摘要
在频率选择性衰落环境中,MIMO-OFDM系统能够极大地提高无线通信系统的容量和可靠性。发射/接收天线选择方法能以很小的性能损失换取射频成本的大幅度降低,使系统不完全受射频成本的限制。容量性能是天线选择当中的重要准则。现提出一种基于子系统的接收天线选择方法,降低了多载波系统的复杂度。仿真结果表明,系统的容量性能与传统方法相当,在接收信噪比为20dB、发射端采用两根接收天线的时候,12选2比无选择的情况得到近1.2比特/信道的容量增量,并且容量增益随着天线的增加而增加。
Multiple input multiple output-orthogonal frequency division multiplexing systems can greatly improve the capacity and reliability of wireless communication in frequency selective fading environments.The transmission/receiving antenna selection method can substantially reduce the RF cost with a little system performance loss,thus eliminate the limit of RF cost to MIMO-OFDM system.Capacity performance is important in antenna selection.A novel antenna selection algorithm based on sub-system is proposed which decreases the computational complexity in multi-carrier system.Simulation results indicate that the capacity performance is roughly same to the traditional method＇s.When the SNR is 20dB and transmitter uses two antennas,the performance of two antennas selected from 12 antennas gains 1.5b/s/Hz than that of no selection case.The capacity gain increases with the antenna quantity.
出处
《信息技术》
2010年第9期114-117,共4页
Information Technology
