中文摘要：

当信道变化较慢时,无法利用无线信道的时变冗余特性实现密钥协商。针对上述问题,给出了一种基于网格编码调制（TCM）的慢衰落信道密钥协商方法。对随机生成的密钥序列进行TCM编码得到带有冗余的密钥信息,并利用两端的保密序列分别对密钥信息进行隐藏与恢复,同时利用密钥信息中的冗余纠正两端的保密序列不一致引起的恢复误差,最终获得一致的密钥序列。仿真结果表明,在比特率为10^-4时,该方法比现有方法有将近5 d B的增益。

英文摘要：

The characteristic of variable redundancy of wireless channel can＇ t be used in existing key agreement schemes when the channel vibrates slowly. To overcome the above limitations, this paper proposed a slow fading channel key agreement scheme based on trellis coded modulation （TCM）. The random key sequence was encoded by TCM to generate key information with redundancy, which was further hidden and restored by the secret sequence. It used the redundancy of the key information to correct the recovery error caused by the inconsistent secret sequence. Finally, the legitimate users could obtain the consistent keys sequence. Simulation results show that, the proposed scheme provides a 5 dB gain compared with state-of-the-art methods when the bit rate is 10^-4.