Abstract: This paper proposes a method for adaptive bit loading under the imperfect CSI gotten by the channel estimation based on the comb-pilots insertion. The subcarriers are divided into a few groups and then CSI based on the channel estimations are got by comb-pilots to track the time-varying channel. It implements the bit loading algorithm. Sub-channel allocation and bit loading are performed to decrease the computation. The simulation results show that this algorithm can save more than 10 dB compared with the equal bit allocation algorithm of static sub-channel allocation methods.

Key words: Orthogonal Frequency Division Multiplexing(OFDM), Margin Adaptive(MA), comb-pilots, adaptive allocation

摘要： 提出一种根据梳状导频进行信道估计得到带有误差的信道信息，来完成自适应比特装载的算法。把正交频分复用子载波进行分组，利用基于梳状导频的信道估计对信道时变进行跟踪，即时获取信道信息来完成分配算法。将子信道的分配和子信道上的比特、功率分配分离开来，以降低计算复杂度。仿真结果表明与静态信道分配方案的等比特分配算法相比，该算法可以节约发送功率大于10 dB。

关键词: 正交频分复用, 边值自适应, 梳状导频, 自适应分配

CLC Number: 

• TN915.02