CN109890075A - A kind of suppressing method of extensive mimo system pilot pollution, system - Google Patents
A kind of suppressing method of extensive mimo system pilot pollution, system Download PDFInfo
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Abstract
The invention discloses a kind of suppressing methods of extensive mimo system pilot pollution, system, belong to wireless communication technology field, which includes: that S1. finds out the large-scale fading factor between terminal and base station；S2. the antenna number for setting each base station of this cell tends to be infinite, obtains the Signal to Interference plus Noise Ratio of each terminal；S3. ascending order arrangement is carried out to each terminal according to the size of Signal to Interference plus Noise Ratio；S4. the power partition coefficient of each terminal after sorting is obtained；S5. the Signal to Interference plus Noise Ratio and power system capacity of each terminal after distributing signal transmission power are calculated.The present invention is based on fix power allocation algorithms, in the case where algorithm complexity is very low, by terminal distribution one higher signal transmission power poor to channel quality, the communication performance of extensive mimo system edge termination is improved well, improves the fairness of system integrated communication.
Description
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of inhibition side of extensive mimo system pilot pollution
Method, system.
Background technique
With the development of the times, the 5th third-generation mobile communication technology is come into being, in user experience rate, peak rate, frequency
Spectrum efficiency, time delay etc. have higher requirement.MIMO technology in order to meet these requirements, as one of 5G key technology
It needs constantly to study and update.2010, the researcher of AT&T Labs, the U.S. took the lead in proposing the concept of extensive MIMO,
Based on existing MIMO technology, several hundred or even thousands of antennas are configured in base station, utilize sky provided by extensive antenna
Between freedom degree, improve frequency spectrum resource utilization efficiency significantly, solve this problem of frequency spectrum resource growing tension.It is same with this
When, using diversity gain and array gain provided by the extensive antenna configuration in base station, can be obviously improved user and base station it
Between the power efficiency that communicates.
In the research of extensive mimo system, base station is generally according to uplink and downlink channel in coherence time same in TTD mode
Reciprocity, utilize terminal send uplink pilot signal carry out channel estimation.But since the limited amount of orthogonal guide frequency is in letter
The relevant duration in road, and in order to guarantee to send more uplink and downlink valid data, extensive MIMO in certain relevant duration
System generally uses full multiplexed pilot scheduling strategy, i.e. same group of orthogonal guide frequency is multiplexed completely by the terminal of all cells.This
Strategy is multiplexed interfering with each other between the terminal generation signal of same pilot tone, i.e. the pilot pollution problem between resulting in different community,
The pilot pollution problem has seriously affected base station to the accuracy of channel estimation, and it is further to become the extensive mimo system performance of restriction
The bottleneck of promotion.
Summary of the invention
For the pilot pollution problem of extensive mimo system in the prior art, the purpose of the present invention is to provide a kind of big
The suppressing method of scale mimo system pilot pollution, system, the fairness communicated from system entirety terminal consider, in operation complexity
It spends in alap situation, to one higher signal transmission power of terminal distribution that channel quality is poor, to improve channel
The communication quality of second-rate terminal.
In order to achieve the above object, the present invention the following technical schemes are provided:
The suppressing method of this extensive mimo system pilot pollution provided by the invention, comprising the following steps:
S1. extensive MIMO cell system model is built, calculates separately out each terminal to this cell using the cosine law
The distance between base station and neighboring community are multiplexed the terminal of same pilot tone the distance between to the base station, so find out terminal with
The large-scale fading factor between base station；
S2. the antenna number for setting each base station of this cell tends to be infinite, obtains the Signal to Interference plus Noise Ratio of each terminal；
S3. ascending order arrangement is carried out to each terminal according to the size of Signal to Interference plus Noise Ratio；
S4. the power partition coefficient of each terminal after sorting is obtained；
S5. the Signal to Interference plus Noise Ratio and power system capacity of each terminal after distributing signal transmission power are calculated.
Preferably, in step S1, extensive MIMO cell system model are as follows: regular hexagon cellular cell model is used,
Be dispersed with uniformly randomly in each cell K terminal (centered on base station, radius rhCircle region), base station be located at it is each
Center of housing estate distributed M root antenna (M > > K), the uplink pilot signal that base station is sent within each coherence time by terminal
Estimate channel, and completes signal detection and downlink precoding.
Preferably, the large-scale fading factor meets in step S1:
In formula (1), βiklRepresent k-th of terminal of i-th of cell to the large-scale fading between first of cell base station because
Son, it is made of path loss and shadow fading two parts, ziklFor the stochastic variable for obeying logarithm normal distribution, i.e. 10log10
(zikl)~N (0, σshadow), σshadowFor the standard deviation of normal distribution,K-th of terminal for representing i-th of cell is small to first
The distance between area base station.
Preferably, the Signal to Interference plus Noise Ratio of each terminal meets in step S2:
In formula (2),Represent the Signal to Interference plus Noise Ratio of k-th of user uplink link of i-th of cell, ρklRepresent pilot tone hair
Power is penetrated,Representation signal transmission power, βiklRepresent the large-scale fading factor；
Can be obtained by formula (2), the Signal to Interference plus Noise Ratio of each terminal can approximate representation be this cell terminal to the big ruler between base station
It spends neighboring community in the duplicate ratio of fading factor and is multiplexed the flat of the large-scale fading factor between the terminal to base station of same pilot tone
Side.
Preferably, the power partition coefficient of each terminal is obtained by following manner in step S4:
4.1) power allocation factor is calculated；
In formula (3), a indicates that power allocation factor, 0 < a < 1, K indicate the number of terminals of each cell, and L indicates cell number
The sum of the signal transmission power distribution factor of all terminals of system is set as 1 by mesh, and power allocation factor is according to Geometric Sequence
Mode arrange, wherein the common ratio of Geometric Sequence be a, first term is also a；
According to gained power allocation factor a, the function of each terminal after sequence is successively calculated according to the form of Geometric Sequence
Rate distribution coefficient；
4.2) power partition coefficient of each terminal is calculated；
αkl=a α(k+1)l (4)
In formula (4), a indicates power allocation factor, αklIndicate the power partition coefficient of k-th of terminal of first of cell.
Preferably, distributing the Signal to Interference plus Noise Ratio SINR satisfaction of each terminal after signal transmission power in step S5:
In formula (5), αkiIndicate power partition coefficient, βiklK-th of terminal of i-th of cell is represented to first of cell base station
Between the large-scale fading factor；
The power system capacity of each terminal meets:
Cik=σ log2(1+SINRik) (6)
In formula (6), σ indicates the parameter containing factors such as bandwidth, signal transmission time accountings.
The present invention also provides a kind of inhibition system of extensive mimo system pilot pollution, which includes:
System model unit: for simulating random distribution of the terminal in extensive mimo system, extensive MIMO is obtained
The large-scale fading factor and neighboring community in system between terminal and this cell base station are multiplexed the terminal of same pilot tone to base
The large-scale fading factor between standing, and calculated for Signal to Interference plus Noise Ratio；
Power distributing unit: it is followed successively by and is distributed according to the terminal after Signal to Interference plus Noise Ratio ascending sort according to the form of Geometric Sequence
Transmission power coefficient；
Signal to Interference plus Noise Ratio and system capacity computing unit: transmission power coefficient and the large-scale fading factor after utilizing distribution,
Signal to Interference plus Noise Ratio and power system capacity after calculating separately power distribution.
Compared with prior art, advantageous effects of the invention are as follows:
The present invention provides a kind of suppressing method of extensive mimo system pilot pollution, system, is based on fix power allocation
Algorithm, in the case where algorithm complexity is very low, by emitting to terminal distribution one poor higher signal of channel quality
Power improves the communication performance of extensive mimo system edge termination well, improves the fairness of system integrated communication；
Simulation result shows this method while improving the communication performance of the bad terminal of channel quality, and computation complexity is lower, just
In realization.
Detailed description of the invention
Fig. 1 is the flow chart of the suppressing method of the extensive mimo system pilot pollution of the present invention.
Fig. 2 is extensive mimo system model schematic.
When Fig. 3 is K=2, pilot tone is multiplexed entirely and is tired out using the SINR of all terminals of system when fix power allocation algorithm
Integrate Butut.
When Fig. 4 is K=2, pilot tone is multiplexed entirely and is tired out using the capacity of all terminals of system when fix power allocation algorithm
Integrate Butut.
When Fig. 5 is K=3, pilot tone is multiplexed entirely and is tired out using the SINR of all terminals of system when fix power allocation algorithm
Integrate Butut.
When Fig. 6 is K=4, pilot tone is multiplexed entirely and is tired out using the capacity of all terminals of system when fix power allocation algorithm
Integrate Butut.
Specific embodiment
The present invention program is further elaborated with attached drawing combined with specific embodiments below.
A kind of suppressing method of extensive mimo system pilot pollution of the present embodiment, comprising the following steps:
Step 1: building extensive MIMO cell system model, each terminal is calculated separately out to originally using the cosine law
The distance between cell base station and neighboring community are multiplexed the terminal of same pilot tone the distance between to the base station, and then find out end
The large-scale fading factor between end and base station:
In extensive mimo system, generally using regular hexagon cellular cell model (as shown in Fig. 2, using 7 cell moulds
Type), be dispersed in each cell uniformly randomly K terminal (centered on base station, radius rhCircle region), base station is located at
Each center of housing estate distributed M root antenna (M > > K), the ascending pilot frequency that base station is sent within each coherence time by terminal
Signal estimates channel, and completes signal detection and downlink precoding；
In the present embodiment, the same pilot tone of all cell reuses in each start time coherence time, while sending uplink
Pilot frequency sequence, the large-scale fading factor meet:
In formula (1), βiklRepresent k-th of terminal of i-th of cell to the large-scale fading between first of cell base station because
Son, it is made of path loss and shadow fading two parts, ziklFor the stochastic variable for obeying logarithm normal distribution, i.e. 10log10
(zikl)~N (0, σshadow), σshadowFor the standard deviation of normal distribution,K-th of terminal for representing i-th of cell is small to first
The distance between area base station can establish coordinate system and be solved with the cosine law；
Step 2: the antenna number for setting each base station of this cell tends to be infinite, the Signal to Interference plus Noise Ratio of each terminal is obtained, each
The Signal to Interference plus Noise Ratio of terminal meets:
In formula (2),Represent the Signal to Interference plus Noise Ratio of k-th of user uplink link of i-th of cell, ρklRepresent pilot tone hair
Power is penetrated,Representation signal transmission power, βiklRepresent the large-scale fading factor；
Can be obtained by formula (2), the Signal to Interference plus Noise Ratio of each terminal can approximate representation be this cell terminal to the big ruler between base station
It spends neighboring community in the duplicate ratio of fading factor and is multiplexed the flat of the large-scale fading factor between the terminal to base station of same pilot tone
Side；
Step 3: the size according to Signal to Interference plus Noise Ratio carries out ascending order arrangement to each terminal, sorts more forward, illustrate the terminal
Signal quality is poorer, needs to distribute a higher power allocation factor:
The present invention improves the communication performance of the poor terminal of channel quality by being allocated to signal transmission power, is
Convenient for processing, pilot power is set as unified first, then using the calculated Signal to Interference plus Noise Ratio of the large-scale fading factor to all
Terminal carries out ascending order arrangement；
Step 4: obtaining the power partition coefficient of each terminal after sequence:
4.1) power allocation factor is calculated；
In formula (3), a indicates that power allocation factor, 0 < a < 1, K indicate the number of terminals of each cell, and L indicates cell number
The sum of the signal transmission power distribution factor of all terminals of system is set as 1 by mesh, and power allocation factor is according to Geometric Sequence
Mode arrange, wherein the common ratio of Geometric Sequence be a, first term is also a；
According to gained power allocation factor a, the function of each terminal after sequence is successively calculated according to the form of Geometric Sequence
Rate distribution coefficient；
4.2) power partition coefficient of each terminal is calculated；
αkl=a α(k+1)l (4)
In formula (4), a indicates power allocation factor, αklIndicate the power partition coefficient of k-th of terminal of first of cell；
Step 5: calculating the Signal to Interference plus Noise Ratio and power system capacity of each terminal after distribution signal transmission power:
Before with fix power allocation algorithm, the pilot transmission power of each terminal to be united first convenient for calculating
As soon as being ρ, we are only with consideration transmission power distribution in this way, it is assumed that system total power P, then the signal of each terminal emits function
Rate coefficient can indicate are as follows:
In this way formula (2) can be converted to the formula (6) for containing only power partition coefficient and the large-scale fading factor:
In formula (6), αkiIndicate power partition coefficient, βiklK-th of terminal of i-th of cell is represented to first of cell base station
Between the large-scale fading factor；
The power system capacity of each terminal meets:
Cik=σ log2(1+SINRik) (7)
In formula (7), σ indicates the parameter containing factors such as bandwidth, signal transmission time accountings.
The present embodiment also provides a kind of inhibition system of extensive mimo system pilot pollution, which includes:
System model unit: for simulating random distribution of the terminal in extensive mimo system, extensive MIMO is obtained
The large-scale fading factor and neighboring community in system between terminal and this cell base station are multiplexed the terminal of same pilot tone to base
The large-scale fading factor between standing, and calculated for Signal to Interference plus Noise Ratio；
Power distributing unit: it is followed successively by and is distributed according to the terminal after Signal to Interference plus Noise Ratio ascending sort according to the form of Geometric Sequence
Transmission power coefficient；
Signal to Interference plus Noise Ratio and system capacity computing unit: transmission power coefficient and the large-scale fading factor after utilizing distribution,
Signal to Interference plus Noise Ratio and power system capacity after calculating separately power distribution.
Fig. 3~6 are Performance Simulation Results figures of the invention, as can be seen from the figure by opposing with full multiplexed pilot system
Than discovery, after power distribution algorithm is added, when K=2, the probability of each terminal SINR < 0 reduces about 6%, and handling capacity per second <
The probability of 1Mbps reduces about 7%；When K=3, the probability of each terminal SINR < -10 reduces about 4%, handling capacity < 1Mbps per second
Probability reduce about 5%.Therefore, which has positive effect to edge cell communication performance is improved.
As can be seen from the above embodiments, the present invention can be used to be effectively improved extensive mimo system communication quality bad
The communication performance of terminal improves the fairness of system communication, in addition, the algorithm has very low complexity, it is easy to accomplish.
Concentration embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (7)
1. a kind of suppressing method of extensive mimo system pilot pollution, which comprises the following steps:
S1. extensive MIMO cell system model is built, calculates separately out each terminal to this cell base station using the cosine law
The distance between and neighboring community be multiplexed the terminal of same pilot tone the distance between to the base station, and then find out terminal and base station
Between the large-scale fading factor；
S2. the antenna number for setting each base station of this cell tends to be infinite, obtains the Signal to Interference plus Noise Ratio of each terminal；
S3. ascending order arrangement is carried out to each terminal according to the size of Signal to Interference plus Noise Ratio；
S4. the power partition coefficient of each terminal after sorting is obtained；
S5. the Signal to Interference plus Noise Ratio and power system capacity of each terminal after distributing signal transmission power are calculated.
2. the suppressing method of extensive mimo system pilot pollution according to claim 1, which is characterized in that in step S1,
Extensive MIMO cell system model are as follows: use regular hexagon cellular cell model, be dispersed with K uniformly randomly in each cell
A terminal (centered on base station, radius rhCircle region), base station is located at each center of housing estate, distributed M root antenna (M >
> K), base station within each coherence time by terminal send uplink pilot signal estimate channel, and complete signal detection and
Downlink precoding.
3. the suppressing method of extensive mimo system pilot pollution according to claim 1, which is characterized in that in step S1,
The large-scale fading factor meets:
In formula (1), βiklK-th of terminal of i-th of cell is represented to the large-scale fading factor between first of cell base station, it
It is made of path loss and shadow fading two parts, ziklFor the stochastic variable for obeying logarithm normal distribution, i.e. 10log10(zikl)
~N (0, σshadow), σshadowFor the standard deviation of normal distribution,K-th of terminal of i-th of cell is represented to first of cell base
The distance between stand.
4. the suppressing method of extensive mimo system pilot pollution according to claim 1, which is characterized in that in step S2,
The Signal to Interference plus Noise Ratio of each terminal meets:
In formula (2),Represent the Signal to Interference plus Noise Ratio of k-th of user uplink link of i-th of cell, ρklRepresent pilot transmission function
Rate,Representation signal transmission power, βiklRepresent the large-scale fading factor.
5. the suppressing method of extensive mimo system pilot pollution according to claim 1, which is characterized in that in step S4,
The power partition coefficient of each terminal, is obtained by following manner:
4.1) calculate power allocation factor；
In formula (3), a indicates that power allocation factor, 0 < a < 1, K indicate the number of terminals of each cell, and L indicates number of cells, will
The sum of the signal transmission power distribution factor of all terminals of system is set as 1, and power allocation factor is according to the side of Geometric Sequence
Formula arrangement, wherein the common ratio of Geometric Sequence is a, and first term is also a；
According to gained power allocation factor a, the power point of each terminal after sequence is successively calculated according to the form of Geometric Sequence
Distribution coefficient；
4.2) power partition coefficient of each terminal is calculated；
αkl=a α(k+1)l (4)
In formula (4), a indicates power allocation factor, αklIndicate the power partition coefficient of k-th of terminal of first of cell.
6. the suppressing method of extensive mimo system pilot pollution according to claim 1, which is characterized in that in step S5,
The Signal to Interference plus Noise Ratio SINR of each terminal meets after distribution signal transmission power:
In formula (5), αkiIndicate power partition coefficient, βiklK-th of terminal of i-th of cell is represented between first of cell base station
The large-scale fading factor；
The power system capacity of each terminal meets:
Cik=σ log2(1+SINRik) (6)
In formula (6), σ indicates the parameter containing factors such as bandwidth, signal transmission time accountings.
7. a kind of inhibition system of extensive mimo system pilot pollution, the system include:
System model unit: for simulating random distribution of the terminal in extensive mimo system, extensive mimo system is obtained
The large-scale fading factor and neighboring community between middle terminal and this cell base station be multiplexed same pilot tone terminal to base station it
Between the large-scale fading factor, and for Signal to Interference plus Noise Ratio calculate；
Power distributing unit: it is followed successively by the form distribution transmitting according to the terminal after Signal to Interference plus Noise Ratio ascending sort according to Geometric Sequence
Power coefficient；
Signal to Interference plus Noise Ratio and system capacity computing unit: using the transmission power coefficient and the large-scale fading factor after distribution, respectively
Signal to Interference plus Noise Ratio and power system capacity after calculating power distribution.
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