| 摘要: |
| 在长期演进(LTE)系统中，发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道(PBCH)中，终端在解读PBCH信道获取主信息块(MIB)的同时，需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射天线数进行PBCH译码，直至正确译码为止，译码复杂度非常高。基于此，提出一种改进的天线端口数估计算法，提取各天线端口传输的小区参考信号序列做相关，通过相关值与相关系数门限值的比较直接快速获取基站的实际天线端口数。仿真结果表明：该算法相较于传统检测算法和功率检测算法在时间复杂度上分别提升了4个数量级和3倍；在信噪比高于0 dB时，所提检测算法较功率检测算法有4~6 dB的增益。 |
| 关键词: LTE系统 天线端口数检测 物理广播信道 参考信号 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61301126）;重庆市基础与前沿研究计划项目（cstc2013jcyjA40032）;重庆邮电大学博士启动基金项目（A2012-33）;重庆邮电大学青年科学研究项目（A2013-31） |
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| An improved antenna port number detection algorithm for LTE system |
| JIANG Qing,WEI Shan |
| () |
| Abstract: |
| In the long term evolution(LTE) system，the number of antenna ports is implied in physical broadcast channel(PBCH) by cyclic redundancy check mask(CRC mask). When the terminal obtains master information block(MIB)，it also needs to correctly detect the number of transmit antenna ports that PBCH uses. But original detection method tries to decode PBCH respectively with 1，2 or 4 antennas until decoding correctly，which has high complexity. So an improved algorithm for antenna port number detection is proposed which extracts the cell reference signal(CRS) in different antenna ports to perform correlation calculation and then get the actual antenna port number of base station by comparing the correlation value with the relevant threshold.Simulation results show that this method，on the time complexity,raises four orders of magnitude and three times respectively compared with the traditional detection algorithm and the power detection algorithm,and has 4~6 dB gain when compared with the power detection algorithm at 0 dB signal-to-noise ratio(SNR) above. |
| Key words: LTE system antenna port number detection physical broadcast channel(PBCH) reference signal |
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