电子器件Issue(1)：41-45,5.DOI:10.3969/j.issn.1005-9490.2016.01.009
快时变多用户MIMO-OFDM系统中复杂度可调的子载波分组预编码技术
Grouped-Subcarrier Precoder with Adjustable Complexity for Multi-User MIMO-OFDM Systems in Time-Variant Wireless Channels
摘要
Abstract
In multi-user time-variant MIMO-OFDM system,the global beamformer of precoding all subchannels to⁃gether performs far better than the one of precoding each subcarrier individually. However,the complexity of the for⁃mer becomes prohibitive as the product of the number of transmit antennas at base-station and the total number of subcarriers increases up to or more than one thousand. To solve this problem,a grouped-subcarrier maximum signal-to-leakage-and-noise ratio(GS-Max-SLNR)precoder with adjustable complexity is proposed. Using theoretical mod⁃eling and simulations it is found that the proposed GS-Max-SLNR precoder can strike a good balance between com⁃plexity and performance by choosing a proper value of group number. It is noted that the idea of grouping can be easily extended to other classic precoders like block diagonalization,and minimum mean square error. Additionally,we also derive a simple formula for inter-group interference to help choose the proper number of groups given Doppler spread and signal-to-noise ratio.关键词
多输入多输出/正交频分复用/最大化信泄噪比/子载波分组/线性预编码Key words
MIMO/OFDM/Max-SLNR/grouped-subcarrier/linear precoder分类
信息技术与安全科学引用本文复制引用
童娟娟,束锋,李隽,李蠡,王忆蒙,桂林卿,陆锦辉..快时变多用户MIMO-OFDM系统中复杂度可调的子载波分组预编码技术[J].电子器件,2016,(1):41-45,5.基金项目
国家自然科学基金项目（61271230，61472190）；中央高校基本科研业务费专项资金项目（30920130122004）；东南大学移动通信国家重点实验室开放课题项目 （）
