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矿井巷道无线传输系统中基站检测用户信息的准确度对井下安全监测和安全作业至关重要,为此提出上行链路多载波码分多址(MC-CDMA)多用户检测方案来改善信息传输的可靠性.矿井巷道MC-CDMA系统中当多个用户同时向基站发送信息时,用户不同符号在不同子载波上经历相互独立的衰落,破坏了用户间扩频码的正交性,引起多址干扰.针对矿井巷道带状结构的特点,提出了一种矿井巷道MC-CDMA粒子群多用户检测(PSO-MUD)算法.PSO-MUD将常规的正交恢复合并检测(ORC)或解相关多用户检测(D-MUD)的输出作为第一次迭代第一个粒子的输入,通过迭代更新每个粒子位置,从而找到使目标函数取得最大值时对应的最佳粒子的位置作为检测结果.结果表明:相比于MC-CDMA常规ORC和D-MUD,采用所提出的MC-CDMA粒子群多用户检测显著地改善了矿井巷道MC-CDMA系统的无线传输性能,检测效果接近于最佳多用户检测.同时,相比于最佳多用户检测(O-MUD)所提出的粒子群多用户检测算法具有收敛速度快、复杂度低的特点,有利于矿井巷道MC-CDMA高效、实时的无线传输.
The accuracy of base station detecting user information in mine tunnel wireless transmission system is crucial for mine safety monitoring and safety work. Therefore, multi-carrier code division multiple access (MC-CDMA) multi-user detection scheme is proposed to improve the information transmission Reliability In the mine tunnel MC-CDMA system, when multiple users transmit information to the base station at the same time, the different symbols of the users experience independent fading on different subcarriers, destroying the orthogonality of the spreading codes between users and causing multiple access Interference.Aiming at the characteristics of belt structure in mine roadway, a multi-user detection (PSO-MUD) algorithm for mine roadway MC-CDMA particle swarm is proposed.PSO-MUD combines conventional ORC (ORC) The output of user detection (D-MUD) is used as the input of the first particle in the first iteration, and each particle position is iteratively updated to find the position of the best particle corresponding to the maximum of the objective function. Compared with MC-CDMA conventional ORC and D-MUD, the proposed MC-CDMA particle swarm multi-user detection significantly improves the wireless transmission performance of mine roadway MC-CDMA system, and the detection effect is close to the best User detection.Meanwhile, compared with the best multi-user detection (O-MUD) proposed particle swarm multi-user detection algorithm has the characteristics of fast convergence, low complexity, is conducive to mine roadway MC-CDMA efficient, real-time wireless transmission.