超高速场景下随机接入前导序列的检测

Detection of random access preamble sequences in ultra high speed mobile environment

针对通信系统中用户设备(user equipment,UE)在超高速移动场景下产生的大多普勒频偏问题,提出了一种利用新限制集方法生成随机接入前导序列的检测算法。该方法根据新限制集频率偏移导致功率弥散的特点,采用5个检测窗口对随机接入前导序列进行联合检测。首先,找到5个候选窗口中每个窗口峰值功率的最大值并记录位置;然后,将5个候选检测窗口的峰值功率最大值进行叠加作为前导序列检测峰值功率。仿真结果表明,所提方法可以有效地规避大多普勒频偏对随机接入前导序列检测带来的影响。

To solve the problem of large Doppler frequency offset generated by user equipment（UE）in the ultra high speed mobile communication systems,this paper proposes a new detection algorithm based on a new restricted set method to generate random access preamble sequences.According to the characteristics of power dispersion caused by the new frequency offset,the proposed method uses five detection windows to jointly detect the random access preamble sequences.First,the maximum peak power of each window in the five candidate windows is found and recorded.Then,the peak power of the five candidate detection windows is superposed as the preamble to detect the peak power.The simulation results show that the method can effectively affect the detection of random access preamble with large Doppler shift.