CN101394255B - Two-user collaboration communication method in multi-user wireless network - Google Patents
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Abstract
The invention discloses a method for two users to carry out the cooperative communication in the multiuser wireless network. The method comprises the following step: 1) a partner terminal is chosen for a user terminal by an objective terminal; 2) in the first frame, local coding data are modulated to the in-phase component and then sent to the objective terminal by the user terminal, and the dataare decoded and then checked the validity thereof by the partner terminal; 3) in the second frame, the local and the delay coding data are respectively modulated to the in-phase and orthogonal components and sent by the partner terminal, and the local data are decoded and checked by the user terminal; 4) in the third frame, the local and the delay coding data are respectively modulated to the in-phase and orthogonal components and sent by the user terminal, and the local data are decoded and checked by the partner terminal; 5) in the following frame numbering odds and evens, the third and thefourth steps are respectively repeated; and 6) in the last frame, the delay data are sent by the user terminal or the partner terminal. The method has the advantage that the utilization ratio of the channel and power recourses is high, therefore, the method is applicable to the reliable data transmission in the wireless network.
Description
Technical field
The invention belongs to wireless communication field, particularly relate to two users' collaboration communication method in a kind of multi-user wireless network.
Background technology
The multi-antenna diversity technology can effectively be resisted the influence of multipath fading in the wireless network, improves network capacity, improves systematic function.In wireless communication systems such as cellular mobile communication, ad hoc and wireless sensor network, terminal equipment is realized comparatively difficulty of many antennas owing to be subjected to the restriction of factors such as power consumption, volume and hardware complexity.In recent years, a kind of extension of multi-antenna technology-collaboration communication technology has caused the extensive concern of all circles.The collaboration communication technology makes the single antenna terminal under the multi-user environment share resource each other according to certain way, forms virtual multiple antenna transmitter to obtain emission diversity gain.The collaboration communication technology is a kind of allocation of radio resources solution of low-cost high-efficiency, provides a new approach for multi-antenna technology moves towards practicability, very likely becomes network important in the next generation wireless communication net and forms framework.
In the user collaboration diversity system, because the introducing of relay transmission, user's signal need experience the user to relaying when arriving the base station, and promptly the channeling and trunking of cooperative partner is to the channel of base station.Send information as cooperative partner to the base station mutually if stipulate two users, the selection of cooperative partner will be the primary factor that influences the cooperative diversity system performance.Secondly, after collaboration user is to formation, because with there being information to send per family to the base station, how under limited system resource condition, insert as realization multi-user informations such as frequency/time slot/code words, make resource utilization, coding gain and the diversity gain of system maximize, promptly the user collaboration communication mode is another problem in the cooperative diversity system.At last, because the restriction of transmitting power and the demand of QoS of customer QoS, the user also will carry out power division adaptively according to the decline and the interfere information of current system between this locality and partner's signal, thereby makes full use of limited system resource as far as possible, improves resource utilization ratio.Therefore, cooperation partner selection, collaboration communication mode and adaptive power assignment problem just become research contents important in the user collaboration diversity system.
In the tradition cooperative diversity system, typically based on two users of time-division scene of cooperating be: each user is used for sending local information with half of self available time slot, and second half is used for sending partner's trunk information.Obviously, this type of cooperation resource distribution mode is not optimum, can cause the rate loss of system bandwidth expansion and collaboration user.Therefore, how to design the important research direction that the resource distribution mode of cooperating more efficiently is the collaboration diversity field.
Erik G.Larsson in 2005 etc. have proposed a kind of collaboration communication method based on superimposed modulation in " Cooperative Transmit DiversityBased on Superposition Modulation " (" based on the cooperation transmit diversity of superimposed modulation ") that " IEEE Communication Letters " (" international institute of electrical and electronic engineers communication wall bulletin ") (volume September the 9th in 2005) delivered.This method superposes user's constellation modulation signal in theorem in Euclid space, make each user send local information and partner's trunk information simultaneously.Therefore this method can not cause the cooperative system bandwidth to increase, and can make full use of channel resource, is a kind of resource distribution mode of cooperating efficiently.Power resource allocation between this locality and trunk information also has been described to the influence of systematic function in the literary composition, but has not related to the method for power division.In addition, because the local information that the user sends adopts identical check digit with the trunk information that the partner sends, thereby influenced the raising of systematic function.
V.Mahinthan in 2007 etc. have proposed a kind of collaboration communication method based on orthogonal signalling in " ACooperativeDiversity Scheme Based on Quadrature Signaling " (" based on the collaboration diversity mechanism of orthogonal signalling ") that " IEEE Trans.On Wireless Communications " (" international institute of electrical and electronic engineers radio communication transactions ") (volume January the 6th in 2007) are delivered.This method is utilized the homophase and the quadrature component of QPSK modulation, makes each user can send local information and partner's trunk information simultaneously.Therefore this method can not cause the cooperative system bandwidth to increase, and is a kind of resource distribution mode of cooperating efficiently yet.This method can be regarded as a kind of superimposed modulation collaboration communication method based on signal in orthogonal, and by the orthogonality between homophase and the quadrature component, the user can isolate the local information that the partner sends with lower complexity from the buddy information that receives.But this article has only been discussed not coded system and traditional constant power distribution method, how not to utilize adaptive channel encoding and optimized power allocation method to come further elevator system performance in system and relate to.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, two users in a kind of multi-user wireless network are provided collaboration communication method, to make full use of system resources such as channel and transmitted power, make the terminal of cooperating obtain maximum space diversity gain and coding gain, thereby reduce cooperation expense, raising systematic function and the level of resources utilization.
The technical scheme that realizes the object of the invention is: homophase and the quadrature component of utilizing two-dimentional constellation modulation signal, make each user send local information and partner's trunk information simultaneously, utilize the power factor of purpose terminal feedback that the power resource of distributing to local and trunk information is optimized configuration, make the cooperation terminal obtain maximum space diversity gain and coding gain, guarantee the transmission quality of system.Concrete steps are as follows:
(1) wishes that first user terminal (A) that carries out cooperation transmission sends request to purpose terminal (D), in current multi-user wireless network, select a terminal with first user terminal (A) close together as the partner by the purpose terminal, i.e. second user terminal (B);
(2) in first frame of cooperation transmission, first user terminal (A) is encoded local data and chnnel coding through cyclic redundancy check (CRC) successively, and send to purpose terminal (D) after being modulated to in-phase component, purpose terminal (D) and second user terminal (B) receive the data that first user terminal (A) sends simultaneously; Second user terminal (B) carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness;
(3) in second frame of cooperation transmission, second user terminal (B) sends local data, and assist first user terminal (A) to send data, purpose terminal (D) and first user terminal (A) receive the data that second user terminal (B) sends simultaneously, first user terminal (A) carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness;
(4) in the 3rd frame of cooperation transmission, first user terminal (A) sends local data, and assists second user terminal (B) to send data, and purpose terminal (D) and second user terminal (B) receive the data that first user terminal (A) sends simultaneously; Second user terminal (B) carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness;
(5) repeating step (3) is finished in the even frame k of cooperation transmission, local data that second user terminal (B) will send and the data of assisting first user terminal (A) to send, k 〉=4;
(6) repeating step (4) is finished in the odd-numbered frame l of cooperation transmission, local data that first user terminal (A) will send and the data of assisting second user terminal (B) to send, l 〉=3;
(7) in the last frame of cooperation transmission, first user terminal (A) assists second user terminal (B) to send data, or second user terminal (B) assists first user terminal (A) to send data.
The present invention has following advantage:
1. the present invention is owing to utilize the homophase of two-dimensional modulation signal and the information that quadrature component sends local and partner simultaneously, do not need the expanding system bandwidth during cooperation, realized compromise consideration to algorithm complex and performance gain, reduced system complexity, performance cost has stronger practicality than high;
2. the present invention is because in conjunction with chnnel coding and adaptive power control, this two users' collaboration communication can automatically switch between collaboration communication pattern and non-collaboration communication pattern, thereby can realize when the user is in the collaboration communication pattern, the power factor that adopts the purpose terminal to feed back to is controlled the power between this locality and the trunk information, when the user is in non-collaboration communication pattern, give local information with whole power division;
3. the present invention has not only improved transmission quality, and has made limited unlimited resources obtain effective utilization owing to adopt by the power between this locality and trunk information being carried out the self adaptation distribution;
4. because power distribution method of the present invention and chnnel coding are independence, and its power is optimized distribution, thereby can to obtain maximum performance gain be 1.5dB, and the optimal power factor of trying to achieve according to coded system not can be directly applied to coded system;
5. because the multi-user's access control among the present invention does not rely on concrete access protocol, both can adopt time division multiple access access TDMA, frequency division multiple access access FDMA and the code division multiple access access CDMA of present maturation to carry out user's access, and also can adopt other similar access way such as OFDM to insert OFDMA and carry out user's access.
Description of drawings
Fig. 1. be collaboration communication flow chart of the present invention;
Fig. 2. be existing two users' cooperation communication system illustraton of model;
Fig. 3. be collaboration communication Principle of Process figure of the present invention;
Fig. 4. be the collaboration communication Principle of Process figure of the present invention when adopting convolutional encoding;
Fig. 5. be that the present invention adopts the low-density checksum LDPC collaboration communication Principle of Process figure in when coding.
Fig. 6. be the cooperate power division Principle of Process figure of terminal of the present invention.
Embodiment
With reference to the accompanying drawings and in conjunction with the embodiments the present invention is further described.
With reference to Fig. 1, concrete steps of the present invention are as follows:
Step 1: select partner terminal.
In multi-user wireless network shown in Figure 2, hope is carried out first user terminal A of cooperation transmission and is sent request to the purpose terminal D, in current network, select a terminal with the first user terminal A close together as the partner by the purpose terminal D, i.e. the second user terminal B.This two users' cooperation communication system model as shown in Figure 2.Wherein first user terminal A and the second user terminal B are because the restriction of factors such as volume, power consumption and hardware complexity separately can only be disposed single antenna; The purpose terminal D can dispose one or more antenna.Multi-user's access control that the purpose terminal D adopts is that time division multiple access inserts TDMA, or frequency division multiple access access FDMA, or code division multiple access access CDMA, or OFDM inserts OFDMA.First user terminal A and the second user terminal B be partner terminal each other, shares each other channel and resource such as transmitted power, forms virtual multiple antenna transmitter to the purpose terminal transmits information, with the acquisition emission diversity gain.
Step 2: finish in first frame of cooperation transmission data transmission, reception, decoding and the verifying correctness of first user terminal A.
As shown in Figure 3, first user terminal A is encoded the data that this locality produces and chnnel coding through cyclic redundancy check (CRC) successively, and send to the purpose terminal D after being modulated to in-phase component, at this moment, receive the data that first user terminal A is sent simultaneously by the purpose terminal D and the second user terminal B; The second user terminal B carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness.Wherein said chnnel coding adopts the low-density checksum LDPC sign indicating number, or convolution code, or both cascade systems, and by these sign indicating numbers are punchinged, thereby improve code efficiency; Described data after the decoding being carried out verifying correctness, be by CRC check, or the check matrix of chnnel coding self, or the cascade system of the check matrix of chnnel coding self and CRC check is carried out.
Step 3: finish in second frame of cooperation transmission transmission, reception, decoding and the verifying correctness of the first user terminal A data that the second user terminal B and quilt are cooperated.
As shown in Figure 3, in second frame of cooperation transmission, the second user terminal B encodes the data that this locality produces and chnnel coding through cyclic redundancy check (CRC) successively, and is modulated to in-phase component; The data channel coding method by appointment of assisting first user terminal A to send is encoded again, and be modulated to quadrature component; In-phase component and quadrature component to modulation are carried out power control back to the transmission of purpose terminal D, and promptly the purpose terminal D is by up channel and the mean value calculation in-phase component of terminal room channel and the power division ratio of quadrature component of first user terminal A and the second user terminal B; The power division ratio of calculating is sent to first user terminal A and the second user terminal B by the control channel feedback; First user terminal A and the second user terminal B send its in-phase component and quadrature component respectively according to the power division ratio of feedback.
Fig. 4 has provided when adopting the convolution code of punchinging to carry out chnnel coding, collaboration communication Principle of Process figure.The data that the cooperation terminal produces this locality are earlier sent into the encoder for convolution codes coding of punchinging after encoding through cyclic redundancy check (CRC); Data-modulated after will punching then is to in-phase component; Partner's extracting data in-phase component from receiving again, through the Viterbi decoder decoding, and decoded data are divided into two-way output: the one tunnel sends into decoding verification module carries out the correctness verification, with the input of its result as power control module, the encoder for convolution codes of punchinging is sent on another road, and the data-modulated of deleting punching is to quadrature component; In-phase component and the quadrature component that to carry out at last after power optimization is controlled merge the back transmission.
Fig. 5 has provided when adopting the low-density checksum LDPC sign indicating number of punchinging to carry out chnnel coding, collaboration communication Principle of Process figure.The cooperation terminal is sent into the LDPC code coder of punchinging and is encoded after earlier local data being encoded through cyclic redundancy check (CRC); Data-modulated after then coded data being punched is to in-phase component; Partner's extracting data in-phase component from receiving again, decode through LDPC sign indicating number decoder, decoded data are divided into two-way output: the one tunnel sends into decoding verification module carries out the correctness verification, with the input of its result as power control module, the LDPC code coder of punchinging is sent on another road, extracts data-modulated with coded data punching deletion to quadrature component; In-phase component and the quadrature component that to carry out at last after power optimization distributes merge the back transmission.
Fig. 6 has provided the power division Principle of Process figure of cooperation terminal.For the cooperation terminal, if this terminal is successfully decoded to the data of partner terminal, then power division factor pair this locality and the trunk information that feeds back to according to the purpose terminal carried out power division, automatically enter the collaboration communication pattern, this trunk information is the information that first user terminal A assists the second user terminal B to send, or the second user terminal B assists the information of first user terminal A transmission; If this terminal to the data decode mistake of partner terminal, is then given local information with whole power division, enter non-collaboration communication pattern automatically.For the purpose terminal, need to measure in real time the up channel of two users' terminal and the mean value of terminal room channel signal to noise ratio, and, determine performance objective functions such as the end-to-end frame error rate FER of system, error sign ratio SER or bit error rate BER according to specific modulation system; Obtain the optimal power factor based on specific performance properties target function minimum criteria then, and power factor is fed back to the cooperation terminal by control channel.
Total transmitting power of supposing each user is normalized to 1, and the power division factor of employing is β (0＜β≤0.5), and power promptly local and trunk information is respectively 1-β and β, under certain modulation system, and the end-to-end performance of BER P of the system of derivation
eIt is the function of terminal up channel and terminal room channel average signal-to-noise ratio and power factor.As target function, the optimal power factor under error rate minimum criteria is with this function
s.t.0<β<0.5
With uncoded binary phase shift keying BPSK modulating system is example, the β that calculates under given channel condition
2The value scope is 0.18～0.35.
Step 4: finish in cooperation transmission the 3rd frame transmission, reception, decoding and the verifying correctness of the second user terminal B data that first user terminal A and quilt are cooperated.
As shown in Figure 3, in the 3rd frame of cooperation transmission, first user terminal A is encoded the data that this locality produces and chnnel coding through cyclic redundancy check (CRC) successively, and is modulated to in-phase component; The data channel coding method by appointment of assisting the second user terminal B to send is encoded again, and be modulated to quadrature component; In-phase component and quadrature component to modulation are carried out power control back to the transmission of purpose terminal D, and promptly the purpose terminal D is by up channel and the mean value calculation in-phase component of terminal room channel and the power division ratio of quadrature component of first user terminal A and the second user terminal B; The power division ratio of calculating is sent to first user terminal A and the second user terminal B by the control channel feedback; First user terminal A and the second user terminal B send its in-phase component and quadrature component respectively according to the power division ratio of feedback.The method of its power control as shown in Figure 6.
Step 5: repeating step 3, finish in the even frame k of cooperation transmission local data that the second user terminal B will send and the data of assisting first user terminal A to send, k 〉=4;
Step 6: repeating step 4, finish in the odd-numbered frame l of cooperation transmission local data that first user terminal A will send and the data of assisting the second user terminal B to send, l 〉=3;
Step 7: the relay data of finishing in the cooperation transmission last frame sends.
In the end in the frame, assist to send the data of the second user terminal B, or assist to send the data of first user terminal A by the second user terminal B by first user terminal A.
Above-mentioned steps has been described preferred embodiment of the present invention, and obviously those skilled in the art are by making various modifications and replacement to the present invention with reference to preferred embodiment of the present invention and accompanying drawing, and these modifications and replacement all should fall within protection scope of the present invention.
Claims (4)
1. two users' collaboration communication method in the multi-user wireless network comprises the steps:
(1) wishes that first user terminal (A) that carries out cooperation transmission sends request to purpose terminal (D), in current multi-user wireless network, select a terminal with first user terminal (A) close together as the partner by the purpose terminal, i.e. second user terminal (B);
(2) in first frame of cooperation transmission, first user terminal (A) is encoded local data and chnnel coding through cyclic redundancy check (CRC) successively, and send to purpose terminal (D) after being modulated to in-phase component, purpose terminal (D) and second user terminal (B) receive the data that first user terminal (A) sends simultaneously; Second user terminal (B) carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness;
(3) in second frame of cooperation transmission, second user terminal (B) sends local data, and assist first user terminal (A) to send data, purpose terminal (D) and first user terminal (A) receive the data that second user terminal (B) sends simultaneously, first user terminal (A) carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness:
Described second user terminal (B) sends local data, and assists first user terminal (A) to send data, carries out according to the following procedure:
(3a) second user terminal (B) is encoded local data and chnnel coding through cyclic redundancy check (CRC) successively, and is modulated to in-phase component;
(3b) second user terminal (B) will assist the data channel coding method by appointment of first user terminal (A) transmission to encode again, and be modulated to quadrature component;
(3c) second user terminal (B) carries out sending to purpose terminal (D) after the power control to the in-phase component and the quadrature component of modulation;
(4) in the 3rd frame of cooperation transmission, first user terminal (A) sends local data, and assists second user terminal (B) to send data, and purpose terminal (D) and second user terminal (B) receive the data that first user terminal (A) sends simultaneously; Second user terminal (B) carries out channel decoding extract in-phase component from received signal after, and the data after the decoding are carried out verifying correctness:
Described first user terminal (A) sends local data, and assists second user terminal (B) to send data, carries out according to the following procedure:
(4a) first user terminal (A) successively through cyclic redundancy check (CRC) coding and chnnel coding, is modulated to in-phase component with local data;
(4b) first user terminal (A) will assist the data channel coding method by appointment of second user terminal (B) transmission to encode again, and be modulated to quadrature component;
After (4c) first user terminal (A) carries out power control to the in-phase component of modulation and quadrature component, send to purpose terminal (D);
(5) repeating step (3) is finished in the even frame k of cooperation transmission, local data that second user terminal (B) will send and the data of assisting first user terminal (A) to send, k 〉=4;
(6) repeating step (4) is finished the odd-numbered frame in cooperation transmission
In, local data that first user terminal (A) will send and the data of assisting second user terminal (B) to send,
〉=3;
(7) in the last frame of cooperation transmission, first user terminal (A) assists second user terminal (B) to send data, or second user terminal (B) assists first user terminal (A) to send data.
2. two users' collaboration communication method in the multi-user wireless network according to claim 1, wherein said chnnel coding adopts low-density checksum LDPC or convolution code or both cascade systems, and by these sign indicating numbers are punchinged, improves code efficiency.
3. two users' collaboration communication method in the multi-user wireless network according to claim 1, wherein step (2), step (3) and step (4) are described carries out verifying correctness to the data after the decoding, be to pass through CRC check, or the check matrix of chnnel coding self, or the cascade system of the check matrix of chnnel coding self and CRC check is carried out.
4. according to two users' collaboration communication method in claim 2 or the 3 described multi-user wireless networks, wherein said in-phase component and quadrature component being carried out power control, is by up channel and the mean value calculation in-phase component of terminal room channel and the power division ratio of quadrature component of purpose terminal (D) by first user terminal (A) and second user terminal (B); Send to first user terminal (A) and second user terminal (B) by the control channel feedback; First user terminal (A) and second user terminal (B) utilize the power division of feedback to send its in-phase component and quadrature component.
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| JP5079139B2 (en) * | 2009-04-28 | 2012-11-21 | 三菱電機株式会社 | Mobile communication system, base station and mobile terminal |
| CN101925185B (en) * | 2009-06-16 | 2014-03-12 | 华为技术有限公司 | Interference suppression method of relay cellular network, base station and network system |
| CN101800618B (en) * | 2009-09-24 | 2012-07-25 | 北京理工大学 | LDPC code constructing method based on coding cooperative communication |
| CN102857323A (en) * | 2012-09-17 | 2013-01-02 | 西安电子科技大学 | Amplification and transmission coordination based network coding method |
| CN102938686A (en) * | 2012-11-21 | 2013-02-20 | 西安电子科技大学 | Decode-and-forward cooperative communication method with high-order diversity |
| CN103945489A (en) * | 2014-04-30 | 2014-07-23 | 贵州大学 | Multi-relay cooperative self-adaptive relay selection and power distribution method |
| CN105634504A (en) * | 2014-11-07 | 2016-06-01 | 中兴通讯股份有限公司 | Data check method and device |
| CN104393965B (en) * | 2014-11-21 | 2017-11-21 | 西安电子科技大学 | User collaboration transmission method in multi-user wireless network |
| CN106160960B (en) * | 2015-04-15 | 2020-01-14 | 上海朗帛通信技术有限公司 | User equipment, base station and method for supporting multi-user superposition |
| CN108242983B (en) * | 2016-12-23 | 2020-11-24 | 中国电信股份有限公司 | Method and system for selecting auxiliary user terminal in carrier aggregation |
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