CN105979526A - Biding method for spectrum auction of cognitive distributed antenna system - Google Patents

Abstract

The invention discloses a biding method for a spectrum auction of a cognitive distributed antenna system. The method comprises the following steps: S1, building a spectrum auction model of the cognitive distributed antenna system, wherein a PU (Primary User) and an SU (Secondary User) coexist in the system, the SU obtains an authorized frequency band of the PU through the auction, and performs communications through distributed antennas, the SU is served by different distributed antennas, and antennas capable of providing better services for the SU can be selected through antenna selection; S2, controlling the throughput by adjusting the transmitting power and a precoding vector of the SU in order to adjust and control biding of the SU; and S3, controlling and adjusting the throughput of the SU by building a target combining the antenna selection, precoding and power allocation optimization for the cognitive distributed antenna system, and optimizing the transmitting power and a precoding weight after the antenna selection. Through adoption of the biding method, a more detailed and more practical biding way is provided. Both the PU and SU are considered, so that the SU can bid the frequency band, and normal communications of the PU can be ensured.

Description

A kind of bid methodologies of the spectrum auction of cognitive distributing antenna system

Technical field

The present invention relates to cognitive radio technology field, the spectrum auction of a kind of cognitive distributing antenna system Bid methodologies.

Background technology

In the face of radio communication service increase in demand and the contradiction of frequency spectrum resource shortage, the spectrum auction in cognitive radio will The authorized frequency bands that primary user (PU) is had by inch of candle is distributed to time user (SU) and is used, and improves the availability of frequency spectrum.

Spaced antenna, as a kind of multi-antenna technology, can be effectively improved transporting on the premise of not increasing spectral bandwidth Can, improve the availability of frequency spectrum.The existing research for spaced antenna is concentrated mainly on sky line options, channel capacity, sky The aspects such as line position design.

Spaced antenna is electrically coupled with cognition wireless, is placed by antenna dispersion, reduce the distance between SU and base station, Reduce the transmitting power of SU, the interference to primary user PU can be effectively reduced.The technical advantage combined due to both, causes scholar's Pay close attention to.Wendong Ge analyzes light and carries the cognitive radio resource management techniques of spaced antenna, and Juntao Zhao is for base SU system in spaced antenna, it is proposed that the design of spaced antenna position, additionally further through sky line options and power Distribution maximizes the summation speed of SU, but does not but have the research that cognitive distributing antenna system carries out frequency spectrum distribution.Existing In the research of some spectrum auctions, buyer is random given to the bid of frequency band mostly or only considers have with its signal to noise ratio (SNR) Close, do not consider more influence factor.In conjunction with the problems referred to above, the present invention by inch of candle by frequency spectrum in cognitive spaced antenna system It is allocated under system, proposes a kind of bid methodologies carrying out spectrum auction under cognitive distributing antenna system.Cognition can be made SU energy auction under spaced antenna, to frequency band, can guarantee that again the interference to PU is within the scope of limiting.

Summary of the invention

It is an object of the invention to provide the bid methodologies of the spectrum auction of a kind of cognitive distributing antenna system, to solve The problem proposed in above-mentioned background technology.

For achieving the above object, the present invention provides following technical scheme:

The bid methodologies of the spectrum auction of a kind of cognitive distributing antenna system, comprises the following steps that

S1. building cognitive distributing antenna system spectrum auction model, there is PU and SU in system simultaneously, wherein SU passes through Auction is obtained the mandate frequency range of PU and is communicated by spaced antenna, and the transmitting-receiving to SU signal is responsible for by spaced antenna, logical Crossing center processing unit be controlled signal and process, SU, by different distributions formula antenna serves, can be selected by sky line options The antenna of preferably service is provided for SU；

S2.SU considers that authorized frequency bands is bid by its handling capacity factor obtained under spaced antenna, by adjusting The transmitting power of whole SU and precoding vector, control handling capacity, and then adjust and the bid of control SU, cognitive spaced antenna end Signal to be transmitted is x=[x₁,x₂,...,x_K], the emission signal vector obtaining time base station after precoding is X=FPx, its Middle F=[f₁,f₂,...,f_K] it is pre-coding matrix,For launching power matrix, p_kFor SUk Transmitting power, after channel sends, the Signal to Interference plus Noise Ratio (SINR) of available SUk and handling capacity；

S3. the SUk bid v to frequency band n is made_knIt is defined as v_kn=γ_knB_nlog₂(1+SINR_k), wherein γ_knFor SUk to frequency With the preference degree of n, B_nFor the bandwidth of frequency band n, select and precoding by cognitive distributing antenna system is set up joint antenna And power distribution optimization aim controls and adjusts SU handling capacity, under some restrictive conditions, set up the target letter optimizing three Number, by being optimized, when transmitting power and the precoding of each SU transmitting power and precoding weight after sky line options again When weight reaches Nash Equilibrium, i.e. available optimum handling capacity, thus SU can be made to obtain the most reasonably and bid, can guarantee that its energy The frequency band clapping optimum, and ensure not affect the communication of PU.

Preferably, after in described step S2, signal channel sends, the SINR of SUk is

Wherein α=[α_1,1,α_1,2,...,α_KM] table Show antenna selective factor B vector, if SUk selects spaced antenna m, then α_km=1, otherwise α_km=0, H_km=ω_kml_kmh_kmFor distribution The channel of formula antenna m to SUk, including shadow fading ω_km, path loss l_kmAnd small-scale fading channel h_km, f_kmFor SUk and sky Precoding weight between line m, p_mFor launching power, x_kFor being transmitted to the signal of SUk, p_pFor the transmitting power of primary user, g_kIt is main User is to the channel coefficients of SUk, n_kBeing 0 for average, variance isInterchannel noise.

Preferably, in described step S2, the handling capacity of SUk is C=log₂(1+SINR_k)。

Preferably, described step S3 is set up under some restrictive conditions combined optimization sky line options, precoding and transmitting The object function of power and restrictive condition are

$C=\underset{\{{\mathrm{\α}}_{km},p_m,f_{km}\}}{max}\underset{k=1}{\overset{K}{\Σ}}{\log }_2(1+{\mathrm{SINR}}_k)$

$s.t\left\{\begin{array}{c}\underset{m=1}{\overset{M}{\Σ}}{p}_m|H_{km}{f}_{km}{|}^2\≤I_{th}\\ \underset{m=1}{\overset{M}{\Σ}}{p}_m\≤p_T\\ {\mathrm{SINR}}_k\≥{\mathrm{\γ}}_{\min ,k}\\ {\mathrm{\α}}_{km}\∈\{0,1\}\\ \underset{k=1}{\overset{K}{\Σ}}{\mathrm{\α}}_{km}\≤1,k=1,2,...,K\\ \underset{m=1}{\overset{M}{\Σ}}{\mathrm{\α}}_{km}\≤1,m=1,2,...,M\end{array}\right.$

Wherein I_thFor the interference threshold limit of PU, P_TFor general power limits value, γ_min,kFor the SINR demand threshold of SU, its In middle object function, Section 1 is that SU is less than threshold value I to the interference of PU_th, Section 2 is that the general power of all SU limits less than power Threshold value P processed_T, Section 3 is the SINR requirements γ of SU to be met_min,k, Section 5 represents every spaced antenna and only services one SU, Section 6 represents that each SU only needs a spaced antenna.

Compared with prior art, the invention has the beneficial effects as follows: the present invention, make spectrum auction combine concrete technology field Scape, than existing spectrum auction method closer to reality, and the side of random given bid relative in existing spectrum auction Formula, the bid mode of the present invention more specifically, reality of more fitting, it is contemplated that PU and SU two aspect, SU can be made to clap to obtain frequency band, again can Ensure the proper communication of PU.

Accompanying drawing explanation

Fig. 1 is cognition distributing antenna system model schematic of the present invention；

Fig. 2 be the present invention be cognitive distributing antenna system spectrum auction illustraton of model.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.

Referring to Fig. 1-2, the present invention provides a kind of technical scheme:

The bid methodologies of the spectrum auction of a kind of cognitive distributing antenna system, comprises the following steps that

S1. building cognitive distributing antenna system spectrum auction model, there is PU and SU in system simultaneously, wherein SU passes through Auction is obtained the mandate frequency range of PU and is communicated by spaced antenna, and the transmitting-receiving to SU signal is responsible for by spaced antenna, logical Crossing center processing unit be controlled signal and process, SU, by different distributions formula antenna serves, can be selected by sky line options The antenna of preferably service is provided for SU；

S2.SU considers that authorized frequency bands is bid by its handling capacity factor obtained under spaced antenna, by adjusting The transmitting power of whole SU and precoding vector, control handling capacity, and then adjust and the bid of control SU, cognitive spaced antenna end Signal to be transmitted is x=[x₁,x₂,...,x_K], the emission signal vector obtaining time base station after precoding is X=FPx, its Middle F=[f₁,f₂,...,f_K] it is pre-coding matrix,For launching power matrix, p_kFor SUk's Launch power, after channel sends, the Signal to Interference plus Noise Ratio (SINR) of available SUk and handling capacity, signal channel in step S2 After transmission, the SINR of SUk is

Wherein α=[α_1,1,α_1,2,...,α_KM] table Show antenna selective factor B vector, if SUk selects spaced antenna m, then α_km=1, otherwise α_km=0, H_km=ω_kml_kmh_kmFor distribution The channel of formula antenna m to SUk, including shadow fading ω_km, path loss l_kmAnd small-scale fading channel h_km, f_kmFor SUk and sky Precoding weight between line m, p_mFor launching power, x_kFor being transmitted to the signal of SUk, p_pFor the transmitting power of primary user, g_kIt is main User is to the channel coefficients of SUk, n_kBeing 0 for average, variance isInterchannel noise, in step S2, the handling capacity of SUk is C= log₂(1+SINR_k)；

S3. the SUk bid v to frequency band n is made_knIt is defined as v_kn=γ_knB_nlog₂(1+SINR_k), wherein γ_knFor SUk to frequency With the preference degree of n, B_nFor the bandwidth of frequency band n, select and precoding by cognitive distributing antenna system is set up joint antenna And power distribution optimization aim controls and adjusts SU handling capacity, under some restrictive conditions, set up the target letter optimizing three Number, by being optimized, when transmitting power and the precoding of each SU transmitting power and precoding weight after sky line options again When weight reaches Nash Equilibrium, i.e. available optimum handling capacity, thus SU can be made to obtain the most reasonably and bid, can guarantee that its energy The frequency band clapping optimum, and ensure not affect the communication of PU, step S3 is set up under some restrictive conditions combined optimization antenna Selecting, precoding and the object function of transmitting power and restrictive condition are

$C=\underset{\{{\mathrm{\α}}_{km},p_m,f_{km}\}}{max}\underset{k=1}{\overset{K}{\Σ}}{\log }_2(1+{\mathrm{SINR}}_k)$

$s.t\left\{\begin{array}{c}\underset{m=1}{\overset{M}{\Σ}}{p}_m|H_{km}{f}_{km}{|}^2\≤I_{th}\\ \underset{m=1}{\overset{M}{\Σ}}{p}_m\≤p_T\\ {\mathrm{SINR}}_k\≥{\mathrm{\γ}}_{\min ,k}\\ {\mathrm{\α}}_{km}\∈\{0,1\}\\ \underset{k=1}{\overset{K}{\Σ}}{\mathrm{\α}}_{km}\≤1,k=1,2,...,K\\ \underset{m=1}{\overset{M}{\Σ}}{\mathrm{\α}}_{km}\≤1,m=1,2,...,M\end{array}\right.$

Wherein I_thFor the interference threshold limit of PU, P_TFor general power limits value, γ_min,kFor the SINR demand threshold of SU, its In middle object function, Section 1 is that SU is less than threshold value I to the interference of PU_th, Section 2 is that the general power of all SU limits less than power Threshold value P processed_T, Section 3 is the SINR requirements γ of SU to be met_min,k, Section 5 represents every spaced antenna and only services one SU, Section 6 represents that each SU only needs a spaced antenna.

First transmitting power and precoding weight are fixed, only carry out a day line options, again to transmitting after sky line options is complete Power and precoding weight are optimized, when the transmitting power of each SU and precoding weight reach Nash Equilibrium, the most available Optimum handling capacity, thus can make SU obtain the most reasonably to bid v_kn=γ_knB_nlog₂(1+SINR_k), both can guarantee that it can be clapped Obtain optimum frequency band, can guarantee that again the communication not affecting PU.

Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, permissible Understand and these embodiments can be carried out multiple change without departing from the principles and spirit of the present invention, revise, replace And modification, the scope of the present invention be defined by the appended.

Claims (4)

1. the bid methodologies of the spectrum auction of a cognitive distributing antenna system, it is characterised in that comprise the following steps that

S1. building cognitive distributing antenna system spectrum auction model, there is PU and SU in system simultaneously, wherein SU passes through auction Obtaining the mandate frequency range of PU and communicated by spaced antenna, transmitting-receiving to SU signal is responsible for by spaced antenna, by Signal is controlled and processes by heart processing unit, and SU, by different distributions formula antenna serves, can be selected as SU by sky line options The antenna of preferably service is provided；

S2.SU considers that authorized frequency bands is bid by its handling capacity factor obtained under spaced antenna, by adjusting SU Transmitting power and precoding vector, control handling capacity, and then adjust and control the bid of SU, cognitive spaced antenna end is pending Penetrating signal is x=[x₁,x₂,...,x_K], the emission signal vector obtaining time base station after precoding is X=FPx, wherein F= [f₁,f₂,...,f_K] it is pre-coding matrix,For launching power matrix, p_kTransmitting for SUk Power, after channel sends, the Signal to Interference plus Noise Ratio (SINR) of available SUk and handling capacity；

S3. the SUk bid v to frequency band n is made_knIt is defined as v_kn=γ_knB_nlog₂(1+SINR_k), wherein γ_knFor SUk to frequency band n's Preference degree, B_nFor the bandwidth of frequency band n, by cognitive distributing antenna system is set up joint antenna selecting and precoding and power Distribution optimization aim controls and adjusts SU handling capacity, sets up the object function optimizing three, pass through under some restrictive conditions Again transmitting power and precoding weight are optimized, when transmitting power and the precoding weight of each SU reach after it line options During Nash Equilibrium, i.e. available optimum handling capacity, thus SU can be made to obtain the most reasonably and bid, can guarantee that it can clap optimum Frequency band, and ensure not affect the communication of PU.

The bid methodologies of the spectrum auction of a kind of cognitive distributing antenna system the most according to claim 1, its feature exists In: after in described step S2, signal channel sends, the SINR of SUk is

Wherein α=[α_1,1,α_1,2,...,α_KM] represent sky Line options factor vector, if SUk selects spaced antenna m, then α_km=1, otherwise α_km=0, H_km=ω_kml_kmh_kmFor distributed sky The channel of line m to SUk, including shadow fading ω_km, path loss l_kmAnd small-scale fading channel h_km, f_kmFor between SUk and antenna m Precoding weight, p_mFor launching power, x_kFor being transmitted to the signal of SUk, p_pFor the transmitting power of primary user, g_kFor primary user To the channel coefficients of SUk, n_kBeing 0 for average, variance isInterchannel noise.

The bid methodologies of the spectrum auction of a kind of cognitive distributing antenna system the most according to claim 1, its feature exists In: in described step S2, the handling capacity of SUk is C=log₂(1+SINR_k)。

The bid methodologies of the spectrum auction of a kind of cognitive distributing antenna system the most according to claim 1, its feature exists In: described step S3 is set up under some restrictive conditions combined optimization sky line options, precoding and the target letter of transmitting power Number and restrictive condition are

$C=\underset{\{{\mathrm{\α}}_{km},p_{m,}{f}_{km}\}}{max}\underset{k=1}{\overset{K}{\Σ}}{\log }_2(1+{\mathrm{SINR}}_k)$

$s.t\left\{\begin{array}{c}\underset{m=1}{\overset{M}{\Σ}}{p}_m{\left|H_{km}{f}_{km}\right|}^2\≤I_{th}\\ \underset{m=1}{\overset{M}{\Σ}}{p}_m\≤p_T\\ {\mathrm{SINR}}_k\≥{\mathrm{\γ}}_{\min ,k}\\ {\mathrm{\α}}_{km}\∈\{0,1\}\\ \underset{k=1}{\overset{K}{\Σ}}{\mathrm{\α}}_{km}\≤1,k=1,2,\mathrm{...},K\\ \underset{m=1}{\overset{M}{\Σ}}{\mathrm{\α}}_{km}\≤1,m=1,2,\mathrm{...},M\end{array}\right.$

Wherein I_thFor the interference threshold limit of PU, P_TFor general power limits value, γ_min,kFor the SINR demand threshold of SU, wherein mesh In scalar functions, Section 1 is that SU is less than threshold value I to the interference of PU_th, Section 2 is that the general power of all SU is less than Power Limitation threshold Value P_T, Section 3 is the SINR requirements γ of SU to be met_min,k, Section 5 represents every spaced antenna and only services a SU, Section 6 represents that each SU only needs a spaced antenna.