  To reduce peak-to-average power ratio, we propose a method to choose a
suitable vector for a partial transmit sequence technique. With a conventional
method for this technique, we have to choose a suitable vector from a large
amount of candidates. By contrast, our method does not include such a selecting
procedure, and consists of generating random vectors from the Gaussian
distribution whose covariance matrix is a solution of a relaxed problem. The
suitable vector is chosen from the random vectors. This yields lower
peak-to-average power ratio, compared to a conventional method for the fixed
number of random vectors.
