selecting at least one to satisfy described threshold value merges;
At least one signal that satisfies described threshold value after many combined signals detection module merges from described signal detection module input carries out many combined signals and detects the demodulation primary signal.
2. according to claim 1, described a kind of terminal is reliable communication means under the mobile condition on a large scale, it is characterized in that, described threshold value is the path loss threshold value, the threshold value of the distance of portable terminal and N antenna geographical position distance, or a kind of in the threshold value of N channel relevancy feature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101061721A CN101272629B (en) | 2008-05-09 | 2008-05-09 | Reliable communication method for terminal moving in large range |
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| CN2008101061721A CN101272629B (en) | 2008-05-09 | 2008-05-09 | Reliable communication method for terminal moving in large range |
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| CN101272629A true CN101272629A (en) | 2008-09-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010105533A1 (en) * | 2009-03-16 | 2010-09-23 | 中兴通讯股份有限公司 | Tradeoff decision method and system for transmitting multimedia broadcast multicast service |
| CN104717046A (en) * | 2013-12-12 | 2015-06-17 | 中兴通讯股份有限公司 | Demodulation method and device of voice services over adaptive multi-user channels on one slot (VAMOS) system uplink signals |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5761619A (en) * | 1995-03-23 | 1998-06-02 | Telefoanktiebolaget Lm Ericsson | Distributed telecommunications system |
| SE0301259D0 (en) * | 2003-04-24 | 2003-04-24 | Ericsson Telefon Ab L M | Improvements in or relating to distributed radio units |
| CN1917388B (en) * | 2005-08-16 | 2011-04-20 | 东南大学 | Distribution type antenna system, and communication method |
| CN1980088B (en) * | 2005-11-30 | 2011-06-22 | 东南大学 | Upstream chain receiving method and apparatus in distribution antenna mobile communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010105533A1 (en) * | 2009-03-16 | 2010-09-23 | 中兴通讯股份有限公司 | Tradeoff decision method and system for transmitting multimedia broadcast multicast service |
| CN104717046A (en) * | 2013-12-12 | 2015-06-17 | 中兴通讯股份有限公司 | Demodulation method and device of voice services over adaptive multi-user channels on one slot (VAMOS) system uplink signals |
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| CN101272629B (en) | 2011-05-11 |
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