J4 ›› 2012, Vol. 29 ›› Issue (5): 637-643.

• Optical Communication • Previous Articles     Next Articles

Research on uplink random access receiver algorithm in LTE

XU Meng1,2, YAN Feng-ping1,2   

  1. 1 Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC，Beijing Jiaotong University，Beijing 100044，China;
    2 Institute of Lightwave Technology，Beijing Jiaotong University，Beijing 100044, China
  • Received:2011-09-27 Revised:2011-10-19 Published:2012-09-28 Online:2012-09-02

Abstract:

In LTE（Long Term Evolution） uplink random access, preamble detection is an important step. Because preamble sequence is long, the traditional receiver algorithms have a larger computation burden. In order to reduce the computation burden, downsampling was introduced. 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 improvement and before improvement almost don’t make any difference. The algorithm after improvement shows good performance in various wireless channels.

Key words: optical communication, receiver algorithm in random access, downsampling, preamble detection, false alarm probability, miss error probability

CLC Number: 

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