提出一种基于线性同余生成器(LCG)来构造IDMA系统中随机交织器的方法.该方法通过选择LCG的参数使其周期达到最大.为了设计方便,取LCG的模为2的整数幂.利用文中的方法产生母交织器,再对其进行循环移位,即得到每个用户的交织器.其中超出交织范围的随机数将被丢弃.数学推导证明,在上述条件下LCG的模必须严格大于交织器的深度.利用基向量相关峰值方法和误比特率性能证明了文中方法的有效性. A method of constructing random interleaver in IDMA system based on linear congruential generator (LCG) is proposed, which maximizes the cycle by selecting the parameters of LCG.For convenience of design, the modulus of LCG is taken as an integer power of two. We use the method to generate the mother interleaver, and then cyclically shift it to obtain the interleaver for each user, in which the random number beyond the interleaving range will be discarded.Mathematical derivation proves that the LCG modulus must be strict under the above conditions Which is larger than the depth of the interleaver.The effectiveness of the proposed method is proved by using the peak vector correlation method and bit error rate performance.