CN102075288B - Network-code-based free-space optical cooperative relay communication method - Google Patents
Network-code-based free-space optical cooperative relay communication method Download PDFInfo
- Publication number
- CN102075288B CN102075288B CN201010595774.5A CN201010595774A CN102075288B CN 102075288 B CN102075288 B CN 102075288B CN 201010595774 A CN201010595774 A CN 201010595774A CN 102075288 B CN102075288 B CN 102075288B
- Authority
- CN
- China
- Prior art keywords
- node
- source
- log
- signal
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Radio Transmission System (AREA)
Abstract
The invention belongs to the technical field of wireless communication, and particularly relates to a network-code-based free-space optical cooperative relay communication method. In the invention, a relay node of the system is provided with a baseband signal processing module which can perform the network coding for relay data; in addition, a destination node utilizes a double iterative receiver structure and a network-code-based iterative detection algorithm to detect the information of a multi-source node. The method can provide a space diversity gain to a destination node receiver. The transmission reliability which is higher than that of the traditional multi-source system can be realized; and at the same time, the expenditure of relay equipment can be reduced, and the system capacity can be improved.
Description
Technical field
The invention belongs to wireless communication technology field, be specifically related to a kind of free space radio light cooperating relay communication means of coding Network Based.
Background technology
Free space optical communication technology (FSO, Free-Space Optics), claims again wireless light communication, and it is take atmosphere as transmission medium, take laser as carrier, in order to the wireless communication technology of transmitting high speed information.It is the combination of optical communication and radio communication, has many advantages, for example high data rate, do not take licensed band and low equipment cost.As a kind of promising solution of " last mile " problem, free space optical communication technology has obtained extensive concern.But concerning free-space optical communication system, atmospheric attenuation and atmospheric turbulance can seriously reduce transmission reliability and throughput of system.
Cooperating relay transmission technology is made up of sending node, via node and receiving node conventionally.Decoding forwards (DF, Decode-and-Forward) light cooperating relay transmission technology is exactly to carry out decoding at the signal of via node spontaneous emission in the future node, and then forward the signal of recompile to next receiving node with certain luminous power, claim again reproduced light relaying.Decoding forward relay mode can be eliminated the noise accumulation in transmitting procedure, can realize remote, large capacity, high-quality digital communication; Meanwhile, can be combined the space diversity effect that provides good by treatment technology in the time of sky.
The decoding of coding Network Based forwards light cooperating relay and has attracted great attentiveness as a kind of novel cooperation transmission method.It can significantly improve throughput and the reliability of system, and can resist link failure.The relay transmission technology of current free space optical communication also lacks application in the scene of multiple source nodes.Especially in free space optical communication network, the research of the nonopiate multi-source cooperation of coding Network Based (MSC, Multi-source Cooperation) trunking plan is just at the early-stage.This patent, for the MSC relay communications system of free space optical communication, proposes the non-orthogonal multi-source wireless optical transmission of the interleaving iterative method of a kind of coding cooperative Network Based (NetCC, Network Coding Cooperation).The method can make single relay node services in multiple source nodes, and can obtain significant collaboration diversity gain, can reduce error rate of system performance, reduces equipment cost, reduce the cooperation transmission time etc.
Summary of the invention
The object of the invention is to propose a kind of free space optical cooperating relay communication means of multi-source node, to reduce error rate of system performance, reduce equipment cost, to reduce the cooperation transmission time.
The present invention has proposed the nonopiate multi-source free space optical communication method of coding cooperative relaying Network Based first, and it can complete the transmission of multi-source node cooperation decoding forward relay in two time slots.This trunking method can obtain significant diversity gain, makes a light via node can serve multiple source nodes simultaneously.Compared with conventional orthogonal light relay transmission, the nonopiate smooth relay transmission of the multi-source of two time slots can significantly reduce time overhead, can improve the throughput of system.
Free space multi-source cooperating relay optical transmission system of the present invention as shown in Figure 1, its by
individual source node (source user, number is unrestricted), via node and destination node composition.Here,
represent source node,
;
represent via node.Trunking method comprises two transmit stages: the first stage, i.e. directly transmission, as shown in Fig. 1 (a).Second stage, i.e. cooperating relay transmission, as shown in Fig. 1 (b).
The whole trunking traffic flow process of the present invention's design will divide two stages to complete in two time slots.
(1) first stage, directly transmission.
As shown in Fig. 1 (a) and Fig. 2: first, information bit sequence
,
, by forward error correction coding, produce chnnel coding sequence
.Here,
for information bit frame length,
for the frame length after coding.Then, coded sequence input interleaver
interweave, produce constellation modulation symbol sequence
,
.Sequence symbolization modulator approach after interweaving, then drive optical modulator, and launch.
The light signal of launching will be subject to atmospheric turbulance influence of fading.At destination node, adopt Photoelectric Detection.The output electrical signals of photoelectric detector
be superimposed with white Gaussian noise again and disturb, the signal of telecommunication receiving is:
Wherein,
for photoelectric conversion efficiency,
light Turbulence Channels pad value between road information source node and destination node,
n[
l] be white Gaussian noise sampled point.
In free-space optical communication system model, channel can be assumed that piece decline (Block Fading) channel,
in continuous multiple mark spaces, remain unchanged.
As shown in Figure 3, receiver detects (MSD, Multi-source Detection) module, soft network decoding module and K Probability Decoding device (DEC, Decoder) composition by multi-source to the iterative receiver structure that the present invention proposes.Wherein multi-source detection module is used to process impact and the multiple source interference of Turbulence Channels.
Signal after the opto-electronic conversion receiving is provided by formula (1).At receiving terminal, to each source node, formula (1) can be rewritten as:
Wherein:
.Disturb in order to eliminate multi-source light signal, the present invention proposes a kind of soft multi-source light detection method based on OOK modulation, as the formula (3).With this, can obtain log-likelihood ratio (LLR, the Log-likelihood Ratio) information of source node
(asking for an interview appendix 1 derives):
Wherein,
And,
with
represent respectively variance and the average of stochastic variable x.
be about
priori likelihood ratio information, it is set as 0 in the time of iteration for the first time.Subsequently, by outside likelihood ratio information
in each iteration, upgrade.As shown in Figure 3,
be input to deinterleaver.In order to realize collaboration diversity gain, deinterleaving
with network code decoder
log-likelihood ratio by merged summation.Subsequently, obtain
as the prior information of decoder (DEC), its can calculate about
posteriority log-likelihood value
.After this, in order to obtain outside log-likelihood value LLR
, will carry out subtraction
.Then, outside log-likelihood value LLR is by the prior information as next iteration in multi-source detection module.So iterative processing, after iteration, can obtain the information bit detecting the last time by hard decision
.
(2) second stage, i.e. relay transmission.This stage takies a time slot.Workflow is: source node transmits same data sequence again to via node, and then is forwarded to destination node.First, via node uses the soft multi-source detection method based on OOK in appendix 1, recovers the information bit sequence of institute's active node
,
.Thereafter the information data sequence of recovery,
by recompile, produce stream of chips
.Via node Adoption Network coding (Network Coding) is to the stream of chips of source node encode (as: linear network encoding).Can produce the stream of chips after coded combination
(as:
,
represent by element xor operation).After this interweave and symbol-modulated, in via node
sequence drives optical modulator, launches to destination node.
Like this, at the second time slot, the stream of chips that destination node receives can be expressed as
, wherein
it is the transmit chip of via node.
it is the fading channel that via node causes to atmospheric turbulance between destination node.
be that average is 0, variance is
additive white Gaussian noise.
Destination node uses Maximum Likelihood Detection, can be about
log-likelihood information LLR:
Then have,
（5）
Wherein:
,
.And,
, wherein
,
,
.Derive by obtaining in appendix 2 specifically.
In sum, the inventive method is summarized as follows:
Adoption Network coding cooperative relay system model.Wherein, communication node is divided into source node, via node and target receiving node.Different source nodes and via node have different pseudo random interleavers, and its interlacing pattern can adopt that diagonal angle interweaves, block interleaving or the inner interleaving design method of Turbo code; Produce different interlacing patterns by pseudo random interleaver, distribute to source node, via node; Destination node utilizes the interleaving iterative interference elimination method of two time slot codings Network Based to eliminate the mutual interference between source signal, detects and obtains source node data.Whole trunking traffic flow process is divided into two time slot stages, is specially:
(1) first time slot transmitting is processed
In the first time slot, the media Access Layer of each source node is set certain utilizing emitted light power to the data that will transmit, and data are delivered to physical layer transmitter module; In physical layer transmitter module, first data will carry out chnnel coding (as: duplication code coding); Interweave according to interlacing pattern again, then carry out symbol-modulated; Then according to corresponding luminous power Emission Factor, by driving laser modulator, data transmission is gone out.
(2) first time slot reception & disposals
In the first working time slot, destination node adopts Direct Inspection Technology.The output signal of photodiode
can utilize the Iterative detection algorithm of appendix 1 to process.Meanwhile, wait for the network code repeating signal that via node transmits.
(3) second time slot transmittings are processed
In the second working time slot, via node receives laser signal, and carries out Photoelectric Detection.Receiver module, according to distributed interlacing pattern, utilizes the Iterative detection algorithm of appendix 1, carries out the iterative interference cancellation processing of data.Then, symbolic solution interweaves, channel decoding, obtains the soft information of log-likelihood ratio of signal.And, decoding the data obtained is input to media Access Layer, carry out verification and data storage; Then the information of, utilizing network code to carry out between multi-source node merges; Then, duplication code coding, symbol constellation modulation; According to repeat transmitted luminous power, driving laser modulator, goes out data transmission again;
(4) second time slot reception & disposals
In the second time slot destination node receiving course, receiver module part adopts Direct Inspection Technology, first carries out opto-electronic conversion, obtains receiving the signal of telecommunication; Also carry out to received signal the calculating of log-likelihood value according to maximum likelihood algorithm formula (4) again; Then, utilize accompanying drawing 2 to carry out network decoding, and by gained likelihood value
log-likelihood ratio with the first time slot deinterleaving
merge summation, to realize collaboration diversity gain.Subsequently, the merging log-likelihood ratio information obtaining
as the prior information of decoder, carry out decoding.After this, will carry out subtraction
to obtain outside log-likelihood value
.Then, outside log-likelihood value is by the prior information as next iteration in multi-source detection module.So iterative processing, after iteration, can obtain the multi-source information bit detecting the last time by hard decision.
In the present invention, via node adopts full duplex laser transmitting-receiving processing module, and it is made up of reception & disposal unit and transmitting processing unit.The photoelectric detector of reception & disposal unit receives laser signal, and the row iteration of going forward side by side is disturbed and eliminated, symbolic solution interweaves, channel decoding is adjudicated, and is sent to media Access Layer and stores; Via node transmitting processing unit will carry out chnnel coding, network code and sign map, finally by be emitted to receiving target node by laser modulator.
In the present invention, receiving node adopts the information detector of double iterative structure.
In the present invention, the interleaving iterative interference cancellation algorithm of the described network code relaying based on OOK modulation is as follows, and concrete steps are:
(1) computing network coding relay transmission is to the signal log-likelihood value of destination node:
(2) calculate the signal log-likelihood value that destination node obtains:
(3) iteration initialization
If
(C-3)
(4) iterative process
Wherein
（C-6）
symbol description:
invention advantage:
1, the nonopiate free space optical cooperating relay communication means of coding Network Based can complete the relay transmission of multiple source nodes in two time slots, and it can reduce transmission time expense, contributes to improve throughput of system.
2, a via node can be just multiple source node services, can reduce thus trunking expense, simplified network design.Meanwhile, via node utilizes the signal of network code relay forwarding, can provide space diversity gain for receiving node, will significantly improve the transmission accuracy of system.
3, the interleaving iterative multi-source detection algorithm based on OOK modulation is effectively processed impact and the interference of multi-source node optical signal of Turbulence Channels.
4, the network code soft decoding algorithm detecting based on light can provide relaying soft value for each source node.Meanwhile, double iterative receiver structure can effectively merge to soft network decoding value in source node likelihood information, obtains thus space diversity gain.
Accompanying drawing explanation
Fig. 1 is the free-space optical transmission method diagram based on coding cooperative relaying Network Based.
Fig. 2 is the free-space optical transmission link that multi-source disturbs.
Fig. 3 is the structure of coding cooperative transmission iterative detection receiver Network Based.
Fig. 4 is that conclusion one (Performance Ratio of the light trunking plan of coding Network Based and tradition nothing cooperation scheme) is analyzed in system emulation of the present invention.(this scene has 4 source nodes and a via node, Gamma-Gamma decay
with
).
Fig. 5 is that conclusion two (impact of the light relay system bit error rate performance of source node number on coding Network Based) is analyzed in system emulation of the present invention.(this scene has respectively
individual source node, Gamma-Gamma decay
with
)
Embodiment
The free-space optical transmission method of the coding cooperative relaying Network Based that the present invention is proposed, its concrete implementation step is as follows:
1, produce the information bit data of random distribution;
2, produce one group of pseudo random interleaving pattern, and be assigned in each transmitting node interleaver.Meanwhile, via node and target receiving node are also stored this group interlacing pattern;
3, this free-space optical communication system divides two time slots to carry out work:
(1) first time slot transmitting is processed
In the first time slot, the media Access Layer of each source node is set certain utilizing emitted light power to the information bit data that will transmit, and data are delivered to physical layer transmitter module; In physical layer transmitter module, first data carry out chnnel coding (as: duplication code coding), interweave according to interlacing pattern again, then carry out OOK modulation, then according to corresponding luminous power Emission Factor, by driving laser modulator (as: Mach-Zehnder modulator), data transmission is gone out.
(2) first time slot reception & disposals
In the first working time slot, destination node adopts Direct Inspection Technology.The output signal of photodiode
utilize the Iterative detection algorithm of appendix 1 to process.Meanwhile, wait for the network code repeating signal that via node transmits.
(3) second time slot transmittings are processed
In the second working time slot, the laser signal of via node reception sources node, and carry out Photoelectric Detection.Receiver module, according to distributed interlacing pattern, utilizes the Iterative detection algorithm of appendix 1, carries out the iterative interference cancellation processing of data.Then, symbol de-maps, channel decoding, obtain the soft information of log-likelihood ratio of signal.And, decoding the data obtained is input to media Access Layer, carry out verification and data storage; Thereafter the information of utilizing network code to carry out multi-source node, merges; Then, chnnel coding, interweave, symbol constellation modulation; According to repeat transmitted luminous power, driving laser modulator, goes out data transmission again.
(4) second time slot reception & disposals
In the second time slot destination node receiving course, receiver module part is utilized Direct Inspection Technology.First carry out opto-electronic conversion, obtain receiving the signal of telecommunication; According to maximum likelihood algorithm formula (4), carry out to received signal the calculating of log-likelihood value again; Then, utilize accompanying drawing 2 to carry out network decoding, and by gained likelihood value
log-likelihood value with the first time slot deinterleaving
summation, to realize collaboration diversity gain.Subsequently, the merging log-likelihood ratio obtaining
as the prior information of channel decoder, carry out decoding.Then, will carry out subtraction
to obtain outside log-likelihood value
.Outside log-likelihood value is again by the prior information as next iteration in multi-source detection module.So iterative processing, after iteration, can obtain the multi-source information bit detecting the last time by hard decision.
Fig. 4, Fig. 5 are last simulation analysis result, wherein:
Fig. 4 shows, the inventive method is with compared with cooperating relay scheme, and the inventive method is at high E
b/ N
0good quality channel performance more superior.For example, if BER be
, the present invention is than the gain that has 8.5dB without cooperating relay scheme.This is that the log-likelihood ratio LLR information reliability of network decoding gained is high because in good channel, can realize collaboration diversity gain.
Fig. 5 shows, along with reducing of source node number, can obtain the lower error rate.Reason is as follows, and network code trunking plan is
, all source node data are merged, and then relay transmission arrives destination node forward.For each source node, only some trunk information can provide collaboration space diversity.Signal merges more, and diversity gain is just fewer, and BER is just higher.
Based on the derivation of OOK interleaving iterative multiple source detection algorithm formula (3).First,
Wherein,
(A-2)
Then,
Wherein,
be from
the outside likelihood information of channel decoder.
（A-7）。
appendix 2the derivation of multi-source meshed network decoding algorithm formula (5)
First,
And,
Wherein,
,
,
。
Claims (1)
1. an interleaving iterative multi-source cooperating relay free space optical communication method for coding Network Based, is characterized in that Adoption Network coding cooperative relay system model, and wherein, communication node is divided into source node, via node and target receiving node; Different source nodes and via node have different pseudo random interleavers, and its interlacing pattern adopts that diagonal angle interweaves, block interleaving or the inner interleaving design method of Turbo code; Produce different interlacing patterns by pseudo random interleaver, distribute to source node, via node; Via node adopts full duplex laser transmitting-receiving processing module, and it is made up of reception & disposal unit and transmitting processing unit; Target receiving node utilizes two time slots, adopts the interleaving iterative interference cancellation algorithm of the network code relaying based on OOK modulation, eliminates the mutual interference between source signal, detects and obtains source node data; Whole trunking traffic flow process is divided into two time slot stages, specific as follows:
(1) first time slot transmitting is processed
In the first time slot, the media Access Layer of each source node is set certain utilizing emitted light power to the data that will transmit, and data are delivered to physical layer transmitter module; In physical layer transmitter module, first data carry out chnnel coding; Interweave according to interlacing pattern again, then carry out symbol-modulated; Then according to corresponding luminous power Emission Factor, by driving laser modulator, data transmission is gone out;
(2) first time slot reception & disposals
In the first time slot, target receiving node adopts Direct Inspection Technology; The output signal of photodiode
utilize Iterative detection algorithm to process, obtain log-likelihood ratio (LLR) information of source node
:
Wherein,
（3-d）
Wherein,
with
represent respectively variance and the average of stochastic variable x,
be about
priori likelihood ratio information, it is set as 0 in the time of iteration for the first time; Subsequently, by outside likelihood ratio information
in each iteration, upgrade; Will
be input to deinterleaver, obtain
; Deinterleaving
with network code decoder
log-likelihood ratio merge summation; Subsequently, obtain
as the prior information of decoder (DEC), calculate about
posteriority log-likelihood value
; Afterwards, carry out subtraction
obtain outside log-likelihood value LLR
; Then, outside log-likelihood value LLR is taken as the prior information of next iteration in multi-source detection module;
Meanwhile, wait for the network code repeating signal that via node transmits;
(3) second time slot transmittings are processed
In the second time slot, via node receives laser signal, and carries out Photoelectric Detection; Wherein, via node adopts full duplex laser transmitting-receiving processing module, it is made up of reception & disposal unit and transmitting processing unit, and the photoelectric detector of reception & disposal unit receives laser signal, according to distributed interlacing pattern, utilize Iterative detection algorithm, carry out the iterative interference cancellation processing of data, symbolic solution interweaves, channel decoding is adjudicated, and obtains the soft information of log-likelihood ratio of signal, decoding the data obtained is inputed to media Access Layer, carry out verification and data storage; Then, the information that the transmitting processing unit of via node utilizes network code to carry out between multi-source node merges, duplication code coding, symbol constellation modulation, then according to via node utilizing emitted light power, driving laser modulator, transmits data to target receiving node;
(4) second time slot reception & disposals
In the second time slot, in target receiving node receiving course, receiver module part adopts Direct Inspection Technology, first carries out opto-electronic conversion, obtains receiving the signal of telecommunication; Carry out to received signal the calculating of log-likelihood value according to maximum likelihood algorithm again; Then, utilize multi-source network decoding algorithm to carry out network decoding, and by gained likelihood value
log-likelihood ratio with the first time slot deinterleaving
merge summation, to realize collaboration diversity gain; Subsequently, by the merging log-likelihood ratio information obtaining
as the prior information of decoder, carry out decoding; Then, carry out subtraction,
, obtain outside log-likelihood value
; Then,, using the prior information of outside log-likelihood value next iteration in multi-source detection module, obtain
, be entered into deinterleaver and obtain
, so carry out iterative processing, after iteration, can obtain the multi-source information bit detecting by hard decision the last time;
Concrete steps are:
(1) computing network coding relay transmission is to the signal log-likelihood value of target receiving node:
(2) calculate the signal log-likelihood value that target receiving node obtains:
（C-2）
(3) iteration initialization
If
(C-3)
(4) iterative process
Wherein
（C-8）
Described maximum likelihood algorithm about
the formula of log-likelihood information LLR be:
The formula of described multi-source network decoding algorithm is:
Wherein:
,
; And,
,
,
,
;
symbol description:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010595774.5A CN102075288B (en) | 2010-12-20 | 2010-12-20 | Network-code-based free-space optical cooperative relay communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010595774.5A CN102075288B (en) | 2010-12-20 | 2010-12-20 | Network-code-based free-space optical cooperative relay communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102075288A CN102075288A (en) | 2011-05-25 |
| CN102075288B true CN102075288B (en) | 2014-05-21 |
Family
ID=44033646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010595774.5A Expired - Fee Related CN102075288B (en) | 2010-12-20 | 2010-12-20 | Network-code-based free-space optical cooperative relay communication method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102075288B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016150135A1 (en) * | 2015-03-26 | 2016-09-29 | 中兴通讯股份有限公司 | Data processing method and system, and relay node |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882656B (en) * | 2011-07-14 | 2015-01-21 | 华为技术有限公司 | Signal transferring method, equipment and system in multi-sourced relay network |
| CN103532623B (en) * | 2013-11-01 | 2016-06-22 | 哈尔滨工业大学深圳研究生院 | Photo-communication relay transmission method and system based on polarization shift keying modulation |
| CN104052578B (en) * | 2014-06-24 | 2017-09-26 | 东南大学 | A kind of method that repeatedly decoding is detected physical-layer network coding system suitable for full duplex |
| CN106209324B (en) * | 2016-09-18 | 2023-05-19 | 幻视互动（北京）科技有限公司 | Intelligent head display device based on multi-frequency wireless networking module realized by FPGA |
| CN107040310B (en) * | 2017-04-12 | 2019-03-22 | 山东大学 | The working method of FSO communication system based on IHDAF agreement |
| CN107465486B (en) * | 2017-06-28 | 2020-07-28 | 中国船舶重工集团公司第七一五研究所 | Cooperative coding communication method suitable for underwater acoustic network |
| CN108494484B (en) * | 2018-03-19 | 2019-12-10 | 山东大学 | Working method of indoor VLC (visible light communication) spatial modulation system based on IHDAF (Internet short message interface) protocol |
| CN109245858B (en) * | 2018-09-25 | 2021-03-23 | 重庆邮电大学 | Improved joint network-Turbo coding method based on decoding forwarding |
| CN109560820B (en) * | 2018-11-23 | 2021-07-13 | 福州大学 | Decoding simplification method combining channel coding and physical layer network coding |
| CN111277329B (en) * | 2020-01-23 | 2021-04-06 | 中国科学院空间应用工程与技术中心 | Relay system, method and chip adopting physical layer network coding |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567761A (en) * | 2009-06-04 | 2009-10-28 | 复旦大学 | Interleaving iterative multi-user communication method based on the network coding cooperative relay |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100594133B1 (en) * | 2003-08-21 | 2006-06-28 | 삼성전자주식회사 | Code Division Multiple Passive Optical Network Using Error Correction Code |
| US20080219251A1 (en) * | 2007-03-08 | 2008-09-11 | Feng Xue | Combining packets in physical layer for two-way relaying |
-
2010
- 2010-12-20 CN CN201010595774.5A patent/CN102075288B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567761A (en) * | 2009-06-04 | 2009-10-28 | 复旦大学 | Interleaving iterative multi-user communication method based on the network coding cooperative relay |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016150135A1 (en) * | 2015-03-26 | 2016-09-29 | 中兴通讯股份有限公司 | Data processing method and system, and relay node |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102075288A (en) | 2011-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102075288B (en) | Network-code-based free-space optical cooperative relay communication method | |
| Baeza et al. | A noncoherent multiuser large-scale SIMO system relying on M-ary DPSK and BICM-ID | |
| EP2795826B1 (en) | Method of transmitting a digital signal for a semi-orthogonal ms-marc system, and corresponding programme product and relay device | |
| CN101867451B (en) | Multi-user network coding communication method with high-speed parallel encoding and decoding structure | |
| EP1798920B1 (en) | Iterative detection and decoding in MIMO communication systems | |
| US8098611B2 (en) | Relay coded multi-user cooperative communications for uplink 4G wireless networks | |
| EP2795818B1 (en) | Method for transmitting a digital signal for a non-orthogonal ms-marc system, and corresponding programme product and relay device | |
| CN101567761A (en) | Interleaving iterative multi-user communication method based on the network coding cooperative relay | |
| CN103095423A (en) | Multi-user cooperative transmission method based on dimension to dimension (D2D) inter-group communication | |
| CN106506115B (en) | The apparatus and method of the soft detection of multi-user's iteration based on optimal Bayes | |
| CN103069728A (en) | Method and device for relaying in a communication network | |
| CN102088317A (en) | High speed optical transmission system and method based on TCM-64QAM code modulation | |
| Muhammad et al. | Comparison of hard‐decision and soft‐decision channel coded M‐ary PPM performance over free space optical links | |
| CN103138892A (en) | Self-adaption relay communication method based on ladder modulation | |
| Zou et al. | Low-complexity interference cancellation receiver for sparse code multiple access | |
| Kumar et al. | Evaluation of the performance of FSO system using OOK and M-PPM modulation schemes in inter-satellite links with turbo codes | |
| WO2017041626A1 (en) | Method for low complexity decision metric compression of higher-order square-qam constellation | |
| Goyal et al. | Mitigation of atmospheric turbulence in free space optics: a review | |
| CN102497250A (en) | Multiple access channel adaptive coding relay system and method | |
| CN102684815A (en) | Transmission method and transmission system for cooperative communication and relay node | |
| EP3695534A1 (en) | Signal overlay design and detection for satellite communication channels | |
| Chouhan et al. | Comparative analysis of inter satellite links using free space optical communication with OOK and QPSK modulation techniques in turbo codes | |
| Fan et al. | Design and evaluation of an IDMA cooperative relay free-space optical system | |
| Arpitha et al. | Performance analysis of channel coding techniques for cooperative adhoc network | |
| Sun et al. | Proposal of optical wireless turbo coded system with hybrid PPM-OOK signalling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20151220 |
|
| EXPY | Termination of patent right or utility model |