CN101710839B - Multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system - Google Patents
Multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system Download PDFInfo
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- CN101710839B CN101710839B CN200910183759.7A CN200910183759A CN101710839B CN 101710839 B CN101710839 B CN 101710839B CN 200910183759 A CN200910183759 A CN 200910183759A CN 101710839 B CN101710839 B CN 101710839B
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Abstract
The invention provides a multi-antenna selectivity transmit-diversity method of a wireless OFDM/TDD system, comprising the following steps: receiving intensity detection: a base station receiving unit carries out receiving intensity measurement to the received signals of the different antennas; antenna serial number feedback; the base station receiving unit carries out ordering to the receiving signal intensity of each antenna and feeds the ordering result back to a base station control unit; selectivity transmission: the base station control unit selects a transmission antenna to carry out signal transmission according to the ordering result. In the invention, the physical layer of the base station carries out detection ordering to an ascending receiving signal of each antenna, so as to dynamically select the transmitter antenna, increase the signal receiving intensity of a terminal side, achieve the selective transmit-diversity purpose and improve the communication quality.
Description
Technical field
The present invention relates to the many antennas transmission technology in radio communication, be specifically related to many antenna transmission diversities of OFDM (OFDM) the system base-station method under TDD (time division duplex) mode.
Background technology
The principal element that affects signal quality in wireless OFDM/TDD system is the decline of channel, and the multi-antenna technology in radio communication can effectively resist the fading problem of wireless channel.Wherein the simplest method is sending and receiving diversity.General transmission diversity adopts many antennas (waiting gain) space diversity, so that receiving terminal obtains certain merging gain, realizes comparatively simply, but diversity is not ideal too sometimes.
Summary of the invention
For the problems referred to above, the invention provides a kind of multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system, the method sends diversity by selectivity, can accomplish that energy is more concentrated, diversity is better, and does not increase the cost of existing multi-antenna base station, simple and easy to do.
Its technical scheme is as described below:
The multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system, comprises the following steps:
A. receiving intensity detects
Base station receiving element carries out receiving intensity measurement to the signal in the different antennae of receiving;
B. antenna sequence number is fed back
Base station receiving element carries out each antenna receiving signal intensity sequence, and ranking results is fed back to base station control unit;
C. selectivity sends
Base station control unit selects transmitting antenna to carry out signal transmission according to ranking results.
The further technical scheme of the present invention is:
Described step a specifically comprises the following steps: a1. base station is carried out resource and divided timing, guarantees that the up-downgoing frequency resource that each terminal is taken is corresponding one by one, and in same coherence bandwidth; A2. physical layer is when receiving upward signal, and all subchannels that each terminal is taken, all detect the receiving intensity on it; A3. when processing each terminal, the reception antenna intensity record of all reception subchannels is sorted, to every sub-channels, select and receive one or more the strongest antenna of signal;
Described step b specifically comprises the following steps: b1. feeds back to base station control unit by the information of reflection receiving intensity sequence; B2. at base station transmitting terminal, according to sequencing information, every antenna is added up to the number N of the null terminator Null channel of its optimum reception
mSjused, N
mSjusedthe number of subchannels taking for terminal j; B3. add up the summation N of each terminal acquisition frequency number of resources on every antenna
used;
Described step c specifically comprises the following steps: c1. sends information to the frequency domain of every transmitting antenna, calculates it and sends factor w
k, w
k=N/N
used, wherein, w
kthe transmission factor that represents k root antenna, N is system descending subchannel sum, and makes transmitted signal corresponding to all occupied resources be multiplied by transmission factor w
k, and all associated terminals on should antenna are not all multiplied by the factor 0 by frequency resource, to guarantee not with not having energy to be sent out in frequency resource;
C2. to the frequency domain transmitted signal being disposed in last step, carry out iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to by DAC, through power amplifier, deliver to respective antenna mouth and send.
In the present invention, base station side physical layer sorts by the detection of the uplink receiving signal to every antenna, and Dynamic Selection transmitting antenna increases the signal receiving strength of end side by this, reaches the object that selectivity sends diversity, thereby improves communication quality.
Accompanying drawing explanation
Fig. 1 is wireless OFDM/TDD system schematic of the present invention;
Fig. 2 is base station of the present invention transmitting element schematic diagram;
Fig. 3 is corresponding transmitted signal resource distribution (frequency domain) schematic diagram of each antenna of the present invention.
Embodiment
The multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system, comprises the following steps:
A. receiving intensity detects
Base station receiving element carries out receiving intensity measurement to the signal in the different antennae of receiving;
B. antenna sequence number is fed back
Base station receiving element carries out each antenna receiving signal intensity sequence, and ranking results is fed back to base station control unit;
C. selectivity sends
Base station control unit selects transmitting antenna to carry out signal transmission according to ranking results.
Described step a specifically comprises the following steps: a1. base station is carried out resource and divided timing, guarantees that the up-downgoing frequency resource that each terminal is taken is corresponding one by one, and in same coherence bandwidth; A2. physical layer is when receiving upward signal, and all subchannels that each terminal is taken, all detect the receiving intensity on it; A3. when processing each terminal, the reception antenna intensity record of all reception subchannels is sorted, to every sub-channels, select and receive one or more the strongest antenna of signal;
Described step b specifically comprises the following steps: b1. feeds back to base station control unit by the information of reflection receiving intensity sequence; B2. at base station transmitting terminal, according to sequencing information, every antenna is added up to the number N of the null terminator Null channel of its optimum reception
mSjused, N
mSjusedthe number of subchannels taking for terminal j; B3. add up the summation N of each terminal acquisition frequency number of resources on every antenna
used;
Described step c specifically comprises the following steps: c1. sends information to the frequency domain of every transmitting antenna, calculates it and sends factor w
k, w
k=N/N
used, wherein, w
kthe transmission factor that represents k root antenna, N is system descending subchannel sum, and makes transmitted signal corresponding to all occupied resources be multiplied by transmission factor w
k, and all associated terminals on should antenna are not all multiplied by the factor 0 by frequency resource, to guarantee not with not having energy to be sent out in frequency resource;
C2. to the frequency domain transmitted signal being disposed in last step, carry out iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to by DAC, through power amplifier, deliver to respective antenna mouth and send.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
As shown in FIG. 1 to 3, be one embodiment of the present of invention.There are 4 antennas the base station of this wireless OFDM/TDD system, and 4 receive 4, and illustrated 6 terminals are in access network, by shown in base station service is provided, and to each terminal, the subchannel of uplink assignment is also distributed to corresponding descending simultaneously.Basic principle of the present invention is: in TDD system, think and be assigned to the uplink and downlink signals of same subcarrier, its channel is symmetrical, therefore base station can obtain the estimation of descending transmitting channel from uplink receiving signal, its key is to select best transmitting antenna to carry out signal transmission.
The present invention operates according to following steps:
1, choose terminal j, its shared i sub-channels is calculated to correlation function R
zz(i), and to R
zz(i) diagonal entry is ranked, and record is maximum and corresponding day wire size of time large two elements wherein, inserts table 1, and all the other two diagonal entry respective antenna are inserted table 1 with 0, and j is recycled to 6 from 1; I is recycled to N from 1
mSjused, fill in a form successively.
Table 1 received signal strength table
| Antenna 1 | Antenna 2 | Antenna 3 | Antenna 4 | ...... | |
| Terminal 1 takies subchannel | 1 | 0 | 2 | 0 | |
| Terminal 2 takies subchannel | 0 | 2 | 1 | 0 | |
| Terminal 3 takies subchannel | 2 | 0 | 0 | 1 | |
| Terminal 4 takies subchannel | 0 | 1 | 2 | 0 | |
| Terminal 5 takies subchannel | 1 | 0 | 0 | 2 | |
| Terminal 6 takies subchannel | 0 | 1 | 0 | 2 | |
| ...... |
2, table 1 is mapped to Fig. 3.At base station transmitting terminal, every antenna is added up to the number of the null terminator Null channel of optimum reception on it, as long as table 1 correspondence position be non-zero, being just counted as is the best on this antenna, in Fig. 3 with N
mSjusedrepresent, if table 1 correspondence position is that in 0, Fig. 3, relevant position represents with NULL (sky).
3,, to transmitting antenna k, add up the summation N of each optimum terminal acquisition frequency number of resources
used, according to formula w
k=N/N
usedcalculate it and send factor w
k, and finally make table 2.In formula, N is system descending subchannel sum, take antenna 1 as example, its corresponding N
used=N
mS1used+ N
mS3used+ N
mS5used.
Table 2 sends factor pair and should show
| Antenna 1 | Antenna 2 | Antenna 3 | Antenna 4 | ...... | |
| Terminal 1 takies subchannel | W 1 | 0 | W 3 | 0 | |
| Terminal 2 takies subchannel | 0 | W 2 | W 3 | 0 | |
| Terminal 3 takies subchannel | W 1 | 0 | 0 | W 4 | |
| Terminal 4 takies subchannel | 0 | W 2 | W 3 | 0 | |
| Terminal 5 takies subchannel | W 1 | 0 | 0 | W 4 | |
| Terminal 6 takies subchannel | 0 | W 2 | 0 | W 4 | |
| ...... |
4, according to normal step, produce the frequency-region signal that base band sends, and according to being divided into 4 tunnels shown in Fig. 2, the corresponding transmission factor in table 2 is all multiplied by every road, and all associated terminals on should antenna are not all multiplied by the factor 0 by frequency resource, to guarantee not with not having energy to be sent out in frequency resource.
5, to the frequency domain transmitted signal being disposed in last step, as shown in Figure 2, carry out iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to by DAC, via power amplifier, deliver to respective antenna mouth and send.
Complete after above step, can realize selectivity and send diversity.
The foregoing is only one embodiment of the present of invention; so it is not intended to limit spirit of the present invention and protection range; in the situation that not deviating from spirit of the present invention and essence thereof; various corresponding variation or distortion that those of ordinary skill in the art make, all should be considered as belonging to the protection range of the appended claim of the present invention.
Claims (3)
1. the multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system, is characterized in that, comprises the following steps:
A. receiving intensity detects
Base station receiving element carries out receiving intensity measurement to the signal in the different antennae of receiving;
B. antenna sequence number is fed back
Base station receiving element carries out each antenna receiving signal intensity sequence, and ranking results is fed back to base station control unit, specifically comprises the following steps: b1. feeds back to base station control unit by the information of reflection receiving intensity sequence; B2. at base station transmitting terminal, according to sequencing information, every antenna is added up to the number N of the null terminator Null channel of its optimum reception
mSjused, N
mSjusedthe number of subchannels taking for terminal j; B3. add up the summation N of each terminal acquisition frequency number of resources on every antenna
used;
C. selectivity sends
Base station control unit selects transmitting antenna to carry out signal transmission according to ranking results.
2. the multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system according to claim 1, is characterized in that, described step a specifically comprises the following steps:
A1. base station is carried out resource and is divided timing, guarantees that the up-downgoing frequency resource that each terminal is taken is corresponding one by one;
A2. physical layer is when receiving upward signal, and all subchannels that each terminal is taken, all detect the receiving intensity on it;
A3. when processing each terminal, the reception antenna intensity record of all reception subchannels is sorted, to every sub-channels, select and receive one or more the strongest antenna of signal.
3. the multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system according to claim 1 and 2, is characterized in that, described step c specifically comprises the following steps:
C1. the frequency domain of every transmitting antenna is sent to information, calculate it and send factor w
k, w
k=N/N
used, wherein, w
kthe transmission factor that represents k root antenna, N is system descending subchannel sum, and makes transmitted signal corresponding to all occupied resources be multiplied by transmission factor w
k, and all associated terminals on should antenna are not all multiplied by the factor 0 by frequency resource;
C2. to the frequency domain transmitted signal being disposed in last step, carry out iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to by DAC, through power amplifier, deliver to respective antenna mouth and send.
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| CN200910183759.7A CN101710839B (en) | 2009-08-07 | 2009-08-07 | Multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system |
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| CN200910183759.7A CN101710839B (en) | 2009-08-07 | 2009-08-07 | Multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system |
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| CN102958115A (en) * | 2011-08-30 | 2013-03-06 | 中兴通讯股份有限公司 | Signal processing method and device |
| CN103138821B (en) | 2011-11-30 | 2017-02-08 | 华为技术有限公司 | Method, device and system for data transmission |
| CN106209180B (en) * | 2015-04-30 | 2020-06-02 | 中兴通讯股份有限公司 | Downlink antenna selection method and device of distributed base station |
| CN106533519B (en) * | 2016-11-29 | 2020-01-31 | 河南工业大学 | multi-hop cooperative transmission method based on dynamic antenna selection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258138A (en) * | 1998-10-29 | 2000-06-28 | 松下电器产业株式会社 | Radio communication device and transmitting antenna changing method |
| CN1499867A (en) * | 2002-11-04 | 2004-05-26 | 深圳市中兴通讯股份有限公司 | Method and device for realtime antenna to select emission diversity |
| CN101459958A (en) * | 2009-01-06 | 2009-06-17 | 东南大学 | Downlink resource distributing method for distributed multi-antenna OFDMA system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6956907B2 (en) * | 2001-10-15 | 2005-10-18 | Qualcomm, Incorporated | Method and apparatus for determining power allocation in a MIMO communication system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258138A (en) * | 1998-10-29 | 2000-06-28 | 松下电器产业株式会社 | Radio communication device and transmitting antenna changing method |
| CN1499867A (en) * | 2002-11-04 | 2004-05-26 | 深圳市中兴通讯股份有限公司 | Method and device for realtime antenna to select emission diversity |
| CN101459958A (en) * | 2009-01-06 | 2009-06-17 | 东南大学 | Downlink resource distributing method for distributed multi-antenna OFDMA system |
Non-Patent Citations (1)
| Title |
|---|
| 张静美，王莹，张平.多天线协作传输系统的容量分析与功率分配.《北京邮电大学学报》.2005,第28卷(第5期),全文. * |
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