A Space-Time-Frequency Spreading CDMA Scheme for the UAVs Downlink

摘要：

We have designed a space-time-frequency spreading code-division multipleaccess (STFS-CDMA) framework for the Umanned Aerial Vehicles(UAVs) downlink orthogonal frequency-division multiplexing (OFDM) system employing multiple transmit and receive antennas(MIMO).Firstly,we analyse the UAVs downlink multi-user structure and corresponding the linear minimum mean-square error(MMSE) detection algorithm.Secondly, we present the spreading code design criterias of maximal sapce-time-frequency diversity gains and equal multipleaccess interferences over users,and conclude the spreading code design structure according to the signal-to-interference-noise ratio(SINR) of MMSE detector in conformity to the above design criterias,we find that the fraction codes corresponding the static child channels except for the different users are orthogonal. Not only affording the form of multi-access but also achieving the maximal diversity gains,the spreading code is optimized to match the sapce-time-frequency features of MIMO- OFDM systems.

关键词： sapce-time-frequenc MMSE UAV

作者: HU Yong-Jiang LI Xiao-Min CHEN Zi-Li

作者单位: Department of Optics and Electrics Engineering,Ordnance Engineering College,China

会议类型: 国际会议

会议名称: 第八届国际测试技术研讨会(8th International Symposium on Test and Measurement)

会议地点: 重庆

会议语种:英文

页码: 1742-1745

在线出版日期: 2009-08-01（万方平台首次上网日期，不代表论文的发表时间）