基于分组密码的跳频序列多址接入性能分析

基于3DES迭代型分组密码产生的跳频序列,构造了一种跳频组网的随机多址接入方案模型。在此基础上分析了跳频码分多址的系统接入性能,从理论上推导出跳频图案碰撞引起的误分组率、跳频组网的吞吐量和归一化吞吐率,证明数据分组长度M与可用频隙数q的比值是决定跳频码分多址系统性能的重要因素。计算机仿真结果验证了理论的正确性,同时也证明了基于分组密码的跳频序列具有较好的跳频多址组网性能。

Analysis of multi-access performance on block cipher based FH sequences

Based on the 3DES block cipher frequency-hopping (FH) sequences, the paper suggests a kind of packet protocol for frequency-hopping multiple-access (FHMA) networks. In theory, the performance of the packet error and the throughput of FHMA network are derived, which shows that the ratio of the packet length M to the frequency-hopping slots q is the most key parameter to determine the FHMA system performance under the condition of large user number. Computer simulation results of block cipher based FH sequences compared with those of the logistic chaotic sequences are also included to support our development.