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为合理利用WiMAX系统PMP(Point to Multi-Point)网络的无线资源,提出一种自适应ROHC(Robust Header Compres-sion)压缩算法.算法首先基于状态划分无线信道,然后结合解压缩端反馈的信噪比SNR,利用压缩端当前采用的调制方式计算BER,判断当前信道所处状态,最后根据鲁棒性和压缩率,调整W-LSB编码时的合适窗口大小,实现自适应压缩的目的.仿真结果表明,提出的算法在压缩性能和鲁棒性能上达到了满意的效果.
In order to utilize the wireless resources of PMP (Point to Multi-Point) network of WiMAX system reasonably, an adaptive ROHC (Robust Header Compression) compression algorithm is proposed.At first, the algorithm divides the wireless channel based on the state and then combines the feedback signal Noise ratio (SNR), the current BER is used to calculate the BER and the current channel status is determined. Finally, according to the robustness and compression rate, the appropriate window size for W-LSB coding is adjusted to achieve the purpose of adaptive compression. The results show that the proposed algorithm achieves satisfactory results in terms of compression performance and robustness.