跳码多址接入及其图案设计

由码分多址中用户地址码随时间跳变形成的跳码多址接入技术中，通过伪随机生成的跳码图案而非唯一地址码区分多用户，可以有效地提高用户接入数量。然而，现有的跳码图案设计方案接入碰撞概率较高，造成了严重的系统内干扰，降低了误码性能和编码效率。对此，提出了一种低碰撞概率的跳码图案设计方案，并与地址码随机移位技术相结合。仿真结果表明，在接入用户数量大于地址码数量的前提下，所提方案相比现有方案可获得误码性能增益。

Code-Hopping Multiple Access and Its Pattern Design

The hopping communication technology based on code divide multiple access, namely code-hopping multiple access, with pseudo-randomly constructed code-hopping pattern to detect multi-users, is regarded as an effective method to increase the user capacity. However, the significant access collision rate causes internal interference, seriously degrading the bit error performance and coding efficiency. To address the issue, a code hopping pattern with cyclic shifted address code scheme is proposed to reduce the access collision probability. The simulation results show that the proposed scheme can achieve better bit error performance than the hopping pattern based on the pseudo-random type.