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引用次数: 8
摘要
与以往的移动通信系统类似，第五代移动通信(5G)中的RA (random access)过程是基于对PRACH (Physical random access Channel)前导的检测，实现用户设备(UE)与下一代Node B (gNB)之间的上行同步。提出了一种5G基站(gNB)中PRACH前导信号的检测方法。该方法采用一种增强的多步检测算法，有效地抑制了由噪声和信道条件引起的多径衰落、多普勒频移、频率偏移和时序偏移等虚警峰。仿真结果表明，在一定信噪比水平和传播条件下，优化检测阈值的方法满足系统对检测概率和虚警概率的要求。
A proposed preamble detection algorithm for 5G-PRACH
Similar to previous mobile communication systems, random access (RA) procedure in fifth generation of mobile communication (5G) is used to achieve the uplink synchronization between user equipment (UE) and next generation Node B (gNB) based on the detection of preambles in Physical Random Access Channel (PRACH). A method for detecting preamble in PRACH at 5G base station (gNB) is proposed in this paper. The proposed method uses an enhanced algorithm with multi-detection steps to reject effectively false alarm peaks due to noise and channel condition as multipath fading, Doppler shift, frequency offset and timing offset. Simulation results show that the proposed method with optimized detection thresholds satisfies the requirements of system about detection probability and false alarm probability under a certain SNR level and propagation condition.
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