According to the characteristics of fh - ocdma system , an upper bound on the size of spread spectrum codes with good performance in autocorrelation and cross - correlation is deduced . then , the quadratic congruence - hop codes that achieve this bound are presented in conformity to the quadratic congruence codes 從fh - ocdma系統的擴頻特征出發,推導出具有良好相關性能的擴頻碼所能達到的最大碼容量,并以二次全等碼的構造方法為基礎,提出了具有良好相關性能和最大碼容量的二次全等跳頻碼的構造方法。