CN108599899A - A kind of cloud access row off the net is without speed rates mechanism - Google Patents
A kind of cloud access row off the net is without speed rates mechanism Download PDFInfo
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- CN108599899A CN108599899A CN201810439183.5A CN201810439183A CN108599899A CN 108599899 A CN108599899 A CN 108599899A CN 201810439183 A CN201810439183 A CN 201810439183A CN 108599899 A CN108599899 A CN 108599899A
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- remote radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
-
- 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
Abstract
The invention discloses a kind of cloud access rows off the net without speed rates mechanism, the system comprises user, Remote Radio Unit and baseband processing unit ponds, user is to being Radio Link between Remote Radio Unit node, and Remote Radio Unit node is to being high-speed link between baseband processing unit pond；In downlink system, the information that baseband processing unit pond is transmitted without rate coding passes the signal to corresponding Remote Radio Unit by precoding and quantization by the limited high-speed link of capacity；The quantized signal received broadcast is transferred to each user by each Remote Radio Unit, user according to the message of reception to by Remote Radio Unit node forward come information demapping, translate raw information finally by belief propagation algorithm.The present invention by cloud access net use can enhance transmission flexibility without speed rates mechanism, simultaneously because in the ponds BBU Combined Treatment information, system spectrum utilization rate can be improved.
Description
Technical field
The present invention relates to wireless communication technology fields more particularly to a kind of cloud access row off the net without speed rates mechanism.
Background technology
Currently, in social networks (Social Networks), Internet of Things (Internet of Things), car networking
Under the background that new business such as (Internet of Vehicles) rise, what next generation mobile communication network was faced will be sea
The number of users of amount and the volume of transmitted data of magnanimity.This just brings the promotion of wireless access network (RAN) capacity urgent
It is required that.
Cell density is promoted, it is one of the effective way for promoting network capacity to increase channeling.Cloud access net (C-RAN)
It is a kind of novel access planar network architecture, its main feature is that by the remote radio unit (RRU) (RRH) of each access node in network and base band
Reason unit (BBU) is completely separated, and by RRH closer to user, and each BBU is concentrated into the virtual ponds BBU backward, the ponds BBU and
RRH is connected by high-speed link.It has the advantage that in this way：The signal of all base stations is all uniformly carried out by the ponds BBU of rear end
Signal processing, this structure are natively conducive to the implementation of interference coordination, multipoint cooperative algorithm；Extended network only needs arrangement new
RRH and be laid with high-speed link, cost be less than set up with complete BBU base station.
In cloud access row off the net without in speed rates mechanism, message bit is encoded into the code word of endless, source by transmitting terminal
Source is constantly sent to receiving terminal, until the latter's correct decoding and feeding back ACK signal.No-rate codes have adaptivity,
Its rate adaptively changes with the variation of the channel undergone, and the adaptive characteristic of no-rate codes makes it possible to adaptation
Flexible transmission mechanism in cloud access net, while can make it still has when that can not obtain accurate channel state information to approach
The performance of channel capacity；No-rate codes do not need the feedback mechanism of hybrid automatic repeat-request (HARQ), can be effectively relieved
ACK the system loss brought of NACK signal feedback delay.The present invention provides a kind of cloud access row off the net without speed rates mechanism,
Transmission flexibility can be enhanced, simultaneously because in the ponds BBU Combined Treatment information, system spectrum utilization rate can be improved.
Invention content
For the above-mentioned problems in the prior art, the object of the present invention is to provide a kind of cloud access rows off the net without rate
Transmission mechanism.
A kind of cloud access row off the net is without speed rates mechanism, it is characterised in that system includes user, remote radio
Unit and baseband processing unit pond, to being Radio Link between Remote Radio Unit node, Remote Radio Unit node arrives user
It is high-speed link between baseband processing unit pond；In downlink system, letter that baseband processing unit pond is transmitted without rate coding
Breath, by precoding and quantization, corresponding Remote Radio Unit is passed the signal to by the limited high-speed link of capacity；It is each
The quantized signal received broadcast is transferred to each user by Remote Radio Unit, and user is according to the message of reception to by remote radio
The information demapping that cell node forwarding comes, raw information is translated finally by belief propagation algorithm.
A kind of cloud access row off the net is without speed rates mechanism, it is characterised in that is compiled without rate in baseband processing unit pond
The information that code is transmitted confirms that character completes the end of transmission until uplink feedback, and detailed process proceeds as follows：
2.1) no-rate codes by as Internal Code low-density checksum (LDPC) code and as the fountain codes (LT) of outer code
Code two parts composition；
2.2) the raw information s for encoding needs0,s1,……,skThe precoder for being sent into no-rate codes is encoded, root
Information b is generated according to low density parity check code code book1,b2,……,bn；
2.3) by the information b of generation1,b2,……,bnLT code coders are sent into, is distributed according to the number of degrees and chooses output node
The number of degrees continuously generate no-rate codes code word, coded identification c1,c2,……,cN；
2.4) to coded identification c1,c2,……,cNIt is modulated, i.e., reflects bit 0 and 1 respectively according to actual modulated mode
It penetrates to obtain modulation symbol x1,x2,……,xN；
2.5) channel state information of user (1) is arrived in multiple Remote Radio Unit (2) known to baseband processing unit pond (3)
In the case of, precoding, pre-coding matrix B=H are carried out to obtained modulation symbol using orthogonal Zero-forcing methodH(H·HH
)-1, wherein HHIt is matrix Hermitian transformation, then pre-coded symbols is put into normalization quantizer and are quantified, finally by capacity
Limited high-speed link sends quantized signal to corresponding Remote Radio Unit (2)；
2.6) Remote Radio Unit (2) node carries out de-quantization to the quantized signal received, and then broadcast is transferred to each
User (1)；
2.7) assume that the baseband signal gone out from Remote Radio Unit (2) node-node transmission passes through rayleigh fading channel, then
The signal y that user (1) k is receivedk=Hkx+zk, whereinIt is the base sent out from each Remote Radio Unit (2)
Band signal, channel matrixHk,iIt indicates from i-th of Remote Radio Unit (2) to user (1) k
Channel gain coefficient；
2.8) user is first soft demodulated received signal, then into row decoding.Specific decoding process is as follows：
2.8.1) demodulator output symbol log-likelihood ratio (LLR) is：Wherein y indicate from
The symbol that channel receives；
2.8.2) LT decoding iterations are handled, and it is 0 to enable the initial LLR of check-node m in the 0th wheel iterative decoding figure, variable node n
Initially LLR is：
L takes turns the LLR message transmitted when iteration：
Wherein Ψ (m) is to decode the check-node set that is connected with variable node n in figure, Ψ (n) be decode in figure with school
Test the connected variable node set of node m；
When p wheel iteration updates log-likelihood ratio informationMean value be more than that thresholding θ or p change equal to maximum
Enter the processing of LDPC decoding iterations as the known LLR of input node after generation number t；
The LLR message transmitted is when the l times iteration in the processing of LDPC decoding iterations：
2.8.3 posteriority likelihood ratio information) is adjudicatedIf L (si) then information bit is judged to ＞ 0
0, otherwise it is judged to 1；According to judgement output as a result, continuing iteration if decoding is incorrect, if decoding is correct or reaches greatest iteration
Number t terminates to decode；
2.9) after successfully decoded, user informs that the ponds BBU stop sending by uplink feedback ack signal.
By using above-mentioned technology, compared with prior art, beneficial effects of the present invention are as follows：
The present invention's is directed to C-RAN downlink multiuser scenes, the progress to no rate coding, precoding and quantization
Co-design, while proposing user terminal correspondingly decoding algorithm.Channel coding uses no-rate codes, no-rate codes to have adaptive
Property, i.e., no fixed transmission rate, rate adaptively changes with the variation of the channel undergone.The ponds BBU will be pre-
The signal of coding estimated, quantify after RRH is transmitted to by high-speed link, after RRH de-quantizations broadcast send each user to,
Each user restores the signal interpretation received the corresponding information of the ponds BBU transmission.
Description of the drawings
Fig. 1 is cloud access row off the net without speed rates schematic diagram of mechanism；
Fig. 2 is that cloud access row off the net compares figure without speed rates machine system throughput.
Specific implementation mode
Below in conjunction with Figure of description and embodiment, the invention will be further described, but protection scope of the present invention is simultaneously
It is not limited only to this：
Embodiment：With reference to figure one, cloud access of the invention row off the net is without speed rates mechanism, cloud access net downlink system
Including user, Remote Radio Unit (RRH) and the pond baseband processing unit (BBU), user to Remote Radio Unit (RRH) node it
Between be Radio Link, Remote Radio Unit (RRH) node to baseband processing unit is high-speed link between (ponds BBU), transmission
Mechanism concrete methods of realizing is as follows：
1.1) ponds BBU will be sent to the information of each user using no rate coding, and no-rate codes are by the LDPC of high code check
The LT codes of Internal Code and outer code part cascade composition, coding includes two steps, specially：
The first step, according to LDPC code, this encodes k raw information, and LDPC code generator matrix isWherein gk,iThe raw information of element in representing matrix G, input is S=[s0,
s1,……,sk], obtaining LDPC code symbol is：
Second step, to n LDPC symbols b1,b2,……,bnLT codings are carried out, output node is chosen according to number of degrees distribution
The number of degrees, the number of degrees be d output node it is equiprobable from symbol obtained above choose d code word obtain nothing as XOR operation
Rate code code word encodes the no-rate codes word c continually generated by two steps above1,c2,……,cN；
1.2) no-rate codes before precoding we be its carry out binary phase shift keying (BPSK) modulate, obtain by
The coding packet x of mappingk(s)；The sequence x sent by channelk={ xk(1),xk(2),,…,xk(j) ... } be endlessly,
Length is not fixed, xkEach length correspond to a corresponding code check.Then using orthogonal force zero to having obtained
Modulation symbol carry out precoding, pre-coding matrix B=HH(H·HH)-1, pre-coded symbols are then put into normalization quantizer
Quantify and corresponding RRH is sent to by high-speed link；
1.3) RRH node carries out de-quantization to the quantized signal received, and then broadcast is transferred to each user；
1.4) assume that the baseband signal transferred out from RRH node passes through rayleigh fading channel, then what user k was received
Signal yk=Hkx+zk, whereinIt is the baseband signal sent out from each RRH, channel matrixHk,iIndicate the channel gain coefficient from i-th of RRH to user k；
1.5) user is first soft demodulated received signal, then into row decoding.Specific decoding process is as follows：
1.5.1) demodulator output symbol log-likelihood ratio (LLR) is：Wherein y indicate from
The symbol that channel receives；；
1.5.2) LT decoding iterations are handled, and the initial LLR of check-node m are 0 in the 0th wheel iterative decoding figure, at the beginning of variable node n
Beginning, LLR was：
L takes turns the LLR message transmitted when iteration：
Wherein Ψ (m) is to decode the check-node set that is connected with variable node n in figure, Ψ (n) be decode in figure with school
Test the connected variable node set of node m；
When p wheel iteration updates log-likelihood ratio informationMean value be more than that thresholding θ or p change equal to maximum
Enter the processing of LDPC decoding iterations as the known LLR of input node after generation number t；
The LLR message transmitted is when the l times iteration in the processing of LDPC decoding iterations：
1.5.3 posteriority likelihood ratio information) is adjudicatedIf L (si) then information bit is judged to ＞ 0
0, otherwise it is judged to 1.According to judgement output as a result, continuing iteration if decoding is incorrect, if decoding is correct or reaches greatest iteration
Number t just terminates to decode；
1.5) after successfully decoded, user informs that the ponds BBU stop sending by one ack signal of uplink feedback.
Show from the computer artificial result of Fig. 2：Cloud access row off the net without speed rates can preferable effect, and with
The increase of the quantizer quantizing bit number in the ponds BBU, the throughput of system is obviously improved.
Claims (2)
1. a kind of cloud access row off the net is without speed rates mechanism, it is characterised in that system includes user (1), Remote Radio Unit
(2) and baseband processing unit pond (3), user (1) is to being Radio Link, remote radio list between Remote Radio Unit (2) node
First (2) node is to being high-speed link between baseband processing unit pond (3)；In systems, baseband processing unit pond (3) are compiled without rate
The information that code is transmitted passes the signal to corresponding radio frequency by precoding and quantization by the limited high-speed link of capacity
Extension unit (2)；The quantized signal received broadcast is transferred to each user (1) by each Remote Radio Unit (2), user according to
The message of reception to by Remote Radio Unit (2) node forward Lai information demapping, translated finally by belief propagation algorithm
Go out raw information.
2. a kind of cloud access row off the net according to claim 1 is without speed rates mechanism, it is characterised in that Base-Band Processing list
The information that first pond is transmitted without rate coding confirms that character completes the end of transmission until uplink feedback, detailed process according to as follows into
Row：
2.1) no-rate codes by as Internal Code low-density checksum (LDPC) code and as fountain codes (LT) code two of outer code
Part forms；
2.2) the raw information s for encoding needs0,s1,……,skThe precoder for being sent into no-rate codes is encoded, according to low
Density parity check code code book generates information b1,b2,……,bn；
2.3) by the information b of generation1,b2,……,bnLT code coders are sent into, the number of degrees for choosing output node are distributed according to the number of degrees
Continuously generate no-rate codes code word, coded identification c1,c2,……,cN；
2.4) to coded identification c1,c2,……,cNIt is modulated, i.e., maps bit 0 and 1 respectively according to actual modulated mode
To modulation symbol x1,x2,……,xN；
2.5) in the feelings of the channel state information of multiple Remote Radio Unit (2) known to baseband processing unit pond (3) to user (1)
Under condition, precoding, pre-coding matrix B=H are carried out to obtained modulation symbol using orthogonal Zero-forcing methodH(H·HH)-1,
Middle HHIt is matrix Hermitian transformation, then pre-coded symbols is put into normalization quantizer and are quantified, it is limited finally by capacity
High-speed link send quantized signal to corresponding Remote Radio Unit (2)；
2.6) Remote Radio Unit (2) node carries out de-quantization to the quantized signal received, and then broadcast is transferred to each user
(1)；
2.7) assume that the baseband signal gone out from Remote Radio Unit (2) node-node transmission passes through rayleigh fading channel, then user
(1) the signal y that k is receivedk=Hkx+zk, whereinIt is the base band letter sent out from each Remote Radio Unit (2)
Number, channel matrixHk,iIndicate the letter from i-th of Remote Radio Unit (2) to user (1) k
Road gain coefficient；
2.8) user is first soft demodulated received signal, then into row decoding.Specific decoding process is as follows：
2.8.1) demodulator output symbol log-likelihood ratio (LLR) is：Wherein y expressions connect from channel
The symbol of receipts；
2.8.2) LT decoding iterations are handled, and it is 0 to enable the initial LLR of check-node m in the 0th wheel iterative decoding figure, and variable node n is initial
LLR is：
L takes turns the LLR message transmitted when iteration：
Wherein Ψ (m) is to decode the check-node set being connected with variable node n in figure, and Ψ (n) is to be saved with verification in decoding figure
Variable node set connected point m；
When p wheel iteration updates log-likelihood ratio informationMean value be more than that thresholding θ or p are equal to greatest iteration time
Enter the processing of LDPC decoding iterations as the known LLR of input node after number t；
The LLR message transmitted is when the l times iteration in the processing of LDPC decoding iterations：
2.8.3 posteriority likelihood ratio information) is adjudicatedIf L (si) then information bit is judged to 0 to ＞ 0, it is no
Then it is judged to 1；According to judgement output as a result, continuing iteration if decoding is incorrect, if decoding is correct or reaches maximum iteration t
Terminate decoding；
2.9) after successfully decoded, user informs that the ponds BBU stop sending by uplink feedback ack signal.
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| CN109245800A (en) * | 2018-10-11 | 2019-01-18 | 浙江工业大学 | Cloud access row no-rate codes degree distribution off the net and precoding combined optimization method |
| CN111162876A (en) * | 2019-12-31 | 2020-05-15 | 三维通信股份有限公司 | Non-rate coding method and non-rate code decoding method for uplink transmission of two users |
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