JPH01101742A - Error correcting circuit - Google Patents

Error correcting circuit

Info

Publication number
JPH01101742A
JPH01101742A JP25924787A JP25924787A JPH01101742A JP H01101742 A JPH01101742 A JP H01101742A JP 25924787 A JP25924787 A JP 25924787A JP 25924787 A JP25924787 A JP 25924787A JP H01101742 A JPH01101742 A JP H01101742A
Authority
JP
Japan
Prior art keywords
error
error correction
comparison
polynomial
expression
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.)
Pending
Application number
JP25924787A
Other languages
Japanese (ja)
Inventor
Akira Shiosaki
汐崎 陽
Katsufumi Suzuki
鈴木 克文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CSK Corp
Original Assignee
CSK Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CSK Corp filed Critical CSK Corp
Priority to JP25924787A priority Critical patent/JPH01101742A/en
Publication of JPH01101742A publication Critical patent/JPH01101742A/en
Pending legal-status Critical Current

Links

Landscapes

  • Error Detection And Correction (AREA)

Abstract

PURPOSE:To execute error correction with comparatively small computing quantity by having an operating means to execute addition, multiplication and division on a finite field, obtaining the degree of a polynomial, judging the relation of sizes with a constant determined in advance and executing the repeating operation of Euclidean algorithm to obtain a greatest common divisor. CONSTITUTION:In an error correcting circuit using a remainder polynomial code based on reminder theorem by a Chinese mathematician, an operating means 1 is obtained to execute the addition, multiplication and division on a finite field GF(2<m>) [(m) is a >=1 integer]. When a code V' is received, a decoding device obtains an expression F'(x) and a degree deg[F'(x)] by the operating means 1. This obtained deg[F'(x)] is compared with a number kd, which is determined in advance by a comparing means 2. As the result of the comparison, when the deg[F'(x)] is smaller than kd, it is judged to be 'there is no error' and F'(x) is adopted as expression F(x) as it is. As the result of the comparison, when the deg[F'(x)] is larger than kd, it is judged as 'there is an error' and the output of an error correcting means 3 receiving F'(x) is adopted as the expression for F(x). Thus, with the comparatively small operating quantity, the error can be corrected.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、データ通信システム等において使用される符
号の誤り訂正回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a code error correction circuit used in data communication systems and the like.

[従来の技術] 従来、符号の訂正方式に関して、J、J、5toneの
示した、中国人の剰余定理に基いた誤り訂正符号(以下
、ストーン符号という)かある。
[Prior Art] Conventionally, as a code correction method, there is an error correction code (hereinafter referred to as a "Stone code") based on the Chinese remainder theorem shown by J, J, 5tone.

ストーン符号は、かなり広範囲の符号を含み、整数環の
上でも、また多項式環の上でも構成できる。いずれの場
合も、原理は同じであり、以下では、有限体GF(2m
) (mは1以上の整数)上の多項式を用いて定義され
る符号の構成法を示す。
Stone codes include a fairly wide range of codes and can be constructed on rings of integers as well as on polynomial rings. In either case, the principle is the same, and below, the finite field GF (2m
) (m is an integer greater than or equal to 1) This shows how to construct a code defined using the polynomial.

有限体GF(2m)の元からなる長さkXd (k、d
:整数)の情報記号列を。
Length kXd (k, d
: integer) information symbol string.

(IL o、 JL r、 jL、t、…pLhd−+
)とし、有限体GF(2’″)上の互いに素なn個のd
次多項式を、 (m、(x)、 m、(x)、 ・・・、mn(x))
としたとき、 F(x)= JL Q+JL +X+ JL 2X2+
−+g @6−、X”−’に対して、 鳳1(X)によ
るF(x)の剰余at(X) EF(x) (mood
 at(x))  (+−1,2,−−−、n)を求め
、 V−(at(x)、 at(x)、 −、an(x) 
)   −(1)を符号とする。
(IL o, JL r, jL, t,...pLhd-+
), and n disjoint ds on the finite field GF(2''')
The degree polynomial is (m, (x), m, (x), ..., mn(x))
When, F(x)= JL Q+JL +X+ JL 2X2+
-+g @6-,
at(x)) (+-1, 2, ---, n), V-(at(x), at(x), -, an(x)
) −(1) is the sign.

復号は1次式によりF(x )を計算することにより行
われる。
Decoding is performed by calculating F(x) using a linear equation.

F(x)ミΣ (閘(x)/11+(x))t+(x)
at(x)(mod M(x))ここに、 M(x)= rI ml(X) であり、t+(x)は、 (M(x)/+w+(x))t+(x)  E  1(
IIod  ml(x))−(z)を満足する最小次数
の有限体GF(2’″)上の多項式である。
F(x)miΣ (lock(x)/11+(x))t+(x)
at(x) (mod M(x)) where M(x)=rI ml(X) and t+(x) is (M(x)/+w+(x))t+(x) E 1 (
It is a polynomial on the finite field GF(2''') of the minimum degree that satisfies IIod ml(x))-(z).

ここで、符号Vに誤りか生じた場合についても、次の手
段により正しく復号することかできる。 幾つかのm、
(x)の積をM’ (x)としたとき、deg[F(x
)](deg[M’(x)](deg[F(x)]はF
 (x)の次数を表わす)となるすべてのM’ (x)
について、上記の式と同様にF(x)を求め、多数決を
とる。
Here, even if an error occurs in the code V, it can be correctly decoded by the following means. some m,
When the product of (x) is M' (x), deg[F(x
)](deg[M'(x)](deg[F(x)] is F
(representing the order of (x))
, F(x) is found in the same way as the above equation, and a majority vote is taken.

これにより、誤り訂正を行うことができる。This allows error correction to be performed.

[発明か解決しようとする問題点] 上記のような多数決をとることによる復号法の場合、誤
り訂正能力を高くすると計算量か莫大なものとなり、実
用性に欠けるという問題かあった。
[Problems to be Solved by the Invention] In the case of the above-mentioned decoding method based on majority voting, there is a problem that increasing the error correction ability results in an enormous amount of calculation, making it impractical.

したがって1本発明は、上記問題点の解決を図り、比較
的少ない計算量で誤り訂正を行う誤り訂正回路を提供す
ることを目的とする。
Therefore, one object of the present invention is to solve the above problems and provide an error correction circuit that performs error correction with a relatively small amount of calculation.

[問題点を解決するための手段] 上記目的を達成するために、本発明は、中国人の剰余定
理に基いた剰余多項式符号を用いた誤り訂正回路におい
て、 有限体GF(2m) (mは1以上の整数)上での加算
、乗算および除算を行う演算手段と、多項式の次数を求
めて、予め定めた定数との大小関係を判断する比較手段
と、 最大公約数を求めるユークリッドの互除法の繰返し演算
を行う誤り訂正手段とを備え、エラー位置およびエラー
値を求めることなく復号をおこなうようにしたものであ
る。
[Means for Solving the Problems] In order to achieve the above object, the present invention provides an error correction circuit using a remainder polynomial code based on the Chinese remainder theorem. arithmetic means for performing addition, multiplication, and division on (integers greater than or equal to 1), a comparison means for determining the degree of a polynomial and determining its magnitude relationship with a predetermined constant, and Euclid's mutual division method for determining the greatest common divisor. The decoding device is equipped with an error correction means that performs repeated calculations, and decoding is performed without determining the error position and error value.

C作用] このような構成において、上記(1)式て与えられる符
号Vに対し、誤りが生じた符号を、V”(a+’(X)
、 a2°(x)、−、an’(x) )として、上記
演算手段により、次式の計算を行う。
C action] In such a configuration, for the code V given by equation (1) above, the code in which an error has occurred is expressed as V"(a+'(X)
, a2°(x), -, an'(x) ), the following equation is calculated by the above calculation means.

F’ (x) ミΣ(M(x)/m;(x))t、(x)at’(x)
(IIod M(x))・・・(3) つぎに、上記比較手段による比較の結果。
F' (x) MiΣ(M(x)/m; (x))t, (x)at'(x)
(IIod M(x))...(3) Next, the results of comparison by the above comparison means.

deg[F’(x)]  <  kd        
               =(4)ならば、Vo
には誤りは生じておらず、F(x)=F’ (x) である。逆に、 deg[F’ (x)]  ≧ kd        
  −(4)ならば、上記誤り訂正手段により、ユーク
リッドの互除法を用いた繰返し演算を行うことによりV
deg[F'(x)] < kd
= (4), then Vo
There is no error in F(x)=F'(x). On the contrary, deg[F' (x)] ≧ kd
- (4), then the above error correction means performs an iterative operation using Euclidean's algorithm, so that V
.

が(n−k)/2個までの誤りを含む場合の誤りを訂正
することができる。その手順を以下に示す。
It is possible to correct errors in the case where the value contains up to (n-k)/2 errors. The procedure is shown below.

■ r−+(x)*M(x) 、 r、(x)=F’(
x)。
■ r−+(x)*M(x), r,(x)=F'(
x).

s−+(x)J 、 5o(x)=1.1I11とする
Let s-+(x)J, 5o(x)=1.1I11.

を満足するqt(x)および「、(x)を求める。Find qt(x) and ``,(x) that satisfy .

■ 5t(x)=s+−g(x)−qt(x)s+−+
(x)  −(a)で与えられるs、(x)を求める。
■ 5t(x)=s+-g(x)-qt(x)s+-+
Find s and (x) given by (x) - (a).

■1)  deg[r+(x)]≧ (n−t)dのと
き、i麿i+1 として■に戻る。
■1) When deg[r+(x)]≧(nt)d, return to ■ as i+1.

2)  deg[r+(x)]  ((n−t)dのと
き、F(x)= r+(x) / 5t(x)    
 −(7)により、F(x)を求める。
2) deg[r+(x)] (When (nt)d, F(x)=r+(x)/5t(x)
- Find F(x) using (7).

ここに、tはnとkにより定まる訂正可能な誤りの個数
であり、 n−に≧2t である。
Here, t is the number of correctable errors determined by n and k, and n-≧2t.

本発明の誤り訂正回路によれば、エラー位置およびエラ
ー値を求めることなく誤りを訂正することができる。
According to the error correction circuit of the present invention, errors can be corrected without determining the error position and error value.

[実施例] 以下、図面を参照しながら本発明の実施例について詳細
に説明するっ 〈実施例の構成〉 第1図に、本発明に係る復号装置の基本構成の一例を示
す。
[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. <Configuration of the embodiment> FIG. 1 shows an example of the basic configuration of a decoding device according to the present invention.

この装置は、符号V′を受けて上記(3)式て示したF
’(x)  (およびdeg[F’ (x)])を求め
る演算手段1と、上記(4)式で示したように、deg
[F’ (x)]とkdとの大小比較を行う比較手段2
と、この比較手段2により「誤りあり」と判断されたと
き、F’ (x)を受けて誤りを訂正する誤り訂正手段
3を備える。
In this device, F
'(x) (and deg[F' (x)]) and deg
Comparison means 2 for comparing the magnitude of [F' (x)] and kd
Error correction means 3 is provided which receives F' (x) and corrects the error when the comparison means 2 determines that there is an error.

第2図に、第1図の誤り訂正手段3の具体的回路構成を
示す。
FIG. 2 shows a specific circuit configuration of the error correction means 3 shown in FIG. 1.

この回路は、上記(5)式で示されるqI(x)および
r、(x)を求める演算を行う演算回路4 、rl−□
(×)およびr+−g(X)を保持するメモリ(または
レジスタ)5、上記(6)式で示されるs、(x)を求
める演算を行う演算回路6、s、−+(X)およびst
−g(x)を保持するメモリ(またはレジスタ)7、上
記手順■に示す大小比較を行う比較回路8、および上記
(7)式て示されるF(x)を求める演算を行う演算回
路9からなる。
This circuit is an arithmetic circuit 4, rl-□ which performs calculations to obtain qI(x) and r,(x) shown in equation (5) above.
(x) and r+-g(X), a memory (or register) 5, an arithmetic circuit 6 for calculating s, (x) shown in equation (6) above, s, -+(X), and st
- from the memory (or register) 7 that holds g(x), the comparison circuit 8 that performs the magnitude comparison shown in the above procedure Become.

〈実施例の作用〉 まず、第1図の復号装置の動作を説明する。<Effect of the embodiment> First, the operation of the decoding device shown in FIG. 1 will be explained.

復号装置は、符号V′を受けると、演算手段lにより、
F’ (x)および次数deg[F’(x)]を求める
。この求められた次数deg[F’(X月を、比較手段
2により予め定められた数kdと比較する。比較の結果
、上記(4)式のように次数deg[F’(x)]がk
dより小であれば、「誤りなし」と判定し、F’(x)
をそのままF(x)とする。上記比較の結果、次数de
g[F’ (x)]がkd以上である場合、「誤りあり
」と判定され、F’(x)を受ける誤り訂正手段3の出
力を、求めるF (x)とする。
When the decoding device receives the code V', the arithmetic means l calculates
Find F'(x) and degree deg[F'(x)]. The obtained order deg[F'(X month) is compared with a predetermined number kd by the comparing means 2.As a result of the comparison, the order deg[F'(x)] is k
If it is smaller than d, it is determined that there is no error, and F'(x)
Let be F(x) as it is. As a result of the above comparison, the order de
If g[F'(x)] is greater than or equal to kd, it is determined that there is an error, and the output of the error correction means 3 that receives F'(x) is set as the sought F(x).

つぎに、誤り訂正手段3の動作を、第2図のブロック図
を参照して説明する。
Next, the operation of the error correction means 3 will be explained with reference to the block diagram of FIG.

初期状態として、iJとして、メモリ5には、ro(x
)−F’ (x)およびr−、(x)−M(x)を保持
し、メモリ7には、s、(x)=1およびs−、(x)
−0を保持しておく。
In the initial state, iJ stores ro(x
)-F' (x) and r-, (x)-M(x), and the memory 7 stores s, (x)=1 and s-, (x)
Keep it at -0.

そこで、演算回路4は、上記(5)式を満足するqI(
X) 、 r+(x)およびdeg[r+ (x)]を
求める。演算回路6は、求められたqI(x)に応じて
上記(6)式に従い、s、(x)を求める。比較回路8
は、 deg[r+(x)l と (n−t)dとを比
較し、deg[r+(x月≧ (n−t)d のとき、i*i+1とし、上記処理を繰返す。
Therefore, the arithmetic circuit 4 calculates qI(
X), r+(x) and deg[r+(x)]. The arithmetic circuit 6 calculates s and (x) according to the above equation (6) according to the calculated qI(x). Comparison circuit 8
compares deg[r+(x)l and (nt)d, and when deg[r+(x month≧(nt)d), i*i+1 is set, and the above process is repeated.

d+4[r+(x)]  ((n−t)dのときは、演
算回路9が、上記(7)式に従いその時点の r、(x
)およびs、(x)に応じて、F(x)= r+(x)
 / 51(X)を求める。
d+4[r+(x)] ((n-t) When d, the arithmetic circuit 9 calculates r, (x
) and s, (x), F(x) = r+(x)
/ Find 51(X).

次に具体的な例を挙げて説明する。Next, a specific example will be given and explained.

原始元α(α3◆α+1−0)なる有限体GF(2’)
の元からなるn=8.km4.t−2,dwlの符号を
考える。
Finite field GF (2') of primitive element α (α3◆α+1-0)
consisting of elements n=8. km4. Consider the sign of t-2, dwl.

情報記号列F(x)を F(x)−a ’ x’+ a ’x” + a ”x
+ aとすると、 V*(a、cx’、1.ex”、a’、a’、a’、1
1である。いま、2個の誤りの生じた符号V′を、V′
・(α、α5.α6.α3.α4.α4.α3.1)と
すると、 F’(x)−x’+  a 6x6+ax’+  a’
x’+a”x”+α6x2+α2x+α である。deg[F’(x)]= 7 > kd −4
であるから、ユークリッドの互除法を用いた繰返し演算
を行なうと、 ■ r−、(x)−M(x)mx’+x 、 ro(x
)−F’(x)。
The information symbol string F(x) is F(x)-a 'x'+ a 'x' + a 'x
+ a, V*(a, cx', 1.ex", a', a', a', 1
It is 1. Now, let the two erroneous codes V′ be V′
・If (α, α5.α6.α3.α4.α4.α3.1), then F'(x)-x'+ a 6x6+ax'+ a'
x'+a"x"+α6x2+α2x+α. deg[F'(x)] = 7 > kd -4
Therefore, if we perform an iterative operation using Euclid's algorithm, ■ r-, (x)-M(x)mx'+x, ro(x
)−F′(x).

s−+(x)−0、5o(x)−+l 。s-+(x)-0, 5o(x)-+l.

iJl ■ r−+(x)=q+(に)rO(x)+「I(x)
より、qI(に)冨X◆α6 r、(x)菖a ’X’+α’X’+α’X’+(! 
’X″+α’x” +x +1 ■ st(x)−S−1cx) −qI(x)so(x
)= qI(に) 謬X+α6 ■ 1)  deg[r+(x)] ” 6≧ (n−
t)d −[i 。
iJl ■ r−+(x)=q+(ni)rO(x)+“I(x)
From, qI (to) TomiX◆α6 r, (x) irises a 'X'+α'X'+α'X'+(!
'X''+α'x'' +x +1 ■ st(x)-S-1cx) -qI(x)so(x
)= qI(ni) False X+α6 ■ 1) deg[r+(x)] ” 6≧ (n-
t) d − [i.

■ ro(X)=42(X)I’+ (X)+r2(x
)より、q2(X)ツαX rg(x)=α5x8+α2 x 4◆α x3+α5
 x 2+α4 x+α■  52(X)−5o(x)
−42(X)sl(X)=αx2◆  x+  1 ■  2)    deg[rg(x)]   −5<
  (n−t)d  −6。
■ ro(X)=42(X)I'+(X)+r2(x
), q2(X) αX rg(x)=α5x8+α2 x 4◆α x3+α5
x 2+α4 x+α■ 52(X)-5o(x)
−42(X)sl(X)=αx2◆ x+ 1 ■ 2) deg[rg(x)] −5<
(nt)d-6.

F(x)−rz(x)/5z(x) x  cc ’  X’+  α’x”+α2x+  
αとなり、情報記号列F(x)が求まる。
F(x)-rz(x)/5z(x) x cc 'X'+ α'x"+α2x+
α, and the information symbol string F(x) is found.

[発明の効果] 以上説明したように、本発明によれば、有限体GF(2
m)上の多項式を用いて定義されるストーン符号におい
て、 n−に≧2t を満たすt個までの誤りが生じた場合に、比較的少ない
演算量により、誤りを訂正することかできる。
[Effect of the invention] As explained above, according to the present invention, the finite field GF (2
m) In the Stone code defined using the above polynomial, when up to t errors satisfying n-≧2t occur, the errors can be corrected with a relatively small amount of calculation.

また、この符号法において、d=1とした場合は、リー
ド・ソロモン符号と呼ばれる符号となり、上記(2)式
で示されるL+(X)は、t+(x)=1  (i−1
,2,・・・、n)となって、さらに容易に復号な行う
ことがてきる。
In addition, in this coding method, if d=1, the code becomes a Reed-Solomon code, and L+(X) shown in equation (2) above is t+(x)=1 (i-1
, 2, . . . , n), which makes decoding even easier.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係る誤り訂正回路の構成を示すブロッ
ク図、第2図は第1図の誤り訂正手段の一例のブロック
図である。
FIG. 1 is a block diagram showing the configuration of an error correction circuit according to the present invention, and FIG. 2 is a block diagram of an example of the error correction means of FIG. 1.

Claims (1)

【特許請求の範囲】 中国人の剰余定理に基いた剰余多項式符号を用いた誤り
訂正回路において、 有限体GF(2^m)(mは1以上の整数)上での加算
、乗算および除算を行う演算手段と、 多項式の次数を求めて、予め定めた定数との大小関係を
判断する比較手段と、 最大公約数を求めるユークリッドの互除法の繰返し演算
を行う誤り訂正手段とを備え、 エラー位置およびエラー値を求めることなく復号をおこ
なうことを特徴とする誤り訂正回路。
[Claims] In an error correction circuit using a remainder polynomial code based on the Chinese remainder theorem, addition, multiplication, and division on a finite field GF(2^m) (m is an integer of 1 or more) are performed. a computation means for determining the degree of the polynomial and a comparison means for determining the magnitude relationship with a predetermined constant; and an error correction means for performing repeated computation of Euclidean's mutual division method for determining the greatest common divisor. and an error correction circuit characterized in that decoding is performed without determining an error value.
JP25924787A 1987-10-14 1987-10-14 Error correcting circuit Pending JPH01101742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25924787A JPH01101742A (en) 1987-10-14 1987-10-14 Error correcting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25924787A JPH01101742A (en) 1987-10-14 1987-10-14 Error correcting circuit

Publications (1)

Publication Number Publication Date
JPH01101742A true JPH01101742A (en) 1989-04-19

Family

ID=17331451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25924787A Pending JPH01101742A (en) 1987-10-14 1987-10-14 Error correcting circuit

Country Status (1)

Country Link
JP (1) JPH01101742A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5436916A (en) * 1993-02-12 1995-07-25 Nec Corporation Error correction by detection of a degree difference between dividend and divisor polynomials used in Euclidean algorithm

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60248044A (en) * 1984-05-23 1985-12-07 Mitsubishi Electric Corp Data transmitting method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60248044A (en) * 1984-05-23 1985-12-07 Mitsubishi Electric Corp Data transmitting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5436916A (en) * 1993-02-12 1995-07-25 Nec Corporation Error correction by detection of a degree difference between dividend and divisor polynomials used in Euclidean algorithm

Similar Documents

Publication Publication Date Title
US6347389B1 (en) Pipelined high speed reed-solomon error/erasure decoder
US6631172B1 (en) Efficient list decoding of Reed-Solomon codes for message recovery in the presence of high noise levels
Saints et al. Algebraic-geometric codes and multidimensional cyclic codes: a unified theory and algorithms for decoding using Grobner bases
Truong et al. Fast algorithm for computing the roots of error locator polynomials up to degree 11 in Reed-Solomon decoders
US6219817B1 (en) Error correction and detection for faults on time multiplexed data lines
EP0836285B1 (en) Reed-Solomon decoder with general-purpose processing unit and dedicated circuits
US7100103B2 (en) Efficient method for fast decoding of BCH binary codes
JPH01101742A (en) Error correcting circuit
JP3245290B2 (en) Decoding method and device
KR102401902B1 (en) Lossy arithmetic
JP3248098B2 (en) Syndrome calculation device
Fedorenko Efficient algorithm for finding roots of error-locator polynomials
Fedorenko The discrete Fourier transform over a finite field with reduced multiplicative complexity
US6233710B1 (en) Reed-Solomon decoding device
US6859905B2 (en) Parallel processing Reed-Solomon encoding circuit and method
Han et al. On fast Fourier transform-based decoding of Reed-Solomon codes
US8499224B2 (en) Redundant code generation method and device, data restoration method and device, and raid storage device
Leducq On the Covering Radius of First-Order Generalized Reed–Muller Codes
US20030009723A1 (en) Simplified reed-solomon decoding circuit and method of decoding reed-solomon codes
Loidreau Codes derived from binary Goppa codes
US7287207B2 (en) Method and apparatus for computing parity characters for a codeword of a cyclic code
JP2600683B2 (en) Decoding method of Reed-Solomon code
Bhandari et al. Algorithmizing the Multiplicity Schwartz-Zippel Lemma
JP2600681B2 (en) Decoding method of Reed-Solomon code
Stevens et al. Decoding binary two-error correcting cyclic codes with Zech logarithms