Configuration of Nonbinary LDPC Codes for Different Recieving wire Transmission Rong-Hui Peng and Rong-Rong Chen Divisio.


69 views
Uploaded on:
Category: Sales / Marketing
Description
Nonbinary LDPC code outline has been considered for AWGN and shows preferred execution over parallel codes [2] ... Expand EXIT graph based code outline techniques to nonbinary iterative ...
Transcripts
Slide 1

Outline of Nonbinary LDPC Codes for Multiple-Antenna Transmission Rong-Hui Peng and Rong-Rong Chen Department of Electrical and Computer Engineering University of Utah This work is bolstered partially by NSF under gift ECS-0547433 .

Slide 2

Outline Motivation Two nonbinary LDPC coded framework Non-iterative framework Iterative framework Code plan for iterative framework Simulation results Conclusion

Slide 3

Motivation MIMO framework has been generally used to build framework limit LDPC codes can be utilized to approach the MIMO channel limit S. ten Brink, G. Kramer, and A. Ashikhmin study the twofold LDPC code plan for MIMO [1]. Nonbinary LDPC code plan has been considered for AWGN and shows preferred execution over twofold codes [2]. [1] S. ten Brink, G. Kramer, and A. Ashikhmin, " Design of low-thickness equality check codes for balance and identification, " IEEE Trans. Commun. ,vol. 52, pp. 670 – 678, Apr. 2004 . [2] A. Bennatan and D. Burshtein, " Design and examination of nonbinary LDPC codes for discretionary discrete-memoryless channels, " IEEE Trans. Advise. Hypothesis , vol. 52, pp. 549 – 583, Feb. 2006.

Slide 4

Motivation Our commitment The principal work to apply sporadic nonbinary LDPC to MIMO channel Propose two nonbinary LDPC coded MIMO frameworks. Amplify EXIT outline based code plan strategies to nonbinary iterative frameworks Provide examination with ideal parallel LDPC coded frameworks

Slide 5

x 1 x 2 x 3 x 4 x 5 x 6 x 7 c 1 c 2 c 3 + Variable Nodes check Nodes Introduction of paired LDPC A subclass of straight piece codes Specified by an equality check lattice (n-k) × n : code length k : length of data succession

Slide 6

Definition of nonbinary LDPC For nonbinary codes, the ones in equality check grid are supplanted by nonzero components in GF( q )

Slide 7

Application to MIMO Channel model Assume every passage of channel network is free, takes after Rayleigh blurring, and is known by recipient

Slide 8

Non-iterative framework: the discovery is performed just once. R.- H. Peng and R.- R. Chen, " Application of nonbinary ldpc codes for correspondence over blurring channels utilizing higher regulations, " to show up: Proc. IEEE Globecom " 06 . Framework square graph Iterative framework: Soft messages are traded amongst identifier and decoder iteratively.

Slide 9

Code outline for iterative framework Irregular codes can accomplish much preferable execution over general codes Density development and EXIT graph are two broadly utilized techniques to plan paired sporadic codes. As such, plan of nonbinary codes is constrained to AWGN channel We concentrate on the code outline for iterative MIMO framework in view of EXIT diagram technique EXIT graph is following the delicate message changed amid cycles utilizing common data .

Slide 10

+ Variable Nodes check Nodes Binary LDPC code outline Three sorts of delicate messages Channel message Variable to Check message Check to Variable message Assumption: All messages are Gaussian circulated EXIT capacity portray the connection of information message and yield message as far as shared data. From channel

Slide 11

Variable to Check Message + from channel Variable hub decoder (VND) + Repetition code VND EXIT capacity:

Slide 12

Check to Variable Message Check hub decoder (CND) + Single equality check code CND EXIT capacity:

Slide 13

Code plan utilizing EXIT outline EXIT capacity for MIMO Detector can be assessed by Monte Carlo recreation Construct joined EXIT capacity of finder and VND The EXIT capacity of sporadic codes is a direct blend of the EXIT capacity of customary codes

Slide 14

Code outline utilizing EXIT diagram To guarantee fruitful interpreting, VND/DET EXIT bend ought to lie above CND EXIT bend To approach limit, VND/DET EXIT bend ought to coordinate CND EXIT bend Code configuration should be possible by bend coordinating A. Ashikhmin,G. Kramer and S. ten Brink " Extrinsic Information Transfer Functions: Model and Erasure Channel Properties," IEEE Trans. Advise. Hypothesis ., vol.50, Nov. 2004.

Slide 15

Challenges of nonbinary code plan Soft message in twofold framework is LLR. Delicate message in nonbinary framework is a vector-LLRV indicate the log-probability proportion of being one component in GF( q ).

Slide 16

Challenges of nonbinary code outline It is more mind boggling to assess the common data as a result of the multi-dimensional incorporation of the delicate message Only total of check to variable messages can be displayed as Gaussian vector with mean m and fluctuation Other messages might be assessed by Monte Carlo recreation

Slide 17

Generating of the EXIT bends utilizing open-circle framework

Slide 18

Generating of the EXIT bends utilizing open-circle framework For every We figure : is more exact, subsequent to no Guassian assuption is made.

Slide 19

Generating of the EXIT bends utilizing open-circle framework Comparison of two VND/DET EXIT bends

Slide 20

GF(16) most minimal many-sided quality, better execution, than GF(2) GF(256) best execution, close multifaceted nature with GF(2) Simulation results

Slide 21

Conclusion Application of nonbinary LDPC codes for iterative and noniterative MIMO framework are examined Code outline for nonbinary LDPC coded iterative framework is proposed Nonbinary LDPC codes accomplish preferred execution and lower many-sided quality over the ideal double LDPC codes and along these lines are great hopeful of MIMO framework. Future work Low many-sided quality interpreting calculation Code development with direct encoding

Slide 22

Thanks !

Recommended
View more...