New near-optimal frequency-Hopping sequences of length pq

In this paper we construct near-optimal frequency-hopping sequences whose maximum Hamming autocorrelation is given by lambda_opt+1 where lambda_opt is the optimal Hamming autocorrelation value with respect to the Lempel-Greenberger bound. Their period, frequency set size, and maximum Hamming autocorrelation are given as pq, m and pq-1/m+1, respectively, where p and q are distinct odd primes, and m is an even common divisor of p-1 and q-1.