CN109039976A - A kind of downlink multi-access cut-in method based on unique decodable code - Google Patents

A kind of downlink multi-access cut-in method based on unique decodable code Download PDF

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Publication number
CN109039976A
CN109039976A CN201811116246.XA CN201811116246A CN109039976A CN 109039976 A CN109039976 A CN 109039976A CN 201811116246 A CN201811116246 A CN 201811116246A CN 109039976 A CN109039976 A CN 109039976A
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user
decodable code
unique decodable
unique
information
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于启月
刘灏
李亚添
孟维晓
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A kind of downlink multi-access cut-in method based on unique decodable code, the present invention relates to the downlink multi-access cut-in methods based on unique decodable code.The purpose of the present invention is to solve the low problems of the reliability that existing multiple access method per unit band utilization rate is low and communicates.One, for downlink, transmitting terminal is base station, and receiving end is user, it is assumed that has M user terminal, for m-th of user, 1≤m≤M；M-th of user is encoded by unique decodable code encoder, obtains unique decodable code codeword set, the information sequence after coding is vm, two, by vmBPSK modulation mapping is carried out, the symbolic vector after mapping is xm；It three, is y for the signal that m-th of user receivesm；Four, user decodes the signal received, obtains the information of base station transmission.The present invention is used for multiple access technique field.

Description

A kind of downlink multi-access cut-in method based on unique decodable code
Technical field
The present invention relates to downlink multi-access cut-in methods.
Background technique
With flourishing for the communication technology, wireless mobile communications become important composition indispensable in daily life Part.And multiple access technique is always the core technology of mobile radio system.
(Frequency Division Multiple is accessed from the frequency division multiple access of the first Generation Mobile Communication System (1G) Access, FDMA), the time division multiple acess of second generation mobile communication system (2G) access (Time Division Multiple Access, TDMA), the CDMA of 3-G (Generation Three mobile communication system) (3G) access (Code Division Multiple Access, CDMA), arrive the orthogonal frequency division multiple access (Orthogonal of forth generation mobile communication system (4G) Frequency division multiple access, OFDMA), the evolution of multiple access technology has greatly pushed wireless mobile The update process of communication.
Now with the development of Internet of Things, in addition to traditional mobile phone terminal, more and more machines are also added to mobile logical In communication network.Existing multiple access method per unit band utilization rate it is low and communication reliability it is low.As these are large-scale User's access, how in limited band resource and time resource environment, while servicing more users, improves per unit band Spectrum utilization efficiency, take into account the service quality of each user at the same time, it is huge to be that next-generation wireless mobile communications face Problem.
Summary of the invention
The purpose of the present invention is to solve existing multiple access method per unit band utilization rate it is low and communication it is reliable The low problem of property, and propose a kind of downlink multi-access cut-in method based on unique decodable code.
A kind of downlink multi-access cut-in method detailed process based on unique decodable code are as follows:
Step 1:
For downlink system, transmitting terminal is base station, and receiving end is user, it is assumed that has M user terminal, for m A user, 1≤m≤M；If m-th of user information vector is bm, bmIn each symbol belong to galois field GF (2), i.e. bmIt takes Value 0 or 1；
M-th of user is passed through into unique decodable code encoder CmIt is encoded, obtains unique decodable code codeword set Am, compile Information sequence after code is vm=(vm,1,vm,2,...,vm,n,...,vm,N),
Wherein, vmFor unique decodable code codeword set AmIn an element, be a N-dimensional vector；N is each user Code word size；vm,nFor n-th of information bit in the information sequence after coding；
Step 2: by vmCarry out BPSK (binary phase shift keying) modulation mapping, the symbol arrow after mapping Amount is xm=(xm,1,xm,1,...,xm,n,...,xm,N),
Work as vm,nWhen=1, xm,n=1；Work as vm,nWhen=0, xm,n=-1；
Wherein 1≤n≤N, xm,nFor nth symbol position；
Step 3: send signal be actually M subscriber signal with so the signal received for m-th of user is ym=(ym,1,ym,2,...,ym,n,...,ym,N)；
Wherein
In formula, znFor additive white Gaussian noise (additive white Gaussian noise, AWGN)；hmFor from base station To the flat fading channel shock response of m-th of user；
Step 4: user decodes the signal received, the information of base station transmission is obtained.
The invention has the benefit that
Downlink multi-access cut-in method based on unique decodable code can allow multiple users simultaneously with channel is accessed frequently, together When allow downlink system and rate be greater than 1, such as the two users obtained based on (7,4) Hamming code unique decodable code and rate It can achieve Rsum=1.1295, to improve the availability of frequency spectrum of per unit band.Rationally designing simultaneously to code word can be with Allow entire downlink system that there is error correcting capability, so that the reliability and validity of system are significantly improved, under this is current The unexistent feature of row access system.
As shown in Fig. 2, unique decodable code downlink multi-access access system two users' feelings that this Experimental comparison code length is 2,4,7 The performance curve of condition, user 1 have used linear block codes, and user 2 is then the unique decodable code code word set obtained based on user 1 It closes, two respective codeword sets of user together constitute unique decodable code pattern set Ψ, it can be seen that have and rate Under advantage greater than 1, unique decodable code downlink multi-access access system has only paid the cost of less performance loss.
Detailed description of the invention
Fig. 1 is the downlink transmission method flow diagram based on unique decodable code；
Fig. 2 is the unique decodable code downlink multi-access access system Performance Simulation Results figure of two users, and BER is bit error rate, SNR is signal power to noise power ratio, C1For the code word of user 1, UE1 is user 1, RsumFor and rate, BPSK be binary phase-shift key Control system.
Specific embodiment
Specific embodiment 1: a kind of specific mistake of downlink multi-access cut-in method based on unique decodable code of present embodiment Journey are as follows:
Step 1:
For downlink system, transmitting terminal is base station, and receiving end is user, it is assumed that has M user terminal, for m A user, 1≤m≤M；If m-th of user information vector is bm, bmIn each symbol belong to galois field GF (2), i.e. bmOnly It can value 0 or 1；
M-th of user is passed through into unique decodable code encoder CmIt is encoded, obtains unique decodable code codeword set Am, compile Information sequence after code is vm=(vm,1,vm,2,...,vm,n,...,vm,N),
Wherein, vmFor unique decodable code codeword set AmIn an element, be a N-dimensional vector；N is each user Code word size；vm,nFor n-th of information bit in the information sequence after coding；
Step 2: by vmCarry out BPSK (binary phase shift keying) modulation mapping, the symbol arrow after mapping Amount is xm=(xm,1,xm,1,...,xm,n,...,xm,N),
Work as vm,nWhen=1, xm,n=1；Work as vm,nWhen=0, xm,n=-1；
Wherein 1≤n≤N, xm,nFor nth symbol position；
Step 3: send signal be actually M subscriber signal with so the signal received for m-th of user is ym=(ym,1,ym,2,...,ym,n,...,ym,N)；
Wherein
In formula, znFor additive white Gaussian noise (additive white Gaussian noise, AWGN)；hmFor from base station To the flat fading channel shock response of m-th of user；
Step 4: user decodes the signal received, the information of base station transmission is obtained.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: by m-th in the step 1 User passes through unique decodable code encoder CmIt is encoded, detailed process are as follows:
Assuming that user terminal number is M, the code word size of each user is N；And enable VNIt indicates on galois field GF (2) All N-dimensional vectors；Define AmPass through unique decodable code encoder C for m-th of usermCodeword set after being encoded, AmFor VNSubset；
For M all users, in corresponding codeword set AmInterior arbitrary two different code word um,vmMeet
Meet the set { A of the codeword set of above-mentioned conditionmBe unique decodable code code word set, each codeword set AmReferred to as unique decodable code.
Other steps and parameter are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: it is used in the step 4 Family decodes the signal received, obtains the information of base station transmission；Detailed process are as follows:
Receiver detection algorithm includes two steps: first, mutually distinguishing and detected multi-user information, needing exist for using The interpretation method of unique decodable code；Second, each user information is decoded, obtained according to the coding mode of unique decodable code Obtain the transmission information of each user.
Step 4 one, each user are to the signal y receivedmIt carries out BPSK (binary phase shift keying) Demodulation, the signal r after being demodulated；
Step 4 two distinguishes the signal r after demodulation, obtains the information of base station transmission.
Other steps and parameter are the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: the step 4 The signal r after demodulation is distinguished in two, obtains the information of base station transmission；Detailed process are as follows:
Define unique decodable code pattern set Ψ are as follows:
For the codeword set A of m-th of usermHave | Am| a code word, then unique decodable code pattern set Ψ hasA element；
Enable | Ψ | indicate the element number of unique decodable code pattern set Ψ, will | Ψ | a element numerals are ψ1,ψ2, ψ3,...,ψi,...,ψ|ψ|；
For example, if C1={ 00,11 }, C2={ 00,01,10 }, (0, which is mapped as -1,1, is mapped as after progress BPSK is modulated 1) the unique decodable code pattern set Ψ that obtains is
Ψ={ ψ1=-2-2, ψ2=00, ψ3=-20, ψ4=02, ψ5=0-2, ψ6=20 }
According toSignal r after demodulation is distinguished, the reception information of each user, i.e. base are obtained Stand send information；
Wherein,For the decoding pattern obtained after differentiation；ψiFor | Ψ | in i-th of element.
Other steps and parameter are identical as one of specific embodiment one to three.
Beneficial effects of the present invention are verified using following embodiment:
Embodiment one:
A kind of multiple access method based on unique decodable code of the present embodiment is specifically to be prepared according to the following steps:
Unique decodable code
The unique decodable code that the present invention uses is used to distinguish user.The definition for the unique decodable code introduced herein, it is all The set for meeting unique decoding definition is all unique decodable code set.
The definition of unique decodable code
For two users' situation, if vNIndicate all N-dimensional vectors in (2) galois field GF.For vNInterior appoints Anticipate two user vector u1=(u1,1,u1,2,...,u1,N) and u2=(u2,1,u2,2,...,u2,N), define E (u1,u2) indicate N-dimensional Vector
E(u1,u2)=(E (u1,1,u2,1),E(u1,2,u2,2),...,E(u1,n,u2,n),...,E(u1,N,u2,N))
Wherein for nth elements, E (u1,n,u2,n)=u1,n+u2,n。
So E (u1,u2) it is the N-dimensional vector that each element belongs to { 0,1,2 }.Assuming that C1And C2It is VNTwo subsets, Middle u1∈C1, u2∈C2.Define C1×C2It is code word to the set (u of composition1,u2), and if only if for any two pairs in C1×C2 Different code words to (u1,u2) and (u1',u2') meet E (u1,u2)≠E(u1',u2') it is considered that (C1,C2) it is that can uniquely translate Code.For convenience's sake, define | Cm| it is set CmThe number of middle element.
The example of a classical unique decodable code is given below: considering two users' unique decodable code, it is assumed that the code of user 1 Word set C1={ 00,11 }, the codeword set C of user 22={ 00,10,01 }.
1 unique decodable code example of table
With this condition, | C1|=2, | C2|=3.
After using BPSK modulation, which becomes:
Table 2 modulates later unique decodable code using BPSK
It can be seen that modulating later signal is still that can uniquely translate.
The case where definition of two users' unique decodable code of appeal is generalized to multi-user, it is assumed that number of users M, code word are long Degree is N.And enable VNIndicate all N-dimensional vectors on galois field GF (2).Define CmOnly for m (1≤m≤M) a user One decodable code codeword set, it is clear that CmFor VNSubset.For M all users, in corresponding codeword set CmIt is interior arbitrary Two different code word um,vmIf be all satisfied
So set { C of codeword setmBe unique decodable code code word set, each codeword set CmIt is referred to as unique Decodable code.
Embodiment two:
The performance for unique decodable code downlink multi-access access system two users' situation that this Experimental comparison code length is 2,4,7 is bent Line, user 1 have used linear block codes, and user 2 is then the unique decodable code codeword set obtained based on user 1, two users Respective codeword set together constitutes unique decodable code pattern set Ψ, it can be seen that has the advantage for being greater than 1 with rate Under, unique decodable code downlink multi-access access system has only paid the cost of less performance loss；Such as Fig. 2.
The present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, this field Technical staff makes various corresponding changes and modifications in accordance with the present invention, but these corresponding changes and modifications all should belong to The protection scope of the appended claims of the present invention.

Claims (4)

1. a kind of downlink multi-access cut-in method based on unique decodable code, it is characterised in that: the method detailed process are as follows:
Step 1:
For downlink, transmitting terminal is base station, and receiving end is user, it is assumed that there is M user terminal, for m-th of user, and 1 ≤m≤M；If m-th of user information vector is bm, bmIn each symbol belong to galois field GF (2), i.e. bmValue 0 or 1；
M-th of user is passed through into unique decodable code encoder CmIt is encoded, obtains unique decodable code codeword set Am, after coding Information sequence be vm=(vm,1,vm,2,...,vm,n,...,vm,N),
Wherein, vmFor unique decodable code codeword set AmIn an element, be a N-dimensional vector；N is the code of each user Word length；vm,nFor n-th of information bit in the information sequence after coding；
Step 2: by vmBPSK modulation mapping is carried out, the symbolic vector after mapping is xm=(xm,1,xm,1,...,xm,n,..., xm,N),
Work as vm,nWhen=1, xm,n=1；Work as vm,nWhen=0, xm,n=-1；
Wherein 1≤n≤N, xm,nFor nth symbol position；
Step 3: being y for the signal that m-th of user receivesm=(ym,1,ym,2,...,ym,n,...,ym,N)；
Wherein
In formula, znFor additive white Gaussian noise；hmFor from base station to the flat fading channel shock response of m-th of user；
Step 4: user decodes the signal received, the information of base station transmission is obtained.
2. a kind of downlink multi-access cut-in method based on unique decodable code according to claim 1, it is characterised in that: the step M-th of user is passed through into unique decodable code encoder C in rapid onemIt is encoded, detailed process are as follows:
Assuming that user terminal number is M, the code word size of each user is N；And enable VNIndicate the institute on galois field GF (2) There is N-dimensional vector；Define AmPass through unique decodable code encoder C for m-th of usermCodeword set after being encoded, AmFor VN's Subset；
For M all users, in corresponding codeword set AmInterior arbitrary two different code word um,vmMeet
Meet the set { A of the codeword set of above-mentioned conditionmBe unique decodable code code word set, each codeword set AmClaim For unique decodable code.
3. a kind of downlink multi-access cut-in method based on unique decodable code according to claim 2, it is characterised in that: the step User decodes the signal received in rapid four, obtains the information of base station transmission；Detailed process are as follows:
Step 4 one, each user are to the signal y receivedmCarry out BPSK demodulation, the signal r after being demodulated；
Step 4 two distinguishes the signal r after demodulation, obtains the information of base station transmission.
4. a kind of downlink multi-access cut-in method based on unique decodable code according to claim 3, it is characterised in that: the step The signal r after demodulation is distinguished in rapid 42, obtains the information of base station transmission；Detailed process are as follows:
Define unique decodable code pattern set Ψ are as follows:
For the codeword set A of m-th of usermHave | Am| a code word, then unique decodable code pattern set Ψ hasA member Element；
Enable | Ψ | indicate the element number of unique decodable code pattern set Ψ, will | Ψ | a element numerals are ψ1,ψ2,ψ3,..., ψi,...,ψ|ψ|；
According toSignal r after demodulation is distinguished, the reception information of each user is obtained, is i.e. base station is sent Information；
Wherein,For the decoding pattern obtained after differentiation；ψiFor | Ψ | in i-th of element.
CN201811116246.XA 2018-09-25 2018-09-25 A kind of downlink multi-access cut-in method based on unique decodable code Pending CN109039976A (en)

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CN112073154A (en) * 2020-09-17 2020-12-11 哈尔滨工业大学 Method for obtaining unique translatable mapping codebook in downlink multiple access system
CN114337901A (en) * 2021-12-28 2022-04-12 哈尔滨工业大学 Method for constructing multiple-value sequence set suitable for multiple-address access system
CN116938336A (en) * 2023-09-18 2023-10-24 中国科学院长春光学精密机械与物理研究所 Signal combining method for multi-antenna laser communication system

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Publication number Priority date Publication date Assignee Title
CN112073154A (en) * 2020-09-17 2020-12-11 哈尔滨工业大学 Method for obtaining unique translatable mapping codebook in downlink multiple access system
CN114337901A (en) * 2021-12-28 2022-04-12 哈尔滨工业大学 Method for constructing multiple-value sequence set suitable for multiple-address access system
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CN116938336B (en) * 2023-09-18 2023-12-19 中国科学院长春光学精密机械与物理研究所 Signal combining method for multi-antenna laser communication system

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Application publication date: 20181218