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Transcript of CTT
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Course Outline:
Lectures 1-15
Basics of Block Codes
(2)
Mathematical Preliminaries:
Linear Codes
(3)
Bounds on Code Mathematical Preliminaries:
groups, rings and fields
(3)
Mathematical Preliminaries:
vector spaces
(3)
Bounds on Code
Size
(2)
Standard Array
Decoding
(2)
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Convolutional
Codes
(5)
Generalized
Finite Fields
(4)
Course Outline:
Lectures 16-42
Generalized
Distributive Law
(8)
Low-Density Parity-
Check Codes
(7)
Cyclic Codes (3)
The End!The End!The End!The End!
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REFERENCES – ERROR-CORRECTING CODES
P. VIJAY KUMAR
1. Shu Lin, Daniel J.Costello, Error Control Coding - Second Edition,(often used as a coursetextbook) Pearson Education Inc. Pearson Prentice Hall, 2004.
2. W. Cary Huffman, and Vera Pless, Fundamentals of Error-Correcting Codes,(block codingemphasis) Cambridge University Press, 2010.
3. Ron M.Roth, Introduction to Coding Theory,(block coding emphasis) Cambridge UniversityPress, 2006.
4. Tom Richardson and Ruediger Urbanke, Modern Coding Theory,(emphasis on LDPC andrelated codes) Cambridge University Press, 2008.
5. F.J.Macwilliams and N.J.A.Sloane, The Theory of Error - Correcting Codes,(older but clas-sical book on block coding) North-Holland Mathematical Library, 1977.
6. Stephen B. Wicker, Error Control Systems for Digital Communication and Storage,(blockcoding emphasis) Prentice Hall Englewood Cliffs, NJ 07632, 1995.
7. Keith Chugg, Achilleas Anastasopoulos and Xiaopeng Chen, Iterative Detection:Adaptivity,Complexity Reduction, and Applications,(iterative decoding emphasis) Kluwer Academic Pub-lishers, 2001.
8. Rolf Johannesson and Kamil Sh. Zigangirov, Fundamentals of Convolutional Coding, (con-volutional coding only)IEEE Press, 1999.
9. Andrew J. Viterbi and Jim K. Omura, Principles of Digital Communication and Coding,(nicediscussion on on convolutional coding) McGraw-Hill Book Company, 2009.
10. William E. Ryan and Shu Lin, Channel Codes: Classical and Modern,(recent book treatingboth block and LDPC codes) Cambridge University Press, 2009.
11. Chris Heegard and Stephen B. Wicker, Turbo Coding,(early book on turbo codes) KluwerAcademic Publishers, 2010.
12. T. R. N. Rao and Eiji Fujiwara, Error-Control Coding for Computer Systems, Prentice Hallseries in computer engineering, Jan 1989.
13. Hideki Imai,Essentials of Error-Control Coding Techniques , Academic Press, 1990.
14. Ezio Biglieri , Dariush Divsalar , Peter J. McLane and Marvin K. Simon, Introduction toTrellis-Coded Modulation With Applications,(trellis-coded modulation) Macmillan Publishs-ing Company, 1991.
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15. V.S.Pless and W.C.Huffman, Handbook of Coding Theory : Volumes I & II,(two volumehandbook on coding theory: block and convolutional codes, allied topics) North Holland,1998.
16. Richard E. Blahut, Algebraic Codes for Data Transmission,Cambridge University Press, 2011.
17. Richard E. Blahut, Theory and Practice of Error Control Codes,Addison-Wesley PublishingCompany, 1983.
18. George C. Clark Jr. and J. Bibb Cain, Error-Correction Coding for Digital Communica-tions,(an older book, but makes for easy reading) Plenum Press, New York, June 1981.
19. Irving S. Reed and Xuemin Chen, Error-Control Coding for Data Networks , Kluwer AcademicPublishers, 1999.
20. R. J. McEliece, The Theory of Information and Coding,Cambridge University Press, 2004.
21. Elwyn R. Berlekamp, Algebraic Coding Theory Revised 1984 Edition,Aegean Park Press, 1984.
22. Stephen B. Wicker and Vijay K. Bhargava, Reed-Solomon Codes and Their Applications,IEEEPress, 1999.
23. Scott A. Vanstone and Paul C. van Oorschot, An Introduction to Error Correcting Codes withApplications,Kluwer Academic Publishers, 1989.
24. J. van Lint and G. van der Geer, Introduction to Coding Theory and Algebraic Geome-try,Birkhauser Verlag, 1989.
25. V.D.Goppa, Mathematics and Its Applications V.D.Goppa Geometry and Codes,Kluwer Aca-demic Publishers, 1988.
26. Richard B. Wells, Applied Coding and Information Theory for Engineers,Prentice Hall Infor-mation and System Sciences Series, 1998.
27. Peter Sweeney, Error Control Coding: From Theory to Practice , John Wiley and Sons, Ltd,2002.
28. Shu Lin,Tadao Kasami,Toru Fujiwara and Marc Fossorier, Trellises and Trellis-Based Decod-ing Algorithms for Linear Block Codes,Kluwer Academic Publishers, 1998.
29. H. Stichtenoth , Algebraic Function Fields and Codes,Springer-Verlag Berlin Heidelberg, 2010.
Book Chapter
30. P. V. Kumar, M. Win, H-F. Lu, C. Georghiades, “Error-Control Coding Techniques andApplications,” invited chapter in the handbook, Optical Fiber Telecommunications IV, editedby Ivan P. Kaminow and Tingye Li, Spring 2002.
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Journal Articles
31. Srinivas M. Aji and Robert J. McEliece, “Generalized Distributive Law” IEEE Trans. Inform.Theory, March 2000.
32. T. J. Richardson, A. Shokrollahi, and R. Urbanke, Design of capacity-approaching low-densityparity-check codes, IEEE Trans. Inform. Theory, vol. 47, Feb. 2001.
33. A. J. Viterbi,“Convolutional codes and their performance in communication systems,” IEEETransactions on Communications Technology, , October 1971.
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Summary of Lecture 5:
· Equivalence classes defined via cosets:○ Proof that it is an equivalence relation○ The nature of the equivalence class E_b=Hb ○ Examples:
□ integers modulo 6 and even subset□ Even parity check code
○ Elements in different cosets can be placed in 1-1 correspondence
· Rings and Fields ○ Axioms of a ring○ Ring with identity○ Commutative ring○ Integral domain ○ Division ring ○ Examples: where do we place them ?
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Lecture 6: Vector Spaces, Linear Independence and Basis
·Rings and Fields ○ Examples: where do we place them ?
Vector Spaces○ Axioms○ Examples○ Derived properties
· Subspaces○ Definition○ Example 1: plane in R^3○ Test for a subspace○ Further examples: repetition code and spc code
· Definition of a linear code○ Show how the test applies to the Hamming code (nullspace
of a matrix) ○ Point out that as far as subsets of F_2^n are concerned,
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NPTEL: Error-Correcting CodesExercises
P. Vijay KumarIndian Institute of Science
Basics of Block Codes
1. What is the smallest possible minimum distance of a block code of length n that cancorrect 2 errors and detect 5 errors ? If used only for error-detection, what is themaximum number of errors that the code can detect ?
2. A ternary code C is a code whose symbol alphabet is the set {0, 1, 2}, i.e., C is a subsetof {0, 1, 2}n. Even in {0, 1, 2}n, the definitions of Hamming weight and Hammingdistance remain as in the binary case. In the binary case, a code is a (td, tc) code iff
dmin ≥ td + tc + 1. (1)
Is this also true in the ternary case ? (The definition of a (td, tc) code remains as inthe binary case.) Justify your answer.
Mathematical Preliminaries
3. Prove that if G is an Abelian group under the operation + and H is a finite subset ofG, then H is a subgroup of G if and only if
a+ b ∈ H whenever a ∈ H and b ∈ H.
Hint: Associativity and commutativity carry over to any subset. If a ∈ H consider thelist {la | 0 ≤ l, l an integer } (la is a the sum of l copies of a). There are only a finitenumber of distinct elements in this list as H is finite. Thus l1a = l2a for some distinctintegers l1, l2. From this you should be able to conclude the existence of the identityelement and of the inverse.
4. Consider the groupG = Z4
2 = { all binary 4 tuples }
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Let H be the subgroup
H = {[0 0 0 0], [1 1 0 0], [1 1 1 1], [0 0 1 1].
Define two elements a, b ∈ G of G to be equivalent, written, a ≡ b if a + b ∈ H. Forexample,
[1 0 0 0] ≡ [0 1 0 0],
since[1 0 0 0] + [0 1 0 0] = [1 1 0 0] ∈ H.
This equivalence relation allows G to be partitioned into 4 subsets of size 4 calledequivalence classes where all the 4 elements within a subset are equivalent. Identifythe four equivalence classes and the elements that they contain.
5. Provide as best an algebraic characterization as you can (i.e., specify if it is a group, aring, a field, a vector space, etc) of the set
S = {2∑
i=2
aizi | ai ∈ F2}
endowed with the addition operation
2∑
i=0
aizi +
2∑
i=0
bizi =
2∑
i=0
cizi
where ci = ai + bi (mod 2) and with multiplication given by
2∑
i=0
aizi
2∑
i=0
bizi =
2∑
i,j=0
aibizi⊕j
where i⊕ j := i+ j (mod 3).
6. If G is a non-Abelian group having subgroup H, and if for g1, g2 ∈ G, we define g1 ∼ g2
iff g−12 g1 ∈ H, does this represent an equivalence relation. Justify your answer.
7. Identify coset representatives for the cosets of the subgroup
H = {a0 + a2x2 | a0, a2 ∈ F2}
of the group
G = {3∑
i=0
aixi | ai ∈ F2}.
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Linear Codes
8. Consider decoding of the length n = 7 repetition code using two methods:
(a) using bounded distance decoding (BDD) with dmin = 7
(b) maximum likelihood decoding (MLD) assuming that the channel is a binary sym-metric channel having crossover probability ε < 1
2
Is there a difference between the two methods when applied to this code ? Explainyour answer.
9. Write down a parity-check (p.c.) matrix for the binary linear code C whose generatormatrix is given by
G =
1 1 1 0 01 1 0 1 01 0 0 0 1
.
10. Identify a [4, 2] linear code C such that C⊥ is C itself, i.e., such that the code and itsdual are one and the same. Such codes are called self-dual codes.
11. For the purposes of this problem, let us define a linear [n, k] block code C to be system-atic if there exists a generator matrix for the code such that when the code is encodedusing that generator matrix, the first k code symbols (c0, c1, · · · , ck−1) are preciselythe k message symbols, (m0, m1, · · · , mk−1).
Under this definition, is the linear block code C having generator matrix
G =
1 1 0 1 1 1 10 1 1 0 1 1 01 0 1 0 0 1 11 0 1 1 1 0 1
a systematic code ?
Justify your answer in a few words. Show all your working.
12. Consider the linear block code C having generator matrix given by
G =
1 0 0 1 1 10 1 1 0 1 10 1 0 0 0 0
.
(a) What is the minimum distance of C ? Explain how you obtained your answer.
(b) What is the minimum distance of the dual code C⊥ ? Again, explain how youobtained your answer.
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13. Determine the minimum distance dmin of the [7, 3] linear block code C having parity-check matrix
H =
1 0 0 0 1 1 10 1 0 0 1 1 00 0 1 0 0 1 10 0 0 1 1 0 1
.
Explain your reasoning and show all your working.
14. Show that the repetition code and the parity-check code are the only possible MDScodes of length n = 7. (Hint: Start by attempting to construct an [n, k] MDS code byattempting to build up a parity-check matrix H for the code, one column at a time.Keep in mind that the parity-check matrix has n− k rows and it is required that anyn− k columns of H be linearly independent. ) Note: The same proof carries over toany length n. However, you are only required to do the case n = 7.
15. Use cosets of the linear block code C having parameters [5, 2] and generator matrix:
G =
[0 1 1 1 01 0 1 0 1
].
to partition the set F 52 , i.e., identify all cosets of C.
16. A linear block code C is used to accomplish error-correction over a Binary SymmetricChannel (BSC) with cross-over probability ε. The standard array is used to carry outmaximum-likelihood decoding (MLD) of the code. Then the probability of codeworderror Pwe can be determined
(a) just from knowing the weight distribution of the code
(b) just from knowing the list of all coset leaders,
(c) only if both the weight distribution of the code and the list of coset leaders isknown
(d) only if the entire standard array is provided.
Identify the most appropriate answer(s).
17. Use the Hamming bound to determine an upper limit to the size of a binary block codeof length n = 15 and minimum distance dmin = 7.
18. Consider the linear block code of length 5 and dimension 2 with the following generatormatrix
G =
[1 0 1 1 00 1 1 0 1
].
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(a) Choose as coset leaders the zero vector, all 5-tuples with weight 1 and {00011, 10001}.Construct the standard array together with syndromes for complete decoding.(The first row in this table should list the codewords and the first column tothe left should contain all the coset leaders. The last column should list thecorresponding syndromes. )
(b) Given that the received vector
r = [1 1 1 0 1]t,
what is the decoded codeword ? What is the residual error ? How many messagebits are in error ? You may assume that the transmitted codeword is the all-zerocodeword.
Repeat for the caser = [1 1 0 0 0]t.
Again, you may assume that the transmitted codeword is the all-zero codeword.
(c) When the code is used only for the purposes for correcting error, what is theprobability Pwe of codeword error when the crossover probability of the BSC isε = 10−4 ?
(d) On the same channel as in the previous problem, what is the probability of un-detected error if the code is used solely for the purposes of error detection ?
(e) With systematic encoding, the codeword corresponding to the message vector[m0, m1], is given by [m0, m1, p0, p1, p2]. On the same channel as in theprevious problem, what is the probability that the first message symbol will bein error if the code is used solely for the purpose of error correction ?
(f) On the same channel as in the previous problem, what is the probability thatof the two message bits [m0, m1], only the second message bit m1 is decodedincorrectly ?
19. Let C be an [n, k, d] linear code having (k × n) generator matrix G. Prove that anycollection of n−d+1 columns selected from the n columns of G is a linearly independentset.
20. The covering radius of a linear [n, k] code C is the smallest integer ρ such that for anyx ∈ Fn2 , there exists a codeword c ∈ C such that
dH(c, x) ≤ ρ.
(a) How would you determine ρ from a standard array decoding table of the code ?
(b) How would you determine ρ from inspection of the parity-check matrix H of thecode ?
(c) What is the covering radius of the [7, 4, 3] Hamming code ?
21. Derive the analogue of the Hamming bound as it applied to ternary codes, i.e., to codeshaving the ternary alphabet {0, 1, 2}.
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Convolutional Codes
22. In the field of of formal power series F2[[D]], find the first 7 terms in the power-seriesexpansion of
(a) 11+D2
(b) D1+D+D2
(c) D2
1+D2+D5
23. Determine whether the convolutional codes encoded using the G(D) below given beloware catastrophic. If so, find an infinite weight input sequence that generates a codewordof finite weight.
(a) G(D) = [1 +D +D3, 1 +D +D2, 1 +D2 +D3].
(b) G(D) = [1 +D3, 1 +D +D2 +D4, 1 +D2 +D3 +D4].
Hint: The irreducible polynomials of degree ≤ 3 over GF (2) are listed below:
degree 1: D, 1 +Ddegree 2: 1 +D +D2
degree 3: 1 +D +D3, 1 +D2 +D3 .
24. Consider the rate 1/2 convolutional code with
G(D) = [1 +D +D2 1 +D2].
(a) Draw a complete trellis diagram up to node level 6 (beginning at node level 0).Label all branches with code symbols.
(b) Use the trellis to determine the free distance dfree of the code.
(c) If the received sequence (across a BSC) is
r = (01 00 01 00 00 00 . . . ...)
find (the information sequences associated to) all survivors at node level 6.
(d) If the received sequence (across an AWGN channel) is
r = (4 − 1 − 3 2 6 − 5 2 4 5 3 5 5 . . . ...)
find (the information sequences associated to) all survivors at node level 6.
25. Consider a rate 1/3 convolutional code with
G(D) = [1 +D 1 +D2 1 +D +D2].
(a) Draw the state diagram for the encoder.
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(b) Compute the generating function AF (L = 1, D, I)
(c) Use this generating functon to determine the free distance dfree of the code.
26. Will the choice of generator matrix,
G(D) =[
1 +D +D2 +D3, 1 +D2 +D3 +D5, 1 +D4],
cause the associated convolutional code C to exhibit catastrophic error propagation ?
Explain fully your answer.
27. This question pertain to convolutional codes of rate 1n, with m memory elements in the
encoder that are required to encode a given set of N message symbols {ui}N−1i=0 that
are i.i.d, and equally likely to be 0 or 1. Under the conventional encoding of messagesymbols using a terminated convolutional code, the convolutional encoder is forced tobegin and end at the all-zero state. In encoding using a “tail-biting” however, the onlyrestriction that is placed is that the encoder is required to begin and end at the samestate, but this state could be any of the possible encoder states. Derive an expressionfor the exact rate of the convolutional code when operated in tail-biting fashion. [Hint:How many code symbols does the tail-biting convolutional encoder need to transmit ?]
The Generalized Distributive Law
28. Consider the “min-star” semi-ring ((−∞,∞], min∗, +) in which the min∗ operationis given by:
∗min(x, y) := −ln(e−x + e−y).
(a) Identify the identity element under the min-star operation
(b) Verify that the distributive law holds.
29. Consider the single parity-check code of length 3 having parity check matrix H =[1 1 1]. Thus vT = [v1, v2, v3] is a codeword if and only if Hv = 0. In acertain instance, when communicating over a binary symmetric channel (BSC) havingcrossover probability ε < 0.5, the received vector was found to be
yT = [0 1 0].
Use the GDL to carry out ML code-symbol decoding of this code. Show all intermediatesteps
(a) the formulation as an MPF problem
(b) the junction tree
(c) the message-passing schedule and the messages passed
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(d) the result of decoding
30. Consider the rate 12
convolutional code having polynomial generator matrix
G(D) = [1, 1 +D].
On a certain transmission, two message symbols u0 and u1 were encoded using thecode and then transmitted across a binary symmetric channel (BSC) having crossoverprobability ε < 1
2. The corresponding received symbols were
yT = [01 01].
Use the GDL and the junction tree shown below to carry out maximum aposteriori(MAP) decoding of ONLY the message bit u1. (Note that the encoder is NOT returnedto the all-zero state, i.e., there are no tail bits inserted into the message stream).
Show ALL intermediate steps and all your working clearly.
S0
U0, S0, S1 U1, S1U0, S0
U0 U1
Figure 1: Junction Tree associated to the convolutional code.
31. Write down the distributive law as it applies to the semi-rings numbered 5,6,8,9 inTable I of the “GDL paper” (the paper by Aji and McEliece).
32. Read Example 2.2 of the “GDL paper” and determine the savings in computationbetween using the brute force approach to computing the 8 transform coefficientsF (x1, x2, x3) and the approach that makes intelligent use of the distributive law.
33. Consider the rate 1/2 convolutional code with
G(D) = [1 +D +D2 1 +D2].
If the received sequence (across a discrete memoryless AWGN channel) is
r = (4 − 1 − 3 2 6 − 5),
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use the GDL algorithm to implement minimum probability of bit error decoding of themessage bits u0, u1, u2. Show all your working including the graphs that you use andthe message passing schedule.
34. Consider decoding the [7, 4, 2] linear block code for the case when the received vectoracross a binary symmetric channel with crossover probability ε << 1, is the vector
y = [1 0 0 0 0 0 0 ]T .
Use the GDL to make decisions based on maximizing the aposteriori probabilities
p(ui/y)
of the code symbols ui, i = 1, 2, 3, 4, 5, 6, 7 .
35. Verify that the min∗ sum semi-ring is in fact a semi-ring, starting from the defintionof the min∗ operation:
min∗(x, y) = min{x, y} − ln(1 + e−|y−x|) = −ln(e−x + e−y).
Identify the underlying set and the identity element under the min∗ operation.
36. Set up a schedule for computing the objective function at vertex W for Example 2.4of the GDL paper. Draw the corresponding message trellis.
37. Write down the distributive law as it applies to the semi-rings numbered 9,10 in TableI of the “GDL paper” (by Aji and McEliece).
38. Set up an efficient message-passing schedule for computing the objective function atvertex W for Example 2.4 of the GDL paper, i.e., identify the sequence in which youwould pass messages.
39. In the computation:
β(x3) =∑
x1, x2, x4, x5
f(x1)g(x2)h(x1, x2, x3)p(x3, x4)q(x3, x5),
all the variables xi, i = 1, 2, 3, 4, 5 take on values from an alphabet A of size | A |= q. Ifyou were to reorganize this expression to minimize the number of operations (additionsand multiplications), how would you do it and how many operations would you endup needing ?
40. Consider the problem of computing
F (x1) =9∑
x2=0
9∑
x3=0
9∑
x4=0
f(x2, x3, x4)g(x3, x4)h(x1, x2, x4).
The functions f(·), g(·),h(·), are all real-valued functions.
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(a) It is desired to pose this problem as a marginalize a product function problem.Identify the corresponding universal set, the corresponding local domains and thelocal and global kernels.
(b) Organize if possible these local domains into a junction tree. Make clear all yourworking.
41. Consider maximum-likelihood code-symbol decoding of the binary block code havingparity check matrix H given by
H =
1 1 0 1 0 0 00 0 1 1 0 1 00 0 0 1 1 0 1
.
Thus all codewords c = [c1, c2, c3, c4, c5, c6, c7]T , satisfy Hc = 0. The decoding problem
when posed as an marginalize-a-product function problem, leads to the graph shown inFig. 2. Use the distributive law in conjunction with this graph, to efficiently computethe probabilities Pr(c4 = 0/r) and Pr(c4 = 1/r) where the received vector r is givenby r = [1111111]T . You may assume that the channel is a binary symmetric channel(BSC) having crossover probability 0 < ε << 1.
A suggested approximation In your computations, you will run into expressionsof the form
aiεi + ai+1ε
i+1 + ai+2εi+2 + · · · + ai+kε
i+k,
where i ≥ 0, k ≥ 0 and the ai are integers ≤ 10. It is suggested that whenever youencounter such an expression, you make the approximation
aiεi + ai+1ε
i+1 + ai+2εi+2 + · · · + ai+kε
i+k ≈ aiεi.
42. Consider the joint probability function
p({ui}3i=0, {si}4i=0, {yi}3i=0) = p(s0)3∏
i=0
p(ui)p(si+1/si, ui)p(yi/si, ui)
associated with a convolutional code. As in class the {ui ∈ {0, 1}} represent the binarymessage symbols, the {si} is the state sequence and {yi} are the received symbols.Consider the problem of maximum-likelihood code-symbol decoding of this code, i.e.,of computing p(uk/{yi}3i=0), 0 ≤ k ≤ 3.
(a) Present this as an MPF problem,
(b) organize the local domains into a junction tree
(c) show that message passing can be organized into a forward wave and a backwardwave and that the forward wave is in essence, a sequence of matrix multiplications
Note: It is NOT necessary to do anything beyond what is asked above!
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1
3
6
2
4
5 346
124
7
457
A
B C
Figure 13: Example of junction tree.
corresponding to the local domains {1, 2, 4}, {3, 4, 6}, and {4, 5, 7}, respectively. Fig. 13shows the local domains organized into a junction tree. We are interested here in computingthe objective functions at all vertices Vi, i = 1, . . . , 7. With regard to the message schedule,we will adopt an inward-outward schedule in which the outlying vertices send their messagesinward first. Once the innermost vertex V4 has acquired knowledge of all the local kernels,the outward phase of message passing begins. The validity of this message schedule can beverified with the aid of a message trellis if desired. The messages passed are as follows:
Phase 1
µ1,A(S1) = α1(x1) ⇒ µ1,A
:=
[µ 1,A(0)µ1,A(1)
]=
[1θ
]= µ
6,B= µ
7,C. (119)
Similarly,
µ2,A
=
[θ1
]= µ
3,B= µ
5,C. (120)
Phase 2µA,4(x4) =
∑
x1,x2
µ1,A(x1)µ2,A(x2)χA (x1, x2, x4) . (121)
Since χA(x1 + x2 + x4) = 0 for x4 6= x1 + x2, we have
µA,4(0) =∑
x1+x2=0
µ1,A(x1)µ2,A(x2) = µ1,A(0)µ2,A(0) + µ1,A(1)µ2,A(1) = θ + θ = 2θ. (122)
Similarly, µA,4(1) = 1+θ2, which implies µA,4
=
[2θ
1 + θ2
]. Also, µ
C,4=
[2θ
1 + θ2
]= µ
B,4.
Phase 3µ4,A(x4) = µB,4(x4)µC,4(x4)α4(x4). (123)
55
Figure 2: Junction Tree associated to the [7, 4, 2] code..
LDPC Codes
43. In the density evolution analysis of (dv, dc)-regular LDPC codes, where the goal is todetermine the evolution of the density of number of incorrect messages passed betweenvariable nodes and check nodes, it is customary to assume that the all-1 codeword istransmitted. What are the assumptions on the channel and the processing carried outat the variable and check node under which this assumption is valid ? Explain youranswer while making clear any notation that you introduce.
44. Derive from first principles, the transformation of densities that takes place during aniteration at a check node.
45. Consider density evolution associated to Gallager Decoding Algorithm A applied toan LDPC code C. Thus the channel is a BSC with cross-over probability ε << 1 andall messages passed are either 1 or −1. You may assume that the neighborhood ofevery node in the Tanner graph of C is tree-like to depth 8. What is the probabilityp
(1)−1that at the end of iteration 1, the message passed from a variable node to check
node will be in error. Notation is as in class. Following an initial round of messagepassing, from the variable nodes to check nodes, based only on channel inputs, eachsubsequent iteration is composed of two rounds of message passing: from check nodeto variable node followed by from variable node back to check node. Show all your
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working clearly. You may use the fact that ε << 1 to simplify calculations. Hence aε2
for integer constants a < 100 (say) may safely be ignored in comparison with ε, etc.
46. Consider the variation of belief propagation decoding of binary LPDC codes in which,in place of beliefs, the messages passed correspond to log-likelihood ratios (as discussedin class).
(a) Identify (it is not necessary to derive them) the variable and check node maps
ψ(0)v (l0), ψ
(l)v (l0, l1, l2, . . . , ldv−1), ψ
(l)c (l1, l2, . . . , ldc−1).
(b) Do these maps satisfy the variable-node and check-node symmetry conditionswhich (along with the channel symmetry condition) permit us to conclude thatthe number of incorrect messages passed is the same regardless of the transmittedcodeword ? Make clear your reasoning
47. Is the computational tree associated with variable node 11 (at the top of the graphand incorrectly labelled as node 10 :-) ) in the Tanner graph in Fig. 3 of a certainLDPC code a junction tree ? If so, identify the associated MPF problem along withthe local domains and the local kernels. What is the objective function being computedif messages are passed as indicated by the arrows ?
Figure 3: Computational tree associated to node 10 in Tanner Graph.
48. (a) In the context of the performance analysis of LDPC codes, state (in terms ofthe notation introduced in class), the variable and check-node symmetry assump-tions that go into showing that the probability of passing an incorrect message isindependent of the transmitted codeword.
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(b) Show clearly that the check-node symmetry condition holds when LDPC codesare decoding using belief propagation with log-likelihood ratios (LLR) in place ofbeliefs.
Finite Fields & Cyclic Codes
49. Use the Euclidean division algorithm (EDA) to determine the gcd of 6711 and 831.Express the gcd as a linear combination u ∗ 6711 + v ∗ 831 of 6711 and 831.
50. Find the inverse of 7 modulo 13 using the EDA.
51. Identify all primitive elements of the finite fields of size 7 and 13 (the finite field of size13 is the set of all integers modulo 13).
52. Over GF (2), compute if possible, the inverse of (1 + x) modulo (1 + x+ x2 + x3 + x4).
53. Let α be a primitive element of GF (64). Identify all the elements in all the subfieldsof GF (64) in terms of α.
54. Use the irreducible polynomial (irreducible over GF (5)) x2 +x+2 to construct a finitefield of 25 elements. If α denotes a root of x2 + x+ 2, then α is known to be primitivein GF (25). Set up an add-1 table for GF (25). Identify the 5-cyclotomic cosets modulo24. Find the minimal polynomials of all elements in the field. Compute the product ofall the minimal polynomials (each distinct polynomial is taken just once) including theminimal polynomial x of the zero element. Which powers of α constitute the subfieldGF (5) of GF (25) ?
55. Identify the 3-cyclotomic cosets modulo 26 as well as the 2-cyclotomic cosets modulo19.
56. Let α be a primitive element of GF (26). Identify all the correct answers below with a√
• α + α4 ∈ GF (4)
• α + α8 ∈ GF (8)
• none of the above
57. The polynomials over GF (2) given below are all irreducible. Identify with a√
, allthose having the property that all of their zeros are contained in GF (256).
• x2 + x+ 1
• x3 + x2 + 1
• x4 + x3 + 1
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• x5 + x2 + 1
• x6 + x+ 1
• x8 + x6 + x5 + x4 + 1
58. Identify the smallest finite field of characteristic 2 that contains a primitive 17-th rootof unity.
59. In the notation used in class with regard to finite field Fourier transforms, let q = 2,N = 15 and α be a primitive element of F16 satisfying α4 + α + 1 = 0. Let
(s(t), t = 0, 1, 2, . . . , 14) = 000110000101101 .
Compute the Fourier transform s(λ) of s(t). Compute also the Fourier transform ofs(t) + s(t+ 2).
60. In the notation used in class with regard to finite field Fourier transforms, let q = 2,N = 15 and α be a primitive element of F16 satisfying α4 + α + 1 = 0. Determinethe basic sequence b(t) of “frequency” λ = 6. Determine the Fourier transform of thesequence c(t) given by c(t) = b(2t), 0 ≤ t ≤ 14.
61. Consider the binary (i.e., q = 2) cyclic code of length N = 15 consisting of all binarycodewords (c(t), 0 ≤ t ≤ 14) satisfying
C = {c(t) | c(λ) = 0, λ = 0, 7, 14, 13, 11}.
Transforms are computed using a primitive element of GF (16) satisfying α4+α+1 = 0.Find a codeword B(t) ∈ C such that every codeword c(t) in C can be expressed as alinear combination of cyclic shifts of B(t), i.e., can be expressed in the form
c(t) =14∑
t=0
u(τ)B(t− τ)
where u(τ) ∈ {0, 1},∀τ .
62. Determine the number of binary sequences {at} of period N = 15 that satisfy thecondition
aλ ∈ {0, 1}, all λ, 0 ≤ λ ≤ 14.
63. Let q = 2 and N = 23. What is the order m of q (mod N) ? Let α be a primitiveN -th root of unity lying in GF (2m). Determine the dimension of the binary q = 2cyclic code of length N = 23 all of whose codewords c(t) satisfy
c(λ) = 0, λ = 1 .
64. Why are there no interesting linear, cyclic binary codes of length N = 19 ?
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65. Design a single-error correcting, double-error detecting binary linear, cyclic code oflength 21. Naturally you would like to have dimension k as large as possible.
66. Identify the null spectrum of a Reed-Solomon (RS) code over GF (9) code of lengthN = 8 and designed distance dmin = 6.
67. How many distinct binary cyclic codes of length 41 are there ? (Include in your count,the cyclic code corresponding to the set of all binary 41-tuples as well as the cycliccode consisting of just the all-zero codeword).
68. Consider the binary cyclic code C of lengthN = 15 with null spectrum {1, 2, 3, 4, 5, 6, 8, 9, 10, 12}.You may assume that transforms are computed using primitive element α ∈ GF (16)satisfying α4 + α + 1 = 0.
Does the all-one codeword (1, 1, . . . 1, 1) belong to the cyclic code C ? Explain youranswer.
69. Use the irreducible polynomial (irreducible over F3) x2 + x + 2 to construct a finite
field of 9 elements. If α denotes a root of x2 + x+ 2, then α is known to be primitivein F9.
(a) Set up an add-1 table for F9.
(b) Identify the 3-cyclotomic cosets modulo 8.
(c) Find the minimal polynomials of all elements in the field.
70. Use the Mobius inversion formulae to determine the number of irreducible polynomialsof degree 12 over the binary field F2 .
71. If α, β in F16 have orders a, b, then is it always true that αβ has order = lcm(a, b) ?Justify your answer.
72. (a) How many binary cyclic codes of length 23 are there ?
(b) Design a double-error-correcting cyclic code of length 23 and identify its dimen-sion.
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