CN101710839A - 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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- CN101710839A CN101710839A CN200910183759A CN200910183759A CN101710839A CN 101710839 A CN101710839 A CN 101710839A CN 200910183759 A CN200910183759 A CN 200910183759A CN 200910183759 A CN200910183759 A CN 200910183759A CN 101710839 A CN101710839 A CN 101710839A
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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 antenna transmission technology in the radio communication, be specifically related to many antenna transmission of OFDM (OFDM) the system base-station deversity scheme under TDD (time division duplex) mode.
Background technology
The principal element that influences signal quality in wireless OFDM/TDD system is the decline of channel, and the multi-antenna technology in the radio communication can effectively resist the fading problem of wireless channel.Wherein the simplest method is to send and receive 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
At the problems referred to above, the invention provides the multi-antenna selectivity transmit-diversity method of a kind of wireless OFDM/TDD system, this 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, and is simple and easy to do.
Its technical scheme is as described below:
The multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system may further comprise the steps:
A. receiving intensity detects
The base station receiving element carries out receiving intensity to the signal on the different antennae of receiving and measures;
B. the antenna sequence number is fed back
The base station receiving element carries out each antenna receiving signal intensity ordering, and ranking results is fed back to base station control unit;
C. selectivity sends
Base station control unit selects transmitting antenna to carry out the signal transmission according to ranking results.
The further technical scheme of the present invention is:
Described step a specifically may further comprise the steps: when resource allocation is carried out in the a1. base station, guarantee that the up-downgoing frequency resource that each terminal is taken is corresponding one by one, and be in the same coherence bandwidth; A2. physical layer is when receiving upward signal, and all subchannels to each terminal takies all detect the receiving intensity on it; A3. when handling each terminal, all reception antenna intensity records that receive subchannel are sorted,, select one or more the strongest antenna of received signal each subchannel;
Described step b specifically may further comprise the steps: b1. will reflect that the feedback information of receiving intensity ordering is to base station control unit; B2. at the base station transmitting terminal,, every antenna is added up the number N of the null terminator Null channel of its optimum reception according to sequencing information
MSjused, N
MSjusedThe number of subchannels that takies for terminal j; B3. add up the summation N of each terminal acquisition frequency number of resources on the every antenna
Used
Described step c specifically may further comprise the 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 of representing k root antenna, N is a system descending subchannel sum, and the transmission signal times that makes all occupied resource correspondences is to send factor w
k, and all associated terminals on should antenna all not multiply by the factor 0 with frequency resource, to guarantee not with there not being energy to be sent out on the frequency resource;
C2. the frequency domain that disposed in the last step is sent signal, carry out the iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to, deliver to the respective antenna mouth through power amplifier and send by DAC.
The base station side physical layer is by the detection ordering to the up received signal of every antenna among the present invention, and the Dynamic Selection transmitting antenna increases the signal receiving strength of end side by this, reaches the purpose that selectivity sends diversity, thereby improves communication quality.
Description of drawings
Fig. 1 is wireless OFDM of the present invention/TDD system schematic;
Fig. 2 is a base station of the present invention transmitting element schematic diagram;
Fig. 3 sends signal resource distribution (frequency domain) schematic diagram for each antenna of the present invention is corresponding.
Embodiment
The multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system may further comprise the steps:
A. receiving intensity detects
The base station receiving element carries out receiving intensity to the signal on the different antennae of receiving and measures;
B. the antenna sequence number is fed back
The base station receiving element carries out each antenna receiving signal intensity ordering, and ranking results is fed back to base station control unit;
C. selectivity sends
Base station control unit selects transmitting antenna to carry out the signal transmission according to ranking results.
Described step a specifically may further comprise the steps: when resource allocation is carried out in the a1. base station, guarantee that the up-downgoing frequency resource that each terminal is taken is corresponding one by one, and be in the same coherence bandwidth; A2. physical layer is when receiving upward signal, and all subchannels to each terminal takies all detect the receiving intensity on it; A3. when handling each terminal, all reception antenna intensity records that receive subchannel are sorted,, select one or more the strongest antenna of received signal each subchannel;
Described step b specifically may further comprise the steps: b1. will reflect that the feedback information of receiving intensity ordering is to base station control unit; B2. at the base station transmitting terminal,, every antenna is added up the number N of the null terminator Null channel of its optimum reception according to sequencing information
MSjused, N
MSjusedThe number of subchannels that takies for terminal j; B3. add up the summation N of each terminal acquisition frequency number of resources on the every antenna
Used
Described step c specifically may further comprise the 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 of representing k root antenna, N is a system descending subchannel sum, and the transmission signal times that makes all occupied resource correspondences is to send factor w
k, and all associated terminals on should antenna all not multiply by the factor 0 with frequency resource, to guarantee not with there not being energy to be sent out on the frequency resource;
C2. the frequency domain that disposed in the last step is sent signal, carry out the iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to, deliver to the respective antenna mouth through power amplifier and send by DAC.
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
As Fig. 1～shown in Figure 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 the access network, by shown in the 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 the TDD system, think the uplink and downlink signals that is assigned to same subcarrier, its channel is symmetrical, so the base station can obtain the estimation of descending transmitting channel from up received signal, its key is to select best transmitting antenna to carry out the signal transmission.
The present invention operates according to following steps:
1, chooses terminal j, to its shared i sub-channel calculation correlation function R
Zz(i), and to R
Zz(i) diagonal entry is ranked, and the wherein maximum and pairing day wire size of time big two elements of record inserted 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 intensity 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 the base station transmitting terminal, every antenna is added up the number of the null terminator Null channel of optimum reception on it, as long as promptly table 1 correspondence position right and wrong 0, just being counted as is the best on this antenna, in Fig. 3 with N
MSjusedExpression, if table 1 correspondence position is 0, the relevant position is represented with NULL (sky) among Fig. 3.
3,, add up the summation N of each optimum terminal acquisition frequency number of resources to transmitting antenna k
Used, according to formula w
k=N/N
UsedCalculate it and send factor w
k, and make table 2 at last.N is a system descending subchannel sum in the formula, is example with antenna 1, its corresponding N
Used=N
MS1used+ N
MS3used+ N
MS5used
Table 2 sends factor correspondence table
| 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 |
| Antenna 1 | Antenna 2 | Antenna 3 | Antenna 4 | ...... | |
| Terminal 6 takies subchannel | ??0 | ??W 2 | ??0 | ??W 4 | |
| ??...... |
4, produce the frequency-region signal that base band sends according to normal step, and be divided into 4 the tunnel according to shown in Figure 2, the corresponding transmission factor in the table 2 is all multiply by on every road, and all associated terminals on should antenna all not multiply by the factor 0 with frequency resource, to guarantee not with there not being energy to be sent out on the frequency resource.
5, the frequency domain that disposed in the last step is sent signal, as shown in Figure 2, carry out the iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to, deliver to the respective antenna mouth via power amplifier and send by DAC.
After finishing above step, can realize that selectivity sends diversity.
The above only is one embodiment of the present of invention; so it is not to be used to limit spirit of the present invention and protection range; under the situation that does not deviate from spirit of the present invention and essence thereof; various corresponding variation or distortion that those of ordinary skill in the art made all should be considered as belonging to the protection range of the appended claim of the present invention.
Claims (4)
1. the multi-antenna selectivity transmit-diversity method of wireless OFDM/TDD system is characterized in that, may further comprise the steps:
A. receiving intensity detects
The base station receiving element carries out receiving intensity to the signal on the different antennae of receiving and measures;
B. the antenna sequence number is fed back
The base station receiving element carries out each antenna receiving signal intensity ordering, and ranking results is fed back to base station control unit;
C. selectivity sends
Base station control unit selects transmitting antenna to carry out the signal transmission according to ranking results.
2. the multi-antenna selectivity transmit-diversity method of wireless OFDM according to claim 1/TDD system is characterized in that, described step a specifically may further comprise the steps:
When a1. resource allocation is carried out in the base station, guarantee 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 to each terminal takies all detect the receiving intensity on it;
A3. when handling each terminal, all reception antenna intensity records that receive subchannel are sorted,, select one or more the strongest antenna of received signal each subchannel.
3. the multi-antenna selectivity transmit-diversity method of wireless OFDM according to claim 1 and 2/TDD system is characterized in that, described step b specifically may further comprise the steps:
The feedback information that b1. will reflect the receiving intensity ordering is given base station control unit;
B2. at the base station transmitting terminal,, every antenna is added up the number N of the null terminator Null channel of its optimum reception according to sequencing information
MSjused, N
MSjusedThe number of subchannels that takies for terminal j;
B3. add up the summation N of each terminal acquisition frequency number of resources on the every antenna
Used
4. the multi-antenna selectivity transmit-diversity method of wireless OFDM according to claim 3/TDD system is characterized in that, described step c specifically may further comprise the steps:
C1. the frequency domain to every transmitting antenna sends information, calculates it and sends factor w
k, w
k=N/N
Used, wherein, w
kThe transmission factor of representing k root antenna, N is a system descending subchannel sum, and the transmission signal times that makes all occupied resource correspondences is to send factor w
k, and all associated terminals on should antenna all not multiply by the factor 0 with frequency resource;
C2. the frequency domain that disposed in the last step is sent signal, carry out the iFFT inverse transformation, add Cyclic Prefix, and convert analog signal to, deliver to the respective antenna mouth through power amplifier and send by DAC.
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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 |
| CN103138821A (en) * | 2011-11-30 | 2013-06-05 | 华为技术有限公司 | Method, device and system for data transmission |
| WO2016173152A1 (en) * | 2015-04-30 | 2016-11-03 | 中兴通讯股份有限公司 | Downlink antenna selecting method and device for distributed base station |
| CN106533519A (en) * | 2016-11-29 | 2017-03-22 | 河南工业大学 | Multi-hop cooperative transmission method based on dynamic antenna selection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102958115A (en) * | 2011-08-30 | 2013-03-06 | 中兴通讯股份有限公司 | Signal processing method and device |
| CN103138821A (en) * | 2011-11-30 | 2013-06-05 | 华为技术有限公司 | Method, device and system for data transmission |
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| CN103138821B (en) * | 2011-11-30 | 2017-02-08 | 华为技术有限公司 | Method, device and system for data transmission |
| WO2016173152A1 (en) * | 2015-04-30 | 2016-11-03 | 中兴通讯股份有限公司 | Downlink antenna selecting method and device for distributed base station |
| CN106209180A (en) * | 2015-04-30 | 2016-12-07 | 中兴通讯股份有限公司 | The uplink/downlink antenna system of selection of distributed base station and device |
| 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 |
| CN106533519A (en) * | 2016-11-29 | 2017-03-22 | 河南工业大学 | Multi-hop cooperative transmission method based on dynamic antenna selection |
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| CN101710839B (en) | 2014-04-02 |
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