【摘要】 研究正交频分复用(OFDM)系统中各子载波之间频域的相关性,并将其应用在子载波簇的划分上。根据相干带宽的概念,提出用相干载波数划分簇的大小以及用簇内各子载波的平均信道信息代表整个簇的信道状况。在Matlab环境下搭建仿真平台,模拟OFDM系统在多径信道上频域各子载波之间的相关性。仿真结果表明,当簇的大小为相干载波数时,不但可以减小上行反馈开销,而且不会带来系统吞吐量的明显损失。更多还原

【Abstract】 The correlation among the Orthogonal Frequency Division Multiplexing(OFDM) subcarriers in the frequency domain is studied,and is used for subcarriers grouping.The number of coherent subcarriers is calculated according to the concept of coherent bandwidth,and is used to divide the subcarriers into groups.Average channel information within a group is proposed to represent the whole group.A simulation platform is established in Matlab to simulate the correlation among OFDM subcarriers in frequency domain.Simulation results show that it can greatly reduce the uplink feedback overhead,and do not result in the loss of system throughput performance when the group size is equal to the number of coherent subcarriers.更多还原