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从理论上分析了采用速率自适应策略的OFDM(AOFDM)传输模型在频率选择性信道下性能表现;并给出频谱效率及平均误码率的理论公式。结果表明,采用自适应调制能够在保证达到目标误码率的前提下提高频谱效率,提高的幅度与所选择的调制等级数以及子载波数有关。这对系统设计很有帮助。
The performance of OFDM (AOFDM) transmission model using rate adaptation strategy under frequency selective channel is theoretically analyzed. The theoretical formula of spectral efficiency and average bit error rate is given. The results show that using adaptive modulation can improve the spectral efficiency under the premise of achieving the target BER, which is related to the number of modulation levels and the number of subcarriers selected. This is very helpful for system design.