OFDM频域子信道FSMM

首先分析了正交频分复用技术(OFDM)频域信道统计特性，说明了Nakagami-m分布能更好地描述衰落信道；然后针对高速移动及OFDM信号传输的特点，采用状态持续时间相等法建立了OFDM频域信道有限状态马尔可夫模型（FSMM），分别给出了计算持续时间、状态门限及状态数、转移概率、状态差错率的一般方法及m=0.5\1\2典型值的闭式解，该模型能为自适应模型控制（AMC）、混合自动重传请求(HARQ) HARQ、动态资源分配等技术提供良好的基础。 理论计算结果与仿真符合较好，验证了模型的准确性。

Finite-State Markov Model for Frequency Domain Subchannel of OFDM

The statistical characteristic of orthogonal frequency division multiplexing(OFDM) frequency domain channel is analyzed at first. Aiming at the peculiarity of high-speed mobile and transmitting of OFDM signal, a finite-state Markov channel model (FSMM)is formed to represent OFDM frequency domain channel which is modeled as Nakagami-m fading distribution random process that is used in modeling mobile channel more and more widely. The methodology is developed and analyzed to partition the received signal-to-noise ratio into a finite number of states according to the same duration of each state. The method of computing the duration, the threshold , the number of states and the transition probability as well as the average error probability of state is given and the close solution when m is equal to 0.5 or 1 or 2.This model can provide the good base of adaptive modulation and coding and automatic repeat request as well as dynamic resource allocation. The computation results is according to computer simulation results, which verify the accuracy of the model.