CN105516034A - Self-interference combined suppression method in full-duplex large-scale antenna array system - Google Patents
Self-interference combined suppression method in full-duplex large-scale antenna array system Download PDFInfo
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- CN105516034A CN105516034A CN201510824107.2A CN201510824107A CN105516034A CN 105516034 A CN105516034 A CN 105516034A CN 201510824107 A CN201510824107 A CN 201510824107A CN 105516034 A CN105516034 A CN 105516034A
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03305—Joint sequence estimation and interference removal
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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
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/0328—Arrangements for operating in conjunction with other apparatus with interference cancellation circuitry
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- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a self-interference combined suppression method in a full-duplex large-scale antenna array system. The method is based on the full-duplex large-scale antenna array system. The system is composed of a base station, a large-scale antenna array, user equipment, and a circulator. The self-interference combined suppression method is based on combination of a channel estimation technology and the large-scale antenna interference compression technology. After an estimation value of a self-interference channel, a base station subtracts a self-interference part from a received uplink signal; and interference suppression is carried out by using the large-scale antenna interference compression technology, so that the signal to noise ratio of the received signal is improved. Therefore, the capacity and performance of the system are improved.
Description
Technical field
The invention discloses the associating suppressing method of self-interference in a kind of full duplex large-scale antenna array system, belong to radio communication, signal processing technology field.
Background technology
Full duplex technology (in-bandfull-duplex) and extensive antenna multiple-input and multiple-output (large-scaleantenna, massiveMIMO) technology are the alternative technique of the next generation wireless communication that recent years just occurs.These two kinds of technology have many advantages, such as can improve spectrum efficiency, improve capacity usage ratio, improve the transmission rate of user data and the throughput of system, and then obviously improve the experience of user.
But the greatest problem of full duplex technology is that front end self-interference is very strong, the Signal to Interference plus Noise Ratio of receiver (SINR) can be made significantly to decline, thus have influence on systematic function and capacity.Therefore, how to suppress systems radiate end to the self-interference of receiving terminal as much as possible in conjunction with extensive antenna technology, ensureing performance and the capacity of system, is the key issue in full duplex large-scale antenna array system.
More for the AF panel of the non-extensive antenna system of full duplex at present, but the research that full duplex large-scale antenna array self-interference is suppressed also seldom, and almost also not occur for by the research of the self-interference suppression technology that self-interference channel in full duplex is estimated and large-scale antenna array victim compression combines.
Summary of the invention
The invention provides the associating suppressing method of self-interference in a kind of full duplex large-scale antenna array system.The method adopts self-interference channel to estimate the mode tied mutually with large-scale antenna array victim compression technology, significantly can reduce the impact of self-interference further.In this approach, we used two groups of orthogonal guide frequencies, be respectively used to the estimation of up channel and self-interference channel.And, can combine with the estimation procedure of down channel to the estimation procedure of up self-interference (base station self-interference) channel in the method, not need to use new pilot resources to do the estimation of down channel.
The technical scheme of proposition of the present invention is as follows:
A kind of associating suppressing method of self-interference in full duplex large-scale antenna array system, the method is based on full duplex large-scale antenna array system, this system comprises base station and subscriber equipment, described aerial array is the secondary large-scale antenna array simultaneously transmitting and receiving radiofrequency signal in same frequency resource that base station side uses, and also comprises shared circulator full duplex device; Described subscriber equipment is the single antenna mobile device using same frequency resource simultaneously to transmit and receive radiofrequency signal, and also comprise shared circulator full duplex device, the method comprises following process:
Step 1. user adopts one group of orthogonal guide frequency Φ
u, system uplink channel G is trained, and carries out channel estimating in base station side, obtain estimated value
Step 2. base station utilizes the reciprocity of up-downgoing channel, and obtain the pre-coding matrix A of down channel, wherein A is
function, base station utilizes pre-coding matrix to encode to down channel subsequently, and sends to subscriber equipment;
Step 3. base station adopts another group orthogonal guide frequency Φ
d, carry out channel precoding in down channel after, up self-interference channel is trained, then carries out channel estimating in base station side, obtain up self-interference channel estimated value
Step 4. base station utilizes estimated value
calculate up self-interference signal, and deduct up self-interference signal from uplink receiving signal;
The self-interference part use linear processing methods that step 5. is residual to received signal, namely extensive antenna method, suppresses self-interference further.
The method can effectively reduce the impact of self-interference signal on base station received signal, significantly improves signal to noise ratio, thus increases substantially power system capacity and performance.
Accompanying drawing explanation
Fig. 1: present system model;
Fig. 2: the course of work of this method;
Fig. 3: analogous diagram.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed, but is not limited thereto example.
Embodiments of the present invention relate to the associating suppressing method of self-interference in a kind of full duplex large-scale antenna array system, the method based on full duplex large-scale antenna array system, as shown in Figure 1.This system comprises base station, extensive antenna array, subscriber equipment and circulator.The up-downgoing channel of this system meets channel reciprocity, and namely down channel matrix is up channel transpose of a matrix.The method is the self-interference associating suppression technology adopting channel estimating and extensive antenna interference compress technique to combine.Wherein channel estimating comprises signaling channel estimation and interference channel estimation, and concrete grammar such as adopts least mean-square error (MMSE) method; Extensive antenna self-interference suppression technology adopts ZF (ZF) or high specific to send/merge linear predictive coding and decoding processing methods such as (MRT/MRC).After base station obtains the estimated value of self-interference channel, now self-interference signal concerning base station to being known signal, so self-interference part can be deducted from the upward signal that base station receives, and then adopt extensive antenna interference compression method, further suppression interference, thus improve the signal to noise ratio of Received signal strength.
This self-interference suppressing method comprises following process:
Step 1. user adopts one group of orthogonal guide frequency Φ
u(this pilot sequence length is more than or equal to the number of users of 2 times), system uplink channel G is trained, and in base station side, adopt such as MMSE method to carry out channel estimating, obtain estimated value
wherein evaluated error
Step 2. base station utilizes the reciprocity of up-downgoing channel, and obtain the pre-coding matrix A of down channel, wherein A is
function, base station utilizes pre-coding matrix to encode to down channel subsequently, and sends to subscriber equipment; For ZF method,
for MRT/MRC method,
wherein α
zFand α
mRfor normalization factor.
Step 3. base station adopts another group orthogonal guide frequency Φ
d(this group pilot tone simultaneously and Φ
uin pilot tone pairwise orthogonal, pilot length and Φ
uidentical), after utilizing A to carry out channel precoding in down channel, up self-interference channel is trained; In the uplink channel signals that now base station receives, through the training signal that self-interference channel is come after just including precoding, and then adopt MMSE method to estimate, just obtain the estimated value of self-interference channel
wherein evaluated error
g
sa=G
sa, G
sfor the self-interference matrix of large-scale antenna array;
Step 4. base station utilizes the estimated value of interference channel
calculate interference signal, and deduct interference signal from the upward signal received, obtain new upward signal; The useful signal of non-demodulation and remaining self-interference signal and other noises is comprised in new signal;
The self-interference part (evaluated error part) of the remnants in step 5. pair new signal uses the linear processing methods such as ZF or MRT/MRC, suppresses self-interference further; Detailed process is: utilize and obtain in step 1
calculate demodulation matrix W, then with this Matrix Multiplication with new upward signal, thus demodulate useful signal.This matrix is also
function, wherein for ZF method,
for MRT/MRC method,
due to useful signal in the method and interference and the ratio of noise power, i.e. Signal to Interference plus Noise Ratio, linearly increases, so the scale of aerial array can be utilized to compress self-interference error and other error noise further with the increase of antenna amount in aerial array.
This process lasts carries out, as Fig. 2.In addition, as can be seen from accompanying drawing 3, the self-interference signal power using method of the present invention to obtain is starkly lower than the self-interference power (low about 35dB) only adopting large-scale antenna array process to obtain, and that is, the suppression self-interference ability of the inventive method increases significantly.
Claims (1)
1. the associating suppressing method of a self-interference in full duplex large-scale antenna array system, the method is based on full duplex large-scale antenna array system, this system comprises base station and subscriber equipment, described aerial array is the secondary large-scale antenna array simultaneously transmitting and receiving radiofrequency signal in same frequency resource that base station side uses, and also comprises shared circulator full duplex device; Described subscriber equipment is the single antenna mobile device using same frequency resource simultaneously to transmit and receive radiofrequency signal, and also comprise shared circulator full duplex device, the method comprises following process:
Step 1. user adopts one group of orthogonal guide frequency Φ
u, system uplink channel G is trained, and carries out channel estimating in base station side, obtain estimated value
Step 2. base station utilizes the reciprocity of up-downgoing channel, and obtain the pre-coding matrix A of down channel, wherein A is
function, base station utilizes pre-coding matrix to encode to down channel subsequently, and sends to subscriber equipment;
Step 3. base station adopts another group orthogonal guide frequency Φ
d, carry out channel precoding in down channel after, up self-interference channel is trained, then carries out channel estimating in base station side, obtain up self-interference channel estimated value
Step 4. base station utilizes estimated value
calculate up self-interference signal, and deduct up self-interference signal from uplink receiving signal;
The self-interference part use linear processing methods that step 5. is residual to received signal, namely extensive antenna method, suppresses self-interference further.
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| CN201510824107.2A CN105516034B (en) | 2015-11-24 | 2015-11-24 | The joint suppressing method of self-interference in a kind of full duplex large-scale antenna array system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370706A (en) * | 2017-08-21 | 2017-11-21 | 电子科技大学 | A kind of ofdm signal full duplex self-interference suppressing method based on frequency domain half-blindness difference |
| CN110808926A (en) * | 2019-10-12 | 2020-02-18 | 三维通信股份有限公司 | Interference signal estimation method, apparatus, device and computer readable storage medium |
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| CN102769486A (en) * | 2012-07-23 | 2012-11-07 | 上海交通大学 | Method for processing relay end signals in bidirectional multi-hop relay system |
| CN103825674A (en) * | 2012-11-16 | 2014-05-28 | 美国博通公司 | Interference suppression and alignment for cellular networks |
| CN104735789A (en) * | 2013-12-19 | 2015-06-24 | ***通信集团公司 | Inter-cell interference elimination method, device and system |
| CN105027616A (en) * | 2012-12-28 | 2015-11-04 | 株式会社Ntt都科摩 | User equipment, base stations, interference reduction method, and interference reduction control information transmission method |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769486A (en) * | 2012-07-23 | 2012-11-07 | 上海交通大学 | Method for processing relay end signals in bidirectional multi-hop relay system |
| CN103825674A (en) * | 2012-11-16 | 2014-05-28 | 美国博通公司 | Interference suppression and alignment for cellular networks |
| CN105027616A (en) * | 2012-12-28 | 2015-11-04 | 株式会社Ntt都科摩 | User equipment, base stations, interference reduction method, and interference reduction control information transmission method |
| CN104735789A (en) * | 2013-12-19 | 2015-06-24 | ***通信集团公司 | Inter-cell interference elimination method, device and system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370706A (en) * | 2017-08-21 | 2017-11-21 | 电子科技大学 | A kind of ofdm signal full duplex self-interference suppressing method based on frequency domain half-blindness difference |
| CN107370706B (en) * | 2017-08-21 | 2020-01-24 | 电子科技大学 | OFDM signal full-duplex self-interference suppression method based on frequency domain semi-blind difference |
| CN110808926A (en) * | 2019-10-12 | 2020-02-18 | 三维通信股份有限公司 | Interference signal estimation method, apparatus, device and computer readable storage medium |
| CN110808926B (en) * | 2019-10-12 | 2022-04-01 | 三维通信股份有限公司 | Interference signal estimation method, apparatus, device and computer readable storage medium |
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