在长期演进(LTE)上行随机接入中，接收端对前导的检测是一个很重要的步骤。由于前导序列较长，传统的接收端算法运算量较大。为了减小接收端算法的运算量，引入降采样，对传统的 接收端算法进行改进。改进后的接收端算法运算量大大减少。以格式0为例，在一个计算周期内，改进后的算法运算量是改进前运算量的1/120。 MATLAB仿真结果表明，改进前后的接收端算法在检测 性能上差别较小。在不同的信道环境下，经过改进后的算法仍然具有较好的检测性能。

In long term evolution (LTE) uplink random access, preamble detection is an important step. Because preamble sequence is long, the traditional receiver algorithms have a larger computation burden. Downsampling was introduced to reduce the computation burden. Several improvements were made to the traditional receiver algorithms. The computation burden of receiver algorithm after improvement decreases greatly in comparison with the algorithm before improvement. Take format 0 for example, the computation burden of algorithm before improvement is 120 times as much as the algorithm after improvement in an operation cycle. Simulation results show that the detection performance of algorithm after and before improvement almost don’t make any difference. The algorithm after improvement shows good performance in various wireless channels.