Signal Design for Good Correlation: For Wireless Communication, Cryptography, and Radar

Exercises for Chapter 3

  1. Give a proof for Corollary 3.3 in Section 3.2. In other words, prove that in any finite field of characteristic p,


    for any m ? 1.

  2. Let GF(2 6) be defined by the primitive polynomial f( x) = x 6 + x + 1 and let ? be a root of f( x). Compute: ? 9 + ? 23, ? 9 ? 23, and 1 + ? 7.

  3. Let p be a prime number. Prove that


  4. The cyclotomic coset containing s consists of


    where n s is the smallest positive integer such that (mod p n 1). Prove that n s n.

  5. Let ? be a primitive element in GF( p n). Prove that m s( x) defined in the algorithm in Section 3.4 is a polynomial over GF( p). In other words, if


    where C s is the cyclotomic coset modulo p n 1 containing s as the coset leader, then the coefficients of m s( x) belong to GF( p).

  6. Let GF(2 5) be defined by the primitive polynomial f( x) = x 5 + x 3 + 1 and let ? be a root of f( x).

    1. Compute...

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