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在Raleigh信道下对自适应调制结合空频分组码的OFDM方案进行性能分析。针对多径传播引起的快衰落问题,在简化为广义稳态非相关散射多径信道的基础上给出改进的Raleigh信道模型,并提出了一种基于信道状态信息的自适应SFBC-OFDM方案,该方法运用了Chow自适应比特分配算法及Alamouti分集算法,并给出自适应OFDM方案与之比较。仿真结果表明,在有信道信息延时的两种条件下增益分别高出了1.3～14dB和3～17.5dB。系统显示出较好的对抗多径影响的性能。
Performance analysis of adaptive modulation combined with space-frequency block code OFDM scheme in Raleigh channel. Aiming at the problem of fast fading caused by multipath propagation, an improved Raleigh channel model is proposed based on the simplification of generalized steady-state non-correlated scattering multipath channel. An adaptive SFBC-OFDM scheme based on channel state information is proposed. This method uses the Chow adaptive bit allocation algorithm and the Alamouti diversity algorithm, and gives an adaptive OFDM scheme with which. The simulation results show that the gain is 1.3 ~ 14dB and 3 ~ 17.5dB respectively under the two conditions with channel information delay. The system shows better performance against multipath effects.