CN105634711A - Channel state information obtaining method of separated massive antenna array full-duplex wireless communication system - Google Patents
Channel state information obtaining method of separated massive antenna array full-duplex wireless communication system Download PDFInfo
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- CN105634711A CN105634711A CN201610049658.0A CN201610049658A CN105634711A CN 105634711 A CN105634711 A CN 105634711A CN 201610049658 A CN201610049658 A CN 201610049658A CN 105634711 A CN105634711 A CN 105634711A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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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Abstract
The invention relates to a channel state information obtaining method of a separated massive antenna array full-duplex wireless communication system. The method is based on the separated massive antenna array full-duplex wireless communication system. The system is composed of a base station and a mobile terminal; the base station is equipped with two pairs of massive antenna arrays; the mobile terminal is equipped with two pairs of antennas (or antenna arrays); all antennas or antenna arrays work in the same time-frequency resource; one pair of massive antenna arrays of the base station and one pair of antennas of the terminal are paired to form transceiving antenna groups; the other antennas and antenna arrays also form a pair of transceiving antenna groups; the two groups of antennas communicate through a push-pull mode; namely, when one group is uplink, the other group is downlink; then the two groups interchange; one group is in downlink communication, the other group is in uplink communication; and the massive antennas in the two groups alternately obtain the channel station information from an uplink channel training sequence through the periodical push-pull communication mode.
Description
Technical field
The invention discloses the channel state information acquisition method of the extensive antenna array full-duplex wireless communication systems of a kind of separate type, belong to radio communication, signal processing technology field.
Background technology
The extensive antenna communication system of full duplex has full duplex (in-bandfull-duplex) simultaneously and communicates with large-scale wireless the advantage of (MassiveMIMO) technology, therefore, the combination of two kinds of technology can improve frequency resource service efficiency and energy ecology better, thus increasing substantially the network insertion speed of user and the handling capacity of system, and then it is obviously improved the experience of user.
Time-varying characteristics due to radio communication channel, wireless communication system needs periodically to update the status information (ChannelStateInformation of channel, CSI), in order to utilize the resource of each sub-channel to carry out the modulation /demodulation of signal fully when transmission and the information of reception. But the extensive antenna array wireless communication system of separate type is a lot of due to number of antennas, the data volume of its channel condition information is relatively big, causes that status information takies substantial amounts of bandwidth resources. For using the system of shared antenna array, because its reception and transmitting antenna are same common antenna array, it is possible to utilize the up-downgoing channel reciprocity of system to obtain channel condition information, it is not necessary to information is fed back, thus decreasing overhead. But for using the system of separated antenna array, owing to the locus of its up-downgoing antenna is different, the reciprocity of channel therefore cannot be used to obtain channel condition information. How to reduce resource occupation as far as possible, it is achieved the channel condition information of the extensive antenna array wireless communication system of separate type obtains, be the key issue to solve of the extensive antenna array full duplex communication system of separate type.
For above-mentioned reasons, at present to extensive full-duplex antenna communication system CSI acquisition methods, most based on shared aerial array. For separated antenna array, the research of CSI acquisition methods is also little.
Summary of the invention
The channel state information acquisition method of the extensive antenna array full-duplex wireless communication systems of separate type that the present invention proposes, fundamentally solves the problem that the extensive antenna array full-duplex wireless communication systems of separate type obtains channel condition information. The method provides a kind of simple and effective channel condition information for the extensive communication system of co-channel full duplex simultaneously and obtains mode, is not needing on the basis of channel feedback expense, it is achieved spectral efficient, energy-efficient communicate with two-forty.
The technical solution of the present invention is as follows:
A kind of channel state information acquisition method of the extensive antenna array full-duplex wireless communication systems of separate type, the method is based on the extensive antenna array full-duplex wireless communication systems of separate type, this system is made up of base station and mobile terminal, wherein there are two secondary extensive antenna arrays base station, mobile terminal has two slave antennas or antenna array, all antennas or antenna array are all operated in same running time-frequency resource, namely simultaneously with frequency; Wherein the common antenna of the one of base station secondary extensive antenna array and terminal is paired into dual-mode antenna group, another set also partners dual-mode antenna group, two groups of antennas are communicated by push pull mode, namely one group when up, another group is then in descending, subsequently, and two groups of exchanges, one group of downlink communication, another group is then up; Recommending communication mode by the cycle, the extensive antenna in two groups obtains channel condition information, specifically comprising the following steps that of described channel state information acquisition method in turn from up channel training sequence
Step one: upper half cycle, system adopts A group antenna to carry out uplink communication, and B group antenna carries out downlink communication, and terminal use sends pilot training sequence to base station by the up-link in A group antenna, and base station obtains signal in the uplink;
Step 2: base station is according to the pilot training sequence received, estimate the status information received on channel of extensive antenna in A group, the up-downgoing channel being provided to A group uses, in channel coherency time subsequently, base station can utilize the solution that the uplink and downlink channel of A group is carried out data by this channel condition information to be in harmonious proportion always and modulate;
Step 3: lower half cycle, system adopts B group antenna to carry out uplink communication, and A group antenna carries out downlink communication, and terminal use sends pilot training sequence to base station by the up-link in B group antenna, and base station obtains signal in the uplink;
Step 4: base station is according to the pilot training sequence received, estimate the status information received on channel of extensive antenna in B group, the up-downgoing channel being provided to B group uses, in channel coherency time subsequently, base station can utilize the solution that the uplink and downlink channel of B group is carried out data by this channel condition information to be in harmonious proportion always and modulate;
Step one, two, three, four repeat.
Owing to every half period being all initiated pilot training sequence by mobile terminal, therefore base station can be directly obtained the channel condition information of extensive antenna, the feedback of status information is carried out, thus the system that substantially reduces obtains descending channel information and feeds back shared expense without terminal.
Accompanying drawing explanation
Fig. 1: the working method schematic diagram of the present invention;
Fig. 2: the workflow diagram of this method;
Fig. 3: the dual-mode antenna periodic conversion schematic diagram of this method.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further detailed, but is not limited to this example.
Embodiments of the present invention relate to the channel state information acquisition method of the extensive antenna array full-duplex wireless communication systems of a kind of separate type, and the method is based on the extensive antenna array full-duplex wireless communication systems of separate type, as shown in Figure 1. This system is made up of base station and multiple mobile terminal, as shown in Figure 1. System has two two secondary extensive antenna arrays being operated in same frequency and synchronization, is reduced the impact of self-interference between antenna array by physical isolation; Each mobile terminal is also respectively arranged with two subtasks antenna (or antenna array) on same running time-frequency resource, between antenna, has physical isolation equally. The large-scale antenna array A1 of base station and the antenna A2 of terminal forms antenna transmitting-receiving group A, and the large-scale antenna array B1 of base station and the antenna B2 of terminal forms antenna transmitting-receiving group B. At the beginning, upper half periodic system uses A group as up-link, and B group is as downlink; Terminal uses the up channel of A group to transmit pilot frequency sequence, the channel status that base station calculates and estimates on this link, and the user data in upper half this up channel of interim demodulation, then when the lower half cycle, this link was converted to downlink, it is supplied to downlink and does channel precoding, help user to demodulate down channel data. It follows that lower half periodic system uses B group as up-link, A group is as downlink; Terminal uses the up channel of B group to transmit pilot frequency sequence, the channel status that base station calculates and estimates on this link, and the user data in upper half this up channel of interim demodulation, then when the lower half cycle, this link was converted to downlink, it is supplied to downlink and does channel precoding, help user to demodulate down channel data.
This channel state information acquisition method, as shown in Figures 2 and 3, comprises the following steps:
Step one: upper half cycle, system adopts A group antenna to carry out uplink communication, and B group antenna carries out downlink communication. Terminal use sends pilot training sequence to base station large-scale antenna array A1 by the A2 in A group antenna, and base station receives signal in the uplink. Descending pilot frequency distinguishes upward signal and self-interference signal for base station, and estimates for self-interference channel, as shown in Figure 3.
Step 2: the status information received on channel of extensive antenna A1 in A group, according to the pilot frequency sequence received, is estimated in base station, and the up-downgoing channel being provided to A group uses. Within a cycle, in such as 12.5ms, base station can utilize the solution that the uplink and downlink channel of A group is carried out data by this channel condition information to be in harmonious proportion always and modulate.
Step 3: lower half cycle, system adopts B group antenna to carry out uplink communication, and A group antenna carries out downlink communication. Terminal use sends pilot training sequence to base station large-scale antenna array B1 by the B2 in B group antenna, and base station receives signal in the uplink. Descending pilot frequency distinguishes upward signal and self-interference signal for base station, and estimates for self-interference channel, as shown in Figure 3.
Step 4: the status information received on channel of extensive antenna B1 in B group, according to the pilot frequency sequence received, is estimated in base station, and the up-downgoing channel being provided to B group uses. Within a cycle, in such as 12.5ms, base station can utilize the solution that the uplink and downlink channel of B group is carried out data by this channel condition information to be in harmonious proportion always and modulate.
Step one, two, three, four repeat.
Due to every half period is all by mobile terminal initiate pilot tone training, therefore base station can be directly obtained the channel condition information of extensive antenna, the feedback of status information is carried out, thus the system that substantially reduces obtains descending channel information and feeds back shared expense without terminal. The invention solves the problem that the channel condition information of the extensive antenna array full-duplex wireless communication systems of separate type obtains, so that the deployment of separate type extensive antenna array full-duplex wireless communication systems is more simple and feasible.
Claims (1)
1. the channel state information acquisition method of the extensive antenna array full-duplex wireless communication systems of separate type, the method is based on the extensive antenna array full-duplex wireless communication systems of separate type, this system is made up of base station and mobile terminal, wherein there are two secondary extensive antenna arrays base station, mobile terminal has two slave antennas or antenna array, all antennas or antenna array are all operated in same running time-frequency resource, namely simultaneously with frequency; Wherein the common antenna of the one of base station secondary extensive antenna array and terminal is paired into dual-mode antenna group, another set also partners dual-mode antenna group, two groups of antennas are communicated by push pull mode, namely one group when up, another group is then in descending, subsequently, and two groups of exchanges, one group of downlink communication, another group is then up; Recommending communication mode by the cycle, the extensive antenna in two groups obtains channel condition information, specifically comprising the following steps that of described channel state information acquisition method in turn from up channel training sequence
Step one: upper half cycle, system adopts A group antenna to carry out uplink communication, and B group antenna carries out downlink communication, and terminal use sends pilot training sequence to base station by the up-link in A group antenna, and base station obtains signal in the uplink;
Step 2: base station is according to the pilot training sequence received, estimate the status information received on channel of extensive antenna in A group, the up-downgoing channel being provided to A group uses, in channel coherency time subsequently, base station can utilize the solution that the uplink and downlink channel of A group is carried out data by this channel condition information to be in harmonious proportion always and modulate;
Step 3: lower half cycle, system adopts B group antenna to carry out uplink communication, and A group antenna carries out downlink communication, and terminal use sends pilot training sequence to base station by the up-link in B group antenna, and base station obtains signal in the uplink;
Step 4: base station is according to the pilot training sequence received, estimate the status information received on channel of extensive antenna in B group, the up-downgoing channel being provided to B group uses, in channel coherency time subsequently, base station can utilize the solution that the uplink and downlink channel of B group is carried out data by this channel condition information to be in harmonious proportion always and modulate;
Step one, two, three, four repeat.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111385004A (en) * | 2018-12-27 | 2020-07-07 | 北京大学 | Same-frequency simultaneous full-duplex communication system and method based on spatial modulation |
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| EP4320796A2 (en) * | 2021-04-07 | 2024-02-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Flexible antenna port mapping for retaining channel reciprocity in full-duplex wireless communication systems |
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| CN1474525A (en) * | 2002-08-09 | 2004-02-11 | 华为技术有限公司 | Signal transmitting and receiving method based on time-division duplex in radio communication system |
| CN104052529A (en) * | 2013-03-14 | 2014-09-17 | 上海贝尔股份有限公司 | Antenna array and communication method used for full duplex communication |
| CN104753658A (en) * | 2013-12-27 | 2015-07-01 | 中国移动通信集团公司 | Method and device for data transmission in simultaneous same-frequency full duplex system |
| CN104935533A (en) * | 2015-06-16 | 2015-09-23 | 山东大学 | Large-scale antenna mobile communication system and communication method using double-frequency push-pull mode |
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Patent Citations (4)
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| CN1474525A (en) * | 2002-08-09 | 2004-02-11 | 华为技术有限公司 | Signal transmitting and receiving method based on time-division duplex in radio communication system |
| CN104052529A (en) * | 2013-03-14 | 2014-09-17 | 上海贝尔股份有限公司 | Antenna array and communication method used for full duplex communication |
| CN104753658A (en) * | 2013-12-27 | 2015-07-01 | 中国移动通信集团公司 | Method and device for data transmission in simultaneous same-frequency full duplex system |
| CN104935533A (en) * | 2015-06-16 | 2015-09-23 | 山东大学 | Large-scale antenna mobile communication system and communication method using double-frequency push-pull mode |
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