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针对多径衰落信道提出了一种基于小波变换并结合OFDM(Orthogonal Fre-quency Division Multiplexing)自适应调制的图像传输方法和信源信道联合带宽功率优化分配算法.给出了编码传输方法结构,对有噪信道下基于小波变换的图像编码传输实现和失真估计问题及多误码率OFDM自适应调制比特功率优化分配问题进行了建模和分析,使得信源量化编码与OFDM调制能够方便地结合起来,并进一步得到了相应的信源信道联合优化带宽功率分配方法.仿真和分析表明,该方法实现了多径信道下图像的信源信道联合编码调制传输,编解码复杂度和延迟小,且信源信道联合优化的带宽功率分配可有效提高信道资源利用效率.
Aiming at the multipath fading channel, an image transmission method based on wavelet transform and OFDM (Orthogonal Fre-quency Division Multiplexing) adaptive modulation and a joint bandwidth power optimization allocation algorithm of source channel are proposed. The structure of coding transmission method is given, Wavelet transform based image coding and transmission implementation and distortion estimation problem and multi-bit error rate OFDM adaptive modulation bit power optimization assignment problem under noisy channel are modeled and analyzed, so source coding and OFDM modulation can be conveniently combined , And the corresponding joint optimization of bandwidth allocation for source channels is also obtained.The simulation and analysis show that this method achieves joint encoding and modulation of source channels in multipath channels with low complexity of coding and decoding and low latency The joint optimization of bandwidth allocation of source channels can effectively improve the channel resource utilization efficiency.