CN104617998A - Closed-loop MIMO uncooperative receiving method and device - Google Patents

Abstract

The invention relates to the technical field of wireless communication, in particular to a closed-loop MIMO uncooperative receiving method and device. The closed-loop MIMO uncooperative receiving method mainly includes that an uncooperative receiver disturbs an up-link pilot frequency from a target user to a base station according to acquired target user information to enable the base station to be incapable of correctly estimating an up channel from the target user to the base station so as to change a weighting matrix used in a shaped beam based on an SVD (singular value decomposition) algorithm, the wave beam direction of an emitting antenna cannot align to the target user, and the uncooperative receiver obtains more down signal energy. The closed-loop MIMO uncooperative receiving method and device have beneficial effects that the uncooperative receiver obtains more down information energy from the base station to the target user than that of a method without pilot frequency disturbance; the effect is the same with that of a random noise-based up-link pilot frequency disturbance method through less disturbance emitting power; the disturbance emitting power is smaller. The closed-loop MIMO uncooperative receiving method is especially suitable for the uncooperative receiving method.

Description

A kind of non-cooperation method of reseptance of closed-loop MIMO and device thereof

Technical field

The present invention relates to wireless communication technology field, particularly the non-cooperation method of reseptance of a kind of closed-loop MIMO and device thereof.

Background technology

No matter be current commercial signal communication system or military communication system, 3G, B3G or even 4G have progressed in the middle of daily life.But due to the opening of wireless communication system environments, such as transmitting procedure whether many doubts such as safety will inevitably be brought.In military communication and special communication environment, safe transmission is exactly the very crucial problem needing in wireless communication system to consider.

Many scholars are had to carry out large quantity research for the strategy of safe transmission both at home and abroad, propose such as based on the safety method of MISO cognitive radio networks of man made noise's interference, based on the optimization method of the beam forming pre-coding matrix of convex optimization relevant knowledge and man made noise, based on the safety of physical layer algorithm of cooperation interference, the safe transmission method and data encryption technology etc. based on feedback and LDPC code.What wherein apply often is when transmitting terminal has obtained CSI (channel condition information), by adopting beam forming technique, by signal energy as far as possible concentration of transmissions to targeted customer direction, add artificial interference simultaneously, thus suppress and weaken the non-cooperation receiving ability of non-cooperation recipient, and then realize the object of safe transmission.

It is less that beamforming transmission technology is mainly used in antenna distance, in the middle of the more much higher aerial array of correlation, it is by selecting in top-quality transmission channel transmitting data information, the energy of signal is focused on the direction of propagation of expectation as much as possible, this compares the transmission means not adopting beam forming technique, in transmitting procedure, the leakage of signal greatly reduces, so beam forming technique can be counted as a kind of safe transmission method of very easy realization.Wherein the main representative of traditional beam forming technique is intelligent antenna technology, this technology is by utilizing the principle of interference of ripple and the stronger correlation of reciprocal space channel, adopt the downlink precoding method based on non-code book, the user side expected to producing the stronger directive radiation beam of tool, thus make different aerial signals the user side expected to realizing maximized Phase Stacking, like this with regard to the radiation direction of signal transmission adaptively towards direction, desired user place, and then improve the signal to noise ratio of receiving terminal, can the error rate be reduced simultaneously.

OFDM technology, owing to having the advantage such as the natural ability to anti-multipath jamming, flexibly bandwidth occupation mode, good channel frequency adaptive ability, becomes main signal madulation mode.The employing of mimo antenna technology can the performance of elevator system, particularly can according to the real-time change of channel by technology such as closed loop precoding, wave beam formings, takes different signal radiation patterns thus improves the capacity of wireless channel to a great extent.To the non-cooperation reception technique of the ofdm signal of single-antenna wireless communication system, comprise Signal analysis, Signal parameter estimation and signal detection technique, research existing more at present, but little for the non-cooperation reception technique research of MIMO precoding technique.

Summary of the invention

Object of the present invention is exactly for the problems referred to above, proposes a kind of non-cooperation method of reseptance of closed-loop MIMO under the single user environment of single community.

Technical scheme of the present invention: the non-cooperation method of reseptance of a kind of closed-loop MIMO, is characterized in that:

Non-cooperation recipient is according to the targeted customer's information obtained, targeted customer is disturbed to the ascending pilot frequency of base station, make base station end can not correctly estimating target user to the up channel of base station, and then the weighting matrix that change base station end uses in the wave beam forming based on SVD (singular value decomposition) algorithm, the beam direction of transmitting antenna can not be aimed at the mark user, make non-cooperation recipient obtain more downstream signal energy.

Further, targeted customer's information of described acquisition is the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot, to the concrete grammar that targeted customer disturbs to the ascending pilot frequency of base station be then: non-cooperation recipient is when targeted customer sends uplink information, and row pilot frequency locations sends frequency domain white Gaussian noise signal and disturbs thereon.

Further, targeted customer's information of described acquisition is the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot and the uplink pilot sequence X of targeted customer's use, to the concrete grammar that targeted customer disturbs to the ascending pilot frequency of base station be then: non-cooperation recipient is when targeted customer sends uplink information, row pilot frequency locations sends with the pilot frequency sequence aX identical with targeted customer of certain weight factor thereon, wherein a > 0 and a is real number.

Further, targeted customer's information of described acquisition is the uplink channel information of the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot, uplink pilot sequence X that targeted customer uses and targeted customer, then to the concrete grammar that targeted customer disturbs to the ascending pilot frequency of base station be:

Non-cooperation recipient is by descending pilot frequency information, obtain the descending channel information of base station end to non-cooperation recipient, again by the up-downgoing channel reciprocity of TDD system, obtain the uplink channel information of non-cooperation recipient to base station end, again respectively singular value decomposition is carried out to the up channel of this channel and targeted customer, and construct interference signal matrix according to singular value decomposition so change non-cooperation recipient each group antenna interference pilot tone, when targeted customer sends uplink information, row pilot frequency locations sends this Pilot Interference signal thereon.

In this programme, under the single user environment of single community, concrete method is: when single user base station, single community to user descending be 42 receive, non-cooperation recipient 2 groups of 2 antennas (4 antenna) here:

(1) first non-cooperation recipient is by up channel feedback mechanism, obtains the uplink channel information that user is current simultaneously based on 2 groups of independently double-antenna structures, descending pilot frequency is utilized to estimate and TDD system up-downgoing channel reciprocity obtains the channel of non-cooperation recipient first group of double antenna to base station non-cooperation recipient second group of double antenna is to the channel information of base station because have good independence between non-cooperation recipient 2 groups of antennas, non-cooperation recipient is to the equivalent channel matrix of base station in fact can think:

$H_{4\×4}^{\mathrm{ev}\_\mathrm{up}}=\begin{array}{c}\left(\begin{array}{cc}{H}_{4\×2}^{\mathrm{ev}\_\mathrm{up}\_1}& H_{4\×2}^{\mathrm{ev}\_\mathrm{up}\_2}\end{array}\right)\end{array},$

Here first group of double antenna of non-cooperation recipient had both received the downlink information of base station to user, also send interference signal when user sends ascending pilot frequency, and second group of antenna is only estimated for down channel and sends interference signal when user sends ascending pilot frequency and catch the channel information of user feedback.

(2) right with carry out SVD to obtain:

$H_{4\×2}^{\mathrm{ue}\_\mathrm{up}}=U_{4\×4}^{\mathrm{ue}}{\left(\begin{array}{c}{D}_{2\×2}^{\mathrm{ue}}\\ 0\end{array}\right)}_{4\×2}{\left(V_{2\×2}^{\mathrm{ue}}\right)}^H,$

$H_{4\×4}^{\mathrm{ev}\_\mathrm{up}}=U_{4\×4}^{\mathrm{ev}}{D}_{4\×4}^{\mathrm{ev}}{\left(V_{4\×4}^{\mathrm{ev}}\right)}^H,$

Wherein with be unitary matrice, and $U_{4\×4}^{\mathrm{ue}}=\left(\begin{array}{cccc}{u}_1^{\mathrm{ue}}& u_2^{\mathrm{ue}}& u_3^{\mathrm{ue}}& u_4^{\mathrm{ue}}\end{array}\right)$ Column vector form can be write as.Easily know diagonal matrix there is inverse matrix

(3) based on right with carry out the result structural matrix M of SVD _{4 × 2}, its structure is:

$M_{4\×2}=V_{4\×4}^{\mathrm{ev}}{\left(D_{4\×4}^{\mathrm{ev}}\right)}^{-1}{\left(U_{4\×4}^{\mathrm{ev}}\right)}^H{\left(\begin{array}{cc}{u}_1^{\mathrm{ue}}& u_2^{\mathrm{ue}}\end{array}\right)}_{4\×2}{D}_{2\×2}^{\mathrm{ue}}{\left(V_{2\×2}^{\mathrm{ue}}\right)}^H$

$=\left(\begin{array}{c}{M}_{2\×2}^1\\ M_{2\×2}^2\end{array}\right),$

(4) set the uplink pilot sequence of user as X, the interference signal that now non-cooperation recipient first group of double antenna sends in ascending pilot frequency position is:

$a\·X-a\·M_{2\×2}^1\·X,$ 1 > a > 0 and a is real number;

The interference signal that second group of double antenna sends in ascending pilot frequency position is:

1 > a > 0 and a is real number.

The non-cooperation receiving system of a kind of closed-loop MIMO, is characterized in that, comprises signal receiving module, data processing module, jamming pattern selection module, interference signal sending module and memory module; Described signal receiving module selects module, memory module and data processing module to be connected with jamming pattern respectively; Described data processing module is connected with interference signal sending module; Wherein,

Described signal receiving module is used for the information of receiving target user;

Described jamming pattern selects module for the targeted customer's Information Selection interference module according to acquisition, and jamming pattern instruction is sent to data processing module; Described jamming pattern comprises random noise disturbance pattern, weight factor jamming pattern and scale factor jamming pattern;

Data processing module carries out interfering data process according to the instruction of jamming pattern, and the interference signal obtained is sent to interference signal sending module; The processing method of described interfering data is:

When jamming pattern is random noise disturbance pattern, data processing module extracts storage frequency domain white Gaussian noise signal in a storage module as interference signal;

When jamming pattern is weight factor jamming pattern, the uplink pilot sequence X that data processing module uses according to the position of the targeted customer's ascending pilot frequency Resource Block in ascending time slot obtained and targeted customer, extract the weight factor a stored in a storage module, acquisition data aX is interference signal, wherein a > 0 and a is real number;

When jamming pattern is scale factor jamming pattern, in a tdd system, data processing module obtains the uplink channel information of non-cooperation recipient to base station end according to descending pilot frequency information, again respectively singular value decomposition is carried out to the up channel of this channel and targeted customer, interference signal matrix is constructed according to singular value decomposition, and extract the scale factor a stored in a storage module, and then obtain the interference signal of each group antenna of non-cooperation recipient;

Interfere information is sent to the signal of targeted customer to base station by interference signal sending module.

Beneficial effect of the present invention is, based on the ascending pilot frequency interference method of random noise by disturbing the ascending pilot frequency of targeted customer, makes non-cooperation recipient compared with without obtaining the downlink information energy of more base stations to targeted customer during Pilot Interference; Ascending pilot frequency interference method based on weight factor is more targeted to the Pilot Interference of targeted customer, can reach the effect identical with the ascending pilot frequency interference method based on random noise with less interference transmitting power; Ascending pilot frequency interference method based on scale factor can regulate the proportion of channel information in base station end uplink channel estimation of non-cooperation recipient and targeted customer more neatly, disturbs transmitting power less simultaneously.

Accompanying drawing explanation

Fig. 1 is method flow schematic diagram of the present invention;

Fig. 2 is the position view of base station, targeted customer and non-cooperation recipient;

Fig. 3 is the lower non-cooperation receiving gain schematic diagram of ascending pilot frequency interference based on random noise;

Fig. 4 is the probabilistic margins schematic diagram meeting destination probability >=90% under three kinds of different ascending pilot frequency interference methods;

Fig. 5 is apparatus structure schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail

Main technical schemes of the present invention is, non-cooperation recipient is according to the targeted customer's information obtained, targeted customer is disturbed to the ascending pilot frequency of base station, make base station end can not correctly estimating target user to the up channel of base station, and then the weighting matrix that change base station end uses in the wave beam forming based on SVD (singular value decomposition) algorithm, the beam direction of transmitting antenna can not be aimed at the mark user, make non-cooperation recipient obtain more downstream signal energy.

Wherein, targeted customer's information of acquisition is divided into 3 kinds of conditions, is specially:

Condition 1 is: non-cooperation recipient only knows the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot;

Condition 2 is: non-cooperation recipient knows the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot and the concrete uplink pilot sequence X of targeted customer's use;

Condition 3 is: non-cooperation recipient knows the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot and the concrete uplink pilot sequence X of targeted customer's use, and user uplink channel information.

Suppose base station, targeted customer, non-cooperation recipient point-blank, as shown in Figure 2, non-cooperation recipient is for targeted customer, and distance base station is farther, this also compares and meets actual scene, wherein d1 is the distance of targeted customer to base station, and d2 is the distance of non-cooperation recipient to base station, and d3 is the distance of non-cooperation recipient to targeted customer.

When targeted customer's distance 100m place, base station, non-cooperation recipient obtains condition 1, when targeted customer sends uplink information, the wherein pilot power normalization of targeted customer, row pilot frequency locations sends the white Gaussian noise burst that frequency domain power is 5dB thereon, now, the SIR (signal interference ratio) that base station end receives is-5dB, obtains result as shown in Figure 3.

In figure 3, abscissa is the beeline of non-cooperation recipient apart from targeted customer, and ordinate is the difference of the SNR of targeted customer and the SNR of non-cooperation recipient.As can be seen from the figure after the ascending pilot frequency interference be subject to based on random noise in targeted customer's pilot tone, little when both SNR difference is not subject to pilot tone compared with targeted customer.Illustrate that the downstream signal energy that targeted customer receives reduces, the downstream signal energy that non-cooperation recipient receives simultaneously increases, and reaches the object that non-cooperation receives.

Meanwhile, as targeted customer's distance base station 100m, target setting:

(1) absolute value of the difference of the SNR of targeted customer and the SNR of non-cooperation recipient is no more than 1.75dB.

(2) pilot tone of targeted customer be interfered after SNR excursion be no more than 2dB.

Obtain result as shown in Figure 4, Fig. 4 is the probabilistic margins figure meeting destination probability >=90% under three kinds of different ascending pilot frequency interference methods, wherein abscissa is uplink interference signal average energy, and ordinate is that targeted customer is apart from non-cooperation recipient during the 100m of base station to the air line distance of targeted customer.As can be seen from the figure when non-cooperation receiving range is identical, based on scale factor ascending pilot frequency interference needed for interference power minimum.Equally, under same disturbance power, the non-cooperation receiving range that the ascending pilot frequency based on scale factor disturbs farthest.

As shown in Figure 5, apparatus of the present invention comprise signal receiving module, data processing module, jamming pattern selection module, interference signal sending module and memory module; Described signal receiving module selects module, memory module and data processing module to be connected with jamming pattern respectively; Described data processing module is connected with interference signal sending module; Wherein,

Described signal receiving module is used for the information of receiving target user;

Described jamming pattern selects module for the targeted customer's Information Selection interference module according to acquisition, and jamming pattern instruction is sent to data processing module; Described jamming pattern comprises random noise disturbance pattern, weight factor jamming pattern and scale factor jamming pattern;

Data processing module carries out interfering data process according to the instruction of jamming pattern, and the interference signal obtained is sent to interference signal sending module; The processing method of described interfering data is:

When jamming pattern is random noise disturbance pattern, data processing module extracts storage frequency domain white Gaussian noise signal in a storage module as interference signal;

When jamming pattern is weight factor jamming pattern, the uplink pilot sequence X that data processing module uses according to the position of the targeted customer's ascending pilot frequency Resource Block in ascending time slot obtained and targeted customer, extract the weight factor a stored in a storage module, acquisition data aX is interference signal, wherein a > 0 and a is real number;

When jamming pattern is scale factor jamming pattern, in a tdd system, data processing module obtains the uplink channel information of non-cooperation recipient to base station end according to descending pilot frequency information, again respectively singular value decomposition is carried out to the up channel of this channel and targeted customer, interference signal matrix is constructed according to singular value decomposition, and extract the scale factor a stored in a storage module, and then obtain the interference signal of each group antenna of non-cooperation recipient;

Interfere information is sent to the signal of targeted customer to base station by interference signal sending module.

Claims (5)

1. the non-cooperation method of reseptance of closed-loop MIMO, is characterized in that:

Non-cooperation recipient is according to the targeted customer's information obtained, targeted customer is disturbed to the ascending pilot frequency of base station, make base station end can not correctly estimating target user to the up channel of base station, and then change the weighting matrix that base station end uses in based on the wave beam forming of singular value decomposition algorithm, the beam direction of transmitting antenna can not be aimed at the mark user, make non-cooperation recipient obtain more downstream signal energy.

2. the non-cooperation method of reseptance of a kind of closed-loop MIMO according to claim 1, it is characterized in that, targeted customer's information of described acquisition is the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot, to the concrete grammar that targeted customer disturbs to the ascending pilot frequency of base station be then: non-cooperation recipient is when targeted customer sends uplink information, and row pilot frequency locations sends frequency domain white Gaussian noise signal and disturbs thereon.

3. the non-cooperation method of reseptance of a kind of closed-loop MIMO according to claim 1, it is characterized in that, targeted customer's information of described acquisition is the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot and the uplink pilot sequence X of targeted customer's use, to the concrete grammar that targeted customer disturbs to the ascending pilot frequency of base station be then: non-cooperation recipient is when targeted customer sends uplink information, row pilot frequency locations sends with the pilot frequency sequence aX identical with targeted customer of certain weight factor thereon, wherein a > 0 and a is real number.

4. the non-cooperation method of reseptance of a kind of closed-loop MIMO according to claim 1, it is characterized in that, targeted customer's information of described acquisition is the uplink channel information of the position of targeted customer's ascending pilot frequency Resource Block in ascending time slot, uplink pilot sequence X that targeted customer uses and targeted customer, then to the concrete grammar that targeted customer disturbs to the ascending pilot frequency of base station be:

Non-cooperation recipient is by descending pilot frequency information, obtain the descending channel information of base station end to non-cooperation recipient, again by the up-downgoing channel reciprocity of TDD system, obtain the uplink channel information of non-cooperation recipient to base station end, again respectively singular value decomposition is carried out to the up channel of this channel and targeted customer, and construct interference signal matrix according to singular value decomposition so change non-cooperation recipient each group antenna interference pilot tone, when targeted customer sends uplink information, row pilot frequency locations sends this Pilot Interference signal thereon.

5. the non-cooperation receiving system of closed-loop MIMO, is characterized in that, comprises signal receiving module, data processing module, jamming pattern selection module, interference signal sending module and memory module; Described signal receiving module selects module, memory module and data processing module to be connected with jamming pattern respectively; Described data processing module is connected with interference signal sending module; Wherein,

Described signal receiving module is used for the information of receiving target user;

Described jamming pattern selects module for the targeted customer's Information Selection interference module according to acquisition, and jamming pattern instruction is sent to data processing module; Described jamming pattern comprises random noise disturbance pattern, weight factor jamming pattern and scale factor jamming pattern;

Data processing module carries out interfering data process according to the instruction of jamming pattern, and the interference signal obtained is sent to interference signal sending module; The processing method of described interfering data is:

When jamming pattern is random noise disturbance pattern, data processing module extracts storage frequency domain white Gaussian noise signal in a storage module as interference signal;

When jamming pattern is weight factor jamming pattern, the uplink pilot sequence X that data processing module uses according to the position of the targeted customer's ascending pilot frequency Resource Block in ascending time slot obtained and targeted customer, extract the weight factor a stored in a storage module, acquisition data aX is interference signal, wherein a > 0 and a is real number;

When jamming pattern is scale factor jamming pattern, in a tdd system, data processing module obtains the uplink channel information of non-cooperation recipient to base station end according to descending pilot frequency information, again respectively singular value decomposition is carried out to the up channel of this channel and targeted customer, interference signal matrix is constructed according to singular value decomposition, and extract the scale factor a stored in a storage module, and then obtain the interference signal of each group antenna of non-cooperation recipient;

Interfere information is sent to the signal of targeted customer to base station by interference signal sending module.