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为了设计信道纠错能力强、系统频带利用率高的无线链路自适应传输技术,文中研究了基于LDPC信道纠错码的自适应编码调制OFDM系统模型以及相应的传输方案,并设计了四区间自适应OFDM通信机制;提出了利用代价函数计算传输模式切换阈值的方法。仿真显示所设计的自适应OFDM系统具有良好的链路适应能力,可以得到优化的系统频带利用率和平均误码率性能。
In order to design a wireless link adaptive transmission technology with strong channel error correction ability and high system frequency band utilization, an adaptive coding and modulation OFDM system model based on LDPC channel error correction code and corresponding transmission scheme are studied in this paper. Four intervals Adaptive OFDM communication mechanism; proposed using cost function to calculate the transmission mode switching threshold. The simulation shows that the designed adaptive OFDM system has good link adaptability and can get optimized system bandwidth utilization and average bit error rate performance.