Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (5): 45-50.doi: 10.3969/j.issn.1000-565X.2015.05.008

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Design of Cyclic Delay Diversity Receiving Scheme in LTE Uplink System

Han Wei-liang1 Ge Jian-hua1 Bu Qi-fei1 Shi Xiao-ye2 Ji Yan-cheng3   

  1. 1． State Key Laboratory of Integrated Service Networks，Xidian University，Xi'an 710071，Shaanxi，China;2． School of Internet of Things，Nanjing University of Posts and Telecommunications，Nanjing 210003，Jiangsu，China;3． School of Electronics and Information，Nantong University，Nantong 226019，Jiangsu，China
  • Received:2014-11-17 Revised:2015-01-12 Online:2015-05-25 Published:2015-05-07
  • Contact: 韩伟良(1984-)，男，博士生，主要从事 MIMO-OFDM 研究． E-mail:hanweiliang1205@126.com
  • About author:韩伟良(1984-)，男，博士生，主要从事 MIMO-OFDM 研究．
  • Supported by:
    Supported by the National High-Tech Ｒ＆D Program of China(2014AA01A704)，the National Program on Key Basic Research Project of China(2012CB316100)，the Programme of Introducing Talents of Discipline to Universities(B08038) and the National Natural Science Foundation of China(61372067，61371112，61371113，61401241)

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Abstract: For the lack of transmitting antenna in long-term evolution (LTE) uplink system，base stations cannot obtain a good diversity gain and system performance． In order to solve this problem，a novel scheme using cyclic delay combining technique at the receiver is proposed to achieve full spatial-multipath diversity． In this scheme，cyclic delayed copy signals at different receiving antennas are combined． Then，the minimum mean square error equalization in frequency domain is made and the signal is detected symbol by symbol． When an appropriate cyclic delay shift is chosen，the system can obtain a maximum spatial-multipath diversity gain with low demodulation com-plexity． Simulated results indicate that，in comparison with the existing antenna selection schemes in LTE uplink system，the proposed scheme helps acquire the same diversity gain and a higher coding gain without additional de-modulation complexity; and that，when outage probability reaches 10-3，the proposed scheme leads to 2 ～4dB of gain under Rayleigh channel and at least 1. 5dB of gain under extended pedestrian channel．

Key words: long-term evolution system, cyclic delay, multiple input multiple output system, spatial-multipath diversity, single-carrier frequency domain equalization